MH77 Series Hydraulic Actuator | Schlumberger
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MH77 Series

Hydraulic actuators

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The Saf-T-Gard actuator portfolio includes the MH77 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 4 to 6 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 - MH77 Series

Specifications

  • Model: MHW77
  • Series: 7000
  • Specific application sizing: 4 1/8 through 6 3/8 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: 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 Piston Size Valve Size, in Valve Pressure, psi Crack-Open Pressure, psi Hold-Open Pressure, psi Swept Volume, in3 Weight, lbm [kg]
MH7704 Single-piston hydraulic with 5-in piston 4 1/16 10,000 1,614 922 167 392 [178]
15,000 2,940 1,641 167 392 [178]
MH7705 Single-piston hydraulic with 5-in piston 5 1/8
 5,000 1,227 778 209 404 [183]
10,000 2,517 4,404 216 404 [183]
15,000 4,934 2,662 216 404 [183]
MH7706 Single-piston hydraulic with 5-in piston 6 3/8
 5,000 1,836 1,088 243 404 [183]
10,000 4,295 2,509 260 404 [183]

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