IS 778 : 1984Copper Alloy Gate, Globe and Check Valves for Waterworks Purposes - Specification

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MSS SP-80 · BS EN 12288 · ASME B16.34

CurrentFrequently UsedSpecificationBIMMEP · Plumbing Fixtures and Valves

Link points to Internet Archive / others. Not hosted by InfraLens. Details

IS 778:1984 is the Indian Standard (BIS) for copper alloy gate, globe and check valves for waterworks purposes - specification. IS 778 covers the material, dimensional, and testing specifications for copper alloy (gunmetal/brass) gate, globe, and check valves used in water supply and plumbing networks. Engineers use this code to specify valve classes based on working pressure and to ensure dimensional standardisation for both threaded and flanged connections.

Specifies requirements for copper alloy gate, globe, and check valves for general waterworks purposes.

Overview

Status: Current
Usage level: Frequently Used
Domain: MEP — Plumbing Fixtures and Valves
Type: Specification
Amendments: Amendment 1 (1986); Amendment 2 (1989); Amendment 3 (1995); Amendment 4 (2000)

International equivalents

MSS SP-80-2019 · MSS (US)BS EN 12288:2010 · BSI/CEN (UK/Europe)ASME B16.34-2020 · ASME (US)

Typically used with

IS 318 IS 320 IS 554 IS 6912 IS 1068

Also on InfraLens for IS 778

8Key values 5Tables 4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes

! Always specify whether the required valve ends are screwed or flanged, as the code dictates different face-to-face dimensions for both.

! For aggressive or hard water areas, ensure the spindle material is specified as dezincification-resistant (DZR) brass.

! Do not use these specifications for valves exceeding 100 mm nominal bore; larger sizes typically transition to cast iron valves (IS 780 or IS 14846).

Frequently referenced clauses

Cl. 3Nominal Sizes Cl. 4Materials Cl. 5Manufacture and Workmanship Cl. 8Testing Cl. 10Marking

Updates & Amendments4 amendments

1986Amendment 1 (1986)

1989Amendment 2 (1989)

1995Amendment 3 (1995)

2000Amendment 4 (2000)

Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.

copper alloygunmetalbrassbronze

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) made from copper alloys (bronze) for general service.

BS 5154:1991BSI (UK)

HighWithdrawn

Specification for copper alloy globe, globe stop and check, check and gate valves

Historically, this was the direct British equivalent, covering the same valve types and materials.

BS EN 12288:2010BSI/CEN (UK/Europe)

MediumCurrent

Industrial valves - Copper alloy gate valves

Specifically covers copper alloy gate valves, but unlike IS 778, does not cover globe or check valves in the same document.

ASME B16.34-2020ASME (US)

MediumCurrent

Valves—Flanged, Threaded, and Welding End

A broad valve design standard that includes bronze materials but is not specific to waterworks and covers a much wider range of pressure classes and materials.

Key Differences

≠IS 778 uses a 'Class 1' and 'Class 2' pressure rating system defined by specific hydrostatic test pressures (e.g., Class 1 body test at 2.5 MPa). In contrast, MSS SP-80 uses pressure classes (e.g., 125, 150, 200) based on pressure-temperature ratings in psi, while European standards like BS EN 12288 use PN (Nominal Pressure) ratings.

≠IS 778 specifies material grades by referencing other Indian Standards (e.g., Leaded Tin Bronze as per IS 318). International standards refer to their own national or regional specifications, such as ASTM material grades (e.g., ASTM B62) in MSS SP-80 or EN material numbers (e.g., CC491K) in BS EN 12288.

≠The Indian standard conveniently bundles requirements for gate, globe, and check valves into a single document. Modern European standards are typically segregated by valve type, with separate standards for gate valves (BS EN 12288), check valves, and globe valves.

≠Face-to-face dimensions are specified directly within tables in IS 778. International standards typically refer to separate dimensional standards, such as ASME B16.10 in the US or EN 558 in Europe, which may not have directly corresponding dimensions.

Key Similarities

≈All comparable standards (IS 778, MSS SP-80, BS 5154) are fundamentally focused on valves manufactured from copper alloys, such as bronze and brass, for their primary body material.

≈The basic designs and functions of the covered valve types—gate (wedge or parallel slide), globe (regulating flow), and check (preventing backflow)—are conceptually the same across all standards.

≈Mandatory hydrostatic testing is a universal requirement. All standards specify a shell (body) pressure test to check for structural integrity and a seat leakage test to ensure proper closure, though the exact pressures and durations may vary.

≈All standards mandate that essential information be marked on the valve body, including the manufacturer's identification, nominal size, and pressure rating, to ensure traceability and correct application.

