The valve, commonly utilized in water supply system, includes gate valve , globe valve , check valve, butterfly valve, etc.
Gate valve: Gate valve has small fluid resistance, small force. It allows fluid to flow in any directions. But gate valve has complicated structure. Sealing face of gate valve is easily polished by impurities or particles in water. When gate valve is usually opened, the disc may fall off, result system losing control.
Globe valve: Compared with gate valve, gate valve has simple structure, good sealing, and convenient maintenance. However, the force is larger than gate valve.
Butterfly valve: Butterfly valve can be opened or closed completely. Butterfly valve has small volume, light weight though it has large force.
Check valve: It is mainly used to avoid back flow.Commonly utilized check valve is lift check valve and swing check valve.