Products

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

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

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

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

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

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

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

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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.