IS 9739:1981 is the Indian Standard (BIS) for pressure-reducing valves for domestic water supply systems. This standard specifies the requirements for materials, dimensions, construction, and performance of direct-acting, spring-loaded pressure-reducing valves (PRVs) for domestic water supply systems. It covers valves from 15mm to 50mm nominal size, intended for a maximum working pressure of 1.6 MPa, and outlines testing procedures to ensure their reliability.
pressure-reducing valves for domestic water supply systems
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Hydrostatic Body Test Pressure | 3.0 MPa (30 bar) for a 2.0 MPa rated valve (1.5 x max working pressure) | 2.4 MPa (24 bar) for a PN16 rated valve (1.5 x PN) | BS EN 1567:2000 |
| Endurance Test Cycles | 10,000 cycles | 50,000 cycles | ASSE 1003-2016 |
| Acoustic Performance Test | Not specified | Required, classified into Groups I (≤20 dB(A)), II (≤30 dB(A)), etc. | BS EN 1567:2000 |
| Static Pressure Increase (Creep) | Not specified with a quantitative limit | Downstream pressure must not exceed set pressure by more than 0.1 MPa (1 bar) | BS EN 1567:2000 |
| Outlet Pressure Adjustment Range | Not explicitly defined (typically 0.05 - 0.55 MPa) | Defined in ranges, e.g., 0.1 - 0.6 MPa (1 - 6 bar) | BS EN 1567:2000 |
| Lead Content in Materials | Not specified | Must comply with 'lead-free' regulations (e.g., ≤ 0.25% weighted average lead content) | ASSE 1003-2016 |
| Maximum Working Temperature (Standard) | Not specified (ambient) | 30 °C (with optional tests for higher temperatures) | BS EN 1567:2000 |