Useful on high-pressure valves
Stroke an actuator or operate a valve in the absence of system control pressure.
Manual valve operation in absence of control pressure
Cameron's manual hold-open device is designed for use with actuated gate valves sized 3 in and smaller in diameter with internal valve pressure up to 10,000 psi.
This hold-open device is used to manually operate the valve when control pressure is not available. The device threads directly to the top of the actuator. Rotating the handwheelproduces enough torque to overcome the actuator spring force and mechanically open the valve.
A hydraulic boostershould be used on high-pressure valves or any instance where the surface safety valve (SSV) must be manually opened and the maximum torque of this device is exceeded. This is to be used as a hold-open device only.
The space-saving design incorporates both the manual hold-open device and limit switches in one assembly, significantly reducing the overall length. The device is easy to install or remove by simple hand rotation on top of the actuator threaded boss. The upper and lower limit switches are easily and accurately adjusted by external jam nuts, thus eliminating trial and error settings.
|Manual Hold-Open Device|
|Max. torque, lbf.ft||195|
|Revolutions per in||5|
|Product weight, lbm [kg]||21 [9.5]|
|Shipping weight, lbm [kg]||25 [11.4]|
|Limit Switch Assembly|
|Manufacturer||General equipment GO switch|
|Model||Series 70, Model 75|
|Conduit outlet, in NPT||1/2 to 14|
|Type||Single pole, double throw (SPDT)|
|Outlet position||Bottom of enclosure|
|Certification||British Approval Service for Electrical Equipment in Flammable Atmospheres (BESEEFA) and European Committee for Electrotechnical Standardization (CENELEC)|