The Role of Valve Positioners
As a control valve accessory and the interface between the control system and valves, the valve positioner plays a vital role in ensuring reliability and optimal performance in your process control loops. Using a valve positioning device, you can adjust the valves' opening to allow for varying flow rates, from entirely on or off to anywhere in between.
Valve positioners move a valve in the right direction by increasing or reducing the actuator's air load pressure. The position of the valve stem or shaft corresponds to the setpoint from the control system.
On linear control valves, positioners mount to the pneumatic actuator's yolk or top framework. Rotary control valves mount to the end of the shaft. For either set-up, the positioner is attached mechanically to the valve stem or valve shaft, allowing the valve position to respond to the controller's demands.
Valve Positioners from Siemens
SIEMENS offers you a broad choice of positioners to ensure an ideal fit for every application. Below is a summary of their offering:
SIPART PS100 is a smart positioner where reliable controllers are needed for for standard applications. Its ease and speed of initialization make it a winner for valve manufacturers, the chemical industry, the energy sector, and many other fields. The SIPART PS100 is available in two enclosure versions: aluminum or polycarbonate cover.
The SIPART PS2 has grown to become the most widely used positioner for linear and rotary actuators. Optionally available with Makrolon, aluminum, stainless or flameproof steel enclosure, the positioner is well-equipped for all ambient conditions. It has proved reliable in many valve control applications thanks to its diagnostics capability and extensive range of functions.
The Series 760 Valve Positioners provide a cost effective universal approach to your valve control. Their modular concept allows all models to be built on the base pneumatic unit (Model 760P). The electro-pneumatic model (Model 760E) is created by adding an I/P transducer to the base pneumatic unit, and a wide range of accessories easily installs inside the unit.
For more than 60 years, Ives Equipment Corporation has successfully served the industries of eastern and central Pennsylvania, Delaware, Maryland, Southern New Jersey and now Virginia with the latest in process control equipment and services. Our business has been built on a foundation of quality people, highly trained and experienced, who take a keen interest in finding the optimum solutions to our customers' control problems. Read more...
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