Water Pressure Regulator*- Series 25AUB
*A water saving test program concluded that reducing the supply pressure from 80 to 50 psi (551 - 346 kPa) resulted in a water saving of 30%.
Series 25AUB water pressure reducing valves are suitable for initial water pressures up to 300 psi (21.09 bar) and can be adjusted from 25 to 75 psi (172 to 517 kPa) delivery pressure to the system. The standard setting is 50 psi (345 kPa). They are standardly furnished with a bronze body, union threaded female inlet and female threaded outlet connection, stainless steel seat and strainer. All parts are easily and quickly serviceable without removing the valve from the line. The built-in by-pass prevents buildup of excessive system pressure caused by thermal expansion.
OPTIONS:½" to 2" (15-50mm) - Add suffix:
| DU | - | Threaded female union inlet and outlet connections |
| G | - | Gauge tapping. |
| GG | - | Gauge tapping and 160 psi (11.02 bar) gauge |
| HP | - | Hi-pressure range 75-125 psi (5.27-8.79 bar) |
| LP | - | Low pressure range of 10-35 psi (69-241 kPa). Set at 30 psi (207 kPa) no-flow pressure. Max pressure 100 psi (6.9 bar). Max temperature 160°F (71°C). |
| S | - | Solder union inlet x NPT female outlet connections. |
| S-DU | - | Solder union inlet and outlet connections. |
OPTIONS:½" to 1" (15-25mm) - Add suffix:
| SC | - | Sealed spring cage for hi-rise applications |
| Z3 | - | For waterworks pit installations. Has sealed spring cage and corrosion resistant adjusting & cage screws |
| Z7 | - | For 400 psi (27.6 bar) initial pressure, ¾" (19mm) only |
- Single union inlet connection
- Double union connections (inlet and outlet) - Option DU
- Integral stainless steel strainer, removable when bottom plug is removed
- Renewable stainless steel seat
- Bronze body construction
- Serviceable in line
- Bypass feature for thermal expansion pressure
When the supply main pressure exceeds 60 psi (413 kPa), an approved water pressure reducing valve and strainer shall be in-stalled in the water service pipe near its entrance to the building to reduce the water pressure to 50 psi (345 kPa) or lower. Sill cocks and outside wall hydrants may be left on full main pressure at the option of the owner.
For service water systems up to and including 2" (50mm) provision shall be made to permit the by-pass flow of water around the valve back into the supply main when pressures, due to thermal expansion on the outlet side of the valve, exceed the pressure in the supply main. Pressure reducing valves with built-in bypass check valves will be acceptable.
Approved valves shall comply with ASSE 1003 - Watts No. 25AUB.
- Bronze body construction
- Renewable stainless steel seat
- Renewable stainless steel integral strainer screen
- Reinforced Nordel diaphragm ½" - 1" (15-25mm)
- Reinforced Buna ‘N’ diaphragm 1 ¼" - 2" (32-50mm)
- Buna ‘N’ valve disc
- Suffix LP: Special T.F.E. heat protected diaphragm for hot or cold water service.
Initial Pressure:
Suitable for supply pressures up to 300 psi (21.09 bar)
Reduced Pressure:
Adjustable reduced pressure range 25-75 psi (1.76-5.27 bar)
Standard setting 50 psi (3.52 bar)
Maximum Temperature:
160°F (71°C)
Meets requirements of ASSE Standard 1003; (ANSI A112.26.2); CSA Standard B356; Southern Standard Plumbing Code and listed by IAPMO.
Military Standard MIL-V-18146B Type I..
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