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W30 Gauge Valves

Series W30 Gauge valves are recommended for use with Wellmark’s Series W20 Visual Level Indicators and are compatible with all industry standard, armored flat-glass liquid level gauges. Plain/Union and Union/Union connections make for easy installation and removal.

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W30 Gauge Valves


  • Equipped with stainless steel ball check upstream of the seat to shut off flow in case of Level Indicator glass breakage.
  • Indicator Union Connection to allow top and bottom connected Indicators to be rotated to any angle visibility and allows for easy Indicator removal.
  • Gauge Valve and drain connections are offset from the vessel connection centerline for easier Indicator glass cleaning.
  • Materials meet NACE MR0175 specifications.


  • Sight Glass Connection: 1/2″ NPT or Union
  • Tank Connection: 1/2″ and 3/4″ Union

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