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| MIL-F-5508B
not show any leakage in excess of
operation shall be made during
that specified herein, as observed
the warm-up period at approxi-
by movement of the actuating
mately equal increments of time.
cylinder piston.
The volumetric capacity shall be
within the limits specified in Fig-
4.6.10 Bleeding. The fuse shall be installed
ure 7. The length of tubing re-
substantially as shown in Figure 1 with the
quired between the transfer cylin-
fuse completely void of fluid and without
der and the fuse, to aid fluid
bleeding. Rated flow shall be directd through
temperature stabilization and to
the fuse in the direction for closing. The
forestall inadvertent closing of
quantity of fluid passed through the fuse be-
the fuse, shall be 12 feet (1/2 inch
fore closing shall be measured. The fuse shall
O.D.-See Figure 3). This length
pass its volumetric capacity without prelim-
of tubing shall be speified on the
inary bleeding.
manufacturer's installation draw-
ings.
4.6.11 Resetting. The apparatus shall be
set up as shown in Figure 6.
4.6.8 Endurance. The fuse shall be in-
stalled in a set-up substantially in accordance
4.6.11.1 For fuses which do not require re-
with Figure 4 and subjected to 20,000 cycles
verse flow for resetting, the relief valve shall
of operation, each cycle to consist of passage
be set at rated pressure and flow shall be
of at least 90 percent of the rated volumetric
passed through the fuse until it closes. Rated
capacity in the closing direction with the fluid
pressure shall then be applied to the down-
at rated pressure (and reversal of flow to
stream side of the fuse while maintaing
fully reset the test fuses, where applicable).
pressure on the upstream side for a maximum
The means of limiting fluid volume shall then
of five seconds, following which rated flow
be removed and 100 additional cycles of full
shall be passed through the fuse. The fuse
closing and resetting shall be accomplished,
shall folly reset itself within a five-second
the closing pressure to be the rated pressure.
period without the aid of reserve flow. The
quantity of fluid passed through the fuse be-
4.6.9 Acceleration. The apparatus shall be
fore it closes shall be measured and shall be
set up as shown in Figure 5.
within the limits specified herein.
(a) With the fuse bled and in the open
4.6.11.2 For fuses which require reverse
position and installed in a direc-
flow in order to reset themselves, the relief
tion so that acceleration will tend
valve shall be set at rated pressure and flow
to close it, an acceleration of 12
shall be passed through the fuse until it fully
g's shall be developed by the
closes. The fuse shall fully reset itself after
mechanism. Rated flow shall be
passage of a maximum of eight cubic inches
applied through the fuse after a
or 20 percent of the rated volumetric capacity
minimum time of two seconds at
(whichever is greater) in the reverse flow
the acceleration. The volumetric
direction at rated flow capacity. Rated flow
capacity shall not vary from the
shall then be applied through the fuse in the
Emits specified herein.
direction for closing. The quantity of fluid
(b) With the fuse mounted in a direc-
passed before the fuse closes shall be meas-
tion so that acceleration will tend
ured and shall be within the limits specified
to open it, 40 psi pressure shall be
herein.
applied on the fuse in a closed
4.6.12 Burst pressure. The hydraulic fuse
position. An acceleration of 12
g's shall be developed and held for
shall withstand, without rupture, a hydro-
static pressure equal to 2.5 times the rated
a minimum period of two seconds
and then stopped. The fuse shall
pressure. The pressure shall be gradually
9
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