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IS 780:2016 is the Indian Standard (BIS) for sluice valves for waterworks (cast iron or ductile iron body) - specification. This standard covers the specifications for inside screw, non-rising stem type sluice valves with cast iron or ductile iron bodies used in waterworks. Engineers use this code to define the dimensions, materials, pressure ratings, and hydrostatic testing requirements for valves in municipal and industrial water supply networks.
Specifies requirements for sluice valves of various sizes suitable for waterworks applications.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Ensure the selected PN rating (PN 1.0 or PN 1.6) exceeds both the maximum working pressure and potential surge pressures in the pipeline.
! Non-rising stem valves are standard for underground installations as they save space and protect the stem from damage.
! Always verify flange dimensions and drilling against connecting pipe flanges, which typically conform to IS 1538 for cast iron fittings.
! Standard closing direction is clockwise, but anti-clockwise closure can be specified if required by the purchaser. This must be clearly marked on the handwheel or cap.
Valves for water supply - Fitness for purpose requirements and appropriate verification tests - Part 2: Isolating valves
Specifies general performance requirements for isolating valves (including gate valves) for water supply systems.
AWWA C509-22American Water Works Association (US)
HighCurrent
Resilient-Seated Gate Valves for Water Supply Service
Covers iron-body, resilient-seated gate valves, a primary type specified within IS 780.
BS 5163-1:2004BSI (UK)
HighCurrent
Valves for waterworks purposes. Ductile iron gate valves. Specification
A direct British equivalent for ductile iron gate valves, historically a basis for older IS 780 revisions.
AWWA C500-19American Water Works Association (US)
MediumCurrent
Metal-Seated Gate Valves for Water Supply Service
Covers metal-seated gate valves, which is one of the two types (along with resilient-seated) covered by IS 780.
Key Differences
≠IS 780 covers both metal-seated and resilient-seated valves in one standard, whereas AWWA splits them into two separate standards: AWWA C500 (metal-seated) and AWWA C509 (resilient-seated).
≠Flange drilling patterns and dimensions differ. IS 780 specifies flanges as per IS 1538 (based on ISO/DIN standards), which are generally not interchangeable with AWWA-specified flanges (based on ASME B16.1).
≠Pressure testing requirements vary. For example, the shell test in IS 780 is 1.5 times the nominal pressure (PN), while in AWWA C509 it is 2.0 times the rated working pressure.
≠Face-to-face dimensions are not always identical. IS 780 primarily follows IS 14846 (ISO 5752 Series 14), while European standards like BS 5163 may use EN 558 Series 15, which has a longer dimension for the same nominal size and pressure.
Key Similarities
≈All standards cover wedge-type gate valves primarily intended for isolation (on/off) service in potable water distribution networks.
≈The fundamental design of a Non-Rising Stem (NRS) is a common feature for valves intended for buried service across all listed standards.
≈Mandatory performance testing includes hydrostatic shell (body) tests and seat (closure) leakage tests, ensuring structural integrity and sealing capability.
≈For resilient-seated valves, all standards require the use of high-quality elastomers (like EPDM) suitable for contact with potable water, with defined physical properties.
≈All standards require clear external marking of the valve body to indicate manufacturer, nominal size (DN), nominal pressure (PN) or pressure class, and material.
Parameter Comparison
Parameter
IS Value
International
Source
Shell Hydrostatic Test Pressure (for PN 1.6 / ~16 bar valve)
2.4 MPa (1.5 x PN 1.6)
3.45 MPa (500 psi) for a 250 psi rated valve
AWWA C509-22
Seat Hydrostatic Test Pressure (for PN 1.6 / ~16 bar valve)
1.76 MPa (1.1 x PN 1.6)
1.72 MPa (250 psi) for a 250 psi rated valve
AWWA C509-22
Face-to-Face Dimension (DN 300, PN16)
300 mm (as per IS 14846 / ISO 5752 Series 14)
457 mm (as per EN 558 Series 15)
BS 5163:2004
Flange Drilling (DN 200, PN16)
12 holes, 22 mm dia. on a 295 mm PCD
12 holes, 26 mm dia. on a 295 mm PCD
BS EN 1092-2 (PN16)
Epoxy Coating Minimum Thickness (DFT)
250 microns
250 microns (as per EN 14901, referenced by BS EN 1074)
BS EN 1074-2:2000
Maximum Operating Torque (DN 200)
240 N·m (1.2 x DN)
271 N·m (200 lb·ft) - fixed max for non-geared valves
AWWA C509-22
Body/Bonnet Material
Grey Cast Iron (FG 200/220/260) or Ductile Iron (e.g., SG 400/15)
Ductile Iron (e.g., ASTM A536, Grade 65-45-12)
AWWA C509-22
⚠ Verify details from original standards before use