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IS 14845:2000 is the Indian Standard (BIS) for resilient seated cast iron air relief valves for water works purposes. 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
Overview
Status
Current
Usage level
Frequently Used
Domain
Water Resources — Sanitary Appliances and Water Fittings
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
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.
AWWA C512-21American Water Works Association (AWWA), USA
HighCurrent
Air-Release, Air/Vacuum, and Combination Air Valves for Waterworks Service
Covers design, materials, and testing for all types of air valves used in potable water supply.
EN 1074-4:2000European Committee for Standardization (CEN), Europe
HighCurrent
Valves for water supply — Fitness for purpose requirements and appropriate verification tests — Part 4: Air valves
Specifies performance and testing requirements for air valves in water supply systems up to 70°C.
BS EN 1074-4:2000British Standards Institution (BSI), UK
HighCurrent
Valves for water supply. Fitness for purpose requirements and appropriate verification tests. Air valves
The UK's national adoption of the European standard EN 1074-4, making it functionally identical.
Key Differences
≠The hydrostatic body/shell test pressure in IS 14845 is 1.5 times the nominal pressure (PN), whereas AWWA C512 requires a more stringent test at 2.0 times the rated working pressure.
≠AWWA C512 provides a more detailed classification system, explicitly defining Air-Release, Air/Vacuum, and Combination Air Valves, while IS 14845 categorizes them more broadly as single orifice (small) and double orifice (kinetic) valves.
≠Coating requirements differ in specificity. AWWA C512 mandates fusion-bonded epoxy (FBE) with specific thickness and testing, while IS 14845 is less prescriptive, generally specifying epoxy coating without mandating the type (e.g., FBE) or detailed application procedure in the standard itself.
≠EN 1074-4 places a strong emphasis on the performance-based requirement of resistance to disinfection products (like chlorine), which is not explicitly detailed as a type test in IS 14845.
Key Similarities
≈All standards specify the use of cast iron or ductile iron as the primary body and bonnet material, reflecting the common practice in waterworks applications.
≈The fundamental design purpose is identical: to automatically release accumulated air from pressurized pipelines and to admit air during draining to prevent vacuum.
≈Stainless steel is the universally specified material for critical internal components like floats, linkages, and pivots due to its corrosion resistance.
≈All standards require a hydrostatic seat tightness test at a pressure of 1.1 times the nominal or allowable operating pressure (PN or PFA).
Parameter Comparison
Parameter
IS Value
International
Source
Body Hydrostatic Test Pressure
1.5 x PN (e.g., 2.4 MPa for PN 1.6)
2.0 x Rated Pressure (e.g., 300 psi / ~2.07 MPa for 150 psi class)
AWWA C512-21
Seat Tightness Test Pressure
1.1 x PN (e.g., 1.76 MPa for PN 1.6)
1.1 x PFA (e.g., 1.76 MPa for PFA 16)
EN 1074-4:2000
Nominal Size (DN) Range
15 to 200 mm
1/2 in. to 20 in. (~15 to 500 mm)
AWWA C512-21
Primary Body Material
Cast Iron (as per IS 210 Gr. FG 200/220/260)
Cast Iron (ASTM A126, Class B) or Ductile Iron (ASTM A536)
AWWA C512-21
Float Material
Stainless Steel (as per IS 6911)
Stainless Steel (e.g., ASTM A240 Type 304 or 316)
AWWA C512-21
Flange Drilling Standard
IS 1538
EN 1092-2 (for PN designated flanges)
EN 1074-4:2000
Coating Specification
Internally and externally painted with epoxy paint
Fusion-bonded epoxy (FBE) coating, interior and exterior, min. 8 mils (200 μm)
AWWA C512-21
⚠ Verify details from original standards before use
Key Values7
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)
Tables & Referenced Sections
Key Tables
Table 1 - List of Components and Material of Construction
Table 2 - Dimensions of Single Air Valve, Large Orifice