SC/VH - Linear hydraulic valve actuator


SC/VH hydraulic linear piston actuators are designed to drive on/off and control valves for the most demanding applications in the Power and Oil & Gas industries; such as choke, gate, globe and wedge valves.
Thanks to the rugged and reliable design SC/VH actuators ensure smooth and precise valve operation without any maintenance for the whole operating life, even in the harshest of environments.
This actuator is manufactured in carbon steel material without any cast/grey/ductile iron or aluminium parts.

You can evaluate the double acting stroking time here


    • Action inversion without tubing inversion only for ND 1/4” version
    • An integral or declutchable manual hand-wheel or hydraulic hand pump available on request
    • Customised valve bracket, open or close design on request
    • Double acting or spring return design
    • Electroless nickel plated cylinder to minimise friction and prevent corrosion
    • Full stainless steel version available for both double acting and spring return actuators
    • Multiple lifting lugs ideally located to balance centre of gravity for safe lifting 
    • Quick connection solution for valve adaptation available on request


Standard supply medium

Hydraulic oil

Fire resistant fluid version

Standard operating temperature

-30°C to 100°C

(lower or higher temperature on request)

Operating pressure

Up to 350 barg


  From 30 mm to 300 mm or larger


PED 2014/68/EU

ATEX 2014/34/EU


IP66/67 according to IEC/EN 60529

Further certifications are available, please contact us for updated list.


IMI STI valves, actuators, positioners, SC Series, SC/VH - Linear hydraulic valve actuator

SC series of actuators is provided with a built-in permanent lubrication system, patented by IMI STI, which assures an extremely smooth valve operation even if dry instrument air is used. Thanks to this lubrication system, which is common to IMI STI linear actuators, no maintenance to moving parts is required, even after many years of continuous service.

The patented lubrication system consists mainly of a grease lubricant filled annular cavity placed inside the cylinder piston, between a sealing ring and a sliding ring to avoid direct contact between the metal surfaces of the piston and the cylinder, even in case of lateral forces acting on the actuator stem. The grease in the annular cavity keeps the metal parts lubricated during piston movement allowing very smooth sliding and a long seal life.