General Description

Hydraulic 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. The linking surfaces of the actuators are designed according ISO 5211 and VDI/VDE 3845. Design of the actuator is constructed according ISO9001:2008, LOM 10ATEX6032 and European Pressure Equipments Directive 97/23/EC 3.10.

The actuators are PED, ATEX and GOST certified and manufactured under the ISO9001:2008 rules with the continuous improvement policy.

Standard Actuator Scope

Double Acting Spring Return
Torques: 10.000 Nm 50.000 Nm
Working pressure: 50 to 200 bar
Supply: Hydraulic Oil
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

Linking surfaces according ISO 5211 and VDI/VDE 3845
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
Travel stops located in the axial side of the actuator



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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