What are the standard sizes for these float valves?

The standard covers nominal sizes of 15 mm and 20 mm (Clause 5.1).

What is the required hydrostatic body test pressure?

The valve body must withstand an internal hydrostatic pressure of 1.0 MPa for 2 minutes without leakage or damage (Clause 7.2).

How is the valve's durability verified?

Through an endurance test, where the valve must complete 200,000 opening and closing cycles without failure (Clause 7.5).

What kind of plastic is specified for the valve body?

Suitable plastics include Acetal Copolymer (POM) or Glass-Filled Nylon, as specified in Clause 4.2.

IS 13049

: 1991

diaphragm type (plastic body) float-operated valves for complex water services

CurrentSpecializedSpecificationBIMMEP · Sanitary Appliances and Water Fittings

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This standard specifies the requirements for diaphragm-type, float-operated valves with plastic bodies, intended for use in cold water services, particularly for water closets and flushing cisterns. It covers materials, dimensions, construction, performance tests, and marking for nominal sizes of 15 mm and 20 mm.

diaphragm type (plastic body) float-operated valves for complex water services

Quick Reference Values

Nominal Sizes Covered15 mm and 20 mm

Hydrostatic Test Pressure1.0 MPa (for 2 minutes)

Endurance Test Cycles (Minimum)200,000 cycles

Minimum Flow Rate (15mm size at 0.05 MPa)0.23 l/s

Maximum Working Pressure0.5 MPa

Maximum Water Temperature30 °C

Practical Notes

These valves are intended for low to medium pressure applications (up to 0.5 MPa) and should not be used in high-pressure systems.

The plastic construction offers excellent corrosion resistance but may be susceptible to degradation from UV exposure or certain chemicals.

Ensure the correct float arm length and float position is set during installation to achieve the desired water level and ensure proper shut-off.