MIL-DTL-16356E
3.12.9.2.1 Bonnet design. Valves shall be of flanged bonnet construction or bonnetless design. Flanged bonnet
construction shall incorporate the following features:
a. Bonnet alignment shall be obtained by body guiding, that is, a close tolerance fit between the bonnet and
valve body. The bonnet shall not be aligned by means of the bonnet studs.
b. Flanged face shall assure proper compression of the flanged gasket when the body and bonnet flanges are
drawn up metal-to-metal.
3.12.9.2.2 Stem and disc design. Outside screw and yoke construction shall be used. The disc shall be attached
to the stem with a swivel. The stem shall have specific hardness depending on material (see 4.7.5). Valves shall
have a positive backseat. See 4.7.1.3 for backseat leakage test.
3.12.9.2.3 Stuffing box design. Stuffing boxes shall be of ample depth for at least six turns of packing.
Stuffing box glands shall be secured and adjusted by a bolting arrangement which by adjustment shall ensure
tightness of the stuffing box under all operating conditions. The bearing surface between the gland follower and
gland flange shall be spherically finished.
3.12.9.2.4 Seat and disc design. Seats shall be integral with the body or shall consist of a tubular insert, or seat,
welded or brazed into the body. Class I and II valves may use seats screwed into the body. Requirements and
alternate materials shall be in accordance with valve material requirements for discs of 803-2177525 apply. Disc
and seat shall be hardfaced with Stellite® no. 6, or equal, (in accordance with MIL-R-17131, Type MIL-RCoCr-A-
1, -2, and -3), Haynes® alloy no. 25, or equal. Finished thickness of facing shall be not less than 3/32 inch. Solid
Stellite®, or equal, disc fabrication is allowed.
3.12.9.3 Drain valves. Two Navy standard valves shall be provided for attachment to the bottom shut-off valve
as drain valves, allowing the gauge glass to be drained with the shut-off valves open or closed. The valve closest to
the gauge shall be a throttling valve type; since it is adjusted to reduce blowdown. The valve connecting to the
piping shall be of the stop valve type since it is used to accomplish periodic blowdown. At least one connection on
valve attaching to the gauge shall be flanged; interconnection of the two valves need not be flanged.
3.12.9.4 Mounting flanges. Flanges of top and bottom shut-off valves shall be ¾ inch size. Unless otherwise
specified (see 6.2), flange pressure rating shall be 600 psig for Type A, Class I and II gauges and 1500 psig for
Type A, Class IV. Drain valve flanges shall also be ¾ inch size.
3.12.10 Materials. Minimum material requirements for Type A shall be as follows:
a. Frame bodies and connector fittings of forged steel, cast steel, steel plate, or pipe shall be of a quality to
meet the performance requirements of this specification. Cover-plates shall be forged steel. Preferred material for
Class IV gauges is corrosion-resisting steel or carbon steel body with gasket seating surface inlaid with corrosion-
resisting steel. Gasket-contact surfaces of carbon-steel bodies, if used, shall be inlayed by a method that results in
crack-free bodies.
b. Bolts, studs, and nuts for frame covers shall be steel in accordance with MIL-DTL-1222 or
ASTM A193/A193M and ASTM A194/A194M; cap screws shall be in accordance with FF-S-86.
c. Ball-check bodies shall be corrosion-resisting steel in accordance with ASTM A217/A217M or
ASTM A276; Haynes Stellite® no. 3; or equal.
d.
Tubular connecting pieces shall be material equal to or better than that used in frame body.
e.
Valve sprocket wheels shall be ductile iron, forged steel, or cast steel.
f. Valve discs shall be MIL-S-24093, Type V, Class H; SAE-AMS-QQ-S-763, Type 410; Carbon steel
ASTM A105/A105M with hardfacing; or solid Stellite® No. 6 or equal.
g. Valve stems shall be ASTM A182/A182M GR F6A modified or SAE-AMS-QQ-S-763, Class 410,
Condition T.
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