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A general overview of worldwide valve industry in 2012

6/30/2012

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A general overview of worldwide valve industry in 2012

Valve is widely used in all major aspects of the national economy, energy, petrochemical, metallurgy, electric power and other industries. It is one of the key equipment in the equipment of machinery, pipelines and other fixed assets. Therefore, the development of valve industry is relative with macroeconomic cycles as well as investment in fixed assets.

Since 2000, the global economy steadily recovering since the trough, according to IMF statistics, in 2001-2007 the average annual global GDP growth of 4.04 percent average, annual global investment in fixed assets grew by 3.72 percent. European industry forecast (European Industry Forecast Limited) "global valve market :2008-2013," Statistics, the compound annual growth rate of the finished valve sales revenue in the global economic up-cycle in 2002 and 2007 was 5.60%, to maintain steady growth of development.

In 2008, the financial crisis began in earnest in the United States rapidly sweeping the globe, including Europe, North America, including the major economies are affected, global GDP growth rate dropped from 5.15% in 2007 to 3.2% in 2008 and 2009 -1.32%. The rapid cooling of the global economy, investment in fixed assets of the valve downstream industry had a certain negative impact, oil and gas, power, chemical and other industries have emerged to postpone the implementation of the phenomenon of fixed assets investment projects, the sound development of steady growth in the valve industry The momentum had a negative impact. According to market research company McIlvaine, the global valve industry in 2009 revenues of $ 47.436 billion, a growth rate of only 0.56%.

The medium to long term, the main factors affecting the valve industry, the expansion of downstream industries, including the growing energy demand, the continued increase in global population and urbanization in developing countries, the process of industrialization and did not change fundamentally the result of the financial crisis. The world's major economies have entered the economic recovery cycle (according to IMF statistics and forecasts, 2010 and 2011 global economic growth have resumed their growth, the growth rates were 5.2% and 3.8% in 2012 - 2013 global economic growth rate is expected to remain above 3%). Valve industry since 2010, began to recover, according to a the McIlvaine survey and forecast data, 2010 and 2011, global valve industry revenues were $ 49,230,000,000 and $ 51,066,000,000, the growth rate back to 3.78% and 3.73% 2012 -2015 global valve industry expected sales growth will reach 4.16% and 3.93%, 3.94% and 4.18%, showing a steady upward growth.

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API 609 Butterfly Valve drawing for reference

6/28/2012

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Please download our the below valve drawing for reference. It is metal hard seal, three eccentric design butterfly valve, available double flange, wafer type and lug type, as well as butt welded ends. It is just for technical evaluation if you have are interested in this products. Our design allows reduced torques and excellent throttling capabilities of the offset disc assemblies. The metal-metal seal assures a perfect tightness even at pressure and/ or temperature & pressure changes.

Materials: carbon steel WCB, LCB, LCC, LC1, LC3, stainless steel CF8, CF8M, CF3, CF3M, duplex steel 1A(CD4MCu) 2A(CE8MN) 3A(CD6MN) 4A(CD3MN) 5A(CE3MN) and aluminium bronze etc.
Size range: DN50 to DN3000, 2" to 120" nominal diameter.
Design standards: API 609, EN593, MSS SP-67, MSS SP-68, GB/T12238 etc
Face to Face dimensions: DIN3202-K1, EN558-1 20 Series, BS5155, MSS SP-67 etc
Design pressure: Pressure Rating ANSI Class 150#, Class 300#, Class 600#.
Working temperature:-29 ºC to + 425ºC, Special materials can be from -196°C to + 600°C.
End flange dimension: ASME B16.5 (for NPS not more than 24"), ASME B16.47 series B, API 605, ASME B16.47 series A (for NPS> 24"), or BS EN 1092.
Operation: lever, worm gear, pneumatic, electric, hydraulic or pneumatic-hydraulic actuator.
Charateristic: longer service life and available high temperature and pressure.
Application: is widely used in oil refining, chemical machinery industries, chemical and petrochemical processing, water pipeline system etc.
1. API 609 Triple Offset Butterfly Valve Drawing Flanged 150LB DN100~DN600
2. API 609 Triple Offset Butterfly Valve Drawing Flanged 150LB DN700~DN1500
3. API 609 Triple Offset Butterfly Valve Drawing Wafer 150LB DN100~DN600
4. API 609 Triple Offset Butterfly Valve Drawing Wafer 150LB DN700~DN1500
5. API 609 Triple Offset Butterfly Valve Drawing Lug 150LB DN100~DN600
6. API 609 Triple Offset Butterfly Valve Drawing Lug 150LB DN700~DN1500

