STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5020, rev.03 07/2021 - SC/VHS 3
2 DEVICE DESCRIPTION
2.1 General Description
SC/VHS single acting hydraulic actuators are suitable for the operation of linear valves for ON-OFF
and modulating heavy-duty service.
The actuator is made up of a hydraulic cylinder, with internal return spring, which is necessary to
transmit the linear motion for the valve operation.
Two different versions are available depending on the position reached by the piston rod in case of
loss of hydraulic pressure: fail extend (FE) and fail retract (FR).
When requested the linear stroke of the valve is adjustable by means of the external mechanical stop
for upward position and by the adjustment of the coupling of valve stem to actuator joint for the
downward position.
The actuator pedestal has a flange with threaded holes to fix the actuator to the valve.
STI can offer different types of control system according to specific Customer's requirements.
2.2 Identification of the Main Parts
The SC/VHS actuator is composed by the following main parts:
1) Adapting valve assembly (optional)
2) Hydraulic linear actuator with internal spring package
3) Stop setting screw kit (optional)
4) Coupling Joint (optional)
Fig. 1: Main parts for SC/VHS actuator type
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