What is a gate valve?
A gate valve is a multiturn valve meaning that the operation of the valve is done by means of a threaded stem. As the valve has to turn multiple times to go from open to closed position, the slow operation also prevents water hammer effects. Gate valves can be used for a vast number of fluids.
How does a gate valve work?
Gate valves work by inserting a rectangular gate or wedge into the path of a flowing fluid. They are operated by a threaded stem which connects the actuator (generally a hand wheel or motor) to the stem of the gate. If the valve has a rising stem its position can be seen just by looking at the position of the stem.
What is a knife gate valve?
Knife gate valves are designed mainly for on-off and isolation services in systems with high content of suspended solids.The valves have a minimised pressure drop in fully open position, they are easy to actuate, they have a relatively low weight and are cost effective.