Verified 22 September 2026

Stainless-steel process sight glass DN80 PN16 manufacturers in China

Stainless-steel DN80 PN16 process sight glass manufacturers supply flanged sight-glass windows and flow indicators for pipelines and tanks; buyers should look for makers that specify flange standard/DN, pressure rating (PN16), stainless grade, and glass type. For sourcing in China, verify factory production claims, material certificates and flange/pressure standards before requesting quotes.

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6 verified manufacturers

  • Kaixin Pipeline Technologies Co., Ltd.China

    ““As Sight Glass manufacturers and suppliers in China, Kaixin Pipeline Technologies Co., Ltd. provide customized Sight Glass services.” (plasticpipevalve.com product page)”

  • BCSTChina

    ““BCST is the leading sight glass flow indicator manufacturer in China and has been working in the production industry since 2000.” (bcstgroup.com sight-glass page)”

  • FanovoChina

    “Fanovo supplies stainless-steel sight glass models rated PN16 and offers stainless-steel sight glass product listings. (fanovo.com product category)”

  • KosunChina

    ““As one of the leading stainless steel dn50 flange type tank sight glass manufacturers in China, our factory provides bulk stainless steel and sanitary products.” (kosuncn.com sightglass product page) — company presents itself as a Chinese sight-glass manufacturer (DN50 example; relevant to DN flange sight glasses).”

  • Cangzhou Puhang Pipeline Manufacturing Co., LtdChina

    “Named in a China sight glass manufacturer ranking: “The top 10 Sight Glass manufacturers in China for 2026 are: Cangzhou Puhang Pipeline Manufacturing Co., Ltd ...” (b2bdata.aipage.com snippet)”

  • Zhejiang Kekong Pump Valve Co.China

    “Named in a China sight glass manufacturer ranking: “The top 10 Sight Glass manufacturers in China for 2026 are: ... Zhejiang Kekong Pump Valve Co., ...” (b2bdata.aipage.com snippet)”

Compiled from public sources and refreshed periodically. Always verify certifications and capabilities directly with the manufacturer before ordering.

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What to specify in your RFQ

Manufacturers quote faster and more accurately when your request covers these points.

  • Nominal diameter

    Specify DN (e.g., DN80) so the supplier quotes the correct flange size and window diameter.

  • Pressure rating / flange standard

    Specify PN (e.g., PN16) and flange standard (EN 1092-1 / DIN / ANSI) to match mating pipe flanges and pressure requirements.

  • Body and glass materials

    State stainless-steel grade (304/316/316L or special alloys) and glass type (borosilicate, toughened, laminated) required for media compatibility.

  • Connection type and face-to-face length

    Choose flanged, threaded or sanitary connections and give required bolt pattern or face-to-face dimension if non-standard.

  • Internal indicator type

    Specify whether you need plain sight glass, ball/flapper/rotor indicator, illumination or paddle for flow indication.

  • Operating conditions

    Provide operating temperature, pressure swings, vacuum or corrosive media details that affect seals and material selection.

  • Quantity and delivery expectations

    State required quantity, any batch delivery schedule and desired lead time to get accurate pricing and production planning.

  • Documentation & testing

    Request material certificates (EN/ASTM), pressure test reports and inspection/photo evidence as part of the quote.

Sourcing FAQ

How do I verify a Chinese sight-glass manufacturer?
Ask for factory photos, recent inspection reports, material certificates (e.g., EN/ASTM for stainless steel), pressure test records and sample photos; if possible, request references or client examples of similar DN80 PN16 items.
What typical minimum order quantities (MOQs) should I expect?
MOQs vary by supplier and whether the item is standard or customized; standard flanged sight glasses often have low MOQs, while customized materials or indicators increase MOQs—confirm MOQ when requesting a quote.
Which certifications or documents matter for process sight glass?
Important documents include material certificates (traceable stainless-steel grade), pressure test reports, conformity to flange/pressure standards (EN/DIN/ANSI) and, for sanitary use, surface finish or hygienic certifications.
What drives lead time for DN80 PN16 sight glasses?
Lead time is driven by material availability (special alloys), glass type and tempering, internal indicator customization, testing requirements and order quantity; ask suppliers for separate lead times for samples and bulk production.

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