SC/V - Linear valve actuator


SC/V pneumatic linear piston actuators are designed to drive control valves for the most demanding applications of Power and Oil & Gas Industries, such as turbine bypass, stem conditioning valves, desuperheaters, valve compressors antisurge and many other.
Thanks to the special patented design of piston, including a double rings guiding system and a grease channel providing continuous lubrification, SC/V actuators grant smooth and precise valve operation without any maintenance for whole operating life.
This series of actuators are designed with patented plug-in connection system for a wide range of customer-tailed accessories and control system to meet the most demanding and critical operating conditions.

You can evaluate the double acting stroking time here


    • Built in lubrication system makes it virtually maintenance free
    • Double acting and single or double acting plus spring design
    • Designed to meet SIL 3 requirements (IEC61508) as a “single device”
    • Exhaust mufflers with integral non return valve to prevent contamination of actuator internals
    • Full stainless steel version available
    • Long operating life with double guide for piston and bushing
    • Manifold mounted 3-way valves and accessories for optimal performances and increased safety
    • Single/Duplex/Triplex configuration available for thrust and space optimization


Operating pressure

Pneumatic version up to 10 barg

(special version available on request)

Standard operating temperature

-20°C to 70°C

(lower or higher temperature on request)

Standard pneumatic supply medium

Air, nitrogen or sweet gas

(special version for sour gas on request)


  From 150 mm to 1600 mm

(larger sizes on request)


PED 2014/68/EU

ATEX 2014/34/EU 

EAC TR TS 012/2011 


IP66/67M according to IEC/EN 60529 

SIL3 certified (IEC 61508) as a “single device”

Designed and tested in accordance with EN 15714-3

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


IMI STI valves, actuators, positioners, SC Series, SC/V - Linear 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.