MS28052C
Materials.
a. Spring: phosphor bronze, in accordance with ASTM B159/B159M.
b. Body, seat, and retainer: Brass, in accordance with ASTM B16/B16M. Composition 22 half hard.
Finish.
a. MS28052-1, aluminum or brass.
b. MS28052-2, any black oxidizing finish.
Valve characteristic: See figure 1.
Part or Identifying Number (PIN). The PIN is as follows:
MS28052 - 1
Dash number (see table I) Specification sheet number MS prefix
Referenced documents shall be of the issue in effect on the date of the invitation for bid.
Marking. Letter B or F shall be stamped on three alternate hexagon flats in accordance with MPI ASM, "The Master Painter's Institute - Architectural Painting Specification Manual". Letter B shall be stamped on MS28052-1 and filled with black enamel. Letter F shall be stamped on MS28052-2 and filled with white enamel. In addition, the MS PIN shall be stamped on the flats of the hexagon. All markings shall be not less than .062 inch (1.575 mm) high by .016 inch (.406 mm) deep by .016 (.406 mm) inch line width.
For design feature purposes, this standard takes precedence over procurement documents referenced herein.
Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.
Referenced documents. This document references the following:
MIL-S-7742
ASTM B16/B16M ASTM B159/B159M MPI ASM
SAE AS4395
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