MIL-DTL-16356E
3.10.2.2 Seat leakage. Seat leakage shall not exceed 10 cubic centimeters (cm3) per hour per inch of nominal
pipe size (see 4.7.1.3).
3.10.3 Valve closure. Valves shall close by clockwise rotation of the wheel. Hand-wheels for drain valves
shall be ductile iron for Type B and C gauges. Sprocket wheels shall be made of the material specified in 3.12.10.e.
or 3.13.8.c, as applicable, and shall be sized so that the torque specified in table III shall open or close the valves
under all operating conditions.
3.10.4 Automatic ball-check. An automatic ball-check feature shall be included in the bottom fitting of the
gauge. This ball-check may be either furnished as part of the bottom shut-off valve or may be enclosed in the
bottom gauge connectors or fittings. The ball-check shall be solid ball type with the ball material being MonelTM or
equal. Upon breakage of the gauge glass, the ball-check shall close automatically by vertical lift of the ball, such
vertical lift not less than 3/8 inch. The ball shall be not less than 9/16 inch in diameter and the diameter of the circle of
contact with the seat shall not be greater than two-thirds of the diameter of the ball. The ball shall be accessible for
inspection. A ball-check feature shall not be included in the top fitting.
3.10.5 Gland packing and piping gaskets. Gland packing for valve stem stuffing boxes shall be in accordance
with MIL-P-24503, Type II, Class 2 and MIL-P-24583, Class 2, Grade 1 or N as specified (see 6.2). The packing
set shall consist of one graphitic yarn packing ring, followed by two to four graphitic seal rings and one graphitic
yarn packing ring. Replacement graphitic seal rings are to be provided with a single 45-degree angle cut. Packing
gland nut tightening shall not exceed the following consolidation torque limits: 84 inch-pounds for ½ inch size and
168 inch-pounds for ¾ inch size for Class I and II valves; and 180 inch-pounds for ½ inch size and 240 inch-pounds
for ¾ inch size for Class IV valves. Flange bonnet and piping gaskets within the gauge shall be spiral wound gaskets
in accordance with MIL-G-24716 suitable for the pressures and temperatures specified herein. Winding material
shall be Class A (CRES 304) unless Class B (Inconel) is specified (see 6.2). Where carbon steel glands are used,
they shall be zinc plated in accordance with ASTM B633, Type II, SC 4. Salt spray test is not required.
3.10.6 Drain valves. Drain valves of the quantity and size as specified (see 6.2) shall be attached to the bottom
fitting in such a manner that the gauge glass shall be drained with the shut-off valves open or closed. Valves shall
be in accordance with 803-2177525 for Class 600 carbon steel and 803-5184193 for Class 1500 carbon steel. Parts
for valves shall be fully interchangeable with parts shown on the drawing revision in effect at contract award.
3.10.7 Hardfaced surface inspection. Dye penetrant inspection of hardfaced surfaces shall be in accordance
with T9074-AS-GIB-010/271 and the acceptance standards of MIL-STD-2035, Class 1 weld.
3.10.8 Yoke bushing locking. A weld bead shall be applied to the top of the bonnet at assembly to act as a stop
for the yoke bushing, preventing the bushing from unscrewing.
3.11 Flanges. Mounting flanges shall be in accordance with ASME B16.5. Other flanges used within the
gauge assembly shall meet the requirements specified herein.
3.11.1 Flange finishes. Flanges shall be prepared for use with spiral wound gaskets. Flange finishes shall be as
follows:
a. Gasket contact surfaces of flanges for use with sheet gaskets, if used, shall have concentric or spiral
serration of 63 to 500 Roughness Height Rating (RHR) produced by machining cuts of a minimum of 0.002 inch in
depth in the minimum range of 30 serrations per inch of face width. The tips of the serrations shall not exceed
0.010 inch in width.
b. Gasket contact surfaces of the flanges for use with spiral wound gaskets shall have a finish with a circular
lay (concentric or spiral) having a roughness not exceeding 500 RHR produced by machining cuts of 0.003 inch
maximum depth with not less than 40 cuts per inch of face width.
3.12 Type A.
3.12.1 Configuration. Type A gauges shall consist of frame body-sections, each section having a continuous
vision slot viewed through single-piece glass insert sets. Color shall not be used.
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