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An Overview of D343H and D373H butterfly valve

6/25/2012

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图片
D343H butterfly valve is wormgear operated, double flange, three eccentric (triple offset) metal seal structure butterfly valve. The seal is in the form of metal to metal, metal seals can be composited stainless steel and graphite combined sealing. It can be available manual, electric, pneumatic, hydraulic actuators etc.
D373H butterfly valve is wormgear operated, wafer type, three eccentric (triple offset) metal seal structure butterfly valve. The seal is in the form of metal to metal, metal seals can be composited stainless steel and graphite combined sealing. It can also be available manual, electric, pneumatic, hydraulic actuators etc.
And please pay attention to the flow questions for D343H butterfly valve and D373H butterfly valve when the valves are working in project:
1, We know the sealing ring are graphite and stainless steel SS304 composited material that is fixed in the valve disc. The disc is normally open status, the media will crash the sealing surface at the front erosion of seal ring, this will affect the sealing performance.
2. the structural limit, usually it is not suggested for below diameter DN200 valve, because the overall structure of the disc is too thick and the flow resistance is large.
3. Due to the principle of eccentric structure, the sealing surface of the valve plate and valve seat seal on the transmission of torque to the valve plate pressure to the valve seat. When it is in right flow status, the pressure is higher, the sealing is tigher. But when it is in reverse flow medium with media pressure, the seal may start to leak when the reverse pressure is back to the disc. So some customers ask us to design it bi-directional seal for triple offset butterfly valve. Usually it is single direction seal if not requested by customer.
 D343H butterfly valve and D373H butterfly valve is widely used in water supply system, foodstuff, beverage, pharmaceutics, boiler, oil refining, chemical machinery industries, chemical and petrochemical processing, power generating plants, pulp and paper manufacturing processing, desalination, steelmaking, coal and mining industries. Size range from 2" to 120", pressure range from Class 150Lbs to Class 600Lbs.

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Chinese Valve Standards

6/24/2012

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Chinese Valve Standards - Chinese standards for steel, cast iron and metal valves

GB12220: General valve - marking

GB12221: Flanged ends metal valve - face-to-face dimensions

GB12222: Multi-turn valve - connection of driving device

GB12223: Part-turn valve - connection of driving device

GB12224: Steel valve - general requirements

GB12225: General valve - copper alloy casting ware technology requirements

GB12226: General valve - gray casting iron technology requirements

GB12227: General valve - ductile casting iron technology requirements

GB12228: General valve - carbon forging steel technology requirements

GB12229: General valve - carbon casting steel technology requirements

GB12230: General valve - a casting steel technology requirements

GB12232: General valve - flanged ends iron gate valve

GB12233: General valve - iron gate valve and lift check valve

GB12234: General valve - flanged and butt-welding ends copper gate valve

GB12235: General valve - flanged steel stop and lift check valve

GB12236: General valve - steel swing check valve

GB12237: General valve - flanged and butt-welding ends steel ball valve

GB12238: General valve - flanged and wafer ends butterfly valve

GB12239: General valve - diaphragm valve

GB12240: General valve - iron plug valve

GB12241: Safety valve - general requirements

GB12242: Safety valve - characteristic testing solution

GB12243: Direct spring loaded safety valve

GB12244: Pressure reducing valve - general requirements

GB12245: Pressure reducing valve - characteristic testing solution

GB12246: Pilot operated pressure reducing valve

GB12247: Steam trap valve - classification

GB12248: Steam trap valve - technology terms

GB12249: Steam trap valve - marking

GB12250: Steam trap valve - face-to-face dimensions

GB12251: Steam trap valve - testing solution

GB/T1392: General valve - pressure testing

GB/T13932: General valve - iron swing check valve

GB/T15185: Iron and copper ball valve

GB/T15188.1: Valve face-to-face dimensions - butt-welding ends valve

GB/T15188.2: Valve face-to-face dimensions - wafer ends valve

GB/T15188.3: Valve face-to-face dimensions - female screw-down valve

GB/T15188.4: Valve face-to-face dimensions - male screw -down valve

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BS Valve Standards

6/24/2012

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BS Valve Standards

An overview of British Standard - BS - valve standards

BS 1212: Ball valves (Portsmouth type ) excluding floats

BS 1123: Specification for safety valves, gauges and other safety fittings for air receivers and compressed air installations

