Valve Proving System
VDK 200 A S06*

*Formerly VDK 200A S02

Description
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 (see page 5 in datasheet for detection limits).
- 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.

Application
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 %.

VDK 200 A S06 Valve proving system for automatic safety shutoff valves.