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Fluid Category 4 & RPZ Valves

Our comprehensive range of water solutions includes products that are specifically designed to provide backflow protection for Fluid Category 4 risks. These are fluids that pose a significant danger to health because of the concentration of toxic substances that they contain. This includes, for example, any fluid with pesticides (including herbicides and insecticides), chemical or carcinogenic substances or environmental organisms of potential health significance.

Our Fluid Category 4 products include Pent-A-Boost booster pumps, reduced pressure zone (RPZ) valves, Autofill units and DB pipe interrupters. To prevent contaminated water flowing backwards, the solutions feature an air gap Type AF or equivalent, or a mechanical valve arrangement. These systems are required for a variety of applications, including commercial heating systems, bottle washing apparatus, dyeing equipment, commercial dishwashing machines and brewery and distillation plants.

You will find our full range of RPZ valves and other Fluid Category 4 products on this section of our website. We are also able to manufacture bespoke assemblies, so if you can’t see solutions that match all of your practical requirements, don’t hesitate to contact us with your specifications. To discuss your options, simply get in touch with our expert team by phone or email.

Datasheets:
AutoFill
AutoFill AFCA
BA - RPZ Valve
DB256

Fluid Category 4 & RPZ Valves

9 Item(s)

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  • 15 mm RPZ Assy c/w Cabinet Grey 300x300x150

    Mechanical backflow preventer, housed in a tamperproof cabinet, approved for protection against backpressure and back siphonage for Fluid Categories 1 – 4. RPZ Valves (BA devices) are acceptable to all water companies in the U.K. - when installed and used in accordance with the Water Regulations. The "Option B" RPZ valve assembly includes upstream and downstream isolating valves, strainer and non-return valve. Arrow Valves RPZ cabinets provide a tamperproof environment as required by the Water Regulations. Learn More
    £620.00
  • 22 mm RPZ Assy c/w Cabinet Grey 300x300x150

    Mechanical backflow preventer, housed in a tamperproof cabinet, approved for protection against backpressure and back siphonage for Fluid Categories 1 – 4. RPZ Valves (BA devices) are acceptable to all water companies in the U.K. - when installed and used in accordance with the Water Regulations. The "Option B" RPZ valve assembly includes upstream and downstream isolating valves, strainer and non-return valve. Arrow Valves RPZ cabinets provide a tamperproof environment as required by the Water Regulations. Learn More
    £725.00
  • DN15 Pipe Interrupter DB CAT4 MBSP

    The type DB Pipe Interrupter is a backflow prevention device for specific Fluid Category 4 applications. The DB device is often fitted to a Hose Union Tap to improve the level of backflow protection. The principle is similar to traditional bicycle tyre valves, where the flow enters a tube with the far end blanked off. This tube has several small radial holes, over which a flexible tube is stretched. The forward flow lifts the flexible tube and pushes it against the outer vent holes. When the supply pressure is released, the flexible tube contracts venting the downstream and covering the inlet holes. The DB Pipe Interrupter is approved for back siphonage protection – not back pressure. DB Pipe Interrupters are generally used externally and must not be used for washing machines or any appliance that has a control valve or restriction. They are resistant to frost damage. Learn More
    £66.00
  • DN20 Pipe Interrupter DB CAT4 MBSP

    The type DB Pipe Interrupter is a backflow prevention device for specific Fluid Category 4 applications. The DB device is often fitted to a Hose Union Tap to improve the level of backflow protection. The principle is similar to traditional bicycle tyre valves, where the flow enters a tube with the far end blanked off. This tube has several small radial holes, over which a flexible tube is stretched. The forward flow lifts the flexible tube and pushes it against the outer vent holes. When the supply pressure is released, the flexible tube contracts venting the downstream and covering the inlet holes. The DB Pipe Interrupter is approved for back siphonage protection – not back pressure. DB Pipe Interrupters are generally used externally and must not be used for washing machines or any appliance that has a control valve or restriction. They are resistant to frost damage. Learn More
    £68.00
  • DN20 Pipe Interrupter DB CAT4 F Inlet - M

    The type DB Pipe Interrupter is a backflow prevention device for specific Fluid Category 4 applications. The DB device is often fitted to a Hose Union Tap to improve the level of backflow protection. The principle is similar to traditional bicycle tyre valves, where the flow enters a tube with the far end blanked off. This tube has several small radial holes, over which a flexible tube is stretched. The forward flow lifts the flexible tube and pushes it against the outer vent holes. When the supply pressure is released, the flexible tube contracts venting the downstream and covering the inlet holes. The DB Pipe Interrupter is approved for back siphonage protection – not back pressure. DB Pipe Interrupters are generally used externally and must not be used for washing machines or any appliance that has a control valve or restriction. They are resistant to frost damage. Learn More
    £73.00
  • Pipe Int. DB 1/2" Inter-Lock Hose Conn.

    The type DB Pipe Interrupter is a backflow prevention device for specific Fluid Category 4 applications. The DB device is often fitted to a Hose Union Tap to improve the level of backflow protection. The principle is similar to traditional bicycle tyre valves, where the flow enters a tube with the far end blanked off. This tube has several small radial holes, over which a flexible tube is stretched. The forward flow lifts the flexible tube and pushes it against the outer vent holes. When the supply pressure is released, the flexible tube contracts venting the downstream and covering the inlet holes. The DB Pipe Interrupter is approved for back siphonage protection – not back pressure. DB Pipe Interrupters are generally used externally and must not be used for washing machines or any appliance that has a control valve or restriction. They are resistant to frost damage. Learn More
    £87.00
  • Pipe Int. DB 3/4" Inter-Lock Hose Conn.

    The type DB Pipe Interrupter is a backflow prevention device for specific Fluid Category 4 applications. The DB device is often fitted to a Hose Union Tap to improve the level of backflow protection. The principle is similar to traditional bicycle tyre valves, where the flow enters a tube with the far end blanked off. This tube has several small radial holes, over which a flexible tube is stretched. The forward flow lifts the flexible tube and pushes it against the outer vent holes. When the supply pressure is released, the flexible tube contracts venting the downstream and covering the inlet holes. The DB Pipe Interrupter is approved for back siphonage protection – not back pressure. DB Pipe Interrupters are generally used externally and must not be used for washing machines or any appliance that has a control valve or restriction. They are resistant to frost damage. Learn More
    £94.00
  • DN15-50 RPZ Valve Assembly - Option "B"

    Mechanical backflow preventer approved for protection against backpressure and back siphonage for Fluid Categories 1 – 4. RPZ Valves (BA devices) are acceptable to all water companies in the U.K. - when installed and used in accordance with the Water Regulations. The "Option B" RPZ valve assembly includes upstream and downstream isolating valves, strainer and non-return valve. Learn More

    Price From: £345.00

  • DN65-200 RPZ Valve Assembly - Option "B"

    Mechanical backflow preventer approved for protection against backpressure and back siphonage for Fluid Categories 1 – 4. RPZ Valves (BA devices) are acceptable to all water companies in the U.K. - when installed and used in accordance with the Water Regulations. The "Option B" RPZ valve assembly includes upstream and downstream isolating valves, strainer and non-return valve. Learn More

    Price From: £4,670.00

Fluid Category 4 & RPZ Valves

9 Item(s)

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