Control valve & on off valve ,solenoid-valve manufacturer

Close this search box.

Professional Flanged Sight Glass Manufacturer

  • Long working life.
  • No maintenance required.
  • High safety factor tested for safety.
  • High visibility.
  • Robust and light.

Get in Touch with Us

    BCST your Expert Flanged Sight Glass Supplier in China

    The BCST flange sight glass is a see-through window, through which the inside of a process pipe or tank can be seen. It is an important tool used in the process industry to monitor the conditions and levels of fluids and fluids in tanks and pipelines. BCST flange sight glasses are designed to stand up to harsh environments where extreme chemical, thermal, pressure, and mechanical conditions are present.

    BCST flange sight glasses have been used in the industry for years. One of the earliest applications for these instruments was water level gauges in the boilers of steam-powered locomotive engines. They were used to ensure water was maintained at a specific level for operations safety. Within these industries, flange sight glasses find their way into various processing components, including fluid and gas pipe handling, pharmaceutical manufacturing, food and beverage processing, oil and gas manufacturing, and wastewater treatment and management.


    BCST your One-Stop Flanged Sight Glass Solution in China

    BCST can provide you with suitable flanged sight glass you need to revolutionize your business processes and get more done. Contact us and let’s work together. Reach out to one of our experienced engineering teams today, and we’ll find custom-tailored solutions for flanged sight glass  that meet your needs.

    Double window sight glass

    Double Window Sight Glass

    Wheel flanged sight glass

    Paddle Wheel Sight Glass

    tubular flanged sight glass

    Tubular Flanged Sight Glass

    BCST your BEST Supplier for Flanged Sight Glass

    As a leading manufacturer of flange sight glass in China, BCST provides a complete solution for various media. You can rely on BCST to provide technical support for flange sight glass during installation and usage regardless of whether you are an end-user or an engineering company. A wide variety of BCST flange sight glass are used in the process industry. 

    A combination of hardware and software breakthroughs has enabled BCST to create the most advanced and intelligent flange sight glass manufacturing facility in the world. BCST is one of China’s leading valve and process instrument manufacturers. BCST is your one-stop-shop for all your flange sight glass needs worldwide, with ISO certification, fast delivery and a wide product range. 

    Feel free to let us know about any special requirements your business has and we’ll work on coming up with custom solutions for you.

    BCST group

    BCST Flanged Sight Glass Quality Control

    • Technical software caculation
    • Technical team meeting
    • CAD drawing confirmation  


    • Installation
    • Calibration
    • Chemical Analysis
    • Mechanical Propery
    • dimension Checks
    • Visual Checks
    • Non-destruction Examination

    Hydrostatic Test

    • Shell test
    • Sealing test
    • Leakage test
    • Air test
    • Function test
    • CNC machining
    • Visual checks
    • Dimensional checks
    • Liquid penetration test

    Outlook Treatment

    • Surface Polish
    • Painting
    • Visual inspection
    • Thickness checks
    • Visual checks
    • Liquid penetration
    • Test
    • Hardness test
    • Lapping
    • Dimensional checks


    • Marking
    • Exported wooden box

    Get the Latest Catalogue Now!

    Why Purchase Flanged Sight Glass From BCST

    Flanged Sight Glass -FAQ

    What is the benefit of a cut-away or sidewall sealed circular Flanged Sight Glass?

    When you talk about the Flanged Sight Glass windows, you can classify them according to their sealing components. The most usual face-sealed products use glass seal gaskets in the middle of the glass and metal flange as sealing members. So, the force of the flange bolts can break the glass under it. This kind of Flanged Sight Glass is simple and work efficient, but this is also a fact that you can damage glass beneath the flange bolts in case of over-tightening.

    But this is the most popular kind of Flanged Sight Glass because it offers the lowest cast. On the other hand, using sidewall sealed sight windows can reduce the risk of crushing the glass. When you use plastic packing material beside the sidewalls of glass lenses, the pressure of bolts will be on the seal, not directly on the glass. So by using sidewall sealed circular Flanged Sight Glass, you can safely install your Flanged Sight Glass inside your system.

    What should you consider while using Flanged Sight Glass?

    You should always consider the following points while using a Flanged Sight Glass:

    · Maintenance: 

    The maintenance of Flanged Sight Glass is essential when working with a piping system. Remember when you are working with corrosive fluids, i.e., alkaline substances. You should regularly replace the gasket and glass disk; if you feel the chemical influences on Flanged Sight Glass, you should periodically check the sight glass. Certain elements reduce the safety of Flanged Sight Glass which are cloudiness, deformation, and signs of corrosion. If you observe any of the above situations, you should immediately replace the glass. But when you replace the glass disk, you should also replace the inner gasket.

