TOTALPAC2 Page 1 of 2
TOTALPAC2 Integrated Fire Protection System
Accelerator Option
FM-086G-0-45B
Viking Accelerator:
The Viking Model E-1 Accelerator is a quick-opening
device. When installed with the required external Anti-flood
Device (on dry pipe systems only), it is used to increase the
operational speed of a differential type valve. An
accelerator (quick-opening device) is recommended on all
differential dry pipe valves and is required on dry pipe
systems of certain capacities. Refer to NFPA Standards
and Authorities Having Jurisdiction. The Viking Model E-1
Accelerator may also be used without the Anti-flood device
to speed the action of a pneumatic release system on a
deluge, flow control or preaction system.
Features:
.A Automatically resets.
.B External anti-flood Assembly.
.C UL Listed for use on systems of maximum capacity
allowed.
.D Factory tested.
Operation:
The Viking Model E-1 Accelerator operates on the principle
of unbalanced pressures. As the accelerator is
pressurized, air enters the inlet chamber, goes through the
screen filter into the middle chamber and through an orifice
into the lower chamber. From the middle chamber, air
slowly enters the upper chamber through a filtered orifice
restriction in the cover diaphragm.
In the SET position, the system air pressure is the same in
all chambers. When a sprinkler or release device operates,
the pressure in the middle and lower chambers is reduced
at the same rate as the system pressure. The orifice
restriction in the cover diaphragm restricts the air flow from
the upper chamber, temporarily causing higher pressure in
the upper chamber.
The pressure differential forces the cover diaphragm down,
pushing the actuator rod down. This action vents the
pressure from the lower chamber to the outlet vent,
allowing residual pressure in the inlet chamber to force the
clapper diaphragm open. After the clapper diaphragm
opens, any pressure remaining in the inlet chamber and
associated piping is vented to atmosphere.
On a pneumatic release system, when the accelerator
operates, the outlet pressure is vented to atmosphere,
speeding the release system operation.
To enable the Accelerator Device:
The Accelerator Device is enabled the Air Bypass Valve is
opened (handle aligned with the valve body). The system air
pressure should be higher or equal to the pressure indicated
on the pressure gauge (3) prior to opening the Main Water Ilet
Valve (D1).
Ensure that the Air Bypass Valve is open (handle aligned with
the valve body) in normal supervisory mode.
To isolate the Accelerator Device:
Close the Air Bypass Valve, positioning the handle across the
valve body. This operation can be necessary in order to verify
the pressure adjustments or to allow the pressure switches
adjustments.
Refer to instructions described on Viking datasheet no. 122
(Form No. 071692).
Viking Accelerator Model E-1 :
(for preaction systems & pilot lines)
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