BS 1414: Specification for steel edge gate valves ( flanged and butt- welding ends ) for the petroleum, petrochemical and allied industries

BS 1552: Control plug cocks for low - pressure gases

BS 1570: Specification for Flanged and Butt - welding ends steel plug valves for the petroleum industry (excluding well - Head and flow - line valves)

BS 1735: Specification for Flanged cast iron outside - screw - and - yoke edge gate valves class 125, size 1.5 in to 24 in for the petroleum industry

BS 1868: Specification for steel check valves (flanged and butt-welding ends ) for the petroleum, petrochemical and allied industries

BS 1873: Specification for Steel globe and globe stop and check valves (flanged and butt-welding ends ) for the petroleum, petrochemical and allied industries

BS 1952: Specification for copper alloy gate valves for general purposes

BS 1953: Copper alloy check valves for general purposes

BS 1968: Floats for Ball valves ( copper )

BS 2060: Copper alloy screw - down stop valves for general purposes

BS 2080: Specification for Face - to - face, centre - to - face end - to -end and centre - to - end dimensions of flanged and butt-welding ends steel valves for the petroleum, petrochemical and allied industries

BS 2591 PT.1: British standard glossary for valves and valve parts (for fluids ) part 1.screw - down stop ,check and gate valves

BS 2591 PT.2: British standard glossary for valves and valves parts ( for fluids) part,2 safety valves and relief valves

BS 2591PT.3: British standard glossary for valves and valve parts (for fluids ) part 3, Plug valves and cocks

BS 2591PT.4: British standard glossary for valves and valves (for fluids ) part4, butterfly valves

BS 2591PT.5: British standard glossary for valves and valve parts ( for fluids ) part5, Ball valves

BS 2995: Specification for cast and forged steel wedge gate, glove, check and plug valves screwed and socket - Welding sizes 2 in and smaller for the petroleum industry

BS 3464: Specification for cast iron gate valves for general purposes

BS 3808: Specification for cast and forged steel flanged, screwed and socket - welding Wedge gate valves (compact design ) sizes 2 in and smaller for the petroleum industry

BS 3948: Specification for cast iron parallel slide valves for general purposes

BS 3952: Specification for cast iron butterfly valves for general purposes

BS 3961: Specification for cast iron screw - down stop valves and stop and check valves for general purposes

BS 4090: Cast Iron check valves for general purposes

BS 4133: Flanged steel parallel slide valves for general purposes

BS 4312: Flanged steel screw - down stop valves and stop and check valves for general purposes

BS 4460: Steel Ball valves for the petroleum industry

BS 5146: Specification for inspection and test of steel valves for the petroleum petrochemical and allied industries

BS 5150: Cast iron wedge and double disk gate valves for general purposes

BS 5151: Cast iron gate (parallel slide ) valves for general purposes

BS 5152: Cast iron globe and globe stop and check valves for general purposes

BS 5153: Cast Iron check valves for general purposes

BS 5154: Copper alloy globe stop and check, check and gate valves for general purposes

BS 5155: Cast iron and carbon steel butterfly valves for general purposes

BS 5156: Screw down diaphragm valves for general purposes

BS 5157: Steel gate (parallel slide ) valves for general purposes

BS 5159: Specification for cast iron and carbon steel ball valves for general purposes

BS 5160: Specification for Flanged steel globe valves, globe stop and check valves and lift type check valves for general purposes

BS 5351: Steel ball valves for the petroleum petrochemicals and allied industries

BS 5417: Test of genera purpose industrial valves

BS 5418: Marking of general purpose industrial valves

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ASME Valve Standards

6/24/2012

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ASME Valve Standards

An overview of The American Society of Mechanical Engineers - ASME - valve standards

ASME A105/105M: Standard Specification for Carbon Steel Forgings for piping applications

ASME A181/181M: Standard Specification for Carbon Steel Forgings for General purpose piping

ASME A182/182M: Standard Specification for forged or rolled alloy-steel pipe flanges, forged fittings and valves and parts for high-temperature service

ASME A727/727M: Standard specification for carbon steel forgings for piping components with inherent notch toughness.

