4.
however, eliminate another important facet of good main-
tenance, namely, periodic cleaning and inspection of the
internal valve parts.
A valve body drain is provided in the event that water
builds up due to condensate from the air supply system or
water left inside form system testing. After closing the main
supply valve, the condensate drain can be opened slightly
until the water inside the vale body and main pipe column
has drained. See the section titled “Draining Excess/Con-
densate Water from the System” in this bulletin for the de-
tailed procedure.
The Model B Manual Emergency Station is included in
the Reliable Type D Double Interlock Preaction System trim
sets. It consists of an aluminum nameplate mechanically at-
tached to a ball valve. The valve handle in its OFF position is
guarded against accidental turning to the ON position (and
system discharge) by a nylon cable tie provided with each
trim kit. The cable tie is inserted after the system has been
restored for operation. The nylon cable tie is designed to
allow, in case of an emergency, forceful turning of the valve
handle to the ON position. As an alternative to the Model B
Hydraulic Manual Emergency Station, the Model A Hydrau-
lic Manual Emergency Pull Box (see Reliable Bulletin 506) is
also available and can be provided as an option.
Whenever ambient temperature conditions are high, the
water temperature in the Model DDX Deluge Valve push-
rod chamber could possibly increase, thereby increasing
the pressure in the chamber to values exceeding the rated
pressure of the system. In an indoor installation where stan-
dard room temperatures are exceeded, a pressure relief kit
may be needed. Pressure relief kit, P/N 6503050001, can
be installed into the pushrod chamber’s releasing line to limit
the pressure to 250 psi (17.2 bar).
Reliable Model DDX Deluge Valve with associated Type D
Double Interlock Preaction Trims sizes 2” (50 mm), 2½” (65
mm), 76 mm, 3” (80 mm), 4” (100 mm), 165 mm, 6” (150
mm) and 8” (200 mm) are rated for use at a minimum water
supply pressure of 20 psi (1.4 bar) and a maximum water
supply pressure of 250 psi (17.2 bar) for 2” (50mm), 2½”
(65mm), 3” (80mm), 76mm and 8” (200mm) valve sizes
and 300 psi (20.7 bar) for 4” (100mm), 6” (150mm) and
165mm valve sizes. Water supplied to the inlet of the valve
and to the pushrod chamber must be maintained between
40
°
F (4
°
C) and 140
°
F(60
°
C).
1A_COMMDDX_EMR
PLASTIC
TO
DRIP CUP
NYLON TIE
TO AUTOMATIC
RELEASING DEVICE(S)
FROM TOP OF PUSH
ROD CHAMBER
PUSH ROD CHAMBER
WATER PRESSURE GAUGE
TUBING
EMERGENCY MANUAL RELEASE STATION
NORMALLY CLOSED AND SECURED. ROTATE HANDLE DOWN
TO VENT PUSH ROD CHAMBER AND RELEASE SYSTEM.
Fig. 2
Summary of Contents for DDX
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