The advantages and disadvantages of gate valve

Gate valve is closed ( Ram) Along the pathway of the center line of the vertical direction of the valve. Gate valve is a valve, use a wide range of average diameter (cutting device to choose it, sometimes diameter small cutting device also chooses gate valves. Gate valves are used as a cut-off media, through the entire circulation when fully open, small pressure loss of the medium run and now. Gate valves are normally applied to don't need to often open/close, and keep the gate full open or full close condition, is not suitable for use as regulating or throttling.


the advantages of gate valves:


1. Gate valve body internal media channel is straight, don't change the direction of flow medium flows through the gate, so the fluid resistance is small.


2. Gate valve opening and closing the gate direction perpendicular to flow direction of medium, compared with the cut-off valve, gate valve opening and closing of the effort.
3。 More suitable for the medium may change the direction of current flow in pipeline.
4。 Gate valve gate is vertically placed in the body, thus structure length is short.
5。 Fully open sealed performance is good sealing surface erosion by working medium is smaller.
6。 Gate opening and closing of the trip is bigger, is through the screw lift. Open/close time is long, water hammer is not easy to produce.
7。 Compact structure, the valve rigidity, smooth channel, small number of flow resistance, sealing surface of stainless steel and carbide, long service life, using PTFE packing, reliable seal, flexible operation of the light.


8. Shorter form, simple structure, good manufacturing technology, wide application scope.


gate drawback:


1. Disc and seat sealing surface is easy to damage, opening and closing on the contact between the seal and have relative friction, easy to damage, can affect the seals and the service life, maintenance is difficult.


2. When the height of the opening and closing time is long, large due to gate valve opening and closing must be fully open or close, gate travel, open to a certain space, high dimension, install the required space.
3。 Complex gate valves are generally have two sealing surface, add some to machining, grinding and maintenance, more difficult parts, manufacturing and maintenance more difficult, the cost is higher than globe valves.