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Diaphragm Valve & Stager Control > K520 Series

Product Information

AquaMatic series K520 composite valves are designed to handle deionized water as well as acids, caustic harsh chemicals or gases that would rapidly corrode metal valves. The valves are constructed of corrosion-resistant materials, but still have all of the advantages of unparalleled AquaMatic metal body valve design, along with their own design advantages. The K520 series valve body and cap are molded with glass-filled Noryl* thermoplastic.

* Noryl is a trademark of General Electric Company.

K520 Series Features and Options
  • Low Pressure Loss
    Y-pattern diaphragm valve, with large seat opening and high lift
    disc permits higher flow rates at lower pressure loss than other
    comparable valves.
  • Positive Control
    Separate flow and control chambers permit positive closing without
    springs; and only nominal cost for spring assist opening for low-pressure and self-draining applications.
  • Cost-Effective Design
    The K520 series valve is a cost-effective solution in initial purchase price as well as in lifetime maintenance. All components can be serviced while the valve is in-line.
  • Separate Diaphragm Chambers
    Separate diaphragm chambers protect the valve diaphragm from the flow stream. This allows the diaphragm to be replaced without disrupting service.
  • Long Diaphragm Life
    Pre-formed, stress relieved diaphragm minimizes fatigue, maximizes valve responsiveness and diaphragm lifetime.
  • Corrosion Resistant
    All internal parts in contact with media are made of composite materials. Seals are ethylene propylene for better chemical resistance**.

  • Pipe Sizes
    Series K520 valves are available in four different sizes, from 1/2-inch to 2-1/2-inch. A variety of available end connectors makes the valve compatible for 3/8-inch to 3-inch pipe sizes.
  • Design/Application Services
  • Optional Position Indicators
  • Optional Spring Assist
  • Optional Adjustable Flow Control
  • Optional Seal and Diaphragm Materials for Special Applications
  • Adaptable to a Wide Variety of Control Devices

**Valves are NOT recommended for use with any aromatic hydrocarbon based media.

Operating Specifications
Maximum pressure: 125 PSI (8.6 bars)
Maximum temperature: 140F (60C)
Operation: The K520 series valve is closed by introducing either hydraulic or pneumatic pressure to the upper diaphragm chamber. The control pressure must be equal to or greater than the line pressure. The valve is opened by relieving the pressure from the upper diaphragm chamber. The line pressure under the seat will then open the valve. The unique AquaMatic Y-pattern design minimizes pressure loss in the valve.

Available Valve Options
  • Normally Open (Standard)
  • Normally Closed
  • Spring Assist Closed
  • Spring Assist Open
  • Limit Stop Flow Control
  • Position Indicator
  • Optional Seals Material
Ordering Information

To order the K520 series valve, you will need to specify:

  • Valve Size
  • Valve Option
  • Working Pressure and Temperature
  • Type of End Connections
Typical Applications
  • Water Treatment Systems
  • Deionizers
  • Chemical Injection
  • Desalinization
  • Evaporation
  • Metal Recovery Systems
  • Process Water Systems
  • Mining Wastes
  • Level Control Systems
  • Fertilizer Spray Equipments
  • Electronic Industry
  • Detergent and Bleach Handling
Flow Capabilities of K520 Plastic Diaphragm Valves

Dimensions for K520 Series Valves

Valve Series Units Length A Length B Length C
K520 inches (mm) 7.00 (177.8) 2.62 (66.5) 4.87 (123.7)
K521 inches (mm) 9.00 (228.6) 4.06 (103.1) 6.31 (160.3)
K524 inches (mm) 12.50 (317.5) 5.06 (128.5) 9.31 (23.5)

Valve Series Units Length A Length B Length C
K520 inches (mm) 7.00 (177.8) 2.62 (66.5) 3.93 (99.8)
K521 inches (mm) 9.00 (228.6) 4.06 (103.1) 4.50 (114.3)
K524 inches (mm) 13.25 (336.5) 5.05 (128.5) 7.75 (196.8)

Valve Series Pipe Size Units Length A Length B
K524 2" inches (mm) 10.50 (266.7) 5.06 (128.5)
K526 2-1/2" inches (mm) 15.00 (381.0) 7.31 (185.7)

Valve Series Pipe Size Units Length A Length B
K524 2" inches (mm) 10.50 (266.7) 5.06 (128.5)
K526 2-1/2" inches (mm) 15.00 (381.0) 7.31 (185.7)

Valve Series Pipe Size Units Length
Thk. D B.C. Dia. E Dia.
K524 2" inches (mm) 9.00 (226.6) 5.06 (128.5) 6.00 (152.4) .75 (19.05) 4.750 (120.85) .688 (17.48)
K526 2-1/2" inches (mm) 11.37 (288.8) 7.31 (185.7) 6.94 (176.3) .94 (23.9) 5.500 (139.7) .688 (17.48)
K526 3" inches (mm) 12.37 (314.2) 7.31 (185.7) 7.38 (187.5) 1.81 (185.7) 6.000 (152.4) .750 (19.05)

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