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|  MIL-V-15508B
Table I - Materials (Cont'd).
3.3 Design. The valves shall be of the globe (type I) or angle (type II) type main
valve, controlled by a pilot valve employing the fluid flowing through the main valve to
rapidly (not more than 2 seconds maximum) open or close the main valve. The movement of the
main valve disc shall be positively actuated by the movement of a rubber diaphragm when it
is subjected to fluid pressures from 50 to 250 p.s.i. while controlling fluid in a similar
range of pressures. Diaphragms shall not be used as a disc or seating element. Weight and
size of the assembled unit shall be kept to a minimum.
3.3.1 A pilot control valve of a multiple port design shall be furnished to provide
for the quick opening and closing of the main valve, and shall be operable with electrical
or mechanical operating mechanism (see 3.3.12) .
3.3.2 Valves shall be so designed and constructed that failure of the diaphragm will
cause the valve to remain open,
3.3.3 The design of all valves shall be such as to afford easy access for adjustment
and repair without removal from the line.
#
3.3.4 Body. The main valve body shall be designed for class A 150 or class B 250
p.s.i. fluid service. Hydrostatic (water) test pressure shall be as follows:
Class A - 150 p.s.i. service - 225 p.s.i. hydrostatic test,
Class B - 250 p.s.i. service - 375 p.s.i. hydrostatic test.
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