Model E Hydraulic Actuator | ProductsSLB

Model E

Hydraulic actuators

The SSS surface safety system actuator line includes the compact Model E hydraulic actuator. Intended for gate valves from 1 13/16 through 7 1/16 in, this durable actuator can operate valves with pressures up to 15,000 psi [1,034 bar] with control pressures of 6,000 psi [414 bar].

The piston assembly is located in the top of the actuator and is available in 5- and 7-in sizes. The actuator also includes a large piston area that permits the use of lower control pressures. In the fail-safe position, the stem rises and serves as a visual indicator. The Model E design incorporates the patented Quick-Disconnect bonnet, which allows for installation or removal of the actuator without depressurizing the gate valve.

Variations

  • Two-piece housing: This design can be redressed without removal from the bonnet/valve assembly and without the need for any special tools. The actuator can be used with various top-mounted accessories, such as electric limit switches and manual openers.
  • One-piece housing: This design can be used when side-mounted limit switches are desired in lieu of top-mounted switches. This eliminates the need to remove the switches in order to install other accessories, such as mechanical openers or lock-out caps.

The Model E actuator is available for standard, H2S, and CO2 service, with temperature ranges from –20 to 250 degF [–29 to 121 degC]. Optional side-mount magnetic limit switches are available to provide valve position indication to a remote control station. A model for arctic service also is available.

Features

  • Rising stem provides visual indication of gate valve position
  • Large piston area allows relatively low control pressures to overcome full valve differential
  • Captured power spring ensures closure even when no valve body pressure is present in the hydraulic actuator
  • Molygard wiper rings help to prevent stem galling during operation and prohibit foreign particles on the surface of the stem from entering the actuator body and damaging the dynamic seal system
  • External safety relief device protects the actuator from over pressurization
  • Fire seal includes a bonnet assembly that incorporates the same metal-to-metal backseat design as our standard product line and will afford protection against packing blowouts in the event of a fire
SSS Model E Hydraulic Actuator

Specifications

Service for 5-in piston

  • Maximum operating pressure: 6,000 psi [413 bar]
  • Safety head maximum working pressure: 6,200 psi [427 bar]
  • Test pressure: 9,300 psi [632 bar]
  • Temperature range: –20 to 250 degF [–29 to 121 degC]
  • Product weight: 190 lbm [86 kg]
H2S Service
Maximum Control Pressure
Mounted on 2 1/2-in valve (0.120 × valve pressure) + 50 psi [3.4 bar]
Mounted on 3-in valve
(0.160 × valve pressure) + 50 psi [3.4 bar]
Mounted on 4-in valve
(0.227 × valve pressure) + 75 psi [5.1 bar]
Mounted on 4-in valve with eight-bolt bonnet assembly (0.330 × valve pressure) + 75 psi [5.1 bar]
 

Service for 7-in piston

  • Maximum operating pressure: 6,000 psi [413 bar]
  • Safety head maximum working pressure: 6,200 psi [427 bar]
  • Test pressure: 9,300 psi [632 bar]
  • Temperature range: –20 to 250 degF [–29 to 121 degC]
  • Product weight: 400 lbm [182 kg]
H2S Service Maximum Control Pressure
Mounted on 5-in valve
(0.294 × valve pressure) + 75 psi [5.1 bar]
Mounted on 6-in valve
(0.315 × valve pressure) + 75 psi [5.1 bar]
Mounted on 6 3/8-in valve with eight-bolt bonnet assembly (0.340 × valve pressure) + 22 psi [1.5 bar]

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