Flowserve Valtek VR User Instructions page 2

Valtek VR Spring Cylinder Rotary Actuators
Valtek VR Spring Cylinder Rotary Actuators
The Valtek® VR combines high torque and pneumatic stiffness with excellent throttling capabilities. These characteristics are designed into
a lightweight, rugged, and compact assembly, making the Valtek rotary actuator the foremost choice for quarter-turn applications. The
Valtek rotary actuator is designed to operate the Valdisk high-performance butterfly valve, the Shearstream V-notch ball valve, Maxflo
Eccentric Rotary plug control valve or other applications requiring precise rotary motion. Valtek pneumatic and electro-pneumatic
positioners are available for throttling applications.
The Valtek VR actuator, cylinder and positioner are designed for supply pressures up to 150 psi (10.3 bar) for sizes VR25, VR50, VR100
and 80 psi for VR200 (5.5 bar), making very high torques attainable. The actuator uses a rocking piston for direct conversion of linear
motion to rotary motion. The rocking piston assembly combined with a splined shaft and lever eliminates lost motion. The following
instructions are designed to assist in unpacking, installing, and performing maintenance as required on Flowserve Valtek VR.
This instruction manual does not include specific product design data. Such data can be found on the actuator's specification documents;
additionally, dimensional information can be found in the Valtek VR technical bulletin. Procure needed documents as necessary before you
begin any work on the valve.
User Instructions cannot deal with all possible situations and installation options. It is required that only trained and qualified technicians
are authorized to adjust, repair or work on Valtek VR, positioners, and other accessories. Review this bulletin prior to installing, operating,
or performing any maintenance on the actuator. Additional Installation, Operation, and Maintenance Instructions (IOMs) cover other
features (such as positioners and other accessories).
To avoid possible injury to personnel or damage to actuator parts DANGER, WARNING, CAUTION and NOTICE indicators must be strictly
followed. Modifying this product, substituting non-factory parts or using maintenance procedures other than outlined could drastically affect
performance and be hazardous to personnel and equipment and may void existing warranties. This manual should be used in conjunction
with applicable local and national laws. Failure to comply with User Instructions will render the manufacturer's guarantee and liability null
and void. Unless otherwise agreed, the manufacturers near terms and conditions of sale shall apply.
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VLAIM031-14 (EN/AQ) May 2023