scope:

This specification covers flanged cast-iron, and flanged and welded-end cast-steel and forged-steel valves for pipe-line service as following:

Solid-wedge gate valves:

Raising-stem

Non-rising-stem

Double-disc gate valves:

Rising-stem

Non-rising-stem

Plug valves:

Swing check valves:

NOTE: The valve sketches herein are illustrative of some of the stipulations of this specification, but show also some variations of commercial design, on which the purchaser may exercise a choice. All the choice of materials for certain valve parts in optional with the purchaser. The purchaser, Therefore, should state all his requirements for the time of purchase, with the understanding that if not otherwise specified on the order, The manufacturer may supply any commercial variation meeting the requirements of the specifications, and futher that no one manufacturer is prepared to furnish valves in all valves in all applicable variations.

Nothing contained in this specification is to be constructed as granting any right by implication or otherwise, for manufacture, sale , or use in connection with any method, apparatus, or product covered by letters patent, nor as insuring anyone against liability for infringement of letter patent.