Diaphragm Valves
Diaphragm valves are designed to regulate the flow of liquids and gases by using a flexible diaphragm to create a secure seal. These valves are ideal for applications where the transported media is corrosive, abrasive, or requires sanitary handling. Their simple yet effective design minimizes the risk of contamination, making them widely used in industries such as chemical processing, pharmaceuticals, food and beverage, and water treatment.
Centro offers a comprehensive selection of diaphragm valves in manual and pneumatic actuated designs to suit various operational needs. Whether you require precise hand-operated flow control or an automated valve for high-efficiency processing, we have the right solution.
Types of Diaphragm Valves We Offer
- Manual Diaphragm Valves – Hand-operated for precise control in low-pressure systems
- Pneumatic Actuated Diaphragm Valves – Use compressed air for automated on/off operation
- Weir-Type Diaphragm Valves – Provide excellent sealing for corrosive and particulate-laden fluids
- Straight-Through Diaphragm Valves – Offer minimal flow resistance for high-purity applications
- Sanitary Diaphragm Valves – Designed for hygienic industries, including food, beverage, and pharmaceuticals
Why Choose Diaphragm Valves from Centro?
- Superior sealing performance for corrosive, abrasive, and sanitary applications
- Available in a variety of materials, including stainless steel, plastic, and lined options
- Suitable for industries such as chemical processing, pharmaceuticals, biotechnology, and water treatment
- Sourced from trusted manufacturers to ensure durability, reliability, and compliance with industry standards
Centro provides high-quality diaphragm valves designed for long-lasting performance. Browse our selection and order online today, or contact our team for expert assistance in selecting the right valve for your application.
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AQ Matic/Aquamatic and Control Valvess V42K-3002-00000 4” ASTM Flange Normally Open, Spring Assist Closed Diaphragm Valve
$1,430.38$1,734.29
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3010-00000 4” ASTM Flange Normally Open, Limit Stop Diaphragm Valve
$1,400.88$1,698.53
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42B-0021-00000 3/4" NPT Normally Open, Position Indicator, Spring Assist Open Diaphragm Valve
$273.46$331.56
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42F-0001-20000 2” NPT Normally Open, Spring Assist Open Diaphragm Valve
$513.71$622.85
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42J-3001-20000 3” ASTM Flange Normally Open, Spring Assist Open Diaphragm Valve
$951.73$1,153.94
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42J-3021-00000 3” ASTM Flange Normally Open, Position Indicator, Spring Assist Open Diaphragm Valve
$895.84$1,086.18
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3000-20000 6” ASTM Flange Normally Open Diaphragm Valve
$5,547.23$6,725.87
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3032-00000 6” ASTM Flange Normally Closed, Spring Assist Closed Diaphragm Valve
$4,921.41$5,967.08
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42J-0001-20000 3” NPT Normally Open, Spring Assist Open Diaphragm Valve
$800.10$970.09
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3021-00000 4” ASTM Flange Normally Open, Position Indicator, Spring Assist Open Diaphragm Valve
$1,439.48$1,745.33
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3030-00000 4” ASTM Flange Normally Closed Diaphragm Valve
$1,356.95$1,645.26
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3032-20000 4” ASTM Flange Normally Closed, Spring Assist Closed Diaphragm Valve
$1,709.95$2,073.26
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3040-00000 4” ASTM Flange Normally Closed, Limit Stop Diaphragm Valve
$1,452.53$1,761.15
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3000-00000 6” ASTM Flange Normally Open Diaphragm Valve
$4,610.65$5,590.29
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3002-00000 6” ASTM Flange Normally Open, Spring Assist Closed Diaphragm Valve
$4,840.37$5,868.82
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3010-00000 6” ASTM Flange Normally Open, Limit Stop Diaphragm Valve
$4,844.16$5,873.41
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3020-00000 6” ASTM Flange Normally Open, Position Indicator Diaphragm Valve
$4,932.14$5,980.08
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3030-00000 6” ASTM Flange Normally Closed Diaphragm Valve
$4,691.69$5,688.55
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3030-20000 6” ASTM Flange Normally Closed Diaphragm Valve
$5,628.27$6,824.13
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
The Spartan Scientific Series 3680 2-Way, 2-Position solenoid diaphragm valve offers the highest flow for the smallest overall size in its class. The valve is designed from the ground up using modern design technologies and materials. Featuring a full flow orifice, the 3680 is available in either Normally Closed or Normally Open configurations. The PEI body is media compatible, light in weight, and by use of external metal port rings, is virtually indestructible. The Normally Open version of the valve features an optional turn lock manual override and has no external by-pass tube which eliminates leak points and size. The body is available in 3/4” and 1” NPT. The low wattage solenoid features an Industry Standard 22 mm wide coil electrical interface and is nylon encapsulated. FKM, EPDM and NBR are standard elastomers and the operators are made of stainless steel / brass or stainless steel / brass with copper shading rings for AC versions. Typical applications include control of inert gases, water and compatible fluids.