ASME A961: Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, valves, and Parts for Piping Applications

ASME B462: Standard Specification for Forged or Rolled UNS N08020, UNS N08024, UNS N08026, UNS N08367, and UNS R20033 Alloy Pipe Flanges, Forged Fittings, and Valves and Parts for Corrosive High-Temperature Service

ASME B834: Standard Specification for Pressure Consolidated Powder Metallurgy Iron-Nickel- Chromium-Molybdenum (UNS N08367) and Nickel- Chromium Molybdenum Columbium (Nb) (UNS N06625) Alloy Pipe Flanges, Fittings, Valves, and Parts

ASME D5500: Standard Test Method for Vehicle Evaluation of Unleaded Automotive Spark-ignition Engine Fuel for Intake Valve Deposit Formation

ASME F885: Standard Specification for Envelope Dimensions for Bronze Globe Valves NPS 1/4 to 2 El-1996 R(1996)

ASME F992: Standard Specification for Valve Label Plates El-1997 R(1997)

ASME F993: Standard Specification for Valve Locking Devices El-1997 R(1997)

ASME F1020: Standard Specification for Line-Blind Valves for marine Applications El-1996 RI'1996)

ASME F1098: Standard Specification for Envelope Dimensions for Butterfly Valves - NPS 2 to 24 EI-1993 R(1993)

ASME F1271: Standard Specification for Spill Valves for Use in Marine Tank Liquid Overpressure Protections Applications EI-1995 R (1995)

ASME F1370: Standard Specification for Pressure Reducing valves for Water Systems, Shipboard

ASME F1508: Standard Specification for Angle Style, Pressure Relief Valves for Steam, Gas, and Liquid Services

ASME F1565: Standard Specification for Pressure-Reducing Valves for Steam Service

ASME F1792: Standard Specification for Special Requirements for Valves Used in Gaseous Oxygen Service

ASME F1793: Standard Specification for Automatic Shut-Off Valves (Also Known as Excess Flow Valves, EFV) for Air or Nitrogen Service

ASME F1794: Standard Specification for Hand operated, Globe-Style Valves for Gas (Except Oxygen Gas), and Hydraulic Systems

ASME F1795: standard Specification for Pressure-Reducing Valves for Air or Nitrogen Systems

ASME A230: Standard specification for steel wire oil - tempered carbon valve spring quality

ASME A232: Standard specification for chromium - vanadium alloy steel valve spring quality

ASME A350: Standard specification for forged or rolled carbon and alloy steel flanges forged fittings and valves and parts for low - temperature service

ASME A338: Standard specification for ultrasonic examination of heavy steel forgings

ASME A694: Standard specification for forgings carbon and alloy steel for pipe flanges fittings valves and parts for high - pressure transmission service

ASME A404: Standards specification for forged or rolled alloy - steel pipe flanges forged fittings and valves and parts specially heat treated for high temperature service

ASME A522: Forged or rolled 8% and 9% nickel alloy steel flanges fittings valves and parts for low - temperature service

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ANSI & API Valve Standards

6/24/2012

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ANSI & API Valve Standards

An overview of American National Standards Institute - ANSI - and American Petroleum Institute - API valve standards

ANSI A126: Grey iron castings for valves flanges and pipe fittings

ANSI A181: Standard specifications for forged or rolled steel pipe flanged forged fittings and valves and parts for general service

ANSI B16.10: Face - to - face and end - to - end dimension of ferrous valves

ANSI B16.5: flange dimension for 24" and below, pressure class 150Lbs to Class 2500Lbs.

ANSI B16.47: flange dimension for above 24", pressure class 150Lbs to Class 2500Lbs.

