Study bench of a control valve

MP135

DEMANDER UN DEVIS POUR CETTE MACHINE

Non contractual photo

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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