The diaphragm valve is a specialized form of valve that has a
flexible diaphragm as its main feature. This allows it to isolate the medium from other parts inside the valve body,
thus enabling control of the flow of fluid or cut-off. Due to its unique structure, the diaphragm valve is widely
used in corrosive media, for high-cleanliness applications and for meeting the sanitary requirements of the system.
Structure and Working Principle of Diaphragm Valves
A diaphragm valve is primarily composed of components such as the valve body, diaphragm, and disc. (Taking Taloar’s
stainless steel diaphragm valve as an example here.) Among these, the diaphragm is the critical component
for isolating the fluid, typically made of materials like EPDM rubber or PTFE. The disc is the part that
controls the opening and closing of the diaphragm, and its position and movement state directly determine the
valve’s opening degree and flow rate. The valve body serves as the main structure supporting the diaphragm
and disc, featuring excellent sealing performance.
The diaphragm valve works by controlling fluid flow through the vertical movement of the diaphragm. When the
diaphragm is lifted, fluid can flow through the valve body; when the diaphragm is pressed down, fluid flow
is blocked. The opening and closing states of the diaphragm valve are controlled by the valve
stem and actuators (such as manual, electric, or pneumatic devices).
The Taloar SE Series high-performance seals utilize imported diaphragm sheets, offering long
service life, excellent heat resistance, and field-replaceable maintenance.
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EPDM diaphragm FIG. SE200
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EPDM+PTFE diaphragm FIG. SE350
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EPDM+PTFE split diaphragm FIG. SE500
Types of Diaphragm Valves
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Manual u-type three-way diaphragm valve
The manual u-type three-way diaphragm valve is a kind of
valve that controls fluid direction through manual operation, suitable for applications requiring fluid
switching or distribution. Its U-shaped design facilitates fluid passage and reduces resistance, while
the diaphragm structure effectively prevents media leakage.
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Manual tank bottom diaphragm valve
The manual tank bottom diaphragm valve is a valve installed at the bottom of a tank, designed to control the discharge or shut-off of media within the tank. Its diaphragm design effectively prevents leakage, making it suitable for applications requiring high sealing performance and corrosion resistance.
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Manual quick-install diaphragm valve with sampling port
The manual quick-install diaphragm valve with
sampling port is a valve that combines quick-installation and sampling functionalities,
designed for applications requiring rapid disassembly, cleaning, and sampling. Its design ensures
ease of operation and maintenance while meeting high hygiene standards.
2.
In terms of actuation methods
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Manual diaphragm valve: Operated
via handwheel or lever, cost-effective, ideal for small-diameter
pipelines or maintenance bypass systems.
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Pneumatic diaphragm valve: Features response time is less than 1 second,
supporting explosion-proof environments, and is widely used in automated filling lines.
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Electric diaphragm valve: Equipped with an integrated PID control module, suitable for fermentation
temperature systems requiring continuous adjustment.
3.
In terms of industry requirements
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Aseptic diaphragm valve：
With mirror polish &
full evacuation design, conforming to ASME BPE standards.
Application: Media transfer in vaccine
production.
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High-temperature & high-pressure type
Equipped with metal-reinforced diaphragm, resistant to steam
sterilization at 150°C and 6.4MPa pressure.
Application: High-temperature sterilization line for canned
food.
Taloar stainless steel diaphragm valves are available with welded or clamped connections, and the actuation type has
manual or pneumatic control. (The pneumatic options include normally closed, normally open or double acting,
according to the requirement of adding a solenoid valve, position feedback or positioning regulators.) The valve
body is made of 316L stainless steel and can be selected as straight-through, T-shape, tank bottom, or multi-channel
structure. The diaphragm can be selected as EPDM single diaphragm or EPDM+PTFE double diaphragm according to the
needs of the use. The medium is applicable to inert, corrosive liquids and gases. The sealing material is in
accordance with FDA 177.1210/2600 and the connecting dimensions are in accordance with DIN, 3A, ISO, ASME BPE and
related standards, to be confirmed before ordering.
Application
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Chemical industry
Application scenarios: Transport of highly corrosive liquids such as sulfuric acid and
hydrochloric acid, feed control for reaction vessels
Selection criteria: PTFE lining + fluororubber
diaphragm, temperature resistance up to 180°C
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Pharmaceutical and bioengineering
Application scenarios: Purified water systems, CIP/SIP cleaning
pipelines, sterile environments in fermentation tanks
Special requirements: Compliance with FDA and 3-A
sanitary certifications, mirror polishing treatment on valve bodies
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Food and beverage industry
Application scenarios: Filling of high-viscosity materials such as jam and
dairy products, CIP circulation systems
Key design: Diaphragm material must be NSF-certified to avoid
contamination risks
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Environmental protection and water treatment
Application scenarios: Sludge transportation in sewage
treatment plants, chemical dosing control
Anti-clogging advantage: Full-bore design capable of handling
media containing fibers and particles
Taloar aseptic diaphragm valves can be used in the biopharmaceutical, food and beverage, fine chemical, and
microelectronics semiconductor industries. The valve body and sealing materials can maintain their tolerance and
sealing properties for extended periods under disinfection or sterilization conditions.
Installation
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According to the main network’s specifications, the connecting pipe of the valve body can be made to different
standards (see the picture below). The diaphragm valve can also be made to different connection methods,
depending on the application. These include welded, clam and flange connection.
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The valve body requires a specific installation angle to ensure axial rotation (drainage angle) until the
farthest point of the sealing ridge from the center aligns with the lowest point of the pipeline connection.
This configuration allows media to pass through the valve unimpeded under low pressure drop and fully open
conditions. Different diaphragm valve specifications demand varying self-draining tilt angles. Insufficient
installation tilt will cause liquid retention in the valve weir, leading to contamination and
cross-contamination risks. Properly installed diaphragm valves achieve complete self-drainage by gravity. The
diagram below illustrates the installation angle for a two-way diaphragm valve, where an angle gauge mounted on
the valve seat enables precise adjustment of the drainage angle.
The Taloar DV56 series aseptic diaphragm valves are designed with an integrated self-draining feature. During
installation, specific angles are recommended based on valve size to ensure complete drainage after cleaning,
preventing liquid retention in the valve cavity.
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Inspect pipeline connections: Before installation, verify that pipeline connections are secure and ensure proper
alignment of pipeline and valve ports to avoid leaks caused by loose fittings or mismatched interfaces.
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Pressure compatibility: Ensure the fluid system pressure does not exceed the valve’s rated capacity during
installation. Excessive pressure may damage the diaphragm or compromise sealing integrity. Always verify system
pressure and confirm valve suitability for the operating range.
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Avoid overtightening: Refrain from over-tightening connection screws during installation, as this may deform the
valve body or damage the diaphragm. Follow the manufacturer’s specified torque standards.
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Regular maintenance: Though durable, diaphragm valves require periodic inspection. Check for diaphragm wear or
aging, and replace the diaphragm as needed to maintain optimal performance.
The Taloar stainless steel aseptic diaphragm valves offer versatile configurations to meet user-specific
requirements, allowing flexible installation and space-saving layouts.
As a professional valve manufacturer, Taloar is dedicated to offering its customers the highest quality diaphragm
valve products on the market. Taloar diaphragm valve range includes sizes from 3/8 inch to 3 inches. Should you
have any special customized products, please contact us.
If you need to keep up with innovations and technological advancements in diaphragm valves, Taloar will support you!
For more details, please contact sales@taloar.com or WhatsApp 008618112507128.
