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|  MIL-V-24642(SH)
3.4.6 Space envelope. The valve shall not exceed the following dimen-
sions: Applicable length (see 3.4.11.2), 17 inches width, and 44 inches in
height.
3.4.7 Maintenance envelope. The valve maintenance envelope shall not
exceed the following dimensions: 24 inches length by 17 inches width by 58.5
inches height.
3.4.8 Gland exhaust connection. The gland exhaust connections shall be
1/2-inch diameter flanges in accordance with ANSI B16.5.
3.4.9 Welding and fabrication.
3.4.9.1 Welding. Unless otherwise specified (see 6.2.1), welding shall
be in accordance with MIL-STD-278.
Fabricated assemblies shall be stress relieved
3.4.9.2 Fabrication.
as units prior to finish machining. The stress relieving shall be in accor-
dance with MIL-STD-278.
3.4.10 Valve handwheels.
3.4.10.1 Operation. Valve shall be closed manually by clockwise
In addition, the hand-
rotation of the handwheel when facing the handwheel.
wheel shall not move when the valve is tripped closed.
3.4.10.2 Design. Handwheels 10 inches and smaller in diameter shall
be of commercial design. Handwheels larger than 10 inches in diameter shall
be in accordance with Drawing 803-1385620, except that they may be forged or
die cast.
3.4.10.3 Size. Valve handwheels shall be sized so that a tangential
force no more than the value specified in table II is required to be exerted
on the rim of the handwheel to affect closure of the valve against a differ-
ential pressure equal to the cold working pressure of the valve and pass the
hydrostatic pressure test of 4.6.5.
TABLE II.
Maximum allowable tangential force to operate valve
reset mechanism based on valve handwheel size.
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