DUNGS Valve Monitoring System VDK 200 A Series

The VDK is a valve proving system for safety shutoff valves. It verifies that both safety shutoff valves in a gas train are fully closed before a system start-up or after system shutdown when wired and interlocked to a suitable flame safeguard control. The VDK will halt the start-up sequence and prevent ignition when the VDK detects an open automatic shutoff valve or valve leakage exceeding the detection limit.

The VDK is recommended for industrial and commercial heating applications. Some authorities having jurisdiction accept the VDK in lieu of “proof of closure” when integrated with the preignition system and/or in lieu of a vent valve when it checks the valves at start up and shut down. It can also be used as a valve seat tightness check when used within its capabilities. The VDK is suitable for dry natural gas, propane, butane, air and inert gases. Not suitable for hydrogen gas. A “dry” gas has a dew point lower than +15 °F and its relative humidity is less than 60 %.

  • Max. test volume 0.7 ft3
  • Release Signal Timing: (approx. 26 s for RUN and 32 s for ALARM)
  • “RUN” or “ALARM” indicated by a light.
  • Electrical connection at screw terminals via 1/2“ NPT conduit connection.
  • Detectable leakage rate: < 1.76 ft3/hr
  • Field adjustable needle valve to accommodate various pipe volumes.

*Formerly Model ~ VDK 200 A S02 may be used with any other valve whose tightness in counter-flow direction excludes by construction a leakage in flow direction.

The VDK 200 A S02 is suitable for all DUNGS valves according to EN 161 Class A and its’ suitable for gases of gas families 1, 2, 3 and other neutral, technical burnable gases. The VDK 200 A S02 is the compact valve monitoring system as per EN 1643 for automatic shut-off valves:

  • Device operates independent of inlet pressure
  • Test volume ≤ 20 l
  • Setting possible on site
  • The complete test procedure is defined
  • Release time: max. 26 s
  • Tightness or leaks are displayed by an LED
  • Suitable for TRD systems
  • Electrical connection at screw terminals via PG 11 cable entry
  • Operating pressure: 360 mbar

Model Versions :

  • VDK 200 A S02 : Valve proving system for automatic shut-off valves as per EN 161, Class A
  • VDK 200 A S06 : Valve proving system for automatic safety shutoff valves.


* * For other configuration, spare-part or products details, please consult JATI