MHW79 Series Hydraulic Wirecutting Actuator | Schlumberger Products

MHW79 Series

Hydraulic wirecutting actuators

Our portfolio of Saf-T-Gard actuators includes the MHW79 series hydraulic wirecutting actuator, which is used in the master run of the tree on a reverse-acting gate valve. Our hydraulic wirecutting actuators incorporate features from our field-proven products, combined with our industry-leading, innovative technology. Particular attention has been given to safety and ease of maintenance.

They provide additional well shut-in protection during wireline operations. When wireline complications occur and the well shut-in procedure is recommended, the hydraulic wirecutting actuator provides a closing force to shear 0.108 in of wireline or 7/32 in of braided line to safely shut in the well.

Advantages

  • Superior piston design
  • Visual piston indicator
  • Spring system
  • Fail-safe close design
  • Corrosion-resistant materials
  • Nonpressurized actuator housing
  • Ease of maintenance
  • Permanent drift setting
  • Drain plugs flush housing
Saf-T-Gard Hydraulic Wirecutting Actuator - MHW79 Series

Specifications

  • Model: MHW79
  • Series: 7000
  • Specific application sizing: 5 1/8 through 9 in
  • API Classification: Spec 6A, 17th Edition, SSV
  • Trim for retained fluid components: Same as valve and bonnet specification
  • 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]
MHW7905

Single-piston hydraulic wirecutter with 9-in piston

5 1/8
5,000  977  784 311 TBD
10,000 1,800 1,189 328 TBD
MHW7906

Single-piston hydraulic wirecutter with 9-in piston

6 3/8
5,000 1,366 1,006 381 TBD
10,000 2,934 1,921 406 TBD
MHW7908

Single-piston hydraulic wirecutter with 9-in piston

8 5,000 TBD  TBD TBD TBD
10,000  TBD  TBD TBD TBD
MHW7909

Single-piston hydraulic wirecutter with 9-in piston

9 5,000 2,761 1,624 548 TBD

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