Diaphragm Valves - Spartan Scientific
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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316 stainless steel diaphragm valve engineered for harsh industrial and food-service environments, delivering reliable fluid control up to 220 psi with zero-minimum-pressure-differential capability.
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The Spartan Scientific Series 6700 2-Way, 2-Position process type solenoid operated diaphragm valve offers the highest flow for the smallest overall size in its class in an all brass body form. The valve is designed from the ground up using modern design technologies and materials. The heart of the design uses a rolling diaphragm which exhibits superior flow for size. Featuring a full flow 28.58mm (1.13") orifice, the 6700 is available in Normally Closed configurations. The all brass body construction is available in 3/4" and 1.0" NPT port configuration with a maximum of 14 Cv (maximum flow is 53.3 GPM @ 120 PSI), This design is virtually indestructible when using clean media and proper environment. Typical applications include 2 way control of inert gases, water and compatible fluids.
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The Spartan Scientific Series 45A0 2-Way, 2-Position Solenoid Valve is a brass bodied, stainless steel operator valve for electronic control of air, water or any seal compatible media. The versatile design is feature rich including with and without manual override, EPDM, FKM and NBR sealing materials and slow close anti-water hammer options. Additional special options include oxygen clean, and latching versions. Valves are available in 1/4”, 3/8” and 1/2” NPT and all standard AC and DC voltages. Coils are fully encapsulated and are available standard with flying lead and DIN 43650 form A with wire grip or 1/2” conduit as options.
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The Spartan Scientific Series 3685 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 3685 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 1.0” NPT. The low wattage solenoid features a DIN 43650 Form A 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.
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The Spartan Scientific Series 35KR 2-Way, 2-Position solenoid valve is a variation on the popular Series 3500 valves which feature miniaturized size vs. flow rate while allowing the user to manifold multiple outlets with one inlet. The 35KR design features the direct pilot design which controls 0 to 150 PSI in the all plastic version. The intermediate orifice plate design is the key to the 35KR in that it includes all the details of careful orifice design and creates a simple sealing pattern which can be mounted to integrated equipment and complex manifolds with simple mounting screws. The mounting style reduces leak points and numbers of connections. The 12mm orifice promotes full flow while the valve body, at only 1.5 inches wide, can be gang mounted to give impressively small envelope packages with many outputs. The simple mounting pattern is shown under dimensional data and can be machined into many varied manifold configurations.
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The Spartan Scientific Series 3585 2-Way, 2-Position solenoid diaphragm valve offers the highest flow for the lightest weight in its class. The valve is designed from the ground up using modern design technologies and materials. Featuring a full flow 1/2” (12.5 mm) orifice, the 3585 is available in either Normally Closed or Normally Open configurations. The nylon 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 1/4”, 3/8” and 1/2” NPT or BSP. The low wattage solenoid features a DIN 43650 Form A electrical interface and is nylon encapsulated. FKM, NBR and EPDM 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.
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The Spartan Scientific Series 3516 2-Way, 2-Position Normally Closed or Normally Opened solenoid diaphragm process valve offers the highest flow for the smallest overall size in its class as compared to competitive units. The valve is designed from the ground up using modern design technologies and materials. The potable water brass body is media compatible, rugged and virtually indestructible. The body is available in 1/4”, 3/8” and 1/2” NPT. The low wattage solenoid features a DIN Style “A” EN175301-803 (Formerly DIN 43650) 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.
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The Spartan Scientific Series 3510 2-Way, 2-Position, internally piloted solenoid valve uses the latest technologies for materials and function. This combination provides the user with the highest quality, smallest size per Cv of flow and most competitive pricing of any valve on the market. The 3510 gives full flow throughout the pressure range starting with a Maximum Operating Pressure Differential of 1.5 psi while remaining sealed at 0 psi. The body is available in 1/4", 3/8" and 1/2" NPT sizes and features a stainless steel anti-flex ring for port strength. The molded pilot section features a push, non-locking manual override, high cycle life solenoid parts, and quick connect DIN Style “A” EN175301-803 (Formerly DIN 43650) or “flying lead” electrical connection options. Typical applications include air, emulsion, inert gases, oil and water control, condensate drainage, hot water plumbing and sprinkler systems.
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The Spartan Scientific Series 3505 is a 2-Way, 2-Position, internally piloted solenoid valve for the control of air, emulsion, inert gases and water. The valve features an all brass body and a full flow 1/2” orifice while maintaining a 1.5 minimum pressure differential. The design allows for a tight seal on the orifice at 0 psi. Available in 1/4”, 3/8” and 1/2” NPT, the 3505 can handle pressures to 230 psi. The encapsulated coil construction ensures that the valve functions well under long periods of activation (100% duty), as well as providing a high degree of environmental protection (NEMA 4). The inner valve functions as a direct assist using a flat diaphragm and orifice plate. Pressure differentials shift the valve to full open or full closed. A push, non-locking manual override is standard.
