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4
Installation and Adjustment
The pressure reducer is set at the factory to a secondary pressure of 3 bar (in stan-
dard version) and is to be installed in the pipe without applying stress. After the
reducer we recommend to consider a slow downsection of 5 x DN.
The flow direction must coincide with the arrow on the housing. The valve can be
installed in any mounting position.
The pipe must be thoroughly flushed prior to installation of the pressure reducer to
prevent impurities picked up by the medium having an impact on the satisfactory
operation.
The pressure gauges are screwed into the sockets using hempor gasket strip and
indicate the prevailing secondary pressure (Fig. 681/481/682/482) or the prevailing
primary and secondary pressure (Fig. 382 and Fig. 682/482 DN65/DN80/DN100).
The desired secondary pressure is set by turning the adjusting spindle at idle pres-
sure (zero consumption). For Fig. 382, a presetting in the de-pressurised state is
possible by means of a setting scale.
Turning the adjusting spindle in clockwise direction increasesthe secondary pressure
and turning the spindle in counter-clockwise direction reduces the secondary pres-
sure. The set desired value can be checked at the pressure gauge arranged on the
secondary pressure side.
Caution!!!
Before commissioning the pressure reducer, it should be ensured that both
pressure gauge connections on the housing are sealed with pressure gauges or
sealing plugs.
5
Maintenance
According to DIN EN 806-5, an annual inspection and service at least must be per-
formed, in order to correct possible malfunctions that which can arise due to dirt,
corrosion, calcification and natural wear. This interval may be shortened, depending
on the operating conditions.
During this service, the sieve (Fig681/481/682/482) must be cleaned, the good
condition of the valve insert must be checked and if necessary must be replaced.
After long periods of non-use the function of the valve must be tested.
Caution!!!
When carrying out assembly work on the pressure reducer the corresponding
system part must always be relieved of pressure and emptied, depending on the
medium used.
Assembly and maintenance instructions - 382, 481/681, 482/682 | Version: 06/2023 · V02
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