Classification of gate valves
Gate valve have more types. There are wedge gate valve, flat gate valve, single wedge gate valve, double disc gate valve , no rising stem gate valve and rising tem gate valve and knife gate valve and resilient seat seal gate valve and forged gate valves.
The wedge gate valves is Conventional valves, materials include WCB,LCB,CF8,CF8M,CF3,CF3M,WC6 and WC9.It usually used in water ,gas and oil.Different materials used for different mediums.
The flat gate valves are usually used in Oil,and are more expensive than other gate valves.The sealing have two types like meatal to meatal and soft sealig.There are diversion holes and without diversion holes.
The knife gate valve is the simplest gate valve and are used in mud and pulp .But this type of gate valves can used in high pressure high pressure environment. the pressure is only under PN25.
The forged gate valve is domestic high quality valve i, but its size is only DN50 below, the material has A105,LF2,F304,F316, connecting SW,BW,flange, this forged gate valve is usually used in high pressure environment.