BS 7438:1991
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Specification for steel and copper alloy wafer check valves, single-disk, spring-loaded type
Hardcopy , PDF
22-05-2020
English
31-05-1991
Important note : Users cannot be edited or removed once added to your Multi user PDF.
Committees responsible
Foreword
Specification
Section 1. General
1 Scope
2 Definitions
3 Type
4 Nominal sizes
5 Nominal and Class pressure designations
6 Pressure/temperature ratings
7 Dimensions and tolerances
Section 2. Design and operation
8 Design
9 Operation
Section 3. Materials
10 Optional requirements
11 Body material
12 Disk, spring, spring retainer materials
13 Identification plates
Section 4. Testing
14 Production pressure testing
15 Test certificate
Section 5. Marking and packaging
16 Body markings
17 Packaging
Appendix
A Information to be supplied by the purchaser
Tables
1 Dimensions and tolerances of wafer check valves for
use with PN flanges (type A)
2 Dimensions and tolerances of wafer check valves for
use with Class designated flanges (type B)
Figures
1 Typical wafer check valve for use with PN flanges
2 Typical wafer check valve for use with Class
designated flanges
Specifies requirements for pressure/temperature ratings, dimensions, design, materials, testing and marking for nominal sizes DN 15 to DN 100.
| Committee |
PSE/18/2
|
| DevelopmentNote |
Supersedes 90/75853 DC (10/2005) Reviewed and confirmed by BSI, October 2012. (09/2012)
|
| DocumentType |
Standard
|
| Pages |
14
|
| PublisherName |
British Standards Institution
|
| Status |
Withdrawn
|
| BS 1560-3.3:1989 | Circular flanges for pipes, valves and fittings (Class designated). Steel, cast iron and copper alloy flanges Specification for copper alloy and composite flanges |
| BS 4504-3.1:1989 | Circular flanges for pipes, valves and fittings (PN designated). Steel, cast iron and copper alloy flanges Specification for steel flanges |
| BS 1560-3.1:1989 | Circular flanges for pipes, valves and fittings (Class designated). Steel, cast iron and copper alloy flanges Specification for steel flanges |
| ISO 6708:1995 | Pipework components Definition and selection of DN (nominal size) |
| BS 1503:1989 | Specification for steel forgings for pressure purposes |
| BS 4504-3.3:1989 | Circular flanges for pipes, valves and fittings (PN designated) Specification for copper alloy and composite flanges |
| BS 6755-1:1986 | Testing of valves Specification for production pressure testing requirements |
| DIN 3202-3:1979-10 | FACE-TO-FACE DIMENSIONS OF WAFER TYPE VALVES |
| BS 1504:1976 | Specification for steel castings for pressure purposes |
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