Product catalog

Products

Reduced-pressure-zone backflow preventer BA, RPZ-Valve
More about the products
PROTECT RPZ backflow preventer, type BA, flanged, figure 361 01

PROTECT RPZ backflow preventer, type BA, flanged

figure 361 01

  • to protect drinking water against backflow of fluids up to and including category 4 according DIN EN 1717 / DIN 1988-100
  • wetted parts made of stainless steel
  • flange connection
  • inlet and outlet with check cartridge
PROTECT RPZ backflow preventer, type BA, union thread, figure 360 0G

PROTECT RPZ backflow preventer, type BA, union thread

figure 360 0G

  • to protect drinking water against backflow of fluids up to and including category 4 according DIN EN 1717 / DIN 1988-100
  • wetted metal parts made from dezincification-free and corrosion-resistant gunmetal, resistant against aggressive water
  • male union thread
  • inlet and outlet with check cartridge
FILL-MATIC 4 combi filling valve type BA for heating systems, figure 365 0G

FILL-MATIC 4 combi filling valve type BA for heating systems

figure 365 0G

  • to protect drinking water against backflow of fluids up to and including category 4 according DIN EN 1717 / DIN 1988-100
  • for heating water with inhibitors
  • wetted metal parts made from dezincification-free and corrosion-resistant gunmetal, resistant against aggressive water
  • consisting of shut-off, pressure reducing valve, RPZ backflow preventer Type BA and pressure gauge
  • male union thread
  • inlet and outlet with check cartridge
FK-4 RPZ backflow preventer outlet type BA, figure 367 01

FK-4 RPZ backflow preventer outlet type BA

figure 367 01

  • to protect drinking water against backflow of fluids up to and including category 4 according DIN EN 1717 / DIN 1988-100
  • wetted metal parts made from dezincification-free and corrosion-resistant gunmetal, resistant against aggressive water
  • inlet male pipe thread
  • suitable for connection to the elbow wallplates
FK-4 RPZ backflow preventer outlet type BA, figure 367 01 025

FK-4 RPZ backflow preventer outlet type BA

figure 367 01 025

  • to protect drinking water against backflow of fluids up to and including category 4 according DIN EN 1717 / DIN 1988-100
  • suitable for connection to the elbow wallplates
  • wetted metal parts made from dezincification-free and corrosion-resistant gunmetal, resistant against aggressive water
  • inlet male pipe thread
FK-4 RPZ backflow preventer outlet type BA, figure 367 01 050

FK-4 RPZ backflow preventer outlet type BA

figure 367 01 050

  • to protect drinking water against backflow of fluids up to and including category 4 according DIN EN 1717 / DIN 1988-100
  • wetted metal parts made from dezincification-free and corrosion-resistant gunmetal, resistant against aggressive water
  • inlet male pipe thread
RPZ backflow preventer outlet for appartments type BA, figure 368 02

RPZ backflow preventer outlet for appartments type BA

figure 368 02

  • for normative refilling of appartment heating installations
  • to protect drinking water against backflow of fluids up to and including category 4 according DIN EN 1717 / DIN 1988-100
  • suitable for connection to the elbow wallplates
  • with union adapter and collar for installation in cramped confines
  • made of brass, nickel plated
Products

Reduced-pressure-zone backflow preventer BA, RPZ-Valve

Fluid category 4 safety valves

KEMPER RPZ backflow preventers type BA protect drinking water from non-potable water up to and including fluid category 4.

Definition of fluid category 4 based on DIN EN 1717

Fluid that represents a health hazard for human beings through the presence of one or more toxic or very toxic substances or one or more radioactive, mutagenic or carcinogenic substances.

Practical use examples:

  • Chemical mixing means, e.g. disinfectants, fertilisers, etc.
  • Heating filling device, water with inhibitors
  • Non-certified softening systems
  • High-pressure cleaners

You can find more information on choosing the right safety valves in our guidebook.

Go to safety valves guidebook

How does an RPZ backflow preventer work?

RPZ backflow preventers are based on a three-chamber system with supply pressure, medium pressure and back pressure zones. The differential pressure controllers of the protection cartridge on the inlet side and the check valve (RV) on the outlet side ensure reliability and a high level of safety.

1. Rest position (under operating pressure)

If no removal of water occurs, the check and and bleeder valve are closed on the inlet and outlet sides.

2. Flow position

When water is being removed, the check valves on the inlet and outlet sides are open and the bleeder valve is closed.

3. Disconnection position

In the event of siphon backflow, the pressure on the inlet side drops. The bleeder valve reacts before the differential pressure falls below 140 mbar. The check valves on the inlet and outlet sides close, bleeder valve opens.