General Description

Pneumatic scotch yoke actuators QUIFER are in the market for more than 15 years. These actuators are popular for their high resistance and durability and, in consequence, the reduction of the maintenance cost in the production lines. For that reason, our actuators are used in the more exigent markets and environments like oil and gas, offshore platforms or vessels.

Actuators completely designed, machined and tested in our factory of Spain. Raw material origin of European Suppliers. Stock of the key pieces that allow us to give quick delivery time to our customers. Projects already done like Sour Pars, Yamal or Yanboo are guarantee of the acceptance of these actuators in the market.
The linking surfaces of the actuators are designed according ISO 5211 and VDI/VDE 3845.
Design of the actuator is constructed according ISO9001:2008, IEC 61508:2010, LOM 10ATEX6032 and European Pressure Equipments Directive 97/23/EC 3.10


Standard Actuator Scope

Double Acting Spring Return
Torques: 100.000 Nm 50.000 Nm
Working pressure: 1 to 10 bar 2 to 10 bar
Air supply: Air or non corrosive gas
Working temperature: From -20 to +80ºC
Rotation: 90 degrees Anticlockwise in opening
Adjustments: +/- 5ºC to open +/- 5ºC to close
Lubrication: Actuators lubricated for life

Technical Data

  All components have high resistance to corrosion
  All models have a double opening and closing regulation from the outside
  Multiple combination spring cartridges and air cylinders that allow a wide range of torques for one model
 All springs have a preloader, increasing safety
 All models are easily convertible from spring return to double acting and vice versa
 Modular contruction allow the pneumatic cylinder and spring catridge to be assembled to either both sides of the central body

 Spring cartridge welded to ensure safety when disassembling
 Totally enclosed weather proof central body



 Inner cylinder has been completely honey treated to obtain 0,3 – 0,4 mic. Rugosity
 Hard chromed cylinder as standard
 Piston with larger sliding surface to increase concentrity
 All bars made of chromed carbon steel
 All bushings made of bronze
 Bank of grease in all sliding parts of the actuator
 Nitrured yoke to increase life and sliding properties
 Oversided slide and slide block mechanism
 Special loking device between sliding block and bar
 2 Springs for large sizes to avoid buckling
 Welded spring cartridge



 Low temperature versions up to -60ºC
 High temperature up to +180ºC
 Stainless Steel air cylinder
 Fast closing time actuators
 Actuators driven with Natural Gas, Sour Gas, Oxygen, etc, etc…
 Adjustable travel stops from 0º to 90º
 Actuators for SDV valves
 Canted version for buttefly valves and dampers available
 Special bolting and nuts
 Customized actuators


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