    · Port size:

    When you need a large viewport of Flanged Sight Glass for your system, you will use a comparatively thick glass than the smaller viewport for the same conditions. You should keep the glass size used in Flanged Sight Glass within DIN 7080 because this size is readily available in the market at the shallow cast. And spare parts are also readily available in the market.

    • Gasket material:

    You should select the gasket material according to the operating conditions. If the gasket is not compatible with pressure, temperature, and leakage when you use it—the usual gasket material.

    Commonly the Flanged Sight Glass is made-up of bound armed fibres.

    · Glass material:

    Commonly Flanged Sight Glass is composed of borosilicate glass. It is highly reliable when working with chemicals, i.e., acids. The borosilicate glass used in Flanged Sight Glass can operate at temperatures up to 280˚c to 300˚c. But when working at a temperature higher than 300˚C, you should use sapphire glass because this kind of glassworks well at high temperatures and is scratch-resistant.

    · Material:

    The body of Flanged Sight Glass should be accurate and compatible with pressure, temperature, and fluid.

    Like gasket and glass have, so this is the responsibility of the flanged glass producer to provide the appropriate body of Flanged Sight Glass.

    · Type of connections:

    When you decide to install a Flanged Sight Glass into the piping system, you should select the proper connection type, standard, and size. So you must provide the correct information to the Flanged Sight Glass producer when you give him a request for the quotation.

    · Requirements:

    Some applications can have additional needs, like reduced wake space and more sensor connections for improvement of draining of liquids. And you should also coat the inner surface of Flanged Sight Glass.

    i.e., you can use PTFE to improve chemical strength.

    · Equipment:

    Many of the Flanged Sight Glass have additional features like LED lights, wipers, and spray nozzles, which you can use for cleaning purposes. You can also get a heating system for Flanged Sight Glass.

    What Are the Advantages of plastic Flanged Sight Glass?

    • Many types of glass are used in Flanged Sight Glasswith different abilities, but plastic is also used in Flanged Sight Glass. The plastic is usually shatter-proof. The toughness of the sight glass valve is a crucial safety issue. Some manufacturers do not allow glass or other materials in their process lines because they are concerned about the safety of their customers.  
    • Plastic Flanged Sight Glasses can resist acids, alcohol, etc., usually used in many food processing industries.
    • Plastic Flanged Sight Glassis a fantastic alternative for glass. Some producers offer plastic Flanged Sight Glass windows where they use plastic polymer in metal support rings, which may result in a potent product.
    • Compared to Flanged Sight Glasswhich is made up of glass, plastic sight glass is very inexpensive. That’s why usually used as a fluid level indicator.
    • Plastic Flanged Sight Glasscan be composed of many different shapes. You can easily view the material inside the tank or pipe because the plastic Flanged Sight Glass has one transparent unit installed in the process pipe or tank for use in the viewpoint.

    What are the disadvantages of plastic Flanged Sight Glass?

    • Plastic Flanged Sight Glasshas more restrictions in operating verity. So high grade and plastic solid sight glass melt at higher temperatures. So it’s only suitable at lower temperatures, i.e., below 300˚F.
    • Plastic Flanged Sight Glasses can accept damage and scale more readily than glass. And as time passes, it can lose its transparency.

    How to choose the best Flanged Sight Glass for your system?

    Whenever you decide to buy the best Flanged Sight Glass for your industry but don’t know how to choose the best for your system, you should consider the following points to buy the best.

    · Maximum temperature:

    Keep in mind if you want to purchase the best Flanged Sight Glass, you should buy a Flanged Sight Glass, which contains borosilicate glass because many kinds of glass and plastic are only compatible with the temperature of 300˚F.

    · Corrosion:

    Because of some acidic fluids, your Flanged Sight Glass can be cloudy or less transparent. So, if you want to choose the best, you should select a sight glass that can resist corrosive influences.

    · Check Abrasion:

    If you want the best, you should choose the Flanged Sight Glass, which will accept more minor effects of abrasion; you should check Flanged Sight Glass with the help of ultrasonic equipment.

    · Pressure:

    It would help if you used a Flanged Sight Glass in your system, which can work in high-pressure applications.

    · Adverse impact:

    Some materials can impact Flanged Sight Glass, i.e., food material. It can affect the Flanged Sight Glass walls and windows, and the window can be blurry. So if you want the best, you should replace the flange sight glass on urgent bases.

    What is Dura port see-through fused Flanged Sight Glass?

