The gate valves operated having a handwheel or by using electric actuators are popular from aoaltwar's blog

A gate valve is among the most widespread sort of industrial valves for pipelines. Its application area is incredibly wide. The gate valves operated using a handwheel or by making use of electric actuators are popular gate valve. A pneumatic or possibly a hydraulic actuator can be applied likewise.

Gate valve seize up because within the water that circulates through pump about the central heating system, eventually builds of iron and scale deposits, at the same time as other deposits that circulates, this consists of hot and cold water systems. All the deposits are likely to stick to rough areas over smooth areas, which is commonly valves. The deposits enter the mechanisms creating the moving parts to jam up in lieu of move smoothly.

How do I repair my gate valve without replacing it
If you intend to repair the gate valves in lieu of replace it, providing the valve spindle will not be damage then all that you should do is make valve outside the gate valve body and fix it up fully making certain there is no deposits left. Once the gate valve is fully clean, then you'll definitely need to greece the gate valve up, so that there isn't any friction between brass wear.

With the exception of parallel disk gate valve which includes parallel seats, all types namely, solid wedge gate valve, flexible wedge gate valve and split wedge gate valve have inclined V-shaped seats being a wedge. The Wedge gate valve is considered the most commonly used valve. This valve could be installed in any position.

Solid Wedge: Solid Wedge Disks are most frequently used because of simple and easy and less expensive design.
Flexible Wedge: A Flexible Wedge gate valve carries a disk which has a cut throughout the perimeter. A shallow cut gives less flexibility. A deeper cut provides more flexibility. Flexible Wedge gate valves are sometimes used in steam systems. The flexible gate prevents the disc from binding into your seat if the lines are heated which often can cause some distortion within the valve bodies check this link.

Split Wedge: Split Wedge gate valves are of ball and socket design. In a split wedge gate valve, both disk halves have outward contrary to the body seats by the spreader following disk continues to be fully lowered into its seating position.