MHW70 Series Hydraulic Piston Actuators | SLB

MHW70 Series

Hydraulic piston actuators

A man operating a valve.

The MHW model of Saf-T-Gard actuators provides enough force to shear wireline, braided line, or coiled tubing in the event that the well must be shut down during an emergency condition.

It contains the same features as the standard MH model and adds springs that provide the thrust to perform the cutting force required.

Saf-T-Gard MHW actuators offer a reliable and robust design that can be installed in harsh and remote environments.


  • Fail-safe design
  • Rising and nonrising stem designs
  • Head and housing orientation
  • Nonpressurized actuator housing
  • Superior piston design
  • Cameron seals
  • Fixed drift adjustment
  • Easy maintenance
  • Accessories
Saf-T-Gard MHW70 Actuator



  • API Spec 6A actuators for use with 4 1/8- through 6 3/8-in nominal gate valves
  • API Spec 6A Appendix F, PR-2-qualified
  • Temperature range: –20  to 250 degF [–29 to 121 degC]
  • Standard piston sizes: 4 to 7 in
  • 6,000-psi maximum operating pressure
  • 9,000-psi test pressure
  • Standard 1/2-in NPT inlet port
  • Wireline cutting closing force
  • Wide range of options and accessories available


  • Standard stem and bonnet material: API (material and temperature class dependent)
  • PSL 1, 2, 3, and 4 available
  • Standard bonnet backseat test port provided
  • Standard packing leak indicator port provided