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Products  |  Process Engineering  |  Components and Calibration  |  RT 390
RT 390 Test Stand for Control Valves Show data sheet (pdf file) Print page
Technical Description

  Control valves are key components of process engineering systems. They act as an actuator and create a link between the controller and the system. Control valves are generally used for regulating flows of gases or liquids. Optimum control loop design depends on a sound knowledge of control valve behaviour as well as knowledge of the controlled system response.
  The mobile test stand permits investigation and testing of different control valve models. A water circuit with a pump and tank is provided for this analysis. Connections permit integration of the valve under test into the water circuit. The flow rate is adjusted by a gate valve and recorded by an electromagnetic flow rate sensor. Two pressure sensors are used to measure the pressure upstream and downstream of the control valve.
  The supply pressure for electro-pneumatic valves can be adjusted by a pressure regulator on the switch cabinet. The manipulating variable can be set on potentiometers as a current signal. The position feedback from the valve is also returned as a current signal. Motorised valves are actuated by way of pushbuttons. A resistance teletransmitter measures the valve stroke.
  Data acquisition software can be used to plot and evaluate valve characteristics and step responses on a PC in a user-friendly way.
    The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

Together with control valves RT 390.01 - RT 390.06

- demonstration and functional testing of control

- determination of Kv and Kvs values
- plotting valve characteristics
- dynamic response of control valves
  * plotting step responses
- influence of supply pressure on pneumatically

  operated valves
- maintenance and adjustment


* Design and function of control valves1
* Determination of Kv and Kvs values1
* Data acquisition software to plot valve

  characteristics and step responses

Available accessories
RT 390.01 -- Control Valve, Pneumatic, Kvs 2,5, Equal-Percentage
RT 390.02 -- Control Valve, Pneumatic, Kvs 1,0, Equal-Percentage
RT 390.03 -- Control Valve, Pneumatic, Kvs 2,5, Linear
RT 390.04 -- Control Valve, Pneumatic, Kvs 1,0, Linear
RT 390.05 -- Control Valve, Electric, Kvs 2,5, Equal-Percentage
RT 390.06 -- Control Valve, Electric, Kvs 1,0, Equal-Percentage
Alternative products
RT 304 -- Calibration Trainer
RT 310 -- Calibration Station

[1] investigation and testing of control valves
[2] water circuit with tank, pump and connections for control valves
[3] electromagnetic flow rate sensor
[4] 2 pressure sensors to measure the pressure drop over the control valve
[5] gate valve to adjust the flow rate
[6] potentiometer to actuate electro-pneumatic valves with a current signal
[7] pushbuttons to actuate motorised valves
[8] manometer and pressure regulator to adjust the working pressure for electro-pneumatic valves
[9] position feedback via current signal (electro-pneumatic valves) or resistance teletransmitter (motorised valves)
[10] LabVIEW software for data acquisition via USB under Windows XP or Windows Vista

Technical Data

Tank: approx. 90L
Two-stage centrifugal pump
- max. head: 20m
- max. flow rate: 4m/h
- DC: 4...20mA
- resistance: 0...1.000 Ohm
Auxiliary power
- AC: 24V
- supply pressure: 0...10bar
Measuring ranges
- flow rate: 0...5.000L/h
- pressure (water): 2x 0...6bar
- supply pressure: 0...10bar


Dimensions and Weight
LxWxH: 1.250x750x1.500mm
Weight: approx. 150kg
Required for Operation
230V, 50Hz, 1 phase
Compressed air connection required
Scope of Delivery

1 trainer

1 set of hoses
1 LabVIEW software CD + USB cable
1 set of instructional material

Order Details
080.39000  RT 390  Test Stand for Control Valves
© 2005 G.U.N.T. Gerätebau GmbH