WATTS DN15 DRV Pressure Reducer Instruction Manual
- June 4, 2024
- WATTS
Table of Contents
WATTS DN15 DRV Pressure Reducer
PARTS
- Tailpiece
- Seat
- Disk holder
- Spring guide
- Setting knob
Installation
APPLICATION RANGE
DRV/N reducers are designed to compensate the input pressure variations by varying head loss of head so as to maintain constant output pressure values. This type of reducer is mainly used for residential/community installations (EN1567).
DIMENSIONING
The reducer should be dimensioned on the basis of the required flow rate
(EN1567 or DVGW-appendix W314), and not on the basis of the nominal Pipe
diameter.
INSTALLATION
Horizontal installation (cap vertical) is advisable; however, the reducer can
also be installed vertically (cap horizontal). The reducer should be installed
betwean down-circuit of the water gauge and the filter (if any), avoiding
tension on the pipes. The down-circuit piping should not contain Curves of
elbows in a lenght at last 5 times the nominal diameter. For the purpose of
calibration and maintenance, a bypass tap should be ftted at the input and
output of the reducer. If the installation should be fitted with safety
valves, the DRVIN output pressure should be 20% lower than the safety valve
verification value.
The reducer is calibrated by adjusting the calibration cap with nil flow:
- turn cap towards+ (clockwise) =pressure increases
- turn cap towards -(anticlockwise) =pressure decreases
MAINTENANCE
When operated under correct conditions the pressure-reducing valve requires no special maintenance. However pressure-reducing valves can be affected by foreign matter. We recommend that a separate filter be fitted in line prior to the valve.
TECHNICAL SPECIFICATIONS
- Input pressure: max 25 bars (type testing DVGW 16 bars)
- Output pressure: adjustable from 1,5 to 6 bars
- Max. operating temperature: 30°C
- Employment: water
- Installation: any position
- Body: sanded brass, CW617N
- Spring cap: shockproof resin
- Flow rate: see table
DIMENSION
The cavitation diagram has been experimentally obtained by using 20 °C cold water. Higher water temperature promotes the cavitation phenomenon.
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