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| MIL-V-17501F(SH)
3.5.2.3 Class 3. The spring-loaded lift check valve shall be constructed to be held in the
closed position by an internal valve spring when the control system piping is not pressurized. The
valve shall be constructed to open fully and establish flow through the valve when hydraulic
pressure is applied to the inlet side of the valve. The valve shall close completely when hydraulic
pressure is applied in the reverse direction through the outlet side of the valve. This valve shall
permit the control system to be operated from more than one operating station by preventing
reverse flow.
3.5.2.4 Class 4. The hydraulic operated check valve shall be constructed to be held in the
closed position by an internal valve spring. The valve shall open fully when hydraulic pressure is
applied to the valve through an actuation connection and close completely when pressure is
relieved. This valve shall provide the means for venting the hydraulic pressure from the sprinkler
supply valve, thereby permitting the sprinkler supply valve to close.
3.5.2.5 Class S. The hydraulic operated control valve shall be constructed to be held in the
closed position by an internal valve spring when the control system piping is not pressurized. The
valve shall open fully when hydraulic pressure is applied to the valve through an actuation
connection. The valve shall close completely by a combination of valve spring force and firemain
pressure when hydraulic actuation pressure is relieved. This valve shall admit seawater at full
firemain pressure to the actuation portion of the sprinkler supply valve, thereby permitting the
sprinkler supply valve to open.
3.5.2.6 Class 6. The three-way control valve shall be constructed to control the operation
of the sprinkler head valves in a wet type sprinkler system. The valve shall be a three-way valve
with a control system actuating connection and shall permit hydraulic pressure from a pressurized
accumulator tank to be applied to the sprinkler head valves when the control system is not
operating, thereby permitting the sprinkler head valves to remain closed. The valve shall isolate
and release pressure from the sprinkler head valves when the control system is actuated, thereby
permitting the sprinkler head valves to open.
3.5.3 Type II. Unless otherwise specified (see 6.2), control valves of the type II classification
shall be constructed for manual operation. This valve shall be of the three-port, three-position or
the three-port, two-position rotary disc plate construction with an operating mechanism containing
a device for locking the valve in any of its positions (see 3.6.1 1). The valve shall have one inlet
(supply) port and two outlet ports. This valve shall permit manual control of the hydraulic sprinkler
control system. Type II valve construction shall be as specified (see 3.6 through 3.6.16).
3.6 Construction. Valves covered in this specification shall meet the physical limitations and
stress requirements as specified.
3.6.1 Configuration. Type I valves shall be configured for in-line installation. Type H valves
shall be configured for through bulkhead type mounting. Type I, class 1 valves shall be configured
for flanged installation. Type I, class 2 through 4, and type II valves shall be configured for 3/13-inch
nominal pipe size (rips) union installation. Type I, class 5 valves shall be configured for l-inch
union installation and class 6 valves shall be configured for 1 /2-inch union installation.
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