Side Actuated Gate Valve

If the valve has a rising stem its position can be seen just by looking at the position of the stem.

Side actuated gate valve.

They re designed to meet or exceed awwa standards and have for decades been recognized as the original and definitive standard. A gate valve also known as a sluice valve is a valve that opens by lifting a barrier gate out of the path of the fluid gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened. Rising stems are fixed to the gate and they rise and lower together as the valve is operated providing a visual indication of the valve position and making it possible to grease the stem. The gate valve cycle time is controlled by air pressure entering into and exhausting out of the air cylinder simultaneously.

Diaphragm actuators are made out of a round piece of rubber and squeezed around its edges between two side of a cylinder or chamber that allows air pressure to enter either side pushing the piece of rubber one direction or the other. Gate valves work by inserting a rectangular gate or wedge into the path of a flowing fluid. The gate faces can be parallel but are most commonly wedge shaped in order to be able to apply pressure on the sealing surface. The two main types of linear actuators are diaphragm and piston.

Gate valves with rising vs non rising stem design. Gate valve general information gate valve operation description pneumatically actuated gate valves are opened and closed by applying air pressure to either side of a piston located in the air cylinder of an actuator housing.