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The Fisher™ 667 Diaphragm Actuator is a reverse-acting, spring-opposed pneumatic actuator designed for sliding-stem control valves. Unlike the Fisher 657, which is direct-acting, the 667 actuator applies signal pressure beneath the diaphragm to push the stem upward, while the spring provides the opposing downward force. This reverse-acting design is widely used in applications where fail-safe…
The Fisher™ 657 Diaphragm Actuator is a direct-acting, spring-opposed pneumatic actuator designed for reliable operation of sliding-stem control valves. Signal pressure applied to the upper diaphragm housing drives the actuator stem downward, while the spring provides fail-safe return action when pressure is reduced. This proven design is widely used in throttling and on/off service across…
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