Valves - Spartan Scientific

Valves control, regulate, or direct the flow of fluids, such as water, gas, and other substances. They work by opening, closing, or obstructing passageways using flaps or other movable parts. There are three main t...

Categories from Spartan Scientific (6)
Solenoid Valves

Solenoid valves provide fast, reliable on/off control of liquids and gases by utilizing an electric coil to actuate the valve. Compact and efficient, they integrate seamlessly into automated systems for applications such as cooling, lubrication, chemical dosing, and process isolation. Available in a variety of materials and designs to handle different pressures, temperatures, and media.

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.

Pilot Valves

Pilot valves are critical for operating larger valves or control actuators in fluid control systems. These valves act as control mechanisms, receiving signals from external devices such as sensors, controllers, or other valves and initiating the opening or closing of the main valve or actuator. Pilot valves are commonly used in applications where high-pressure fluids or significant flow rates are involved, such as hydraulic systems, pneumatic systems, and industrial machinery. They provide reliable and precise control, ensuring efficient operation and safety. With various configurations and actuation methods available, including solenoid-operated, manual, or pilot-operated, pilot valves offer versatility and flexibility to meet specific system requirements.

Drain Valves

Drain valves are essential components in fluid management systems, designed to control the flow and drainage of liquids and gases. These valves play a crucial role in various industries, ensuring the safe and efficient removal of unwanted fluids from pipelines, tanks, and other equipment. Whether it's for industrial, commercial, or residential applications, reliable drain valves help prevent leaks, maintain optimal system performance, and safeguard against potential hazards. With a wide range of materials, sizes, and configurations available, finding the perfect drain valve to suit specific needs has never been easier. Choose high-quality drain valves to enhance fluid control and maintain the integrity of your operations.

Valve Accessories

Valve accessories are additional components that enhance the functionality and performance of valves in fluid control systems. These accessories are designed to provide other features, improve safety, or simplify maintenance of the valves. Valve accessories enhance the reliability, efficiency, and safety of valve operations, making them essential for various industries such as oil and gas, chemical processing, water treatment, and power generation.

Proportional Valves

Proportional valves are advanced control valves that provide precise and proportional control over fluid flow rates or pressures. These valves are designed to accurately regulate the flow or pressure of liquids or gases in various industrial applications. Proportional valves offer the ability to adjust the valve opening or position in proportion to an input signal, typically an electrical or analog signal. This allows for fine-tuned control and modulation of the flow or pressure, enabling precise adjustments based on system requirements. Proportional valves are commonly used in automation, robotics, process control, and hydraulic systems, where precise and dynamic control is essential for optimal performance.

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Diaphragm Process Valve, 2-way, 2-position, Normally Closed
Sale Price:

$69.26$72.72

Regular Price: $72.72, you save $3.46 (5%)
Available for Purchase

Subject to factory lead times

The Spartan Scientific Series 35G5 2-Way, 2-Position all stainless-steel solenoid diaphragm valve offers the highest flow for the smallest size in the industry, with the 316 stainless steel body and bonnet. The valve is designed from the ground up using modern design technologies and materials. Featuring a full flow 1/2” (12.5 mm) orifice, available in Normally Closed configurations. The rugged stainless body is media compatible, robust, and is designed to meet rigorous flow requirement up to 29 GPM @ 150 PSI water. The body is available in 1/4”, 3/8” and 1/2” NPT, and the low wattage solenoid features a DIN Style “A” EN175301-803 (Formerly DIN 43650) electrical interface and is nylon encapsulated. FKM, NBR and EPDM are standard elastomers, and the operators are made of stainless steel with copper shading rings for AC versions. Typical applications include control of inert gases, water, and compatible fluids.
Sale Price:

$451.39$473.98

Regular Price: $473.98, you save $22.59 (5%)
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.
Sale Price:

$161.40$169.48

Regular Price: $169.48, you save $8.08 (5%)
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.
Sale Price:

$156.95$164.80

Regular Price: $164.80, you save $7.85 (5%)
Available for Purchase

Subject to factory lead times

Diaphragm Process Valve, 2-way, 2-position, Normally Closed, Composite Valve Body
Sale Price:

$167.24$175.61

Regular Price: $175.61, you save $8.37 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$40.76$42.80

Regular Price: $42.80, you save $2.04 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$40.76$42.80

Regular Price: $42.80, you save $2.04 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$40.76$42.80

Regular Price: $42.80, you save $2.04 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Open
Sale Price:

$40.76$42.80

Regular Price: $42.80, you save $2.04 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$46.88$49.22

Regular Price: $49.22, you save $2.34 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$46.88$49.22

Regular Price: $49.22, you save $2.34 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed, Composite Valve Body
Sale Price:

$42.48$44.60

Regular Price: $44.60, you save $2.12 (5%)
Available for Purchase

Subject to factory lead times

Diaphragm Process Valve, 2-way, 2-position, Normally Closed
Sale Price:

$69.26$72.72

Regular Price: $72.72, you save $3.46 (5%)
Available for Purchase

Subject to factory lead times

The Spartan Scientific Series 35G5 2-Way, 2-Position all stainless-steel solenoid diaphragm valve offers the highest flow for the smallest size in the industry, with the 316 stainless steel body and bonnet. The valve is designed from the ground up using modern design technologies and materials. Featuring a full flow 1/2” (12.5 mm) orifice, available in Normally Closed configurations. The rugged stainless body is media compatible, robust, and is designed to meet rigorous flow requirement up to 29 GPM @ 150 PSI water. The body is available in 1/4”, 3/8” and 1/2” NPT, and the low wattage solenoid features a DIN Style “A” EN175301-803 (Formerly DIN 43650) electrical interface and is nylon encapsulated. FKM, NBR and EPDM are standard elastomers, and the operators are made of stainless steel with copper shading rings for AC versions. Typical applications include control of inert gases, water, and compatible fluids.
Sale Price:

$451.39$473.98

Regular Price: $473.98, you save $22.59 (5%)
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.
Sale Price:

$161.40$169.48

Regular Price: $169.48, you save $8.08 (5%)
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.
Sale Price:

$156.95$164.80

Regular Price: $164.80, you save $7.85 (5%)
Available for Purchase

Subject to factory lead times

Diaphragm Process Valve, 2-way, 2-position, Normally Closed, Composite Valve Body
Sale Price:

$167.24$175.61

Regular Price: $175.61, you save $8.37 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$40.76$42.80

Regular Price: $42.80, you save $2.04 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$40.76$42.80

Regular Price: $42.80, you save $2.04 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$40.76$42.80

Regular Price: $42.80, you save $2.04 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Open
Sale Price:

$40.76$42.80

Regular Price: $42.80, you save $2.04 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$46.88$49.22

Regular Price: $49.22, you save $2.34 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed
Sale Price:

$46.88$49.22

Regular Price: $49.22, you save $2.34 (5%)
Available for Purchase

Subject to factory lead times

Direct Acting Valve, 2-Way, 2-Position, Normally Closed, Composite Valve Body
Sale Price:

$42.48$44.60

Regular Price: $44.60, you save $2.12 (5%)
Available for Purchase

Subject to factory lead times