What are the standard nominal sizes for plastic float valves as per IS 10118?

The standard covers nominal sizes of 15 mm and 20 mm (Clause 4.1).

What is the hydrostatic pressure the valve body must withstand?

The valve body must withstand an internal hydrostatic pressure of 1.0 MPa for 2 minutes without any leakage (Clause 6.2.1).

What materials are permitted for manufacturing these valves?

The standard allows the use of suitable plastics such as Acetal Copolymer, Polypropylene (PP), or High-Density Polyethylene (HDPE) conforming to relevant IS codes (Clause 3).

Is there an endurance requirement for these valves?

Yes, the valve must successfully complete 200,000 opening and closing cycles without failure as per the endurance test (Clause 6.4).

IS 10118

: 1982

Plastic Float Valves for Plumbing Systems - Specification

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This standard specifies the requirements for materials, dimensions, construction, and performance of plastic float operated valves for use in domestic water supply systems, typically in storage cisterns. It covers valves of nominal sizes 15 mm and 20 mm for both low and high-pressure applications, and details the necessary tests to ensure their operational integrity and durability.

Covers requirements for plastic float valves used to control water level in cisterns and tanks.

Quick Reference Values

Nominal Sizes Covered15 mm and 20 mm

Body Hydrostatic Test Pressure1.0 MPa (10.2 kgf/cm²) for 2 minutes

Seat Leakage Test Pressure (High Pressure)0.7 MPa (7.1 kgf/cm²)

Seat Leakage Test Pressure (Low Pressure)0.05 MPa (0.51 kgf/cm²)

Endurance Test Cycles200,000 cycles

Maximum Working TemperatureAs agreed between purchaser and manufacturer

Practical Notes

Ensure compatibility of the plastic material with local water quality and any treatment chemicals (e.g., chlorine) to prevent premature degradation.

During installation, verify that the float arm has unrestricted movement within the tank to ensure proper shut-off and prevent continuous running.

Regularly inspect the valve seat and washer for debris or wear, which are common causes for slow leaks or failure to shut off completely.