The gate valves operated having a handwheel or with the aid of electric actuators are popular from aoaltwar's blog

A gate valve is easily the most widespread style of industrial valves for pipelines. Its application area can be quite wide. The gate valves operated using a handwheel or through the help of electric actuators are popular gate valve. A pneumatic or perhaps a hydraulic actuator can be applied too.

Gate valve seize up because within the water that circulates through pump about the central heating system, eventually accumulates 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 have a tendency to stick to rough areas over smooth areas, which is frequently valves. The deposits be in the mechanisms creating the moving parts to jam up as opposed to move smoothly.

How do I repair my gate valve without replacing it
If you wish to repair the gate valves instead of replace it, given that the valve spindle is just not damage then everything you should do is go ahead and take valve outside the gate valve body and wash it up fully being confident that there is no deposits left. Once the gate valve is fully clean, you'll need to greece the gate valve up, so that there's no friction between brass wear.

With the exception of parallel disk gate valve which includes parallel seats, all the other 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 regarded as the commonly used valve. This valve can be installed in any position.

Solid Wedge: Solid Wedge Disks are most popular because of easy and less expensive design.
Flexible Wedge: A Flexible Wedge gate valve incorporates a disk having a cut round the perimeter. A shallow cut gives less flexibility. A deeper cut provides more flexibility. Flexible Wedge gate valves tend to be used in steam systems. The flexible gate prevents the disc from binding to the seat if the lines are heated which may cause some distortion from the valve bodies check this link.

Split Wedge: Split Wedge gate valves are of ball and socket design. In a split wedge gate valve, the 2 disk halves have no choice but outward up against the body seats by way of a spreader following your disk has become fully lowered into its seating position.