d en-drv gb - Watts Industries

PREssuRE REDuciNg VAlVE • EN-DRV
2
Application:
• The pressure reducing valve EN-DRV is designed for water systems.
The device reduces and stabilizes automatically the outlet pressure at the set value. It effectively prevents
damages that can be caused by pressure increase. The pressure reducing valve EN-DRV reduces the water
consumption.
• Medium : water.
Working principle :
pressure adjusting
knob
upstream
downstream
Without flow :
The spring, in relation with the size of the diaphragm,
helps the downstream pressure to push the
diaphragm upwards.
The obturator is closed.
The pressure is maintained at the calibrated value.
With flow :
The force of the diaphragm operates against the
force of the adjustment spring.
The strength of the spring moves downwards the
obturator, allowing the water to pass. If the outlet
pressure and therefore diaphragm force fall because
water is drawn, the greater force of the spring
causes the opening of the valve.
Design:
✓ Robust and low complexity construction providing superior reliability and longevity.
✓ Compact and light weight: competitive valve price.
✓ Removable modular cartridge with adjustment knob and setting scale.
✓ Made in non-stick materials.
✓ Minimizes the limescale deposit.
✓ Can be easily removed for inspection or maintenance operations.
✓ Set pressure is directly indicated on the set point scale.
✓ Factory setting: 3 bar.
✓ Simple adjustment for installer.
✓ Dezincification resistant brass housing.
Features and benefits:
- The balancing principle:
EN-DRV range is based on the balancing of two opposing
forces:
➪ the strength of the inlet pressure towards the closing of
the seat, and on the top of the piston,
➪ the equal surface area of the upper side of the piston
and for the obturator.
Compensated seats
With this principle of compensated seats, the set pressure
is maintained constant, even when there is an important
inlet pressure fluctuation.
- The pressure set is maintained at a constant level:
• over-pressure damages are avoided,
• lower flow noises in the installation,
• water consumption is reduced.