Parameter Comparison

Parameter	IS Value	International	Source
Pressure Rating System	Class 1 and Class 2, based on test pressure.	Pressure Class based on pressure-temperature ratings (e.g., Class 125, 150).	MSS SP-80-2019
Body Hydrostatic Test Pressure (Highest Rating)	2.5 MPa for Class 1	350 psig (~2.41 MPa) for Class 150	MSS SP-80-2019
Seat Hydrostatic Test Pressure (Highest Rating)	1.5 MPa for Class 1	225 psig (~1.55 MPa) for Class 150	MSS SP-80-2019
Primary Body Material Example	Leaded Tin Bronze, Grade LTB 2 of IS 318	Bronze, ASTM B62, UNS No. C83600	MSS SP-80-2019
Stem Material Example	High Tensile Brass, Grade HTB 1 of IS 320	Silicon Bronze, ASTM B98, UNS No. C65100	MSS SP-80-2019
Dimensional Standard Reference (Gate Valve)	Tables specified within IS 778:1984.	EN 558, Basic Series.	BS EN 12288:2010
End Connections	Screwed ends (IS 554), flanged ends (drilled to IS 1538 or IS 6392).	Threaded ends (ASME B1.20.1), flanged ends (ASME B16.1, B16.24).	MSS SP-80-2019

⚠ Verify details from original standards before use

Key Values8

Quick Reference Values

size range8 mm to 100 mm

class 1 working pressure1.0 MPa

class 2 working pressure1.5 MPa

class 1 body test pressure1.5 MPa

class 1 seat test pressure1.0 MPa

class 2 body test pressure2.4 MPa

class 2 seat test pressure1.5 MPa

minimum test duration2 minutes

Tables & Referenced Sections

Key Tables

Table 1 - Material for Parts

Table 2 - Dimensions of Gate Valves

Table 4 - Dimensions of Globe Valves

Table 6 - Dimensions of Check Valves

Table 8 - Test Pressures

Key Clauses

Clause 3 - Nominal Sizes

Clause 4 - Materials

Clause 5 - Manufacture and Workmanship

Clause 8 - Testing

Clause 10 - Marking

Frequently Asked Questions4

What is the difference between Class 1 and Class 2 valves in IS 778?+

Class 1 valves are designed for a safe working pressure of 1.0 MPa, while Class 2 valves are designed for 1.5 MPa.

What are the required hydrostatic test pressures?+

For Class 1, the body is tested at 1.5 MPa and the seat at 1.0 MPa. For Class 2, the body is tested at 2.4 MPa and the seat at 1.5 MPa (Table 8).

What nominal sizes are covered by this standard?+

The standard covers nominal bore sizes ranging from 8 mm up to 100 mm.

What is the primary material used for the valve body?+

Leaded tin bronze (commonly known as gunmetal) conforming to IS 318.

QA/QC Inspection Templates

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QA/QC templates coming soon for this code.

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IS 778 : 1984Copper Alloy Gate, Globe and Check Valves for Waterworks Purposes - Specification

PDF Google Compare BIS Portal

Link points to Internet Archive / others. Not hosted by InfraLens. Details

MSS SP-80 · BS EN 12288 · ASME B16.34

CurrentFrequently UsedSpecificationBIMMEP · Plumbing Fixtures and Valves

PDF Google Compare BIS Portal

Link points to Internet Archive / others. Not hosted by InfraLens. Details

Specifies requirements for copper alloy gate, globe, and check valves for general waterworks purposes.

Overview

Status: Current
Usage level: Frequently Used
Domain: MEP — Plumbing Fixtures and Valves
Type: Specification
Amendments: Amendment 1 (1986); Amendment 2 (1989); Amendment 3 (1995); Amendment 4 (2000)

International equivalents

MSS SP-80-2019 · MSS (US)BS EN 12288:2010 · BSI/CEN (UK/Europe)ASME B16.34-2020 · ASME (US)

Typically used with

IS 318 IS 320 IS 554 IS 6912 IS 1068

Also on InfraLens for IS 778

8Key values 5Tables 4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes

! Always specify whether the required valve ends are screwed or flanged, as the code dictates different face-to-face dimensions for both.

! For aggressive or hard water areas, ensure the spindle material is specified as dezincification-resistant (DZR) brass.

! Do not use these specifications for valves exceeding 100 mm nominal bore; larger sizes typically transition to cast iron valves (IS 780 or IS 14846).

