Link points to Internet Archive / others. Not hosted by InfraLens. Details
IS 4928:1986 is the Indian Standard (BIS) for delivery valve for centrifugal fire pump outlets. This standard specifies the requirements for materials, dimensions, construction, and performance of screw-down type delivery valves for centrifugal fire pump outlets. It covers oblique and right-angle pattern valves of 63 mm, 75 mm, and 100 mm nominal sizes.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
bronzegunmetalstainless steelcopper alloyrubber
International Equivalents
Similar International Standards
UL 262:2020Underwriters Laboratories, USA
HighCurrent
Standard for Gate Valves for Fire-Protection Service
Covers the construction and performance of gate valves specifically intended for fire protection service.
FM 1120:2022FM Global, USA
HighCurrent
Approval Standard for Gate Valves
Specifies test requirements for approval of gate valves used in fire protection systems.
NFPA 20:2022National Fire Protection Association, USA
MediumCurrent
Standard for the Installation of Stationary Pumps for Fire Protection
A system-level standard that mandates requirements for components like discharge valves, but doesn't detail valve construction.
BS 5154:1991British Standards Institution, UK
MediumWithdrawn
Specification for copper alloy gate valves
Covered copper alloy (including gunmetal/bronze) gate valves, though not exclusively for fire service.
Key Differences
≠IS 4928 specifically mandates Gunmetal (LTB2) for the valve body, whereas standards like UL 262 and FM 1120 are more performance-based, allowing materials like Ductile Iron, Cast Iron, and Stainless Steel if they pass performance tests.
≠IS 4928 details a non-rising stem, non-indicating valve design. In contrast, NFPA 20 often requires discharge valves to be of an 'indicating' type (like OS&Y - Outside Screw & Yoke) to provide a clear visual of the open/closed status.
≠International standards like NFPA 20 strongly emphasize third-party 'listing' (e.g., by UL or FM) for components, which involves rigorous testing and factory surveillance. IS 4928 compliance is demonstrated by meeting the standard's specifications, often certified via the national ISI mark.
≠IS 4928 specifies a limited range of nominal sizes (63, 80, 100 mm). International standards cover a much broader range of sizes, typically from 2.5 inches (65 mm) up to 16 inches (400 mm) or more.
Key Similarities
≈All standards serve the same fundamental purpose: to specify a reliable isolating valve for the outlet of a fire pump.
≈Mandatory hydrostatic pressure testing of the valve body (shell test) is a core requirement in both IS 4928 and its international counterparts to ensure structural integrity and prevent leaks.
≈All standards require a seat tightness test to verify the valve's ability to provide a leak-free shutoff when in the closed position.
≈The basic constructional elements specified are analogous, including requirements for the body, bonnet, spindle/stem, gate/wedge, and sealing mechanisms.
Parameter Comparison
Parameter
IS Value
International
Source
Primary Body Material
Gunmetal (Grade LTB2 of IS 318)
Ductile Iron (ASTM A536), Bronze (ASTM B62), Cast Iron (ASTM A126)
UL 262
Hydrostatic Body Test Pressure
2.1 MPa for Class 1
2 x rated pressure (e.g., 350 psi / 2.4 MPa for a 175 psi valve)
UL 262
Hydrostatic Seat Test Pressure
1.4 MPa for Class 1
Rated pressure (e.g., 175 psi / 1.2 MPa)
UL 262
Stem (Spindle) Type
Non-rising stem
Permits both non-rising and rising stems (OS&Y), often requires indicating type
NFPA 20 / UL 262
Indication of Position
Not required (non-indicating valve)
Required for pump discharge (e.g., OS&Y visual stem or post indicator)
NFPA 20
End Connections
Flanged ends as per IS 1538
Flanged (ASME B16.1), Grooved (AWWA C606), or Threaded (ASME B1.20.1)
FM 1120
Nominal Sizes Covered
63, 80, 100 mm
Generally 2.5 in (65 mm) to 12 in (300 mm), can be larger
UL 262
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Nominal Valve Sizes63 mm, 75 mm, 100 mm
Hydraulic Test Pressure (Body)2.1 MN/m² (21.4 kgf/cm²)
Hydraulic Test Duration5 minutes
Seat Leakage Test Pressure1.4 MN/m² (14.3 kgf/cm²)
Seat Leakage Test Duration2 minutes
Tables & Referenced Sections
Key Tables
Table 1 - Material for Component Parts of Delivery Valve