Page 113 - Valve Selection Handbook

100 Valve Selection Handbook

\. Short pattern, having reduced area plug ports and face-to-face
dimensions that are interchangeable with gate valves. This pattern
applies to sizes up to DN 300 (NFS 12) in class 150 only.
2. Regular pattern, having plug ports with areas larger than short or
venturi patterns. The face-to-face dimensions are interchangeable
with gate valves for pressure ratings class 300 and higher. Regular
pattern plug valves for class 150 have face-to-face dimensions to a
long series that are not interchangeable with gate valves.
3. Venturi pattern, having reduced area ports and body throats that are
approximately venturi. The face-to-face dimensions are interchange-
able with gate valves for pressure ratings class 300 and higher. Ven-
turi-pattern plug valves for class 150 have face-to-face dimensions
to a long series that are not interchangeable with gate valves.
4. Round-port full-area pattern, having full-area round ports through
the valve. The face-to-face dimensions are longer than short, regu-
lar, or venturi-pattern plug valves and are noninterchangeable with
gate valves.

Standards Pertaining to Plug Valves

Appendix C provides a list of U.S. and British standards pertaining to
plug valves.
Applications

Duty:
Stopping and starting flow
Moderate throttling
Flow diversion
Fluids:
Gases
Liquids
Non-abrasive slurries
Abrasive slurries for lubricated plug valves
Sticky fluids for eccentric and lift plug valves
Sanitary handling of Pharmaceuticals and food stuffs
Vacuum