We offer a complete series of stainless steel sight glass models, including double window sight glasses, bull’s eye sight glasses, sanitary tank sight glasses, flange type sight glasses, threaded pipeline sight glasses. Materials cover SUS304 and SUS316L stainless steel. We support multiple connection ends: NPT thread, tri-clamp sanitary connection, RF flange, weld ends. Products are widely used for pipeline flow observation, tank liquid level monitoring in sanitary, chemical, water treatment and industrial fluid systems. Custom sizes and pressure rating options are available upon request.
Standard models are rated PN16 (16 bar working pressure). High-pressure customized versions up to PN25 / PN40 are available. The borosilicate sight glass window supports continuous working temperature from -20°C up to 200°C. If your working medium involves extreme temperature or rapid temperature changes, we can supply tempered safety glass options to reduce the risk of cracking. We will confirm all operating parameters before production to match your working conditions.
Yes, custom manufacturing is one of our core services. We can produce non-standard sight glasses based on your technical drawings, sample dimensions, special flange standards (ANSI, DIN, GB), unique size requirements, special surface finishing or modified installation structures. Our engineering team reviews drawings for pressure safety and structural rationality before quotation. MOQ for customized items can be negotiated.
Yes. We can supply independent spare parts including borosilicate glass panels, PTFE / silicone sealing gaskets, fastening bolts. If you only need replacement windows or gaskets for existing sight glass units, you can send us the size specifications or old samples. It helps you reduce maintenance costs without purchasing complete new sight glass assemblies.
For general industrial models, we provide matte sandblasting finish. For sanitary food, beverage, pharmaceutical applications, we supply internal and external mirror polishing (Ra ≤0.8μm) to avoid medium residue. We can also provide brushed finish as requested. All polished stainless steel bodies effectively resist corrosion when handling water, weak acid and weak alkaline fluids.
Our stainless steel sight glasses comply with common industrial pressure equipment standards. Material test certificates (MTC) for SUS304/SUS316L stainless steel can be provided. For sanitary grade sight glasses, we support documentation suitable for food and hygienic industry inspection. If you need specific third-party certification for your local market, please inform us in advance so we can arrange accordingly.
Stainless steel sight glasses are widely adopted across multiple sectors: food & beverage processing, pharmaceutical production, water treatment systems, chemical pipelines, oil & gas auxiliary pipelines, heating boiler systems, brewery equipment, cosmetic manufacturing and general industrial fluid control lines. They allow operators to visually check fluid flow status, liquid level, mixing conditions inside enclosed pipes and tanks without system shutdown.
Standard gasket material is PTFE, which features great chemical resistance. Silicone gaskets are recommended for sanitary and high-temperature food-grade working conditions. We also provide EPDM and Viton gaskets for special medium such as oils and solvents. You need to inform us your fluid medium and operating temperature, so we can recommend the most suitable sealing material to prevent leakage.
For standard in-stock sight glass models, we can arrange shipment within 3–7 working days. For regular mass production orders, the lead time is 15–25 working days. Custom engineered sight glasses based on drawings normally take 25–35 working days. We will confirm exact production schedules at the time of quotation. If you have tight delivery deadlines, contact us to discuss feasible arrangements.
During installation, evenly tighten bolts diagonally to avoid uneven stress that breaks the glass window; do not apply excessive torque. Avoid sudden violent impact on the glass panel during operation. Regularly inspect gaskets for aging and replace them periodically. If the glass surface gets dirty, clean with soft cloth and neutral detergent. Do not use hard abrasive tools to scratch the glass. Avoid rapid extreme temperature shock to prolong the service life of sight glass windows.
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