MH79 Series Hydraulic Actuator | Schlumberger Products

MH79 Series

Hydraulic actuators

The Saf-T-Gard actuator portfolio includes the MH79 hydraulic actuator, which is used in the master run or wing run of the tree on a reverse-acting gate valve. The hydraulic actuator product line incorporates features from our field-proven products, combined with our industry-leading, innovative technology. Particular attention has been given to safety and ease of maintenance.

This hydraulic actuator series can be used with all manufacturers' gate valves in nominal sizes from 6 to 9 in. Its simple design and operating principle make this hydraulic actuator suitable for all types of applications.

Advantages

  • Superior piston design
  • Visual piston indicator
  • Compression spring
  • Nonpressurized actuator housing
  • Fail-safe close design
  • Corrosion-resistant materials
  • Ease of maintenance
  • Permanent drift setting
  • Drain plugs flush housing
Saf-T-Gard Hydraulic Actuator - MH79 Series

Specifications

  • Model: MH79
  • Series: 7000
  • Specific application sizing: 6 3/8 through 9 in
  • API Classification: Spec 6A, 17th Edition, SSV
  • Trim for retained fluid components: Same as valve and bonnet specifications
  • PR-1 and PR-2: Appendix F 2.5
  • Maximum operating pressure: 6,000 psi [414 bar]
  • Relief device setting (optional): 6,000 psi [414 bar]
  • Test pressure: 9,000 psi [621 bar]
  • Trim for standard components: AA
  • PSL: Retained fluid 1, 2, 3
  • Operating temperature: –20 to 250 degF [–29 to 138 degC]
Model Valve Size, in
Valve Pressure, psi
Crack-Open Pressure, psi
Hold-Open Pressure, psi Swept Volume, in3
Weight, lbm [kg]
MH7906 6 3/8 5,000 1,366 1,006 381 392 [178]
6 5/8 10,000 2,934 1,291 406 392 [178]
MH7907 7 1/8 5,000 1,386 1,126 406 404 [183]
7 1/16 10,000 TBD TBD TBD 404 [183]
MH7908 8 1/16 5,000 TBD TBD TBD 404 [183]
MH7909 9
5,000 2,761 1,624 548 404 [183]
6,500 3,097 1,959 548 404 [183]

*API requires that only retained fluid actuators must have a PSL rating.

** For special temperature applications, contact Cameron Engineering.

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