Operated via solid-state controls, the actuator opens and closes the valve by turning a rotor 90 degrees within the valve body. Should a signal or power loss occur, actuation can also be done via ...

About 25 of these motor-operated valves can be considered critical, including the boiler feedwater pump suction and discharge valves; feedwater valve; feedwater heater inlet, ...

Vacuum-operated EGR valves use a vacuum solenoid to vary the vacuum and direct it, opening and closing the EGR. Some systems even have sensors that feed information to the onboard computer. Digital ...

The most common reference in the industry for valve actuator motors (VAMs) are motor operated valves (MOVs). The reason the term “MOV” wasn’t used in the NEC when they were added to the document ...

Leakages can occur from tank-level control problems, air-operated valve setting issues, motor-operated valve thermal expansion, relief valve drifting, steam cutting of valves, improper valve ...