$169.47$177.95
Available for Purchase
Subject to factory lead times
The Spartan Scientific Series 3680 2-Way, 2-Position solenoid diaphragm valve offers the highest flow for the smallest overall size in its class. The valve is designed from the ground up using modern design technologies and materials. Featuring a full flow orifice, the 3680 is available in either Normally Closed or Normally Open configurations. The PEI body is media compatible, light in weight, and by use of external metal port rings, is virtually indestructible. The Normally Open version of the valve features an optional turn lock manual override and has no external by-pass tube which eliminates leak points and size. The body is available in 3/4” and 1” NPT. The low wattage solenoid features an Industry Standard 22 mm wide coil electrical interface and is nylon encapsulated. FKM, EPDM and NBR are standard elastomers and the operators are made of stainless steel / brass or stainless steel / brass with copper shading rings for AC versions. Typical applications include control of inert gases, water and compatible fluids.
$164.79$173.04
Available for Purchase
Subject to factory lead times
Diaphragm Process Valve, 2-way, 2-position, Normally Closed, Composite Valve Body
$175.60$184.39
Available for Purchase
Subject to factory lead times
Diaphragm Process Valve, 2-Way, 2-Position, Normally Open, Brass Valve Body
$185.91$195.21
Available for Purchase
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3002-00000 4” ASTM Flange Normally Open, Spring Assist Closed Diaphragm Valve
$1,430.38$1,734.29
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3010-00000 4” ASTM Flange Normally Open, Limit Stop Diaphragm Valve
$1,400.88$1,698.53
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42B-0021-00000 3/4" NPT Normally Open, Position Indicator, Spring Assist Open Diaphragm Valve
$273.46$331.56
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42F-0001-20000 2” NPT Normally Open, Spring Assist Open Diaphragm Valve
$513.71$622.85
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42J-3001-20000 3” ASTM Flange Normally Open, Spring Assist Open Diaphragm Valve
$951.73$1,153.94
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42J-3021-00000 3” ASTM Flange Normally Open, Position Indicator, Spring Assist Open Diaphragm Valve
$895.84$1,086.18
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3000-20000 6” ASTM Flange Normally Open Diaphragm Valve
$5,547.23$6,725.87
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3032-00000 6” ASTM Flange Normally Closed, Spring Assist Closed Diaphragm Valve
$4,921.41$5,967.08
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42J-0001-20000 3” NPT Normally Open, Spring Assist Open Diaphragm Valve
$800.10$970.09
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3021-00000 4” ASTM Flange Normally Open, Position Indicator, Spring Assist Open Diaphragm Valve
$1,439.48$1,745.33
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3030-00000 4” ASTM Flange Normally Closed Diaphragm Valve
$1,356.95$1,645.26
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3032-20000 4” ASTM Flange Normally Closed, Spring Assist Closed Diaphragm Valve
$1,709.95$2,073.26
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42K-3040-00000 4” ASTM Flange Normally Closed, Limit Stop Diaphragm Valve
$1,452.53$1,761.15
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3000-00000 6” ASTM Flange Normally Open Diaphragm Valve
$4,610.65$5,590.29
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3002-00000 6” ASTM Flange Normally Open, Spring Assist Closed Diaphragm Valve
$4,840.37$5,868.82
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3010-00000 6” ASTM Flange Normally Open, Limit Stop Diaphragm Valve
$4,844.16$5,873.41
