Showing posts with label flow control. Show all posts
Showing posts with label flow control. Show all posts

Valve Positioners

Valve Positioners

Valve positioners control a valve's position (ball, butterfly, and globe) such that a given process will achieve specific desired flow parameters. They perform this by determining the error between the optimum valve position and actual valve position. With specialized sensors mounted on the valve stem or actuator shaft, these sensors compare the magnitude of error between the setpoint from the control system and the actual process value. The positioner's corrective output is sent electrically or pneumatically to a valve actuator, which moves the valve in the corrective direction. 

As a control valve accessory and the interface between the control system and valves, positioners play a vital role in ensuring the process loop's performance. The valve positioner adjusts the valves' opening, thereby varying the valve's flow rates, from completely shut or wide open to anywhere in between. An example of this type of positioning control will include mixing hot and cold water to achieve a specified downstream temperature requirement. By controlling the valve's opening and closing, process control parameters such as flow, pressure, level, and temperature are maintained

Piping Specialties / PSI Controls offers a full range of positioning equipment, including pneumatic, electro-pneumatic, intrinsically safe, explosion-proof, and Smart type positioners.

Piping Specialties / PSI Controls

A-T Controls Industrial Valve, Actuator and Controls Product Overview

A-T Controls in New England

A-T Controls is a global leader in the design, manufacturing, and sale of manual & automated process valves for all types of industries. A-T Controls is known for its extensive inventory and highly experienced staff that enable them to provide the customer solutions needed to fulfill most valve and actuator requirements while offering both a competitive price and the fastest turnaround in the industry.

A-T Controls products provide high-performance operation in virtually every industry, including Oil & Gas, Refining, Petrochemical, Chemical Processing, Pulp & Paper, Mining, Transportation, Food and Beverage, Pharmaceuticals, Marine, HVAC, Power, and more.

A-T Controls Products Include:

High Performance Butterfly Valves; Resilient Seated Butterfly Valves; Trunnion Mounted Ball Valves; Pig Valve Dual Valve; Isolation Valve Assemblies; Cryogenic Ball Valves; Lined Ball Valves; Tank Bottom Valves; Electric Actuators; Spring Return Electric Actuators; Fail Safe Electric Actuators; Heavy Duty Actuators; Pneumatic Scotch Yoke Actuators; Pneumatic Rack & Pinion Actuators; 180ยบ Pneumatic Actuators; Stainless Steel Pneumatic Actuators; Declutchable Gear Operators; Gear Operators; Limit Switches; Solenoids; Positioners.


For more information, contact Piping Specialties, Inc / PSI Controls. Call them at 800-223-1468  of visit their website at