What are the standard pressure ratings (PN) for these air valves?

The standard covers PN 1.0 (1.0 MPa) and PN 1.6 (1.6 MPa) rated valves (Clause 1.1).

What is the required body test pressure?

The valve body must be hydrostatically tested to 1.5 times the nominal pressure (PN) for 10 minutes without any leakage (Clause 8.2.1).

What material is specified for the valve body?

The body, bonnet, and cover shall be made of Grey Cast Iron conforming to Grade FG 200 of IS 210, or Ductile Iron (Table 1).

Which standard should the valve flanges conform to?

The flanges should be integrally cast with the body and their dimensions should conform to IS 1538 (Clause 5.4).

IS 14845

: 2000

Resilient Seated Cast Iron Air Relief Valves for Water Works Purposes

CurrentFrequently UsedSpecificationBIMWater Resources · Sanitary Appliances and Water Fittings

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This standard specifies the requirements for resilient seated cast iron air relief valves of single, double, and kinetic types, ranging from DN 40 to DN 200 for use in waterworks. It covers materials, dimensions, construction, performance tests, and marking for valves rated up to PN 1.6.

Resilient Seated Cast Iron Air Relief Valves for Water Works Purposes

Quick Reference Values

Applicable Valve SizesDN 40 to DN 200

Nominal Pressure RatingsPN 1.0 and PN 1.6

Hydrostatic Body Test Pressure1.5 times PN for 10 minutes

Hydrostatic Seat Test Pressure1.1 times PN for 5 minutes

Body/Bonnet/Cover MaterialGrey Cast Iron (FG 200 of IS 210) or Ductile Iron

Float MaterialStainless Steel (IS 6911) or ABS

Rubber Seal MaterialEPDM/Nitrile Rubber (IS 638)

Practical Notes

Ensure the correct type (small orifice, large orifice, or double) is chosen based on the pipeline's operational needs for air release and vacuum breaking.

Verify the compatibility of the resilient seat material (e.g., EPDM for treated water, NBR for water with oil traces) with the fluid.

During installation, ensure the valve is placed at a summit in the pipeline and is perfectly vertical for proper float operation.