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Modulating control valves each with 4-20mA I to P converter linked to pneumatic a valve positioner controlling a diaphragm actuator. An air-operated valve, also known as a pneumatic valve, is a type of power-operated pipe valve that uses air pressure to perform a function similar to a solenoid.
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure , temperature , and liquid level.
Air (or other gas) pressure is the power source for pneumatic valve actuators. [1] They are used on linear or quarter-turn valves. Air pressure acts on a piston or bellows diaphragm creating linear force on a valve stem. Alternatively, a quarter-turn vane-type actuator produces torque to provide rotary motion to operate a quarter-turn valve.
Pneumatics uses compressed air as a drive medium. The company manufactures cylinders, [4] valves, valve systems, [5] as well as units for compressed air preparation and is increasingly focusing on electronic networking of system parts. Vacuum technology for non-contact transport systems, such as those used in the food industry [6] is an ...
Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves and diaphragm valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used. Control valves can also work with hydraulic actuators (also known as ...
In addition to air horns, Leslie Controls manufactures control valves, shutoff valves, control instrumentation, steam conditioning systems, steam water heaters and regulators. [2] Leslie has a service center located in Tampa, which remanufactures valves made by a number of major companies.