ANSI B16.34: Steel valves

ANSI B127.1: Constant - level oil valvess

API SPEC6D: Supplement 1 to api spec 6D (sixteenth edition ) specification for pipeline valves

API STD6D: Steel gate plug ball and check valves for pipeline service

API STD6D: API Specification for flanged steel gate and plug valves for drilling and production service

API SPE14D: API Specification for wellhead surface safety valves for offshore service

API 526: Flanged steel safety relief valves

API 527: Commercial seat tightness of safety relief valves with metal - to metal seats

API 528: API standard for safety relief valve nameplate nomenclature

API 529: Cast - forged Steel plug valves flanged ends

API 594: Wafer - type check valves

API 595: Cast - iron gate valves flanged ends

API 597: Steel venturi gate valves flanged or butt welding ends

API 598: Valve inspection and test

API 599: Steel plug valves flanged or butt welding ends

API 600: Flanged and butt - welding - end steel gate and plug valves for refinery use

API 602: Compact design carbon steel gate valves for refinery use

API 603: 150 - pound light - wall corrosion - resistant gate valves for refinery use

API 604: Ductile iron gate valves flanged ends

API 607: Fire - resistant testing of ball valves with soft contact faces

API 609: Butterfly valves to 150 psig and 150 F

API SPEC 6FA: Specification for fire test for valves

API SPEC 6FC: Specification for fire test for valves with automatic backseats

API BULL 6RS: Bulletin on referenced standards for committee 6, standardization of valves and wellhead equipment

API RP 11V6: Recommended practice for design of continuous flow gas lift installations using injection pressure operated valves first edition

API RP 11V7: Recommended practice for repair , testing, and setting gas lift valves

API RP 520 PT 1: Sizing, selection and installation of pressure relieving devices in refineries part 1- sizing and selection

API RP 574: Inspection of piping, tubing, valves and fittings first edition, replaces guide for inspection of refinery equipment Chapter XI

API RP 576: Inspection of pressure-relieving devices first edition

API STD 608: Metal ball valves-flanged, threaded and welding end

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An overview of DIN valve standards

6/24/2012

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An overview of DIN - Deutsches Institut für Normung - valve standards

·         DIN - Deutsches Institut für Normung - valve related standards: DIN 475-1:
Widths across flats for bolts, screws, valves and fittings

·         DIN 475-2: Wrench and socket openings

·         DIN 477-1: Gas cylinder valves rated for test pressures up to 300 bar; types, sizes and outlets

·         DIN 477-4: Compressed gas cylinder valves; swing check valves for camping-cylinders

·         DIN 477-5: Gas cylinder valves - Part 5: For test pressure up to 450 bar max.; Outlet connections

·         DIN 477-6: Gas cylinder valves; test pressures 300 bar and 450 bar, with cylindrical thread for valve stem and gas cylinder neck for breathing apparatus; sizes, threads

·         DIN 477-9 (Draft standard): Gas cylinder valves, for highest grade gases; sizes, connections, threads

·         DIN 1690-10: Technical delivery conditions for castings of metallic materials; supplementary requirements for steel castings used for heavy-duty valves

·         DIN 3202-4: Face-to-face and center-to-face dimensions of valves; Valves with female thread connection

·         DIN 3202-5: Face-to-face and center-to-face dimensions of valves; valves for connection with compression couplings

·         DIN 3230-3: Technical delivery conditions for valves; Compilation of test methods

·         DIN 3230-4: Technical Conditions of Delivery for Valves; Valves for Potable Water Service, Requirements and Testing

·         DIN 3230-5: Technical delivery conditions; valves for gas installations and gas pipelines; requirements and testing

·         DIN 3230-6: Technical delivery conditions for valves; requirements and methods of test for valves for use with flammable liquids

·         DIN 3266-1: Valves for drinking water installations on private premises; PN 10 pipe interrupters, pipe disconnectors, anti-vacuum valves

·         DIN 3266-2: Valves for drinking water installations on private premises; PN 10 pipe interrupters, pipe disconnectors, anti-vacuum valves; testing

·         DIN 3320-1: Safety valves; safety shut-off valves; definitions, sizing, marking

·         DIN 3320-3 (Draft standard): Safety valves; safety shut-off valves; center for face dimensions of flanged safety valves to PN 40 and to DN 250 inlet

·         DIN 3339: Valves; body component materials

·         DIN 3352-1: Gate Valves; General Information

·         DIN 3352-2: Cast iron gate valv: es, with metallic seat and inside screw stem

