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General
The Oras standard pressure valve is designed to
lower water pressure to a piping system's default
value. Its primary application is for installation on
household pipework in buildings that meet Finnish
Building Code D1 (which in turn satisfies the DIN
4109 standard for noise protection in buildings).
I n s t a l l a t i o n
Select a place for the valve such that any
required adjustments and servicing can be
carried out easily. Flush the piping carefully prior
to installation. The water flow direction is marked
with an arrow on the valve body. Make sure that
no tension remains in the valve after installation.
Secondary pressure
The standard pressure valve's secondary
pressure is factory preset at 400 kPa and can be
adjusted from 150-600 kPa. First ensure that
primary pressure is at least 100 kPa higher than
the desired secondary pressure. If a by-pass
valve is installed after the standard pressure
valve, secondary pressure must not exceed 80%
of the by-pass valve's relief pressure.
Servicing
Under normal conditions, the standard pressure
valve requires no special servicing. The cartridge
and its filter need to be cleaned once or twice a
year depending on water quality. First detach the
cartridge from the valve as shown in the figures.
Clean out any dirt in the valve body. If the
cartridge is damaged, change it for a new one.
Possible problems, their causes and
repair instructions
Secondary pressure rising above the set value
may be due to rising water temperature in a
heating device installed on the secondary side.
Heated water expands, and the pressure gauge
shows a rise because the one-way valve is not
tight enough. This does not affect the functioning
of the standard pressure valve in any way. It is
relatively easy to check whether pressure has
been raised by the heater, by simply switching it
off. If pressure continues to rise, this may be due
to dirt in the standard pressure valve itself. The
cartridge then needs to be cleaned.
Construction
The Oras standard pressure valve is a balanced
socket valve with a coaxial filter. The valve body
is red brass and the inner parts are of high-
quality corrosion-resistant material. All the
sealing materials are non-ageing elastomer. The
membrane is fibre-strengthened plastic. The
adjustment wheel and spring cap are of fibre-
glass strengthened plastic.
Primary pressure: max. 1600 kPa
Secondary pressure: adjustable 150-600 kPa
kPa
Pressure difference: min. 100 kPa
Reduction ratio: max. 10:1
Working temperature: max. +60 °C
I n s t a l l a t i o n p o s i t i o n : f r e e
Capacity: see table
Accessories: pressure gauge 0...10 bar,
G1/4, Oras no. 436 012
Spare parts:
DN 15 Oras no. 438 693
DN 20 Oras no. 438 693
DN 25 Oras no. 438 694
DN 32 Oras no. 438 686
DN 40 Oras no. 438 686
DN 50 Oras no. 438 686
D
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factory default 400
Cartridge
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