The CVS Series 667 Actuator is a reverse acting, spring opposed diaphragm actuator used for automatic operation of control valves. Suitable for on/off or throttling service.
The actuator positions the valve plug in the valve in direct response to the varying loading pressure on the actuator diaphragm. When the signal pressure increases to the lower diaphragm casing, the actuator stem is forced upward, compressing the spring.
When the signal pressure is reduced, the spring moves the actuator stem in the downward direction. If the signal pressure should fail, the spring will force the stem downward, providing “fail-closed action” for “push down to close” valves.