·         DIN 3352-3: Cast iron gate valves, with metallic seat and outside screw stem

·         DIN 3352-4: Cast iron gate valves with elastomeric obturator seatings and inside screw stem

·         DIN 3352-5: Steel gate valves, isomorphs series

·         DIN 3352-13: Double-socket cast iron gate valves, with elastomeric obturator seat and inside screw stem

·         DIN 3356-1: Globe valves; General data

·         DIN 3356-2: Globe valves; Cast iron stop valves

·         DIN 3356-3: Globe valves; Unalloyed steel stop valves

·         DIN 3356-4: Globe valves; High temperature steel stop valves

·         DIN 3356-5: Globe valves; Stainless steel stop valves

·         DIN 3357-1: Metal ball valves; general requirements and methods of test

·         DIN 3357-2: Full bore steel ball valves

·         DIN 3357-3: Reduced bore steel ball valves

·         DIN 3357-4: Full bore nonferrous metal ball valves

·         DIN 3357-5: Reduced bore nonferrous metal ball valves

·         DIN 3381: Safety devices for gas supply installations operating at working pressures up to 100 bar; pressure relief governors and safety shut-off devices

·         DIN 3399: Gas low-pressure cut-off valves; safety requirements, testing

·         DIN 3441-1: Unplasticized polyvinyl chloride (PVC-U) valves; requirements and testing

·         DIN 3441-2: Unplasticized polyvinyl chloride (PVC-U) valves; ball valves; dimensions

·         DIN 3441-3: Unplasticized polyvinyl chloride (PVC-U) valves; diaphragm valves; dimensions

·         DIN 3441-4: Valves of Rigid PVC (Unplasticized or Rigid Polyvinyl Chloride); Y-valves (Inclined-seat Valves), Dimensions

·         DIN 3441-5: Unplasticized polyvinyl chloride (PVC-U) valves; PN 6 and PN 10 wafer type butterfly valves; dimensions

·         DIN 3441-6: Unplasticized polyvinyl chloride (UPVC) valves; gate valves with inside screw stem; dimensions

·         DIN 3442-1: Polypropylene (PP) valves; requirements and testing

·         DIN 3442-2: Fittings of PP (Polypropylene); Ball valves, Dimensions

·         DIN 3442-3: Polypropylene (PP) valves; diaphragm valves; dimensions

·         DIN 3475: Spheroidal graphite cast iron valves and fittings provided with internal corrosion protection by means of enamelling, for use in drinking water supply systems; requirements and testing

·         DIN 3476: Corrosion protection of water valves and pipe fittings by epoxy powder or liquid epoxy resin linings - Requirements and testing

·         DIN 3500: PN 10 piston type gate valves for use in drinking water supply systems

·         DIN 3502: Stopvalves for drinking water supplies on and in private property; straight pattern globe valves with oblique bonnet, rated for nominal pressure PN 10

·         DIN 3512: Stopvalves for domestic water supply - Two-way valves - Vertical bonnet type PN 10; Straight pattern globe valve; Technical rule of the DVGW

·         DIN 3535-1: Sealants for gas supplies; elastomeric gasket materials for gas valves in domestic installations; requirements and tests

·         DIN 3535-5: Rubber/cork and rubber/cork synthetic fiber based gasket materials for use with gas valves, gas appliances and gas pipe work

·         DIN 3535-6: Gaskets for gas supply - Part 6: Gasket materials based on synthetic fibers, graphite or polytetrafluoroethylen (PTFE) for gas valves, gas appliances and gas mains

·         DIN 3537-1: Gas stop valves rated for pressures up to 4 bar; requirements and acceptance testing

·         DIN 3543-1: Metal tapping valves; requirements, testing

·         DIN 3543-2: Metallic tapping stop valves; dimensions

·         DIN 3543-3, Publication date: 1978-07
PVC tapping valves for plastic pipes; dimensions

·         DIN 3543-4: High density polyethylene (HDPE) tapping valves for HDPE pipes; dimensions

·         DIN 3544-1: High-density polyethylene (HDPE) valves; tapping valves; requirements and test

·         DIN 3852-1: Ports and stud ends with metric fine pitch thread, for use with compression couplings, valves and screw plugs; Dimensions

