Control Valves used in the Chemical Industry

Control Valve Basics

Control valves are valve that operate with the purpose of controlling certain conditions including flow, media, pressure, temperature, and liquid level. They work by either opening or closing in their entire or partial capacity in response to certain criteria. The valve often operates through the use of signals that are programmed to have a set point for a predetermined process variable.

The control valve is made up of three main parts: the actuator, positioner, and body. There are several types and designs, depending on the application.

Control Valves for Chemical Reactions

Because the use of chemicals, especially hazardous ones, is such a precise process, the control valves must often perform to exacting standards. They are generally controlled electronically, hydraulically, pneumatically, and even in some project, manually by trained operators. The valves are used to add a controlled dosage of chemicals to another set at certain levels and under certain circumstances.

In many chemical processing application, control valves must operate in extremely harsh environments. The valves are designed to handle brutal acidic, corrosive, abrasive, and other hazardous conditions and may be required to meet or exceed ASME B16.34 or related specifications.

It is also essential that these valves are well constructed and perform as intended in order to ensure a smooth operational process, avoid damage to surrounding equipmen t from leakage, and most important, to keep hazardous media within the system and safeguard the safety of personnel.

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