Globe RCW Manual

Model Rcw Dry System VALVE

GENERAL DESCRIPTION

The Globe Model RCW* dry valve is a hydraulically oper-
ated external resetting differential latching style valve. The
Model RCW dry valve is used as an automatic water control
valve in dry applications. The Model RCW dry valve serves
as the primary water control valve installed in the water
supply to a dry sprinkler system incorporating automatic
(closed) sprinklers with compressed air or nitrogen within
the system piping.
Setting of the Model RCW dry valve requires water pressure
in the pressure chamber being maintained on the plunger
rod. The pressure on the plunger rod forces the lever arm/
roller assembly against the clapper which in turn keeps
the supply water from entering the sprinkler system pip-
ing. Water pressure is provided to the pressure chamber
through a connection to the main water supply at a point
upstream of the system main control valve. This connection
also supplies water pressure up to the dry pilot actuator.
The dry pilot actuator is held closed when in the normal set
condition by air pressure in the system piping. When system
air pressure is relieved via one or more operated sprinklers,
the dry pilot actuator will open, allowing the pressurized
water to be evacuated from the pressure chamber.
In the standby condition, the valve is normally closed and
will automatically activate (trip) upon the activation of an au-
tomatic sprinkler, as a result of a fire condition. The RCW
valve may also be operated by means of a manual release,
which is provided in the trim, to override the normal activa-
tion sequence described above.
When heat from a fire opens an automatic sprinkler, water
pressure in the pressure chamber decays resulting in the
movement of the push rod assembly, releasing the lever
arm/roller assembly from the clapper. The system water
supply pressure forces the valve clapper open resulting in
water flow into the system piping. Upon system activation,
fire alarm signaling is provided by means of flowing water
through the alarm port/intermediate chamber and associ-
ated alarm line trim. The flow of water activates a pressure
switch which in turn notifies local alarms and/or an alarm
signaling monitoring service.
has been shut, the system drained, and
sprinklers replaced, the RCW dry valve is easily set/reset by
means of pushing the reset knob. The system is now ready
for the introduction of compressed air back into the system
piping.
If the speed of operation of the dry valve needs to be in-
creased, an optional accelerator can be utilized to decrease
the trip time of the valve from the operation of a sprinkler or
the inspectors test connection.
MAR 2018
4077 Airpark Dr. Standish, MI 48658 • 989-846-4583 •
Technical Support
After the main control valve
any operated
GFV-305 (Formerly H-3)
989-414-2600
• • techservice@globesprinkler.com
MODEL RCW DRY SYSTEM VALVE

TECHNICAL DATA

Approvals
•
cULus
•
FM
Maximum System Working Pressure
•
300 psi (20.6 Bar)
End Connections
•
Groove x Groove
Materials of Construction
•
See Technical Datasheet H-1 for materials of
construction for the Model RCW Valve
*Patents Pending
www.globesprinkler.com
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