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Assembly and maintenance instructions - 481/681, 482/682
3
Installation and Adjustment
The pressure reducer is set at the factory to a secondary pressure of 3 bar (in
standard 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. 682/482 DN 65 / DN 80 / DN 100). The
desired secondary pressure is set by turning the adjusting spindle at idle pressure
(zero consumption).
Turning the adjusting spindle in clockwise direction increasesthe secondary pres-
sure and turning the spindle in counter-clockwise direction reduces the secondary
pressure. During this adjustment always observe that, based on pressure and fric-
tion losses, the end pressure adjusted at zero consumption is reduced further when
drawing water, in dependence of the quantity drawn off. 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.
Pressure reducer 682 / 482
DN
15
20
25
32
40
50
65
80
100
Installed length L
130
150
160
180
200
230
290
310
350
Weight in kg
2,5
4,2
4,7
5,9
8,6
10,5
20
22
40
Field of use
Water, neutral and non-adhesive liquids, compressed air,
neutral and non-combustible gasses
Primary pressure
up to 16 bar (PN 16); up to 40 bar (LP up to 25 bar) (PN 40)
Secondary pressure
SP: 1 - 8 bar
HP: 5 - 15 bar
LP: 0,5 - 2 bar
Materials
Gunmetal / stainless steel or stainless steel / stainless steel
Temperature range
up to 95 °C (DVGW up to 80 °C)
