To use adjusting valve when you are alone and depressed; To use control valve if you are pleased with pride; To use check valve if you are discouraged with regret; To use through conduit gate valve if you are exciting; To use pressure reducing valve if you are under a lot of pressure; To use butterfly valve if your space is little; To use three way valve for human relationship; To use trap valves if the difficulties and resistance are large; To use cut-off valve if the stock price is low; To use needle valve for sewing; To use power station valve for electricity of lifes; To use drain valve for sweeping; To use water control valves for water washing and drinking; To use discharge valve for spicy hot pot; To use plug valve if your emotion leaks; To use balance valve if you obtain results; To use gate valve if you feel suffering; To use diaphragm valve if you are surrounded by temptations; The most important part is to install a safety valve; Just choose what you need, do not choose the cheap and expensive; The valves achieve your life!