Assertion: valve's ball | /r/HasProperty | the disc
Facets:
Source sentences:
text: : which is the element to control the degree of the valve opening and is mounted on the body of the valve the actuator : is the device that is used to move the modulating element of the valve, for example, the ball (ball valves), the disc (butterfly) or the stem (globe valves)
text: : is the device that is used to move the modulating element of the valve, for example, the ball (ball valves), the disc (butterfly) or the stem (globe valves) the controller FLOW CONTROL VALVE ACTUATORS