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3020-00000 6” ASTM Flange Normally Open, Position Indicator Diaphragm Valve
$4,932.14$5,980.08
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3030-00000 6” ASTM Flange Normally Closed Diaphragm Valve
$4,691.69$5,688.55
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
AQ Matic/Aquamatic and Control Valvess V42L-3030-20000 6” ASTM Flange Normally Closed Diaphragm Valve
$5,628.27$6,824.13
Should ship between 07 Nov and 21 Nov
Subject to factory lead times
The Spartan Scientific Series 3680 2-Way, 2-Position solenoid diaphragm valve offers the highest flow for the smallest overall size in its class. The valve is designed from the ground up using modern design technologies and materials. Featuring a full flow orifice, the 3680 is available in either Normally Closed or Normally Open configurations. The PEI body is media compatible, light in weight, and by use of external metal port rings, is virtually indestructible. The Normally Open version of the valve features an optional turn lock manual override and has no external by-pass tube which eliminates leak points and size. The body is available in 3/4” and 1” NPT. The low wattage solenoid features an Industry Standard 22 mm wide coil electrical interface and is nylon encapsulated. FKM, EPDM and NBR are standard elastomers and the operators are made of stainless steel / brass or stainless steel / brass with copper shading rings for AC versions. Typical applications include control of inert gases, water and compatible fluids.
$169.47$177.95
Available for Purchase
Subject to factory lead times
The Spartan Scientific Series 3680 2-Way, 2-Position solenoid diaphragm valve offers the highest flow for the smallest overall size in its class. The valve is designed from the ground up using modern design technologies and materials. Featuring a full flow orifice, the 3680 is available in either Normally Closed or Normally Open configurations. The PEI body is media compatible, light in weight, and by use of external metal port rings, is virtually indestructible. The Normally Open version of the valve features an optional turn lock manual override and has no external by-pass tube which eliminates leak points and size. The body is available in 3/4” and 1” NPT. The low wattage solenoid features an Industry Standard 22 mm wide coil electrical interface and is nylon encapsulated. FKM, EPDM and NBR are standard elastomers and the operators are made of stainless steel / brass or stainless steel / brass with copper shading rings for AC versions. Typical applications include control of inert gases, water and compatible fluids.
$164.79$173.04
Available for Purchase
Subject to factory lead times
Diaphragm Process Valve, 2-way, 2-position, Normally Closed, Composite Valve Body
$175.60$184.39
Available for Purchase
Subject to factory lead times
Diaphragm Process Valve, 2-Way, 2-Position, Normally Open, Brass Valve Body
$185.91$195.21
Available for Purchase
Subject to factory lead times
FAQS
- A diaphragm valve is a type of linear motion valve that uses a flexible diaphragm to control flow. The diaphragm presses against a seat to stop flow and lifts away to allow fluid to pass.
- When the actuator or handwheel is operated, the diaphragm moves up or down. Pressing the diaphragm against the valve body stops flow, while lifting it allows flow through the valve.
- Diaphragm valves provide excellent leak tight shutoff, isolate the process fluid from the valve internals, reduce contamination risk, and require minimal maintenance.
- Common types include weir diaphragm valves and straight through diaphragm valves. Each design suits different flow and pressure requirements.
- Valve bodies are commonly made from plastic, cast iron, ductile iron, stainless steel, or specialty alloys. Diaphragms are typically made from EPDM, PTFE, rubber, or elastomer blends.