1 Design Standards & Compliance
The sight glass valve is engineered in full compliance with recognized industry standards:

• Valve body design: ASME B16.34 (pressure-temperature ratings)

• End connections: ASME B16.5 (flanged), ASME B1.20.1 (threaded), or EN 1092-1

• Pressure testing: API 598 (seat and shell leak tests)

• Sight glass materials: DIN 8902 / DIN 7080 (borosilicate glass), BS 3463 (glass for pressure vessels)

• Supplementary certification: PED 2014/68/EU, ATEX (on request for hazardous areas)

• Pipe system compatibility: designed to meet ASME B31.3 process piping requirements

2 Construction & Materials

• Body & bonnet: precision cast or forged ASTM A216 WCB carbon steel, ASTM A351 CF8/CF8M stainless steel, or duplex/special alloys

• Seat & seal: PTFE, reinforced PTFE, graphite, or metal seat to suit media and temperature

• Sight glass (window): tempered borosilicate glass (DIN 8902), soda-lime glass, or quartz glass for extreme thermal/chemical conditions

• Gasket & cushion: non-asbestos fiber, spiral-wound graphite, or PTFE envelope gaskets

• Surface protection: anti-corrosion paint (carbon steel), passivation (stainless steel)

3 Technical Specifications

• Nominal size: DN15 to DN300 (½″ – 12″)

• Pressure class: Class 150 to Class 900 (PN16–PN160) per ASME/EN ratings

• Temperature range: -50 °C to +300 °C (up to 500 °C with quartz glass and graphite seals)

• Window configuration: single-glass or double-glass safety design; optional drip-tube or wiper for condensate/buildup

• Valve type: ball, globe, or plug mechanism integrated with sight glass; available in full bore or reduced bore

4 Typical Applications

• Chemical & petrochemical: visual monitoring of reactive fluids, solvents, or intermediates

• Pharmaceutical & food: hygienic grade valves for product clarity checks (FDA-compliant seals/glass on request)

• Water & wastewater: check flow turbidity, detect air bubbles or debris

• Steam & condensate systems: low-point drain valves with sight glass for condensate visibility

• Hydraulic & lubrication oil circuits: oil flow confirmation and contamination inspection

5 Installation & Maintenance Notes

• Install with window facing a safe, accessible viewing angle; avoid bending or torsional stress on the valve body.

• Ensure glass is not subject to thermal shock: heat gradually above 120 °C when using borosilicate glass.

• Periodically inspect glass for scratches, clouding, or erosion; replace gaskets and glass as per site conditions.

• Tighten flange bolts in a crisscross pattern to the torque specified in the IOM manual.

• For toxic or high-risk media, a double-glazed safety window with a leak-detection port is recommended.