SA-1 is an analogue positioner available in a pneumatic and electro-pneumatic version. The positioner has a heavy duty design making it suitable for use in very harsh conditions. It is used as the control part of the pneumatic valve set in oil and gas, refining, chemical, power, metal production and other fields with automated systems. The pneumatic version accepts a 3-15 psi (0.2-1 bar) signal and the electro-pneumatic version a 4-20 mA signal.

When using the electro-pneumatic version an I/P converter is installed on the pneumatic positioner which allows an electric signal to pilot the positioner. It is based on the balanced-forces principle; air distribution to actuator chambers is done by a spool.

It can be fitted on single or double acting actuators and the operational stroke is between 3-100mm for reverse action with the spring extended. The standard operational stroke length is 2-65mm for both direct and reverse action with a compressed cylinder spring with a maximum diameter of 200mm. The positioner works on a force balance type operating principle with linear characteristics. The feed-back element consists of a spring with a linear characteristic, actuated by the piston movement: no external elements for movement intake are required. SA-1 positioner is very compact and can be fully installed on the servo-control system, especially for pump use. This positioner is a double acting positioner but it can be used as a single acting one.


  • Available as full stainless steel spool valve
  • Compact design
  • Heavy duty design
  • High reliability
  • Intuitive mechanical and pneumatic construction
  • No external feedback system
  • Special characterisation/range
  • Split range signal
  • Suitable for:
    Standard, offshore, sandstorm, copper free ambient conditions
    Single and double acting actuators
    Low and high ambient temperature

Technical data

Input Signal

3-15 psi

4-20 mA

Standard operating temperature

-20°C to 70°C

(lower or higher temperature on request)

CV max low flow

ND 1/4” Inlet = 0.34

ND 1/4” Outlet = 0.34

Air consumption

1.02 Nm3/h (0.6 SCFM) at 400kPa (60 psi)

+0.09 Nm3/h (0.06 SCFM) for version with I/P

Feeding connection

 ND 1/4”

Electrical connection

 ND 1/2” NPTF

Supply pressure

2.5÷7 bar


0.5% of full stroke


1% of the full stroke


0.2% of signal range

Accessories available

Intrinsically safe and explosion-proof electro-pneumatic version for ATEX execution

Pressure gauges

Contact us for more information