BS 1868(1975) : 1975

Co-operating organizations
Foreword
Section 1 - General
1 Scope
2 References
3 Definitions
4 Pressure classification
5 Pressure/temperature ratings
6 Nominal sizes
7 Information to be supplied by the purchaser
Section 2 - Design
8 Body
9 Cover
10 Disk, piston or ball
11 Piston and ball guides
12 Hinge and hinge pin (swing type) and spindle
   support cage (disk type)
13 Special fitments
14 Cover bolting
15 Soft seal ring
Section 3 - Materials
16 Shell
17 Body seat ring
18 Body/cover gasket and pipe plug gasket
19 Disk, piston or ball
20 Trim
21 Hinge (swing type) and spindle support
   cage (disk type)
22 Plug
23 Cover bolting
24 Nameplate
25 Soft seal ring
26 Special fitments
27 Special applications
Section 4 - Marking
28 Required markings
29 Body and nameplate markings
30 Cover marking
31 Body marking
32 Direction of flow
33 Nameplate marking
34 Additional markings
35 Omission of markings
Section 5 - Testing
36 Production pressure testing
Section 6 - Shipping
37 Preliminary
38 Preparation for despatch
39 Packaging
Appendix A - Application to piping systems with
             BS 4504-1 flanges
Publications referred to

Describes the requirements for cast or forged steel check valves with flanged or butt-welding ends of the following types: a) swing, for vertical or horizontal flow; and b) lift: i) piston type, for angle or horizontal flow; ii) ball type, for angle or horizontal flow; iii) ball type, for vertical flow; iv) disk type, for vertical flow. The terms "vertical", "horizontal" and "angle" relate to the axes of the body ends.