Control Valve

The most common final control element in the process control industries is the control valve. The 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, transducers, supply pressure regulators, manual operators, snubbers, or limit switches. There are two main types of control valve designs, depending on the action of the closure member:

1. sliding-stem:

Sliding-stem valves use linear motion to move a closure member into and out of a seating surface.

1. Rotary

Rotary valves use rotational motion to tum a closure member into and out of a seating surface.

FAFCO produce Globe Control Valves for Class I to Class VI of seat tightness in single port or double ports body style, where calculation is based on the ANSI/ISA-75.01.01 (IEC 60534-2).

Type OF Control Valve