Pressure reducing valves : applications guide

THE PRESSURE REDUCING VALVE : DEFINITION

WATER SAVINGS

PRESSURE REDUCING VALVES OR REGULATORS ?

WATTS, THE INVENTOR OF THE REGULATOR

HOW TO CHOOSE THE DIAMETER OF PRESSURE REDUCING VALVES ?

INSTALLATION

HOW TO ADJUST A PRESSURE REDUCING VALVE ?

PRECAUTION

PRESSURE GAUGE : THE ESSENTIAL ACCESSORY

EUROPEAN STANDARD EN 1567 AND THE BRAND NF

SANITARY CONFORMITY (ACS / WRAS)

PRESSURE REDUCING VALVE, THE WATTS INDUSTRIES EXPERTISE

CASE OF ELECTRICAL HOT WATER STORAGE HEATER

CASE OF TOWER BLOCKS

APPLICATIONS GUIDE

PRECAUTIONS

WATTS INDUSTRIES direct action water pressure reducing valves are insensitive to scale or impurities, and need no maintenance or particular precautions provided that they are installed according to the rules of the trade.

However, if there is a risk of back pressure or water hammer in the downstream circuit, you are advised to protect the pressure reducing valve by a non-return valve placed immediately downstream.

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PRESSURE GAUGE :
THE ESSENTIAL ACCESSORY

The pressure gauge allows direct reading of the pressure, and thus allows precise adjustment of the pressure reducing valve to local installation conditions.
WATTS INDUSTRIES designs, manufactures and markets a wide range of pressure gauges for buildings and industry.

Over the years, through the successive acquisition of FIMET and the German company Förster & Rothmann, the WATTS INDUSTRIES group has become a key player in the European instrumentation market.

The pressure gauge should not remain under pressure — the installation of an isolating valve is recommended.

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EUROPEAN STANDARD EN 1567 AND THE BRAND NF

The brand NF guarantees the observance of standards for using household electrical appliances and taps.

PRECISIO has the right to use the NF EN 1567 brand, and ensures user comfort and preservation of installations : by distributing a normal flow rate during simultaneous drawings, thanks to its low load loss.

PRECISIO reduces the noise of running water. It facilitates the adjustment of mixers, by reducing the water hammer effect and avoiding ratting and vibrations in the pipes, characteristic phenomena of excessive pressure.

PRECISIO helps towards saving water by avoiding waste (leakage from pipes, taps and toilet flushers).

Through its design, it keeps its characteristics in time regardless of the water quality.

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SANITARY CONFORMITY (ACS / WRAS)

These certificates assure the conformity approval -
according to local requirements - A.C.S. (F) and WRAS (GB).

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PRESSURE REDUCING VALVES, THE WATTS INDUSTRIES EXPERTISE

WATTS, inventor of the modern pressure reducing valve concept, designs and manufactures a complete range for all needs.

WATTS pressure reducing valves offer :

- The best for you and your customers, because depending on quality products ensures peace of mind.

- Easy installation: PRECISIO and REGLEAU are interchangeable with the main pressure reducing valves on the market. They can be installed in all positions.

- Savings : WATTS pressure reducing valves are sold at a competitive price. They ensure real water savings for your customers. They pay for themselves quickly.

- Conformity to standards, the quality of the materials used, the NF brand, the health conformity attestation, etc. are all guarantees for your installations.

- Reliability: manufacturing under quality assurance ISO 9001 (version 2000) in our plant at Fressenneville.

- By experience acquired on the job, the success of REDUFIX is due to installers insisting on this product, with more than 20 years on the market.

CASE OF ELECTRICAL HOT WATER STORAGE HEATERS :

As the water temperature increases, the pressure also rises within the heater chamber (water expansion).

For safety reasons, this pressure must be limited to a value under the safety pressure of the tank.
This function is ensured by the safety unit valve, which is set at 7 bars (Standard NF-D 36401 -EN1487).

An aggravating factor — the consumption of water during the night drops considerably, which has the consequence of increasing pressure in the public drinking water network.

Now, it is generally during the night that the heating period is triggered (case of electric meters with off-peak time rates).

Thus the heating of the water adds to the increase of water mains pressure, and causes the pressure in the tank to reach the safety valve set-point, producing a water outflow higher than water expansion.

To avoid this water outflow (drinking and heated),
it is necessary to install a pressure reducing valve, that will protect the immersion tank from excess pressure.

REDUFIX is an especially designed pressure reducing valve for this function.

It is a good-looking design, very discreet and compact, perfect to built-in under electrical immersion heaters.

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