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IS 5312:2000 (Part 1) is the Indian Standard (BIS) for swing check type reflux (non-return] valves for water works purposes, part 1: single-door pattern. This Indian Standard specifies the requirements for multi-door swing check type reflux (non-return) valves from 450 mm to 2000 mm size for water works purposes. It covers materials, principal dimensions, pressure ratings (PN 1.0 and PN 1.6), manufacturing, testing procedures, and marking.
Swing Check Type Reflux (Non-Return] Valves for Water Works Purposes, Part 1: Single-Door Pattern
Overview
Status
Current
Usage level
Specialized
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
! Multi-door designs are used in large diameter pipelines to minimize water hammer (slam) and reduce the head-room needed for the doors to open compared to a single-door valve.
! Ensure flange drilling patterns match the connecting pipeline flanges, which typically conform to IS 1538.
! The arrow marked on the valve body is critical; it must be installed pointing in the direction of the water flow.
Swing-Check Valves for Waterworks Service, 3-in. (75-mm) through 48-in. (1,200-mm) NPS
Specifies iron-body, bronze-mounted single-disc swing-check valves specifically for municipal waterworks.
BS EN 12334:2001CEN (European Committee for Standardization), Europe / BSI, UK
HighCurrent
Industrial valves - Cast iron check valves
Covers cast iron swing and lift check valves for general industrial use, including water applications.
API 594American Petroleum Institute, USA
MediumCurrent
Check Valves: Flanged, Lug, Wafer and Butt-welding
Covers design and materials for check valves, but primarily for petroleum and natural gas industries.
BS 5153:1991British Standards Institution (BSI), UK
HighWithdrawn
Specification for cast iron check valves for general purposes
This was the primary British standard for cast iron check valves before harmonization with European standards.
Key Differences
≠IS 5312 specifies pressure ratings in PN (Nominal Pressure) based on MPa (PN 0.6, PN 1.0, PN 1.6), whereas AWWA C508 uses pressure classes based on psig working pressure (e.g., Class 150B for 200 psig).
≠Coating requirements in AWWA C508 are highly specific, often mandating fusion-bonded epoxy compliant with AWWA C550 for potable water. IS 5312 provides more general options, including black bituminous paint as a default.
≠Material specifications reference different national standards. IS 5312 refers to IS 210 for cast iron, while BS EN 12334 uses EN 1561, and AWWA C508 uses ASTM A126.
≠IS 5312 specifies a seat hydrostatic test pressure equal to the PN rating (e.g., 1.0 MPa for PN 1.0), while BS EN 12334 requires 1.1 times the PN rating (e.g., 11 bar for PN 10).
Key Similarities
≈All standards specify the fundamental design of a single-disc swing check valve for preventing backflow in water pipelines.
≈Grey Cast Iron is a primary and standard body material across IS 5312, AWWA C508, and BS EN 12334, with ductile iron as a common alternative.
≈Mandatory hydrostatic pressure testing for both the valve body (shell test) and the seat sealing (seat test) is a common requirement in all standards.
≈Flanged end connections are a standard configuration, with dimensions specified by referencing regional flange standards (e.g., IS 1538, ASME B16.1, EN 1092-2).
Parameter Comparison
Parameter
IS Value
International
Source
Primary Body Material (Grey Cast Iron)
Grade FG 260 as per IS 210
Class B as per ASTM A126
AWWA C508-17
Body Hydrostatic Test Pressure
1.5 x PN (e.g., 1.5 MPa for PN 1.0)
1.5 x PN (e.g., 15 bar for PN 10)
BS EN 12334:2001
Seat Hydrostatic Test Pressure
1.0 x PN (e.g., 1.0 MPa for PN 1.0)
1.1 x PN (e.g., 11 bar for PN 10)
BS EN 12334:2001
Flange Drilling Standard Reference
IS 1538
ASME B16.1 (for Class 125)
AWWA C508-17
Face-to-Face Dimensions (DN 200 Example)
260 mm (for PN 1.0)
292 mm (Basic series 48 of EN 558)
BS EN 12334:2001
Standard Seat Ring Material
Leaded Tin Bronze, Grade LTB 2 of IS 318
Bronze, UNS C83600 or higher
AWWA C508-17
Pressure Rating Designations
PN 0.6, PN 1.0, PN 1.6 (MPa)
PN 10, PN 16, PN 25 (Bar)
BS EN 12334:2001
⚠ Verify details from original standards before use
Key Values7
Quick Reference Values
Applicable Valve Sizes450 mm to 2000 mm nominal size
Standard Pressure Rating (PN 1.0)1.0 MPa
Standard Pressure Rating (PN 1.6)1.6 MPa
Body Test Pressure (Hydrostatic)1.5 times the nominal pressure (PN)
Seat Test Pressure (Hydrostatic)Equal to the nominal pressure (PN)
Body Material SpecificationGrey Cast Iron, Grade FG 200 or FG 260 of IS 210
Seat Ring Material SpecificationLeaded Tin Bronze, Grade LTB2 of IS 318
Tables & Referenced Sections
Key Tables
Table 1 - Materials for Principal Parts
Table 2 - Principal Dimensions of Multi-Door Reflux Valves
What are the standard pressure ratings covered by this code?+
The standard covers two nominal pressure ratings: PN 1.0 (1.0 MPa) and PN 1.6 (1.6 MPa) as per Clause 3.
What is the required body test pressure for a PN 1.0 valve?+
The hydrostatic body test pressure is 1.5 MPa (1.5 times PN), held for 5 minutes without leakage (Table 3).
What material is specified for the valve body?+
Grey cast iron conforming to Grade FG 200 or FG 260 of IS 210 is specified for the body (Table 1).
Why use a multi-door valve instead of a single-door one?+
For large pipe diameters, a multi-door valve has a smaller slam velocity, which reduces water hammer. It also requires less vertical clearance to open fully.