Control valves discussed in this section are applicable to throttling control (i.e., where flow through the valve is regulated to any desired amount between maximum and minimum limits). Other valves such as check, isolation, and relief valves are addressed in the next subsection.

Rotary-shaft control valves are available in several different types, each characterized by the geometry of the closure member (disk, ball, ball segment or plug). Compared to sliding-stem valves, rotary-shaft valves typically have limited pressure drop ratings, are less expensive, have greater range

Control Valve is the terminology used to a throttling valve which has the ability, or the gradual changing. Is on-off valve including valve controlled? Yes, but rarely referred to as the control valve.

The opening or closing of control valves is done by means of electrical, hydraulic or pneumatic systems. Positoners are used to control the opening or closing of the actuator based on Electric, or Pnuematic Signals.

The most common linear stem-motion control valve is the globe valve. The name comes from the globular shaped cavities around the port. In general, a port is any fluid passageway, but often the reference is to the passage that is blocked off by the closure member when the valve is closed. In globe va

The most common and versatile types of control valves are sliding-stem globe and angle valves. Their popularity derives from rugged construction and the many options available that make them suitable for a variety of process applications.

Piping valves originally designed as isolation (on-off) valves posing as control valves are the biggest culprit. A precision of 4% and a deadband of 8% have been observed for butterfly valves and ball valves designed for tight shutoff.

A control valve regulates the flow or pressure of a fluid. Control valves normally respond to signals generated by independent devices such as flow meters or temperature gauges.