ISA TR75.25.02-2000:2001 Edition
$18.20
Control Valve Response Measurement from Step Inputs
| Published By | Publication Date | Number of Pages |
| ISA | 2001-03-11 | 40 |
Full Description
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This technical report applies to throttling control valves in closed loop control applications. The concept
- 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-75.05.01-2000, "Control Valve Terminology"). - 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-75.05.01-2000). Actuators often
use air but other types use electric, hydraulic and electro-hydraulic power. - 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-75.05.01-2000, typical examples include a positioner, transducer, signal booster relay, air set,
snubber, etc.
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:
