They are set up in pipelines as isolating valves from aoaltwar's blog

Gate valves are widespread for all varieties of applications and therefore are suitable for both above-ground and underground installation view more. Not least for underground installations, it's paramount to decide on the right style of valve to stop high replacement costs.

Gate valves focus on fully open or fully closed service. They are set up in pipelines as isolating valves, and may not be used as being a control or regulating valves.Operation of the gate valve is completed doing an either clockwise to shut (CTC) or clockwise to open up (CTO) rotating motion on the stem. When operating the valve stem, the gate moves up- or downwards around the threaded part on the stem.

The sorts of gate valves might be divided into wedge disc gate valves and parallel disc gate valves based on the sealing surface configuration. Wedge disc gate valves could be further split up into: single gate, double disc and elastic disc; parallel disc gate valves could be Divided into single disc type and double disc type. According to the thread position with the valve stem, it may be divided into rising-stem gate valve and non rising-stem gate valve.

Installation and repair off rising-stem gate valve:
Handwheels, handles and transmission mechanisms are certainly not allowed to be taken for lifting, and collisions are strictly prohibited.The double disc gate valve really should be installed vertically (which is, the valve stem is within the vertical position along with the handwheel reaches the top).The gate valve which has a bypass valve ought to be opened before opening (to balance pressure to succeed difference between the inlet and outlet and lower the opening force).The gate valve with transmission mechanism needs to be installed in accordance with the product manual.

As the gate or wedge must travel along the entire cross-section in the valve bore, the general height of gate valve is larger over a ball valve the industry quarter turn valve and doesn't require vertical movement from the stem.

Gate valves are offered with renewable seats which might be usually tricky to change out in-situ.
The valve flow characteristics of gate valve could cause high velocity of flow to happen for longer duration whilst the opening or closing the valve because of slow movement of wedge or gate ball valve . High velocities may cause erosion of seat and also the disc thereby lowering the design life with the valve. This condition can also be referred to as “wire drawing” effect.