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Design Features
Construction

The Alma Piston Digital Control Valve basically consists of a spring loaded piston, sliding in the guide liner, and two solenoid valves. Piston chamber formed between the liner and the piston top, is connected to the upstream and downstream pressures by normally open (NO) and normally closed (NC) solenoid valves respectively.

Digital Control

When the Piston Digital Control Valve is used with an electronic batch controller, it can be digitally controlled by operating the solenoid valves through any of these three stages :

  • When NO and NC solenoids are energised, the valve opens gradually.
  • When NO solenoid is de-energised (keeping NO solenoid energised), the valve locks at its current position.
  • When NO and NC solenoids are de-energised, the valve closes gradually.
Options
  • The Piston Digital Control Valve can be supplied with external stem and limit switches. Signals from the switches can be used monitor the flow rate(s) and/or to indicate the valve position - open or closed.
  • Standard valve is supplied with 230 V AC solenoids, other voltage solenoids can be supplied on request.

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