Link points to Internet Archive / others. Not hosted by InfraLens. Details
IS 779:1994 is the Indian Standard (BIS) for copper alloy gate, globe and check valves for waterworks purposes - specification. IS 779 provides specifications for domestic water meters of nominal sizes 15 mm to 50 mm. It covers the material requirements, dimensions, flow performance characteristics, and testing procedures to ensure accurate volumetric measurement of cold potable water.
Specifies requirements for copper alloy gate, globe, and check valves used in waterworks and general piping applications.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
brassbronzecast ironplasticscopper alloy
International Equivalents
Similar International Standards
MSS SP-80-2019MSS (US)
HighCurrent
Bronze Gate, Globe, Angle, and Check Valves
Covers the same valve types (gate, globe, check) in bronze for general services.
BS 5154:1991BSI (UK)
HighWithdrawn
Specification for copper alloy globe, globe stop and check, check and gate valves
Almost identical scope; likely a direct reference or basis for the IS code.
BS EN 12288:2010BSI/CEN (UK/Europe)
MediumCurrent
Industrial valves - Copper alloy gate valves
Covers copper alloy gate valves, but not globe or check valves.
JIS B2011:2016JSA (Japan)
HighCurrent
Bronze Gate, Globe, Angle, and Check Valves
Specifies requirements for bronze gate, globe, angle, and check valves.
Key Differences
≠IS 779 specifies pressure ratings as Class 1 (1.0 MPa) and Class 2 (1.6 MPa), which are PN ratings. Modern international standards like MSS SP-80 use pressure classes (e.g., Class 125, 150, 300) with detailed pressure-temperature rating tables, offering more granular engineering data.
≠Material specifications in IS 779 refer to Indian Standards (e.g., Bronze LTB 2 to IS 318). Equivalent standards use their national or regional material codes, such as ASTM B62 (in MSS SP-80) or EN 1982 grades (in BS EN 12288).
≠IS 779:1994 permits older packing materials like greased jute and hemp. Modern standards effectively mandate the use of asbestos-free materials like PTFE or graphite and have more stringent requirements for stem sealing performance.
≠IS 779 specifies a hydrostatic seat test pressure equal to the nominal pressure (1.0 x PN). Many modern standards, such as BS EN 12288, require a seat test pressure of 1.1 times the nominal pressure (1.1 x PN).
Key Similarities
≈All standards cover the same fundamental valve designs: rising/non-rising stem gate valves, globe valves for throttling, and swing/lift check valves for preventing backflow.
≈The primary material of construction across all standards is a copper-based alloy (bronze or gunmetal) chosen for its corrosion resistance in water applications.
≈A mandatory requirement in both IS 779 and its international counterparts is the hydrostatic testing of the valve body (shell test) and sealing mechanism (seat test) to ensure pressure integrity and proper closure.
≈All standards require essential information to be marked on the valve body, typically including the manufacturer's mark, nominal size, and pressure rating, ensuring traceability and correct installation.
Parameter Comparison
Parameter
IS Value
International
Source
Primary Body Material
Leaded Tin Bronze Grade LTB 2 (per IS 318)
Bronze, ASTM B62
MSS SP-80-2019
Pressure Rating System
Class 1 (1.0 MPa) & Class 2 (1.6 MPa)
Pressure Classes (e.g., Class 125, 150, 200, 300)
MSS SP-80-2019
Shell Hydrostatic Test Pressure (Class 2)
2.4 MPa (1.5 x 1.6 MPa)
24 bar / 2.4 MPa (1.5 x PN16)
BS EN 12288:2010
Seat Hydrostatic Test Pressure (Class 2)
1.6 MPa (1.0 x PN)
17.6 bar / 1.76 MPa (1.1 x PN16)
BS EN 12288:2010
Stem Material (Typical)
High Tensile Brass (IS 319 or IS 320)
Manganese Bronze (ASTM B138) or Silicon Bronze (ASTM B98)
MSS SP-80-2019
Flange Drilling Standard
IS 6392 (Tables for PN1.0 and PN1.6)
EN 1092-3 (for PN10, PN16, etc.)
BS EN 12288:2010
Screwed End Thread Standard
IS 554 (Pipe threads, parallel)
ASME B1.20.1 (NPT)
MSS SP-80-2019
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Nominal sizes covered15 mm to 50 mm
Maximum working pressure1.0 MPa (10 bar)
Maximum water temperature45°C
Accuracy limit (Lower zone - Qmin to Qt)± 5%
Accuracy limit (Upper zone - Qt to Qmax)± 2%
Pressure tightness test limit1.6 MPa for 15 minutes