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The Shafer Valve Positioning System consists of three integral components: a
pneumatic or electric positioner, a valve actuator and a quarter-turn valve.

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*** Positioner
Several commercially available brands of positioners can be utilized in the
system. Extensive laboratory testing and field proven experience are
associated with each of the positioner brands and types listed below. Our
Sales Engineers can help you choose the positioner best suited for your
application and budget. Shafer will also use other brands of positioners if
specified by the customer.

"PMV" Series P-1500, Pneumatic or Series P-2000, Electro-Pneumatic
Positioners

"Moore" Model 750P Pneumatic, Model 750E I/P Electronic Positioners or
Series 760 Valve Controller.

*** Valve Actuator
The G-Series, Scotch Yoke Type Valve Actuator provides excellent
performance on natural gas pipeline applications. The G-Series double
acting piston actuator can utilize high pressure gas, from the pipeline, as
its power source thus minimizing size, weight, and cost of the actuator.
Also, with the high pressure actuator design, there is no need for a power
gas regulator or separate low pressure power supply.

If you do not have specific product literature on the G-Series type valve
actuators, or if your application is not for natural gas pipelines, please
contact the sales department and we will forward additional information to
you promptly.

*** Valve
The Shafer Valve Positioning System can be adapted to most types of
quarter-turn valves; ball, plug or butterfly. The manufacturer and specific
valve model are usually specified by the customer.

The most economical approach for the customer is to purchase the valve
as a separate item directly from the valve manufacturer. The actuator and
control system can be mounted to the valve or valve extension at the
construction site, even after the valve has been installed in the pipeline.

If you prefer that Shafer supply the valve, we do have the full capability to
supply the complete system, including the valve, purchased to your
specifications.

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