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|  MIL-P-8258D(AS)
shall be expanded between the handle and the stem passage to eliminate
the possibility of the piston striking against the lower plate or check
valve plate, if provided.
A short length of ceil spring shall be installed
around the stem to take up the shock at the end of the return stroke.
The piston shall be installed on the stem
3.4.6.3
Piston.
opposite the handle and shall consist of a cup and at least two washers,
one on each side of the cup.
The cup shall be of synthetic rubber or of
any other suitable material. The cup material shall be self-lubricating
to prevent drying.
The washers shall be of such diameter and configuration
that the cup will permit the passage of air on the return stroke and a
minimum of leakage on the down stroke.
3.4.7
The hose shall be of the woven style with an
Hose.
inner tube of nonblooming compound of seamless construction and an
abrasion-resistant outer cover.
The hose shall have a l/2-inch minimum
inside diameter and a l-inch maximum outside diameter.
The construction
of the hose shall be such that the hose shall not burst or leak during
usage .
3.4.7.1
Each hose shall be provided with an
Hose connector.
internally threaded connector on one end and an externally threaded
The threads on the
connector on the other end as shown in figure 1.
The
respective hose connectors shall be as specified in figure 1.
connectors shall be serrated and secured to the hose by means of a
ferrule.
The connector on the externally threaded end shall be constructed
so as to allow full rotation of the threaded portion (in either direction)
for connection to the life raft toppingoff valves.
3.5
Threads.
Threads shall be in accordance with Handbook
H-28.
3.6
Performance .
--
3.6.1
Operation.
The pump shall pass the operation test
specified in 4.7.1.
3.6.2
Air discharge.
The pump shall pass the air discharge
tests specified in 4.7.2.1 and 4.7.2.2.
3.6.3
Operating force.
The pump shall pass the operating
force test specified in 4.7.3.
The pump shall pass the leakage test
3.6.4
Pump leakage.
specified in 4.7.4.
5
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