AVC Control valves or proportional valves are power-operated devices used to modify fluid flow or pressure rate in a process system. These valves are used throughout industry in many applications. Control valves types include globe, diaphragm, pinch, knife or gate, needle, butterfly, ball, and plug.
Butterfly valves are quick opening valves that consist of a metal circular disc or vane with its pivot axes at right angles to the direction of flow in the pipe, which when rotated on a shaft, seals against seats in the valve body. They are normally used as throttling valves to control flow. Ball valves provide tight shut-off and characterizable control. They have high rangeability due to the design of the regulating element, without the complications of side loads typical of butterfly or globe valves. Plug control valves, also called cock or stop-cock valves, date back to ancient times, where they were developed for use in citywide Roman plumbing systems. Today, they remain one of the most widely used valves for both on/off and throttling services.
There are many choices for end configuration on control valves. These include threaded, socket-weld or buttweld, push on, solder end, clamp, grooved end, flangeless wafer-style, lugged, mechanical joint, and flanged. Valve actuation methods for control valves include electric, pneumatic, hydraulic, and manual. Seat features include metal-to-metal, o-ring or soft seat, Class IV or V, and Class VI. Control valves may configure to ANSI standards, API standards, MSS specifications, UL listings, ASME standards, and Federal specification WW-V-35C. Check with manufacturer for exact listings. Some control valves may come configured as a multi-piece design. Common applications for control valves include general purpose, process control, oil or fuel, sanitary, wastewater, water, irrigation, gas or air, steam, fire service, cryogenic, refrigeration, chemicals, and laboratory or medical.
All of AVC Valves are designed,manufactured and tested to API,ASME,ANSI,JJS,DIN and BS standards.