Technical data

An external reset knob on the back left hand (pushrod) side of the Model DDX Deluge Valve allows
the user to reset the valve without removing the faceplate. (Figure D). It is important to note that ALL
pressure must be relieved from the push rod chamber prior to resetting the valve. This can be accom-
plished by opening the emergency manual release valve provided on the front left of each Model DDX
Deluge Valve assembly.
26.
The Model DDX Deluge Valve has an intermediate chamber built into the seat assembly which elimi-
nates the need for an additional system side check valve when the Model DDX Deluge Valve is used
to control preaction or low pressure dry systems that contain pressurized air or nitrogen. The interme-
diate chamber also removes the need for secondary main drain valves to facilitate draining of the fire
protection system piping.
The Model DDX Deluge Valve is available in six sizes: 2” (50mm), 2½” (65mm), 3” (80mm), 4” (100mm),
6” (150mm), and 8” (200mm). All six sizes are available with a cast ductile iron body with grooved
inlet and outlet connections. The 4” (100mm) and 6” (150mm) sizes are also available with flanged
inlet and flanged outlet connections, or flanged inlet and grooved outlet connections. The 8” (200mm)
size is also available with flanged inlet and flanged outlet connections. Flange options include class
150 & class 300. All working components of the valve are field replaceable without removing the valve
from the riser. The Model DDX Deluge Valve is rated at 250 psi (17.2 bar), 4” & 6” are rated to 300 psi
(20.7 bar) working pressure, factory tested at 500 psi (34.5 bar), and is listed and approved by various
agencies worldwide.
Figure D:
DDX VALVE REAR VIEW