Specifications

19.
Pressurizing Line Connection
The water supply for the push-rod chamber must be pro-
vided by connection of its inlet pressurizing line to the wa-
ter supply piping. Pressurizing lines for multiple Model DDX
Deluge Valve push-rod chambers must never be manifold-
ed together, having only a single tap on the water supply
piping. Each Model DDX Deluge Valve must have its own
push-rod chamber pressurizing line connection.
This connection must be made on the supply side of the
water supply control valve (see Fig. 7 or Fig. 8). This can be
accomplished by:
• Using a tapped connection directly below or next to the
main water supply control valve using a welded outlet
or the appropriate mechanical fittings. A grooved-end
outlet coupling is one way to achieve this; or
• Using a water supply control valve that has an available
threaded (NPT) supply-side tap design to allow for a di-
rect water supply connection to the Model DDX Deluge
Valve’s push-rod chamber.
Caution: Reliable’s DDX valve is designed with an inlet re-
striction built into the pushrod chamber. It is important not to
introduce additional restrictions into the direct water supply
connection or the discharge from the pushrod chamber by
installing additional valves or improperly installing the cop-
per lines used in the trim of the valve.
Hydrostatic Testing of DDX Valves and DDX
Systems
As required by NFPA 13, fire sprinkler systems with work-
ing pressures up to and including 150 psi are to be hydro-
statically tested at a water pressure of 200 psi and maintain
that pressure without loss for two hours. Fire sprinkler sys-
tems with working pressures above 150 psi are required to
be hydrostatically tested at 50 psi above the system work-
ing pressure and maintain that pressure without loss for two
hours. In addition to the hydrostatic tests described above,
dry pipe and double interlock preaction systems require an
additional low pressure air test.
In some cases, hydrostatic testing (in accordance with the
NFPA 13 requirements noted above) will result in pressures
that exceed the working pressure of the valve and trim kit for
the two-hour test period. The valve and applicable trim kit
have been tested, approved and listed under these con-
ditions and as such, hydrostatic testing in accordance
with NFPA 13 is acceptable. In addition, the clapper can
remain in the closed position and the trim kit need not
be isolated, as each has been designed to withstand hy-
drostatic testing as required by NFPA 13.
Hydrostatically testing the valve and trim to pressures
higher than their rating is limited to the hydrostatic
test as referenced by NFPA 13. It does not address the
occurrence(s) of a “water hammer” effect, which can in-
deed damage the valve. A “water hammer” in the water
supply piping of the valve can create pressures in ex-
cess of the rated pressure and should be avoided by all
necessary means. This condition may be created from
improper fi re pump settings, underground construction
work, or an improper venting of trapped air in the water
supply piping.
System Design Considerations
The automatic sprinklers, wet pilot line sprinklers/ detec-
tors, and signaling devices which are utilized with the Wet
Pilot Line Single Interlock Preaction System must be UL or
ULC Listed, as applicable.
The automatic sprinklers, air compressor, releasing de-
vices, electric releasing control equipment, fire detection
devices, manual pull stations, and signaling devices which
are utilized with the Electric Actuation Single Interlock Preac-
tion System must be UL or ULC Listed or FM Approved, as
applicable.
The automatic sprinklers, air compressor, releasing de-
vices, electric releasing control equipment, fire detection
devices, manual pull stations, and signaling devices which
are utilized with the Dry Pilot Line Single Interlock Preaction
System must be UL or ULC Listed, as applicable.
The Deluge Valve, and all interconnecting piping must be
located in a readily visible and accessible location and in an
area that can be maintained at a minimum temperature of
40°F (4°C). Note: Heat tracing is not permitted.
Pendent sprinklers, other than dry pendents, used on pre-
action systems shall be installed on return bends per NFPA
13.
In Electric Actuation Single Interlock Preaction Systems,
the solenoid valve is operated and supervised by the electri-
cal releasing/control panel.
In Wet Pilot Line Single Interlock Preaction Systems, the
wet pilot line is only a detection system and does not con-
tribute to controlling the fire. Its installation is subject to the
following restrictions:
a. It is not to be installed in an area subject to freezing.
b. It is not to be installed in an area where tempera-
tures in excess of 150°F (65°C) are anticipated.
c. NFPA 72 or the authority having jurisdiction should
be consulted for spacing and elevation require-
ments.
d. Maximum wet pilot line length and height must com-
ply with data provided in Fig. 2.