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    1 explosion proof and anti corrosion series

    Explosion-Proof & Anti-Corrosion Sight Light Series

      • arrow BL901-1 Series
      • arrow BL401-3 / BL401-3D Series
      • arrow BL301-2 Series
      • arrow Standard Protective Series
    2 mental fused series

    Fused Sight Glass Series

      • arrow Fused Clamp Sight Glass & Flanged Sight Glass
      • arrow Fused Sight Glass Lights & Manways
    3 conventional sight glass light series

    Standard Sight Glass light Series

      • arrow BL101-1 / BL101-2 Sight Glass Lights
      • arrow BL701-1 / BL801-1 Sight Glass Lights
      • arrow Clamp-type Sight Glass with Integrated Light
      • arrow BL201-12 series Tank Top Light
      • arrow BL401-1 Series
      • arrow Sandblasted BL102-9, BL102-12
      • arrow Sandblasted BL302-9, BL402-9
      • arrow Sandblasted Series BL502-9
    4 sight glass series

    Standard Sight Glass Series

      • arrow Standard Sight Glasses
      • arrow Flange sight glass
      • arrow Union Sight Glass
      • arrow Long Strip Sight Glass
    5 pipe sight glass series

    Sanitary Pipeline Sight Glasses

      • arrow Sanitary Pipe Sight Glasses
      • arrow Sanitary Grade Spherical Pipeline Sight Glass
      • arrow Sanitary Grade Four-way Pipeline Sight Glass
    6 flange & blind plate series

    Flanges & Blind Plates Series

      • arrow Flanges & Blind Plates
    7 valve series

    Sanitary Butterfly Valves

      • arrow Sanitary Butterfly Valves
    8 manhole series

    Sanitary Manway Series

      • arrow Sanitary Manways
    8 liquid level gauge series

    Level Gauge Series

      • arrow Level Gauges
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integrated circular sight glass installed on a stainless steel process vessel
22 Oct
Technical Insights
Posted by Borlan Fluid
10.10.2026

What Is a Fused Sight Glass and How Does It Reduce Leakage Risk?

What Is a Fused Sight Glass and How Does It Reduce Leakage Risk? Every joint in a process observation window has a job to do—and eve...
Continue reading
technician comparing annular gasket options beside a stainless steel sight glass assembly
16 Oct
Technical Insights
Posted by Borlan Fluid
10.10.2026

Sight Glass Gasket Materials Explained: PTFE, EPDM, Silicone, and FKM

Sight Glass Gasket Materials Explained: PTFE, EPDM, Silicone, and FKM A sight glass can have a carefully selected viewing window and...
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process engineer checking gauges and temperature at a stainless steel vessel sight glass containing amber liquid
10 Oct
Technical Insights
Posted by Borlan Fluid
10.10.2026

How Pressure, Temperature, Vacuum, and Media Affect Sight Glass Selection

A sight glass is both an observation window and part of the process boundary. Its metal body, transparent window, gaskets, fasteners, a...
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engineer comparing clamp, union, and flanged stainless steel sight glass connections on a vertical process equipment test skid
29 Sep
Technical Insights
Posted by Borlan Fluid
29.09.2026

Clamp, Union, or Flange? Choosing the Right Sight Glass Connection

Clamp, Union, or Flange? Choosing the Right Sight Glass Connection The connection is one of the first sight glass decisions, but the...
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technician using a handheld alloy analyzer to verify a stainless steel sight glass body in a manufacturing inspection area
23 Sep
Technical Insights
Posted by Borlan Fluid
23.09.2026

304 vs. 316L Stainless Steel for Sight Glass Assemblies

304 vs. 316L Stainless Steel for Sight Glass Assemblies Stainless steel is widely used for sight glass bodies, flanges, unions, clam...
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sanitary stainless steel pipeline sight glass beside a robust industrial vessel sight glass in a clean process plant
16 Sep
Technical Insights
Posted by Borlan Fluid
16.09.2026

Sanitary vs. Industrial Sight Glasses: What Is the Difference?