    The dura port see-through Flanged Sight Glass is a flow indicator. It has the same lens assembly as in dura port weld in units. This kind of Flanged Sight Glass lens is so clear that you can easily distinguish the flow inline. You can also clearly see the colour and clarity of the fluid. This kind of flanged glass is also available with a flapper and drip tube, which will help you to check whether the flow is clear or not.

    You can adapt this kind of Flanged Sight Glass for smaller and larger flanged connections. It all depends on your industrial needs. It is composed of stainless steel or carbon steel material. The gasket used in this Flanged Sight Glass is Teflon or Grafoil or Gylon material. And its glass is composed of borosilicate material.

    Dura port see-through fused Flanged Sight Glass

    What is Slip-on Flanged Sight Glass?

    Slip-on Flanged Sight Glass is a round tank Flanged Sight Glass that you can install on open pipe ends. This type of flanged glass is designed for slip-on connection. The lower flange is welded on the pipe end.

    The outer glass cushion is installed on the top and pressed on the opposite side of the upper flange. The gasket is situated on the media side.

    This kind of Flanged Sight Glass checks the fluid flow and its pressure inside the pipelines and tanks.

    Industrial flanged glass has the best industrial glass, borosilicate, which can work perfectly with many chemicals and resist high temperatures. But for taking best results, you should give it a protective layer of mica. This kind of Flanged Sight Glass flange is composed of stainless steel alloys.

    What are the components of Flanged Sight Glass, and what is their role in the flow system?

    · Glass:

    Another name for the glass you use in Flanged Sight Glass is medium. This glass is transparent and sometimes translucent. The glass is a critical component of Flanged Sight Glass and has an electromagnetic length needed. It is the central operational unit in every Flanged Sight Glass.

    · Body: 

    The body of the glass holds the transparent glass; it is present in all sight glasses. Many commercially used sight windows are away from each other. So, the unit-body holds the transparent glass. It contains the glass and manages the stress transferred to the glass. The unit-body distributes the sealing stress on the glass surface. In other words, you can say that different unit-body designs have different pressure ratings. A unit design is a part of how a unit can manage corrosion protection.

    · Gasket:

    In Flanged Sight Glass, the gasket is always present. It is an essential element of Flanged Sight Glass. It is always present in the system because of the sealing requirement.

    · More features:

    Flanged Sight Glass, which is used to check the condensing process, might be covered with liquid vapours, and because of this, you cannot take the reading or observation. You can use a liquid spray ring or window wiper. Some more features are integrated fittings for particular instruments.

    Who are the manufacturers of Flanged Sight Glass?

    During the last few years, China has become the top manufacturer of Flanged Sight Glass. And in China, BCST is a leading company manufacturing superior quality Flanged Sight Glass. From 20 years. BCST Is a manufacturer and supplier of Flanged Sight Glass. The company is also exporting Flanged Sight Glass to more than 100countries in the world. The Flanged Sight Glass is used to check the presence of fluid, observe different fluids passing through pipelines and tanks, and check the pressure and flow rate inside the pipeline.

    What material is used in Flanged Sight Glass, and how are they selected?

    The material you use in Flanged Sight Glass depends on the fluid, temperature, process pressure, and observation.

    · Transparent glass:

    It is the essential part of Flanged Sight Glass. And it can be composed of many transparent solids. This glass is used to sight through it. It is high transmission inside the highly required spectrum. Many industries require transmission within the visual spectrum, and it needs usual window materials, i.e., silicate glass and standard plastic. But in some industries, other materials can also be used where required. If you are working with thermal imaging or carbon dioxide, you need a long infrared range. And if you need a sight glass for neutron scans, you will use beryllium material. But they look like any other industrial Flanged Sight Glass. Most of the windows are made up of Sapphire glass. But its cast is high. Usually, the industrial window is made up of soda-lime or borosilicate glass.

    · Body:

    You can make the body of Flanged Sight Glass with several materials. The most common materials used in industrial Flanged Sight Glass bodies are stainless steel or carbon steel. If the Flanged Sight Glass is composed of carbon steel, you should paint it to prevent rust. To avoid rust and corrosion, you should work with very corrosive applications. Then it would help if you used very corrosion-resistant superalloys.

    · Sealing:

    Sealing material in Flanged Sight Glass, i.e., gasket and packing, should be of plastic and other soft materials, or you can even use soft metal for this purpose. The most critical area on the window material surface is the seat of the sealing gasket. So it is very beneficial for you to use as soft material in the sealing material as you can to minimize the gasket seating load of the gasket. 

    Get in Touch with Us