What are the nominal sizes covered for float valves in this standard?

The standard covers nominal sizes of 15 mm, 20 mm, 25 mm, 32 mm, 40 mm, and 50 mm.

What materials are acceptable for the float?

Floats can be manufactured from copper, polyethylene (plastic), or other suitable corrosion-resistant materials as specified in the standard.

What pressure must the valve body withstand during testing?

The assembled valve body must withstand a hydraulic test pressure of 1.5 MPa without leaking or sweating.

What is the difference between HP and LP valves?

High Pressure (HP) valves are designed for supply mains up to 1.05 MPa, whereas Low Pressure (LP) valves are meant for systems with a maximum pressure of 0.175 MPa.

IS 1703

: 2000

Water Fittings - Copper Alloy Float Valves (Horizontal Plunger Type)

CurrentSpecializedSpecificationBIMMEP · Sanitary Appliances and Water Fittings

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This standard prescribes the requirements for materials, dimensions, manufacture, workmanship, and testing of horizontal plunger type copper alloy float valves used for water supply in cisterns, overhead tanks, and similar fixtures.

Water Fittings - Copper Alloy Float Valves (Horizontal Plunger Type)

Quick Reference Values

nominal sizes covered15, 20, 25, 32, 40, and 50 mm

hydraulic test pressure body1.5 MPa

working pressure high pressure type1.05 MPa

working pressure low pressure type0.175 MPa

Practical Notes

Properly match the float ball size and lever arm length to the incoming water pressure to ensure complete shut-off and prevent overflow.

Periodically inspect and replace the valve washer, as it is the most frequent point of wear leading to continuous leaks.

Ensure correct selection between High Pressure (HP) and Low Pressure (LP) valve types based on the building's water supply head.