年表作成・共有サービス - pastport

6.1 Valve types

6.1.1 Gate valves
Typical configurations for gate valves with flanged and welding ends are shown, for illustration purposes only, in Figures 1 and 2. Gate valves shall have an obturator that moves in a plane perpendicular to the direction of flow. The gate can be constructed of one piece for slab-gate valves or of two or more pieces for expanding-gate valves. Gate valves shall be provided with a back seat or secondary stem sealing feature in addition to the primary stem seal.
Expanding-gate/rising-stem gate valve
Figure 1 - Expanding-gate/rising-stem gate valve

Siab-gate/through-conduit rising-stem gate valve
Figure 2 - Siab-gate/through-conduit rising-stem gate valve
6.1.2 Lubricated and non-lubricated plug valves
Typical configurations for plug valves with flanged and welding ends are shown, for illustration purposes only, in Figure 3. Plug valves shall have a cylindrical or conical obturator that rotates about an axis perpendicular to the direction of flow.
Plug valve
Figure 3 - Plug valve

6.1.3 Ball valves
Typical configurations for ball valves with flanged or welding ends are shown, for illustration purposes only, in Figures 4, 5 and 6. Ball valves shall have a spherical obturator that rotates on an axis perpendicular to the direction of flow.
Top-entry ball valve
Figure 4 - Top-entry ball valve

Three-piece ball valve
Figure 5 - Three-piece ball valve

Welded-body ball valve
Figure 6 - Welded-body ball valve
6.1.4 Check valves
Typical configurations for check valves are shown, for illustration purposes only, in Figures 7 to 13. Check valves can also be of the wafer, axial flow and lift type. Check valves shall have an obturator which responds automatically to block fluid in one direction.
Reduced-opening swing check valve
Figure 7 - Reduced-opening swing check valve

Full-opening swing check valve
Figure 8 - Full-opening swing check valve

Single-plate wafer-type check valve, long pattern
Figure 9 - Single-plate wafer-type check valve, long pattern

Typical dual-plate wafer-type check valve, long pattern
Figure 10 - Typical dual-plate wafer-type check valve, long pattern

Single-plate wafer-type check valve, short pattern
Figure 11 - Single-plate wafer-type check valve, short pattern

Axial flow check valve
Figure 12 - Axial flow check valve

Piston check valve
Figure 13 - Piston check valve
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