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  7. Pressure relief and pressure retention valve DAV with flow-back prevention
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Pressure relief and pressure retention valve DAV with flow-back preventionPressure relief and pressure retention valve DAV with flow-back prevention

1401 Pressure relief and pressure retention valve DAV with flow-back prevention

datasheet manual

Article No. DNPN
(bar)		L
(mm)		weight
(kg)		Availability watchlist
1401007000 1 1/2" 16 210 11.000 on demand
1401008000 2" 16 210 11.000 on demand
1401040000 40 16 200 15.750 on demand
1401050000 50 16 230 16.250 on demand
1401065000 65 16 290 21.300 on demand
1401080000 80 16 310 27.400 on demand
1401100000 100 16 350 35.400 on demand
1401125000 125 16 400 51.500 on demand
1401150000 150 16 480 76.000 on demand
1401200000 200 10 600 114.600 on demand
1401200016 200 16 600 114.600 on demand
1401250000 250 10/16 730 247.000 on demand
1401300000 300 10/16 850 359.000 on demand
DN
watchlist
1401007000 1 1/2"
PN16 bar
L210 mm
weight11.000 kg
Availabilityon demand
1401008000 2"
PN16 bar
L210 mm
weight11.000 kg
Availabilityon demand
1401040000 40
PN16 bar
L200 mm
weight15.750 kg
Availabilityon demand
1401050000 50
PN16 bar
L230 mm
weight16.250 kg
Availabilityon demand
1401065000 65
PN16 bar
L290 mm
weight21.300 kg
Availabilityon demand
1401080000 80
PN16 bar
L310 mm
weight27.400 kg
Availabilityon demand
1401100000 100
PN16 bar
L350 mm
weight35.400 kg
Availabilityon demand
1401125000 125
PN16 bar
L400 mm
weight51.500 kg
Availabilityon demand
1401150000 150
PN16 bar
L480 mm
weight76.000 kg
Availabilityon demand
1401200000 200
PN10 bar
L600 mm
weight114.600 kg
Availabilityon demand
1401200016 200
PN16 bar
L600 mm
weight114.600 kg
Availabilityon demand
1401250000 250
PN10/16 bar
L730 mm
weight247.000 kg
Availabilityon demand
1401300000 300
PN10/16 bar
L850 mm
weight359.000 kg
Availabilityon demand

Physical characteristics

  • The main valve is a hydraulically operating diaphragm valve. The work energy is the inherent medium.
  • Most valve types operate purely hydraulically without any foreign energy.

Application

  • To use in drinking water systems (other media after consultation)
  • Sustaining the network pressure in a supply and preventing any backflow
  • Protection of the network by releasing excess pressure, when the backflow also has to be simultaneously prevented

Mode of operation

  • The pressure relief valve maintains constant the pre-set inlet pressure (p1). Any excess system pressure is relieved by fast opening of the valve. The closing procedure is slow in order to avoid shock pressure loads. Variable flow rates have no effect on the maintained pressure which is regulated by the control valve. The overpressure or maintained pressure can be set within the range of 2 bar to 16 bar (standard design). The valve closes if a backflow enters the system (p1 is smaller than p2)

Product information

  • To calculate the dimensions of the valve please refer to the following information:
  • Maximum and minimum inlet pressure (static and dynamic pressure ratios)
  • Required sustained pressure or dischargepressure
  • Possible differential pressure with backflow
  • Maximum and minimum flow rates
  • Available line diameters and lengths
  • Construction of the valve (straight or angle design)
  • For the calculation basis, information on the loss of pressure and the characteristic values of the valve, please refer to the end of Chapter E.

Design

  • Design according to DIN EN 1074
  • Construction length acc. to DIN EN 558
  • Flange mass according to DIN 1092-2, to PN 25 DN 300
  • Pressure levels: PN 10 or PN 16 to DN 300, PN 25 to DN 200, higher pressures on request.
  • Nominal widths DN 50, DN 80, DN 100 and DN 150 available in angular design
  • Nominal widths 1 ½" and 2" with threaded connection (female thread)
  • Medium temperature up to 40°C

Installation and assembly

  • Shut–off valves should be fitted on both sides of the valve and a dirt trap should be installed on the inlet side of the valve. If the valve outlet flows to the outside or into a shaft, the outlet slider can be omitted. Depending on the installation situation, a mounting/dismounting adapter should be provided.

Vantages

  • Maintenance-free, non-rusting valve seat
  • Pressed-in seat
  • EWS-coating according to RAL GSK
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