Actuators

Type 1030
Heavy Duty Scotch-Yoke Actuator

CVS SERIES 657 & 667

Sizes 30 – 80

  • The CVS Series 657 is a direct acting, spring opposed diaphragm actuator with a 3 inch maximum travel. Signal pressure supplied to the upper housing chamberforces the stem downward. When the signal pressure is reduced, the compressive force on the spring moves the stem upward . If the signal pressure should fa il, the spring will force the stem in the upward direction providing “fail-open action” for “push down to close” valves.
  • The CVS Series 667 is a reverse acting, spring opposed, diaphragm actuator with a 3 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 position. 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” valves.
  • Both the CVS 657 & 667 actuators are used for automatic operation of control valves used in applications where throttling or on/off service is required .

CVS SERIES 1051 ROTARY ACTUATOR

Sizes 30 – 70

  • CVS Type 1051 Diaphragm Rotary Actuator is a pneumatic spring return design for rotary shaft control valves.
  • It is suitable for on/off service or throttling service when used with a valve positioner.
  • Air is supplied to the top of the actuator, as air pressure increases it compresses the spring and the diaphragm rod travels down. The rod is connected to a lever which causes the valve shaft to rotate. When air supply fails the spring expands and the valve shaft rotates the opposite direction.
  • Stroking time is dependent on actuator size, spring rate, and supply pressure.
  • The travel indicator is a combination graduated disc and pointer on the actuator end.
  • Fixed travel stops are an available option.

CVS RACK AND PINION ACTUATOR

  • Rack and Pinion Actuators are used to open or close bailor butterfly valves with 900 rotation. Rack and Pinion Actuators are activated by pneumatic or hydraulic fluid. The supply pressure pushes pistons together or apart causing the pinion shaft to rotate opening or closing the valve.
  • The actuators can be double acting or spring return. Double acting requires supply pressure to open and close the actuator.
  • Single acting actuators require supply pressure to open the actuator, when the supply pressure is removed the springs push the pistons back to the original position.
  • Single acting actuators can be fail open or fail closed
  • CVS actuators are available in sizes 50 to 1000 with torques 50 in/lbs to 44,000 in/lbs.
CVS actuators are temperature rated from -50°C (-58°F) to 80°C (176°F) with standard seals made of low temperature nitrile. The actuators adhere to ISO 9001 : IS05211, DIN3337, and VDI/VDE 3845 NAMUR standards. Each actuator has position indication with NAMUR drive slot for positioners and pneumatic connections. The output shaft and valve mounts meet NAMUR standards. Each actuator has stroke adjustment 0° to 90°, +/-4 degrees. Direction of shaft rotation can be done easily by inverting the pistons.