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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
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316 stainless steel diaphragm valve engineered for harsh industrial and food-service environments, delivering reliable fluid control up to 220 psi with zero-minimum-pressure-differential capability.
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The Spartan Scientific Series 6700 2-Way, 2-Position process type solenoid operated diaphragm valve offers the highest flow for the smallest overall size in its class in an all brass body form. The valve is designed from the ground up using modern design technologies and materials. The heart of the design uses a rolling diaphragm which exhibits superior flow for size. Featuring a full flow 28.58mm (1.13") orifice, the 6700 is available in Normally Closed configurations. The all brass body construction is available in 3/4" and 1.0" NPT port configuration with a maximum of 14 Cv (maximum flow is 53.3 GPM @ 120 PSI), This design is virtually indestructible when using clean media and proper environment. Typical applications include 2 way control of inert gases, water and compatible fluids.
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The Spartan Scientific Series 45A0 2-Way, 2-Position Solenoid Valve is a brass bodied, stainless steel operator valve for electronic control of air, water or any seal compatible media. The versatile design is feature rich including with and without manual override, EPDM, FKM and NBR sealing materials and slow close anti-water hammer options. Additional special options include oxygen clean, and latching versions. Valves are available in 1/4”, 3/8” and 1/2” NPT and all standard AC and DC voltages. Coils are fully encapsulated and are available standard with flying lead and DIN 43650 form A with wire grip or 1/2” conduit as options.
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The Spartan Scientific Series 3685 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 3685 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 1.0” NPT. The low wattage solenoid features a DIN 43650 Form A 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.
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The Spartan Scientific Series 35KR 2-Way, 2-Position solenoid valve is a variation on the popular Series 3500 valves which feature miniaturized size vs. flow rate while allowing the user to manifold multiple outlets with one inlet. The 35KR design features the direct pilot design which controls 0 to 150 PSI in the all plastic version. The intermediate orifice plate design is the key to the 35KR in that it includes all the details of careful orifice design and creates a simple sealing pattern which can be mounted to integrated equipment and complex manifolds with simple mounting screws. The mounting style reduces leak points and numbers of connections. The 12mm orifice promotes full flow while the valve body, at only 1.5 inches wide, can be gang mounted to give impressively small envelope packages with many outputs. The simple mounting pattern is shown under dimensional data and can be machined into many varied manifold configurations.
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The Spartan Scientific Series 3585 2-Way, 2-Position solenoid diaphragm valve offers the highest flow for the lightest weight in its class. The valve is designed from the ground up using modern design technologies and materials. Featuring a full flow 1/2” (12.5 mm) orifice, the 3585 is available in either Normally Closed or Normally Open configurations. The nylon 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 1/4”, 3/8” and 1/2” NPT or BSP. The low wattage solenoid features a DIN 43650 Form A electrical interface and is nylon encapsulated. FKM, NBR and EPDM 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.
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The Spartan Scientific Series 3516 2-Way, 2-Position Normally Closed or Normally Opened solenoid diaphragm process valve offers the highest flow for the smallest overall size in its class as compared to competitive units. The valve is designed from the ground up using modern design technologies and materials. The potable water brass body is media compatible, rugged and virtually indestructible. The body is available in 1/4”, 3/8” and 1/2” NPT. The low wattage solenoid features a DIN Style “A” EN175301-803 (Formerly DIN 43650) 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.
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The Spartan Scientific Series 3510 2-Way, 2-Position, internally piloted solenoid valve uses the latest technologies for materials and function. This combination provides the user with the highest quality, smallest size per Cv of flow and most competitive pricing of any valve on the market. The 3510 gives full flow throughout the pressure range starting with a Maximum Operating Pressure Differential of 1.5 psi while remaining sealed at 0 psi. The body is available in 1/4", 3/8" and 1/2" NPT sizes and features a stainless steel anti-flex ring for port strength. The molded pilot section features a push, non-locking manual override, high cycle life solenoid parts, and quick connect DIN Style “A” EN175301-803 (Formerly DIN 43650) or “flying lead” electrical connection options. Typical applications include air, emulsion, inert gases, oil and water control, condensate drainage, hot water plumbing and sprinkler systems.
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The Spartan Scientific Series 3505 is a 2-Way, 2-Position, internally piloted solenoid valve for the control of air, emulsion, inert gases and water. The valve features an all brass body and a full flow 1/2” orifice while maintaining a 1.5 minimum pressure differential. The design allows for a tight seal on the orifice at 0 psi. Available in 1/4”, 3/8” and 1/2” NPT, the 3505 can handle pressures to 230 psi. The encapsulated coil construction ensures that the valve functions well under long periods of activation (100% duty), as well as providing a high degree of environmental protection (NEMA 4). The inner valve functions as a direct assist using a flat diaphragm and orifice plate. Pressure differentials shift the valve to full open or full closed. A push, non-locking manual override is standard.
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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
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.