Frequently referenced clauses

Cl. 3Nominal Sizes Cl. 4Materials Cl. 5Manufacture and Workmanship Cl. 8Testing Cl. 10Marking

Updates & Amendments4 amendments

1986Amendment 1 (1986)

1989Amendment 2 (1989)

1995Amendment 3 (1995)

2000Amendment 4 (2000)

Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.

copper alloygunmetalbrassbronze

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) made from copper alloys (bronze) for general service.

BS 5154:1991BSI (UK)

HighWithdrawn

Specification for copper alloy globe, globe stop and check, check and gate valves

Historically, this was the direct British equivalent, covering the same valve types and materials.

BS EN 12288:2010BSI/CEN (UK/Europe)

MediumCurrent

Industrial valves - Copper alloy gate valves

Specifically covers copper alloy gate valves, but unlike IS 778, does not cover globe or check valves in the same document.

ASME B16.34-2020ASME (US)

MediumCurrent

Valves—Flanged, Threaded, and Welding End

A broad valve design standard that includes bronze materials but is not specific to waterworks and covers a much wider range of pressure classes and materials.

Key Differences

Key Similarities

≈All comparable standards (IS 778, MSS SP-80, BS 5154) are fundamentally focused on valves manufactured from copper alloys, such as bronze and brass, for their primary body material.

Parameter Comparison

Parameter	IS Value	International	Source
Pressure Rating System	Class 1 and Class 2, based on test pressure.	Pressure Class based on pressure-temperature ratings (e.g., Class 125, 150).	MSS SP-80-2019
Body Hydrostatic Test Pressure (Highest Rating)	2.5 MPa for Class 1	350 psig (~2.41 MPa) for Class 150	MSS SP-80-2019
Seat Hydrostatic Test Pressure (Highest Rating)	1.5 MPa for Class 1	225 psig (~1.55 MPa) for Class 150	MSS SP-80-2019
Primary Body Material Example	Leaded Tin Bronze, Grade LTB 2 of IS 318	Bronze, ASTM B62, UNS No. C83600	MSS SP-80-2019
Stem Material Example	High Tensile Brass, Grade HTB 1 of IS 320	Silicon Bronze, ASTM B98, UNS No. C65100	MSS SP-80-2019
Dimensional Standard Reference (Gate Valve)	Tables specified within IS 778:1984.	EN 558, Basic Series.	BS EN 12288:2010
End Connections	Screwed ends (IS 554), flanged ends (drilled to IS 1538 or IS 6392).	Threaded ends (ASME B1.20.1), flanged ends (ASME B16.1, B16.24).	MSS SP-80-2019

⚠ Verify details from original standards before use

Key Values8

Quick Reference Values

size range8 mm to 100 mm

class 1 working pressure1.0 MPa

class 2 working pressure1.5 MPa

class 1 body test pressure1.5 MPa

class 1 seat test pressure1.0 MPa

class 2 body test pressure2.4 MPa

class 2 seat test pressure1.5 MPa

minimum test duration2 minutes

Tables & Referenced Sections

Key Tables

Table 1 - Material for Parts

Table 2 - Dimensions of Gate Valves

Table 4 - Dimensions of Globe Valves

Table 6 - Dimensions of Check Valves

Table 8 - Test Pressures

Key Clauses

Clause 3 - Nominal Sizes

Clause 4 - Materials

Clause 5 - Manufacture and Workmanship

Clause 8 - Testing

Clause 10 - Marking

Frequently Asked Questions4

What is the difference between Class 1 and Class 2 valves in IS 778?+

Class 1 valves are designed for a safe working pressure of 1.0 MPa, while Class 2 valves are designed for 1.5 MPa.

What are the required hydrostatic test pressures?+

For Class 1, the body is tested at 1.5 MPa and the seat at 1.0 MPa. For Class 2, the body is tested at 2.4 MPa and the seat at 1.5 MPa (Table 8).

What nominal sizes are covered by this standard?+

The standard covers nominal bore sizes ranging from 8 mm up to 100 mm.

What is the primary material used for the valve body?+

Leaded tin bronze (commonly known as gunmetal) conforming to IS 318.

QA/QC Inspection Templates

📋

QA/QC templates coming soon for this code.

Browse all 300 templates →

IS 778 : 1984Copper Alloy Gate, Globe and Check Valves for Waterworks Purposes - Specification

Overview

International Equivalents

Key Values8

Tables & Referenced Sections

Related Resources on InfraLens

Frequently Asked Questions4

QA/QC Inspection Templates

IS 778 : 1984Copper Alloy Gate, Globe and Check Valves for Waterworks Purposes - Specification

Overview

International Equivalents

Key Values8

Tables & Referenced Sections

Related Resources on InfraLens

Frequently Asked Questions4

QA/QC Inspection Templates