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Professional Pneumatic Diaphragm Valve Manufacturer

●Mechanism is separated from the medium passage.

●Especially suitable for chemical corrosion.

●Simple structure.

●Easy assemble and repair.

●Does not have pockets to trap solids, slurries, and other impurities.

●Bubble-tight service.

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    BCST your Expert Pneumatic Diaphragm Valve Supplier in China

    BCST pneumatic diaphragm valves are pneumatic actuators, air pressure is applied through a pilot valve into the actuator which in turn raises the diaphragm and opens the valve. This valve is one of the more common valves used in operations where valve speed is a necessity.

    BCST your One-Stop Pneumatic Diaphragm Valve Solution in China

    BCST pneumatic diaphragm valve is widely used in various applications such as waste and wastewater, power, pulp and paper, chemical, cement, mining and minerals, pharmaceuticals, and bioprocessing.

    To know more about our pneumatic diaphragm valve, visit

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    BCST your BEST Supplier for Pneumatic Diaphragm Valve

    BCST substantial choice of pneumatic diaphragm valves gives the fine answer to your requirements. BCST is a skilled and experienced pneumatic diaphragm valve producer. As an ISO-registered company, BCST has a robust expert and professional technical team with over 20 generations of manufacturing and exporting experience.

    BCST has advanced pneumatic diaphragm valves with its very own specifications that meet the maximum vital primary concepts of process control. Our merchandise is CE, SIL2, and RoHS approved. BCST is one of the main dependable and strong pneumatic diaphragm valves producers in China. If you`re trying to find a skilled producer for your subsequent project, with robust technical experience, expert team, and budget-pleasant merchandise, BCST is your maximum appropriate choice.

     BCST is your expert associate for managing valve solutions. Welcome to go to our factory.

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    BCST Pneumatic Diaphragm Valve 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

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    Pneumatic Diaphragm Valve -FAQ

    What is the selection principle of the pneumatic sanitary diaphragm valve?  

    pneumatic sanitary valve is a type of clamping valve, and you can use it to open and close your pipeline. When you use a pneumatic diaphragm valve, you can get two kinds of main benefits from its usage. First, you don’t need extra packing or seal structure. In a pneumatic diaphragm, the valve diaphragm plays a significant role in sealing the system as it cuts off the medium. The second benefit is that the diaphragm in the pneumatic diaphragm valve has perfect closing performance on which you can rely, and the valve can do a good cut-off.

    As the operating system and media path are entirely separate, you can use a pneumatic diaphragm valve not only in the food industry but also in those industries with greater media risk.

    Usually, you need a pneumatic diaphragm valve in condition when you need the strict performance of sealing: mud material, lighter structure, low pressure, and cut-off to the atmosphere. You can distinguish the round-shaped metallic film clamped to the body and plays a part of a barrio between the stem and the media passing through the valve. You can close the pneumatic diaphragm valve when you press the disk. And you can open the valve by using a spring inside the valve, which opens the disk, and the steam rises.

    As the pneumatic diaphragm valve contains a larger seat inside, it has more power than the standard valves and enough sealing force on the disc because the disc and stem are separate. The disc doesn’t push the valve away from the seat. That’s why the pneumatic diaphragm valve is compatible with differential pressure flow. The media remains beneath the seat. But you should avoid a considerable quantity of backflow to avoid valve closure. So if you choose a pneumatic diaphragm valve for your system, it will be a good choice as it is pocket friendly and very efficient in circumstances where you are dealing with high-temperature or high-pressure.

    structural of diaphragm valve

    What are the main functions of the Pneumatic diaphragm valve?


    • the Pneumatic diaphragm valve may have a plastic hand wheel and stainless steel hand wheel.


    • The Pneumatic diaphragm valve may contain a Pneumatic plastic actuator, stainless steel actuator, and an electric pneumatic actuator.

    Unit for control and indication

    • Unit for intelligent control and indication proximity switches of the sensor position
    • limit stoker
    • And C-top control (on/off)
    • IL-top control (POSITIONER)

    What are the characteristics of a Pneumatic diaphragm valve?

    Today is the age of industry. And in modern industry, the valve must be connected to the piping system, as if the valve has an absolute position in modern industry. And almost all the industries are using a wide range of different kinds of valves. Many of them use using Pneumatic diaphragm valve.

