While many pneumatic, modulating control valves can be used for on/off service by supplying air pressure to the actuator in excess of the spring range, they are sometimes an inadequate solution to control a process. True on/off control valves, like the Mark 76, offer many advantages over this approach.
The Mark 76 (1/2" - 2") typically functions using a 0 psi or 20 psi control signal. Through the use of a solenoid, either 0 psi or 20 psi is supplied to the actuator. Depending on the configuration of the sliding gate seats, 20 psi will either open or close the valve.
Extremely fast opening and closing times. Short stroke and straight-through flow provide rapid control
Due to the short stroke of the sliding gate seat, less force is required to operate the valve
Longevity – Lab testing has shown that the MK76 displayed no wear on the diaphragm after 10 million cycles