Valve actuators provide force to move control valve trim. For precise positioning of a control valve, there must be a…
Disc valves (often referred to as eccentric disk valves, or as high-performance butterfly valves) are a variation on the butterfly…
Electric motors have long been used to actuate large valves, especially valves operated as on/off (“shutoff”) devices. Advances in motor…
A damper (otherwise known as a louvre) is a multi-element flow control device generally used to throttle large flows of…
A different strategy for controlling the flow of fluid is to insert a rotary element into the flow path. Instead…
Pneumatic actuators use instrument air pressure to apply force on the diaphragm to move the valve actuator and then to…
Hydraulic actuators use liquid pressure rather than instrument air pressure to apply force on the diaphragm to move the valve…
Although not a type of actuator itself, a form of actuation worthy of mention is where the process fluid pressure…
In the Ball Valve design, a spherical ball with a passageway cut through the center rotates to allow fluid more…
Globe valves restrict the flow of fluid by altering the distance between a movable plug and a stationary seat (in…
