Manual Hold-Open Device with Limit Switches | SLB

Manual Hold-Open Device with Limit Switches

Manual valve operation in absence of control pressure

Schlumberger Oilfield Services

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.

Compact, simple design

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.

Specifications
Specifications, Specifications Manual Hold-Open Device
Specifications Service Specifications All applications
Specifications Max. torque, lbf.ft Specifications 195
Specifications Revolutions per in Specifications 5
Specifications Product weight, lbm [kg] Specifications 21 [9.5]
Specifications Shipping weight, lbm [kg] Specifications 25 [11.4]
Specifications, Specifications Limit Switch Assembly
Specifications Manufacturer Specifications General equipment GO switch
Specifications Model Specifications Series 70, Model 75
Specifications Conduit outlet, in NPT Specifications 1/2 to 14
Specifications Type Specifications Single pole, double throw (SPDT)
Specifications Outlet position Specifications Bottom of enclosure
Specifications Certification Specifications British Approval Service for Electrical Equipment in Flammable Atmospheres (BESEEFA) and European Committee for Electrotechnical Standardization (CENELEC)
Manual Hold-Open Device with Limit Switches