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STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5021, rev. 00 10/2015 – 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 customized adapting valve and an hydraulic cylinder which is necessary to
transmit the linear motion for the valve operation.
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
2) Hydraulic cylinder
3) Stop setting screw kit
Fig. 1: Main parts for SC/VHS actuator series
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