3-position (90° rotation) 3 position pneumatic actuators provide an operation of 0°- 45°- 90°. the intermediate position is achieved by an external mechanical stop of movement on the 2 auxiliary pistons (for spring return actuators it may be only one auxiliary piston). this intermediate stop position is adjustable from 0° to 90°, for example 5°, 20°, 30° 50°, 75° etc. the intermediate position is easily achieved by adjusting the external nuts located outside the two end-caps. both type, double acting and spring return, are available. field of application: for dosing, for exact filling and for any kind of services where on 90° rotation an intermediate stop position is desired.
in order to control the operation of air torque 3-position pneumatic actuators a system of solenoid
valves controlling a sequence of air supplies to the actuator is required as described below:
when ordering 3-position pneumatic actuators, add “3p” to the normal
actuator code and specify the desired stop position including the intermediate e.g. 0° - 45° - 90°.
position 1 (intermediate position):
this position is achieved when air is supplied simultaneously to
ports 2 and d whit exhaust air at ports 4 and c. in fact the air
supplied at ports d forces the auxiliary pistons to the center
and the rods serve as mechanical stops for the internal pistons
stopping in the desired intermediate position.
position 2 (fully open position):
this position is achieved when air supplied to port 2 and port c
(air to port c may also be avoided) with exhaust air at port
4. in this condition air to port 2 permits air to the internal pistons
to continue the opening stroke.
position 3 (fully closed position):
this position is achieved when air is supplied to port 4 with
exhaust air at port 2.

Welcome to Veson Valve Ltd., your premier destination for top-quality valve solutions. Our extensive product lineup boasts a variety of cutting-edge offerings designed to meet your diverse industrial needs. Among our flagship products are the VS series rack pinion rotary pneumatic actuator, VSF scotch yoke pneumatic actuator, hydraulic actuator, linear pneumatic actuator, gas-over-oil actuator, as well as a range of actuated valves and actuated butterfly valves.

With a proud history of serving the Oil Thermal and Water Supply sectors, Veson products have earned an exclusive reputation for reliability and performance. We've forged long-term partnerships with esteemed valve manufacturers, ensuring that we can deliver impeccable control valve solutions tailored to our customers' exact specifications. Our portfolio encompasses pneumatic ball valves, pneumatic butterfly valves, pneumatic and electric ball valves, regulating valves, globe valves, control valves, ESD, ESDV, SDV, and sophisticated pneumatic control systems.

Committed to excellence, Veson Valve Ltd. operates under the ISO9001:2015 certification, a testament to our unwavering dedication to quality and customer satisfaction. Our overarching goal is to establish the "VESON" brand as a symbol of unparalleled quality, offering competitive pricing and exceptional after-sales service. We extend a warm invitation to customers both domestic and international to engage with us, fostering enduring partnerships and collaborating on technical resources to enrich the pneumatic valve and expansion valve markets worldwide.

Join us on our journey to redefine industry standards and elevate the Veson experience to new heights. Let's build the future of valve technology together.