CVS 657, 667, 1051, 1061
The CVS 657, CVS 667 sizes 30-80, and the CVS
1051 and 1061.
The series CVS 657 is a direct acting, spring opposed diaphragm
actuator with a 4-inch maximum travel. Signal pressure supplied
to the upper housing chamber forces the stem downward. When
the signal pressure is reduced, the compressive force on the
spring moves the stem upward. If the signal pressure should
fail, the spring will force the stem in the upward direction
providing “ fail - open action” for “push-down
to open” valves.
The series CVS 667 is a reverse acting, spring opposed, diaphragm
actuator with a 4-inch maximum travel. 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 in the downward position providing
“fail-closed action” for “push down to close”
Both the Series 657 and Series 667 actuators are used for
automatic operation of control valves used in applications
where throttling or on/off service is required.
The series CVS 1051 and 1061 is used for on-off service without
a positioner or for throttling service with a positioner.
The stroking time is dependent on the actuator size, rotation,
spring rate/compression, supply pressure, and size of supply
CVS Controls manufactures Control Valves and associated instrumentation
products to specification that facilitate the direct replacement
with FISHER* process control equipment.
* FISHER is a registered trademark of Fisher
Controls International Inc. Fisher Controls International
Inc. is not affiliated with CVS Controls Ltd. in any manner.
Fisher Controls International Inc. has not reviewed, sanctioned
or endorsed any products manufactured, reconditioned, sold
or marketed by CVS Controls Ltd.