What materials are acceptable for manufacturing the body of plug cocks?

The body and plug are typically manufactured from leaded tin bronze (gunmetal) or brass as per the material specifications in Table 1.

What is the standard testing procedure for these cocks?

Every plug cock must be subjected to a hydraulic test pressure of 1.5 MPa without showing any signs of leakage or sweating.

Can plug cocks be used for throttling water flow?

While they can restrict flow, they are primarily designed for fully open or fully closed isolation purposes.

IS 3004

: 1979

plug cocks for water supply purposes

CurrentRareSpecificationBIMMEP · Sanitary Appliances and Water Fittings

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This standard specifies the requirements for materials, dimensions, manufacture, workmanship, and testing of plug cocks used for water supply purposes.

plug cocks for water supply purposes

Quick Reference Values

Hydraulic test pressure1.5 MPa (15 kgf/cm²)

Standard nominal sizes15, 20, 25, 32, 40, and 50 mm

Operating temperature limitUsually up to 65°C for standard water supply

Minimum thread length (15mm size)11 mm

Practical Notes

Plug cocks are largely obsolete in modern internal plumbing, having been replaced by quarter-turn ball valves.

When using or replacing existing plug cocks, ensure the mating surfaces of the plug and body are accurately lapped to prevent leakage.

Threads should conform to IS 554 for proper sealing with standard pipe fittings.