W20 Sight Glass Visual Level Indicator and W30 Gauge Valves
The Series W20 is a one-piece chamber general purpose, rugged flat glass gauge for mid-range pressure temperature applications. Standard construction includes a solid one-piece chamber machined from carbon steel with carbon steel covers, toughened glass, and plated carbon steel bolts and nuts. All metal parts are rustproofed, and a recessed gasket seat prevents movement, insuring leak-free service.

Features
- Available in 9 standard glass sizes
- Constructed with multiple vision slots for longer size requirements
- Toughened molded glass is resistant to thermal and mechanical shock and made in accordance with BS 3463, DIN 7081
- Quality Assurance Testing: All gauges are hydrostatically tested to 1.5 times the rated pressure at 100°F (38°C)
- Materials conform to NACE MR0175 specifications
- Replaces industry standard level gauges
- Female NPT and Union connections available
- Series W20 Sight Glass and W30 Gauge Valve assemblies available
- Repair kit available upon request
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.

Features
- 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.
Specifications
- Sight Glass Connection: 1/2″ NPT or Union
- Tank Connection: 1/2″ and 3/4″ Union

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