IS 9758:1981 is the Indian Standard (BIS) for flush valves and fittings for water closets and urinals. This standard specifies the material, construction, performance, and testing requirements for manually operated flush valves (flushometers) used with water closets and urinals. It covers aspects like flow rate, flush duration, and durability to ensure proper and efficient flushing in plumbing systems.
flush valves and fittings for water closets and urinals
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Endurance Test (WC Valve) | 50,000 cycles | 500,000 cycles | ASME A112.18.1 |
| Hydrostatic Body Pressure Test | 1.0 MPa (approx. 145 psi) | 1.6 MPa (approx. 232 psi) | BS EN 12541:2002 |
| Endurance Test (Urinal Valve) | 100,000 cycles | 200,000 cycles | BS EN 12541:2002 |
| Flush Volume (Urinal) | 2.0 to 4.0 litres | Typically ≤ 1.9 litres, down to 0.5 litres for high-efficiency models | ASME A112.18.1 (referencing EPA WaterSense) |
| Acoustic Performance (Noise Level) | Not specified | Required; classified into Acoustic Group I (≤ 20 dB) or Group II (≤ 30 dB) | BS EN 12541:2002 |
| Minimum Flow Rate (WC Valve) | 1.2 litres/second at 0.05 MPa | Performance-based; flow rate is specified by manufacturer and must be consistent, not a mandated minimum. | BS EN 12541:2002 |
| Materials for Waterway Surfaces | Prescribed alloys like Leaded Tin Bronze Grade LTB 2 of IS 318 | Performance-based; must comply with standards for contact with potable water (e.g., NSF/ANSI/CAN 61) | ASME A112.18.1 |