WATTS DRV Diaphragm Pressure Reducing Valve Instruction Manual
- June 4, 2024
- WATTS
Table of Contents
WATTS DRV Diaphragm Pressure Reducing Valve
OVERVIEW
- Tailpiece
- Seat
- Disk holder
- Spring guide
- Setting screw
Recommendations on installation
- Ball valve
- Check valve
- Filter
- Pressure reducing valve
- Water hammer arrester
APPLICATION RANGE
DRV reducers are designed to compensate the input pressure variations by varying head loss of head so a sto 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 DGW- 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 between the down-circuit of the water gauge and the filter (f any), avoiding tension on the pipes. The down circuit piping should not contain curves or elbows in a length at least 5 times the nominal diameter. For the purpose of calibration and maintenance, a bypass tap should be fitted at the input and output of the reducer. If the installation should be fitted with safety valves, the DRV output pressure should be 20% lower than the safety valve verification value. The reducer is calibrated by adjusting the calibration screw with nil flow:
- Pressure increase See SE 1
- Pressure Decrease see SEQ 2
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 SPECIFICATION
- Input pressure: max 25 bars (type testing DVGW 16 bars)
- Output pressure: adjustable from 1.5 to 6 bars
- Output pressure presetting: 3 bars
- Max. operating temperature: 60C (DVGw 30C)
- Employment: water
- Installation: any position
- Body and spring cap: sandblasted brass, Cw617N
- Flow rate: see table
TESTS
DVGW brand for all dimensions. DIN 4109 standard classifies the diameters required for this test, i.e. ½” to 1 ¼” in class 1 as regards low noise.
References
Read User Manual Online (PDF format)
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