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Study bench of a control valve


Service : 230 V, 50 Hz, 250 W
Compressed air: 6 bar, 3 Nm3 / h
Clean water: 4 bar, 20 C, 1000 L / h.
Dimensions : 850 x 425 x 940 mm

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DEMANDER UN DEVIS POUR CETTE MACHINE

This bench allows the study of the characteristics of a regulating valve with pneumatic servomotor with needle. The concepts of CV and Kvs will be discussed. The valve will be used with or without positioner.

A pneumatic servomotor valve is supplied via the water supply via a needle valve. The flow is measured by a float flow meter. An expansion valve adjusts the pressure of the supply network.
The pressure difference between upstream and downstream of the control valve is measured using a differential pressure transmitter with local display.
The influence of the positioner on the response of the valve is determined by means of a current generator (4 to 20 mA) allowing the actuator of the control valve to be controlled via an I / P converter or via an electro- pneumatic positioner.
The device is mounted on a welded stainless steel frame.




Educational Objectives :
  • Determination of the experimental Kvs of the valve with and without positioner.
  • Drawing and study of the curves:
  • Intrinsic characteristics of the valve Qv = f (control) with constant pressure drop.
  • Characteristic of the installed valve: Qv and ⇔P = f (control).
  • Role of the positioner and hysteresis phenomenon.
Technical specifications :

It's made of :

  • A regulator of the water supply circuit with manometer.
  • A needle flow control valve made of stainless steel.
  • Pneumatic control valve with variable CV in stainless steel.
  • An electro-positioner.
  • A regulator, air de-oiler with manometer.
  • Differential pressure transmitter with local display and purge manifold.
  • A float flowmeter
  • An electrical box, waterproof IP 55, including:
  • A lockable disconnector,
  • A power-on LED,
  • An emergency stop key.
  • A current generator (4 to 20 mA) with potentiometer and indicator,
  • The control signal is brought back to secure cards.
DEMANDER UN DEVIS POUR CETTE MACHINE

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