    Pneumatic diaphragm valve is used in industries working with water gas and media. The Pneumatic diaphragm valve controls and regulates different kinds of material like water, media, gas, or oil. So you can use the Pneumatic diaphragm valve in the petroleum, medicine, and dairy industries.

    The Pneumatic diaphragm valve is popular because of its extraordinary work efficiency and characteristics. Let’s have a look at the characteristics of the Pneumatic diaphragm valve.

    Pneumatic diaphragm valve 

    Pneumatic diaphragm valve is composed of a very flexible diaphragm inside the body and bonnet, and a pit membrane is a pressure tool adjacent to the diaphragm. The seat of the Pneumatic diaphragm valve is straight or worn across the pipe. The main benefit of sanitary diaphragm valves is that the control mechanism is away from the media flow; hence it will secure the control mechanism and make the flow movement smooth and secure.

    Flexible working of the valve:

    Here is a Pneumatic diaphragm valve; you don’t need any extra stem or sealing as a safety tool is there to regulate the media, which is risky or harmful material. So in a Pneumatic diaphragm valve, the flow material will only come in contact with the diaphragm and the body, which are made up of different kinds of materials, so the Pneumatic diaphragm valve is the best choice when you are working with different kinds of media which sometimes may be toxic or hard. The working temperature of the Pneumatic diaphragm valve is approximate -50to 175-degree C.

    Straight forward structure of valve:

    You can quickly handle a sanitary diaphragm valve when working with different kinds of materials. Liquids like water and gas can flow freely inside the valve, and you will not notice any leakages. It contains a simple actuator, and you can handle the valve manually or remotely without facing any difficulty. You will press the rubber film, and you will manage to handle the media. It contains many kinds of connection ways like flange connection, welding connection, and move-able flange connection.

    Extensive use of sanitary diaphragm valve:

    The Pneumatic diaphragm valve comprises three types of actuators: air type, the second one is usually a closed type of actuator, and the third is usually an open kind of actuator. All three types of Pneumatic diaphragm valves are simple and durable. Pneumatic diaphragm valves are used in many industrial units. You can use it in water heating, food plants, medicine and petroleum, and other corrosive industries.

    Extensive use of sanitary diaphragm valve

    What is the working principle of the pneumatic diaphragm valve?

    The pneumatic diaphragm valve remains in a close position typically. But when the diaphragm clings to the valve’s body cavity, sets toward the closing position, and sets to stop the flow inside the pipeline, then the stem moves towards an upward position concerning the manual method by using a hand wheel or sometimes by driving pneumatic actuators. And then, the diaphragm of the Pneumatic diaphragm valve is named up, and the Pneumatic diaphragm valve is set to an open or clean position. A diaphragm is a tool that divides the upper and lower part of the valve from the valve cover. So it will protect the stem and other valve parts from corrosion. It means there will be no leakage inside the system even after packing and sealing materials are eliminated. Hence the valve design will help you discharge the liquid as it is optimized.

    From which material Pneumatic diaphragm valve is made up?

    The material used for Generating pneumatic diaphragm valve:

    A pneumatic sanitary diaphragm valve is composed of stainless steel material, and typically you can use a Pneumatic diaphragm valve in food industries, biological systems, and laboratories. The pneumatic diaphragm valve contains a pneumatic actuator. Sometimes the valve may contain plastic material used in some of the valve parts. The Pneumatic diaphragm valve may contain different kinds of connections. Like it can be welded, clamped, and threaded. The Pneumatic diaphragm valve is mirror polished from the inner side, and on the outside, it is sandblasted. It contains the EPDM+PTFE membrane to handle the flow in the pipeline.

    What are the applications of the Pneumatic diaphragm valve?

    Here are the applications of the Pneumatic diaphragm valve:

    • The Pneumatic diaphragm valve comprises a stainless steel body and a pneumatic actuator.
    • The pneumatic diaphragm valve contains clamp connections.
    • The Pneumatic diaphragm valve is a perfect choice for open/close operations.
    • You can use it in sampling, laboratory-related functions, and biological units.

    What is a u-type Pneumatic diaphragm valve?

