ISA TR75.25.02
Control Valve Response Measurement from Step Inputs
Organization: | ISA |
Publication Date: | 1 January 2000 |
Status: | inactive |
Page Count: | 40 |
scope:
This technical report applies to throttling control valves in closed loop control applications. The concept has some application to open loop control applications. It does not address control valves used in on-off control service. The "control valve" in the context of this document includes the following components:
Valve: A valve is a device used for the control
of fluid flow. It consists of a fluid containing valve body
assembly, one or more ports between connection openings and a
moveable closure member, which opens, restricts or closes the
port(s) (see ANSI/ISA-75.05.01-20
Actuator: An actuator is a device that supplies
the force and causes the movement of the valve closure member.
Commonly these are fluid or electrically powered (see
ANSI/ISA-75.05.01-20
Motion conversion mechanism: A mechanism installed between the valve and the power unit of the actuator to convert between linear and rotary motion where required. The conversion may be from linear actuator action to rotary valve operation or from rotary actuator action to linear valve operation.
Accessories: Additional devices used in the
operation of the control valve. As described in
ANSI/ISA-75.05.01-20