scope:

This standard covers steel plug valves with flanged or buttwelding ends NPS 1 through NPS 24 corresponding to nominal pipe sizes in ANSI BJ6.10.

This standard covers valves in Classes 150 to 2500 in ANSI B16.34.

The valves described in this standard are the lubricated or nonlubricated type having two-way coaxial ports. This standard includes valves fitted with internal body or port liners or applied hard facings on either bodies, body ports, plugs, or plug ports. The material and extent of liners are not covered. These special needs must be stated in the purchase order when desired.

Three-way and four-way plug valves are not included in this standard.

Plug valves covered by this sumdard are classified under four general design groups as follows:

1.Short pattern: The short pattern design has the same face-to-face dimensions as Classes 150 and 300 flanged steel gate valves corresponding to those in ANSI B16.10.

2.Regular pattern: The body of the regular pattern design, although designed as nearly as possible for streamline flow, does not approach the shape of a venturi throat because the plug ports are larger than those in the venturi pattern. In the regular pattern design, the plug port area is substantially greater than that for the venturi valve.

3.Venturi pattern: Valves of the venturi pattern are designed for minimum pressure loss consistent with the reduced port area used in this type of valve and have a conjunction of body and plug ports approximating a venturi throat.

4.The round-port full-bore pattern: The round-port- full-bore pattern has a circular port through both plug and body equal to at least the inside diameter of the comparable ANSI B16.5 fitting.

The standard nomenclature for valve parts is shown in Figure 1. Although the figure indicates a lubricated design, nonlubricated valves may be similar except for the omission of the lubrication groove and the substitution of mechanical means for freeing the plug.