    Pneumatic diaphragm valve contains a u-type body; that’s why it is named a u-type Pneumatic diaphragm valve. It always contains an actuator and has two ports. It is composed of a wire, or it may have a seat on which the diaphragm manages to close the valve. It will give you the seal of the valve body and the valve seat. There is no way for the flow to come in contact with the outside atmosphere. You can use a u-type Pneumatic diaphragm valve for aseptic kind of works. You can choose this kind of Pneumatic diaphragm valve for pharmaceutical industries.

    Features of U-type Pneumatic diaphragm valve:

    U-type Pneumatic diaphragm valve has very outstanding features. let’s see what these features are:

    • The body of the valve is made up of stainless steel material.
    • All the parts of the Pneumatic diaphragm valve are mirror polished.
    • You can get numerous connections like a clamp or cover connection, butt weld, or flange.
    • It may contain a multi-channel diaphragm valve.
    • You can maintain it easily.
    • It is pocket friendly.

    What are the structure and features of mini pneumatic diaphragm valves?

    As you need to know everything about the Pneumatic diaphragm valve, you should be able to use the most suitable and compatible Pneumatic diaphragm valve for your system:

    Structure of Sanitary Mini Pneumatic diaphragm valve:

    Mini Pneumatic diaphragm valves are available in different structures and designs, such as:

    • Straight Through Pneumatic diaphragm valve
    • Two-Way Pneumatic diaphragm valve
    • Three-Way Pneumatic diaphragm valve
    • T-Type Pneumatic diaphragm valve

    What is the main feature of the mini Pneumatic diaphragm valve?

    the salient feature of the mini Pneumatic diaphragm valve is as follows:

    • The mini Pneumatic diaphragm valve has No dead angle and a compact design.
    • The seat material of the mini Pneumatic diaphragm valve is EPDM+PTFE double seal.
    • the verity of body types available such as 2way, three ways, U type, and T type
    • Its connections might be butt-welded, tri-clamp, and sanitary.
    • Mini Pneumatic diaphragm valve may contain a plastic pneumatic actuator or stainless steel actuator.
    • It is air operated and needs air to open, and you can close it by using a spring.
    • And if it is ordinarily closed kind of valve, then you need air to close and spring to open. 
    • The working temperature of the pneumatic diaphragm valve is -30 to 150-degree C.

    What is the use of a Pneumatic diaphragm valve?

    A Pneumatic diaphragm valve is composed of stainless steel parts which are acid-proof material, and its sealing is composed of silicon rubber. This material ensures food safety. This valve is used in the food, dairy, and wine industries. 

    The Pneumatic diaphragm valve is also used in the biological and engineering industries. The Pneumatic diaphragm valve is also called a clean valve because of its straightforward style and efficient working. The valve contains an actuator that handles the flow rate of media.

    Who is producing the sanitary diaphragm valve?

    BCST has been manufacturing the best-quality Pneumatic diaphragm valve for the last 20 years. BCST has a rich historical past on technical grounds for producing highly efficient Pneumatic diaphragm valve

     The BCST likewise exports the Pneumatic diaphragm valve to several hundred international locations. BCST is one of the most popular Pneumatic-diaphragm valve manufacturing companies in china. 

     Pneumatic Diaphragm Valve contains a pneumatic actuator; compressed air drives this kind of Pneumatic Diaphragm Valve to control the flow.

     The valve body resists the corrosion this kind of Pneumatic Diaphragm Valve contains a smooth flow inside the valve body. Using a Pneumatic Diaphragm Valve benefits from a large flow area, zero leakage, and reliability. So you can use this type of Pneumatic Diaphragm Valve to fulfill your industrial needs, as it is widely used in many industries.

    Why is the smooth surface finish necessary for the sanitary diaphragm valve?

    The smooth surface finish is essential for any valve because it measures the fraction level of the media passing through the valve. When the fraction is low inside the valve, it enhances the Pneumatic Diaphragm Valve working, as it breaks the chemical bonds in a better way, and it can generate the products very quickly. The surface finish rate plays a more critical role in working the Pneumatic Diaphragm Valve. Any surface with scratches or too high or too low places will get dirty, and you will not be able to get good results. You can measure the two features mentioned above with the help of Grit and Raw, and the standard for the latter is 32. The latter 32 is the basic standard for all Pneumatic Diaphragm Valve. Pharmaceutical companies use the ASME BPE standard.

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