·         DIN 3852-2: Stud ends and tapped holes with pipe thread, for use with compression couplings, valves and screw plugs; Dimensions

·         DIN 3852-11: Stud ends and tapped holes for use with compression couplings, valves and screw plugs - Type E stud end dimensions

·         DIN 19208: Flow measurement; mating dimensions and application of shut-off valves for differential pressure transducers and differential pressure piping

·         DIN 19578-1: Stop valves for site drainage systems; anti-flooding valves for faucal sewage systems; requirements

·         DIN 20042: Water valve, nominal pressure 40 - Dimensions and requirements

·         DIN EN 28233: Thermoplastics valves; torques; test method (ISO 8233: 1988)

·         DIN 30677-1: Corrosion protection of buried valves; coating for normal requirement

·         DIN 30677-2: External corrosion protection of buried valves; heavy-duty thermoset plastics coatings

·         DIN 32509: Hand-operated shut-off valves for welding, cutting and allied processes - Type of construction, safety requirements, tests

·         DIN 42560: Transformers; Throttle-valves NW 80, Dimensions, Tightness Testing

·         DIN 74279: Air braking systems - Charging valves

·         DIN 86251: Shut off valves for shipboard use, of cast iron, with flanges, DN 15 to 500

·         DIN 86252: Non return valves for shipboard use, cut off type, of cast iron, with flanges, DN 15 to 500

·         DIN 86260: Shut off valves for shipboard use, of gun metal, with flanges, DN 15 to 500

·         DIN 86261: Non return valves for shipboard use, cut off type, of gun metal, with flanges, DN 15 to 500

·         DIN 86501: Valves, screwed bonnet type of gun metal with 24�-connection with port end W according to DIN 3861

·         DIN 86528: Tab washers for screwed bonnet valves

·         DIN 86552: Valves, screwed bonnet type of steel with 24�-connection with port end W according to DIN 3861

·         DIN 86720: Gate valves flat sided of gun metal with screwed bonnet and flanges, DN 20 to DN 100, PN 16

·         DIN 87101, Publication date: 2003-10: Non-return flaps (storm valves), self-closing, vertical type, DN 50 up to DN 150, PN 1 - Mating dimensions for flanges according to PN 10

·         DIN 87901: Sniffle valves for pumps

·         DIN EN 488: District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene; German version EN 488: 2003

·         DIN EN 558-1: Face-to-face and center-to-face dimensions of metal industrial valves for use in flanged pipe systems - PN designated valves

·         DIN EN 558-2: Face-to-face and center-to-face dimensions of metal industrial valves for use in flanged pipe systems - Class-designated valves

·         DIN EN 736-1: Valves - Terminology - Types of valves

·         DIN EN 736-2: Valves - Terminology - Part 2: Definition of components of valves

·         DIN EN 736-3: Valves - Terminology - Part 3: Definition of terms (includes Amendment A1: 2001); English version of DIN EN 736-3: 1999 + A1: 2001

·         DIN EN 917: Plastics piping systems - Thermoplastics valves - Test methods for resistance to internal pressure and leak-tightness

·         DIN EN 1092-1: Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories - Part 1: Steel flanges, PN designated

·         DIN EN 1092-2: Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 2: Cast iron flanges

·         DIN EN 1092-4: Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 4: Aluminium alloy flanges

·         DIN EN 1680: Plastics piping systems - Valves for polyethylene (PE) piping systems - Test method for leaktightness under and after bending applied to the operating mechanism

·         DIN EN 1705: Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after an external blow; German version EN 1705: 1996

·         DIN EN 28233: Thermoplastics valves; torques; test method (ISO 8233: 1988)

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Leakage analysis for electric operated valve

6/23/2012

2 Comments

 
Nowdays, the electric valve has been widely used in power plants, petrochemical, iron and steel metallurgy, food processing and water treatment industries, especially for large enterprises that need to automatic control. Electric valve has create the condition of remote control for the valve so that the automation and intelligent of production systems become possible. However, the electric valves in system often can not shut down tightly in operation. It has made a lot of trouble for valve user and operator, seriously affected the valve life.

