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Introduction to Control Valve
editBy definition, valves are mechanical devices specifically designed to direct, start, stop, mix, or regulate the flow, pressure, or temperature of a process fluid. Valves can be designed to handle either liquid or gas applications.
By nature of their design, function, and application, valves come in a wide variety of styles, sizes, and pressure classes. The smallest industrial valves can weigh as little as 1 lb (0.45 kg) and fit comfortably in the human hand, while the largest can weigh up to 10 tons (9070 kg) and extend in height to over 24 ft (6.1 m). Industrial process valves can be used in pipeline sizes from 0.5 in [nominal diameter (DN) 15] to beyond 48 in (DN 1200), although over 90 percent of the valves used in process systems are installed in piping that is 4 in (DN 100) and smaller in size. Valves can be used in pressures from vacuum to over 13,000 psi (897 bar).
Valves can be manufactured from a number of materials, with most valves made from steel, iron, plastic, brass, bronze, or a number of special alloys.
Today’s spectrum of available valves extends from simple water faucets to control valves equipped with microprocessors, which provide single-loop control of the process.
The most common types in use today are gate, plug, ball, butterfly, check, pressure-relief, and globe valves.
Contributed By: jacob paul
Source: The Valve Handbook-2nd Edition/Philip Skousen/McGrawhill/2004 —Preceding unsigned comment added by 192.234.51.1 (talk) 10:49, 11 October 2008 (UTC)
What is a Control Valve?
editThe control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point. The control valve is a critical part of the control loop. Many people who talk about control valves are really referring to a control valve assembly. The control valve assembly typically consists of the valve body, the internal trim parts, an actuator to provide the motive power to operate the valve, and a variety of additional valve accessories, which can include s, transducers, supply pressure regulators, manual operators, snubbers, or limit switches.[1] — Preceding unsigned comment added by FisherValves (talk • contribs) 14:51, 18 April 2018 (UTC)
Terminology
editAnother Wikipedia article on the topic [1] is much shorter, but notes that a "hydraulic actuator" (used in this article) is also called a "hydraulic pilot" (not mentioned here). Such factoids would be useful as I attempt to understand a repairman's "summary of work performed" (He attempted to "adjust...pilot valve, poor response." and replaced the ACV. A year later, another guy says the ACV needs replacement.).
I'd also like to understand what prevents these things from chattering/oscillating rapidly, as it seems opening the valve could lead to immediate closure, leading to... Captain Puget (talk) 23:57, 9 September 2022 (UTC)
References