Model C Hydraulic Actuator | ProductsSLB

Model C

Hydraulic actuators

In a unique design approach, the Model C hydraulic actuator works by moving the piston assembly to the bottom of the actuator, which allows the power spring to be immersed in clean hydraulic oil, thereby preventing corrosion even under harsh operating conditions.

This actuator is an excellent choice for remote installations where regular maintenance may be difficult. The C features a strong power spring that ensures complete gate closure upon loss of control pressure.

This actuator also includes a quick-disconnect feature that separates the bonnet from the actuator, allowing for maintenance of the actuator while the bonnet safely holds pressure inside the gate valve. 

The Model C actuator operates valve sizes from 1 13/16 through 4 1/16 in, with operating pressures up to 10,000 psi [689 bar]. In addition, the actuator also operates 6 3/8-in gate valves with operating pressures up to 5,000 psi [345 bar]. Actuators are available with a 3- or 4-in piston to optimize control pressures and meet your application requirement.

Features

  • External safety relief device protects the actuator from overpressurization
  • Power spring immersed in clean hydraulic oil provides long-term operation and reliable closure
  • Quick-disconnect feature permits removal of actuator without depressurizing the valve, which greatly reduces downtime and lost production
  • Visible actuator shaft that provides visual indication of gate valve position
SSS Model C Hydraulic Actuator

Specifications

Service for 3-in piston

  • Maximum operating pressure: 7,500 psi [517 bar]
  • Test pressure: 11,250 psi [776 bar]
  • Temperature range: –20 to 250 degF [–29 to 121 degC]
  • Product weight: 130 lbm [59 kg]
H2S and Standard Service
Maximum Operating Pressure
Mounted on 2-in valve (0.362 × valve pressure) + 140 psi [9.6 bar]
Mounted on 2 1/2-in valve (0.416 × valve pressure) + 140 psi [9.6 bar]
Mounted on 3-in valve
(0.570 × valve pressure) + 140 psi [9.6 bar]
Mounted on 4-in valve (0.827 × valve pressure) + 140 psi [9.6 bar]

Service for 4-in piston

  • Maximum operating pressure: 7,500 psi [517 bar]
  • Test pressure: 11,625 psi [801 bar]
  • Temperature range: –20 to 250 degF [–29 to 121 degC]
  • Product weight: 238 lbm [108 kg]
H2S and Standard Service
Maximum Operating Pressure
Mounted on 2-in valve
(0.195 × valve pressure) + 75 psi [5.1 bar]
Mounted on 2 1/2-in valve
(0.224 × valve pressure) + 75 psi [5.1 bar]
Mounted on 3-in valve (0.306 × valve pressure) + 75 psi [5.1 bar]
Mounted on 4-in valve (0.450 × valve pressure) + 75 psi [5.1 bar]
Mounted on 5-in valve (0.773 × valve pressure) + 75 psi [5.1 bar]
Mounted on 6-in valve (0.890 × valve pressure) + 75 psi [5.1 bar]

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