Wedge gate valve, globe valve and butterfly valve, they are to reply on the operational force on the sealing surface to ensure sealing. And the sealing surface than the pressure is to rely on the valve operating torque can reach this. This kind of valve is to be operated by torque control. In actual practice, it may often cause the leakage when it is closed by electric. So for this aspect, it need to manually close the valve. In case of unforeseen circumstances, in order to ensure that the valve closed tightly, usually we need to use a long rod to force for closing it. This operating condition neither achieve the remote control and system automation, but also increased the operator's labor intensity and shorten the service life of valve. Because the valve is not closed tight, the medium of leakage will wash off the sealing surface in high-speed, it must be a apid damage of it. If we close the valve with a long rod, we can not control the torque and inevitably damage the sealing surface, such as high temperature electric gate valve and motorized triple offset butterfly valve etc. We can also call electric valve or motorized valve. It is the same type.

The electric valve can not close tightly, and people can manually shutting the valve. Obviously the problem is subject to the control system of electrical device.

At present, the electric valve is usually equipped with stroke control and torque control two sets of systems, it is built to travel for the control, and torque for the protection. For the stroke control valve, normal working hours, to travel to control valve fully open and fully closed position. If the travel is out of control, we need to use the manual torque protection for its operation which can be maintained to avoid valve damage. In order to ensure the safety valves and production systems. Torque control valve in the existing system, travel system can not afford protection role. Torque control failure or values ​​change, the valve operating torque will be increased rapidly in an instant, but no other protective measures. Therefore, this control system is not complete.

Even with the applicable control system, after the electric device and the valve assembly, is also accurate debugging and setting the control parameters. Generally, the electrical device at the factory, the rated output torque has been completed calibration. After calibration of torque, however, only indicates that the work capacity of electrical device, the torque is not the same as the valve closes. The valve closes the required torque in addition to the valve specification model, the actual work with the valve media, pressure and temperature, the user should re-adjustment and setting. However, most of valve users (including valve manufacturer) do not have the torque detection means, and can not be set torque value. And valve operation for some time after repair, the torque of electric device factory settings have been changed must be re-set. The case of lack of torque determination means, the valve user can only be adjusted in accordance with the valve fully open and fully closed position the valve opening direction, and set in the fully open and fully closed position limit switch action to ensure that the travel control can work properly. Then, the valve is closed, the trip off switch action based on, manual off valve, feel close torque increased to a certain range, adjust the action of torque switch. This set of results must be the valve opening and closing is still subject to the control of limit switch. The closing toruqe of valve can not be guaranteed, so the tightness of sealing is difficult to guarantee.

In many companies, valves and electrical installations are belong to two departments for managemen. Valve owned by the equipment sector management, and electric installations owned by the instrument sector management. Electric devices typically meter department responsible for adjusting the settings. Instrumentation sector natural focus in the control system work properly, as long as the stroke control adjustment, and automatic control of whole system will be able to work properly. As for the work to ensure that the valve closing moments do not get enough attention, often electric valve operation after the closure of leakage is simply regarded as the poor quality of valve. In fact, the electric valve closure is not tight and is caused by a variety of factors, both technical reasons, also organized management reasons. Only by taking a realistic and practical approach, one by one to solve these problems, in order to ensure that the valve performance.

In order to ensure the reliability of electric valve operation, valve commissioning training should be strengthened so that they can correctly grasp the reasonable debugging method for all kinds of valves. So that the electric valve closure tightness in the electric operation will be radically improved. The valve itself is good quality, the reliability of valve will be improved, and will also be welcomed by users.

2 Comments

What is the meaning of D71X, D371X, D41X, D341X valve codes? 

6/22/2012

0 Comments

 
These valve codes are written according to JB/T 308 standard for Valve Model Designation Method.

D71X means the valve type is butterfly valve, wafer connection, concentric type, rubber sealing, D371X means gear operated wafer type concentric rubber seal butterfly valve, D41X means flange type concentric rubber seal butterfly valve. D341X means gear operated flange type concentric rubber seal butterfly valve. These codes are chinese valve codes and popular to understand by us.

D71X, D371X, D41X, D341X are concentric design with rubber seal, such as EPDM or NBR seal or full lined. This products are extensively used for water supply industry etc.

Welcome to use D71X, D371X, D41X, D341X at your project and we offer 18 months quality warranty after delivery..
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