Sanitary vs. Industrial Sight Glasses: What Is the Difference? A sight glass gives operators a direct view of liquid level, flow, co...
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borlanfluidindustrial sight glass types explainedunion flanged tubular strip and fused designs
08 Sep
Technical Insights
Posted by Borlan Fluid
08.09.2026

Industrial Sight Glass Types Explained: Union, Flanged, Tubular, Strip, and Fused Designs

Industrial Sight Glass Types Explained: Union, Flanged, Tubular, Strip, and Fused Designs The term “industrial sight glass” covers p...
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select industrial tank sight glass borlanfluid
06 Aug
Technical Insights
Posted by Borlan Fluid
06.08.2026

How to Select the Right Sight Glass for an Industrial Tank: 9 Parameters to Confirm

How to Select the Right Sight Glass for an Industrial Tank: 9 Parameters to Confirm An industrial tank sight glass looks simple: a m...
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bl901 1 sintered clamp tank top sight light
23 Jul
Technical Insights
Posted by Borlan Fluid
23.07.2026

Sintered vs. Standard Wetted Surface: Choosing the Right BL901-1 Tank Top Sight Glass

In sanitary processing industries, every detail that comes into contact with the product matters. For tanks used in food, beverage, pha...
Continue reading
na connection fused sintered flange sightglass
08 Jul
Technical Insights
Posted by Borlan Fluid
08.07.2026

Case Study: Engineering a 30 MPA Custom Sintered Sight Glass for a German University Laboratory

At Wenzhou Borlan Fluid Machinery, we thrive on engineering challenges. While we manufacture a wide range of standard sanitary valves a...
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Latest articles

  • integrated circular sight glass installed on a stainless steel process vessel
    What Is a Fused Sight Glass and How Does It Reduce Leakage Risk?
    22.10.2026 No Comments
  • technician comparing annular gasket options beside a stainless steel sight glass assembly
    Sight Glass Gasket Materials Explained: PTFE, EPDM, Silicone, and FKM
    16.10.2026 No Comments
  • process engineer checking gauges and temperature at a stainless steel vessel sight glass containing amber liquid
    How Pressure, Temperature, Vacuum, and Media Affect Sight Glass Selection
    10.10.2026 No Comments
  • engineer comparing clamp, union, and flanged stainless steel sight glass connections on a vertical process equipment test skid
    Clamp, Union, or Flange? Choosing the Right Sight Glass Connection
    29.09.2026 No Comments
  • technician using a handheld alloy analyzer to verify a stainless steel sight glass body in a manufacturing inspection area
    304 vs. 316L Stainless Steel for Sight Glass Assemblies
    23.09.2026 No Comments

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    • Explosion-Proof & Anti-Corrosion Sight Light Series
    • Fused Sight Glass Series
    • Standard Sight Glass Series
    • Standard Sight Glass light Series
    • Sanitary Pipeline Sight Glasses
    • Flanges & Blind Plates Series
    • Sanitary Butterfly Valves
    • Sanitary Manway Series
    • Level Gauge Series

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  • Email: jzxiang1992@gmail.com
  • Phone: +86-16657273263
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  • Address: Wenzhou Borlan Fluid Tech Co., Ltd. No. 568-B, Xingrong Road, Longwan District, Wenzhou, Zhejiang Province, China

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  • Home
  • Products
    • Explosion-Proof & Anti-Corrosion Sight Light Series
      • BL301-2 Series
      • BL401-3 / BL401-3D Series
      • BL901-1 Series
      • Standard Protective Series
    • Fused Sight Glass Series
      • Fused Clamp Sight Glass & Flanged Sight Glass
      • Fused Sight Glass Lights & Manways
    • Standard Sight Glass light Series
      • BL101-1 / BL101-2 Sight Glass Lights
      • BL701-1 / BL801-1 Sight Glass Lights
      • Clamp-type Sight Glass with Integrated Light
      • BL201-12 series Tank Top Light
      • BL401-1 Series
      • Sandblasted BL102-9, BL102-12
      • Sandblasted BL302-9, BL402-9
      • Sandblasted Series BL502-9
    • Standard Sight Glass Series
      • Standard Sight Glasses
      • Flange sight glass
      • Union Sight Glass
      • Long Strip Sight Glass
    • Sanitary Pipeline Sight Glasses
      • Sanitary Pipe Sight Glasses
      • Sanitary Grade Spherical Pipeline Sight Glass
      • Sanitary Grade Four-way Pipeline Sight Glass
    • Flanges & Blind Plates Series
      • Flanges & Blind Plates
    • Sanitary Butterfly Valves
      • Sanitary Butterfly Valves
    • Sanitary Manway Series
      • Sanitary Manways
    • Level Gauge Series
      • Level Gauges
  • About Us
  • News
  • Contact Us
  • English
    • العربية
    • Español
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