Products > Control Valves
A Control Valve is a device capable of modulating
flow at varying degrees between minimal flow and full capacity in
response to a signal from an external control device. In a process
control loop, an Electronic Controller and Sensor is used in conjunction with a Control Valve to
maintain a process variable at a desired set point. The controller
compares the sensor signal to the set point and outputs the appropriate
response signal to the control valve. The control valve will then
modulate to provide the flow response required to maintain the process
variable at the set point. In the case of a pneumatic control valve
such as the W910 Series, a current-to-pressure (I/P)
transducer is required to convert the electrical signal from the
controller to the air pressure signal needed to operate the pneumatic
valve. Watson McDaniel is unique in its ability to provide all the
necessary components to create a complete control loop.
The Watson McDaniel W910 Series Pneumatic Control
Valve offers high quality at an economical price and
incorporates many features found only on more expensive units. A variety
of models are available to provide the flow response required by the
application.
In addition to the control valve, Watson McDaniel also
offers the following control loop components: The TR890 Series
Electronic PID Controller, the TA901 Electropneumatic
(I/P) Transducer, the TJD/TKD Thermocouple Temperature
Sensors and the TDD/TMD RTD Temperature Sensors.
The TA987 Air Filter/Regulator is available for
filtering and regulating plant compressed air for providing clean, dry
air at the proper pressure to the W910 Series Pneumatic Control Valve. A
variety of Thermowells are available to protect and
isolate the temperature sensor stems from the process fluid.
Products > Control Valves
Product Catalog -
Direct-Operated Pressure & Temperature Regulators