Design Criteria
The RSV-1 must be installed vertically
with the Water Supply Port at the bot-
tom, the Fire Sprinkler Port at the top,
and the Domestic Port at the side. The
typical arrangement is shown in Figure
1.
Local regulations concerning public
water supplies may require a backflow
prevention device. The design of the
RSV-1 anticipates that the backflow
prevention device will be located in the
water supply upstream of the RSV-1
as shown in Figure 1. Should the local
regulations require the backflow pre-
vention device to be located in the fire
sprinkler line downstream of the
RSV-1, a by-pass per Figure 2 must be
installed.
NOTES
A check valve is not to be installed
between the RSV-1 and the fire sprin-
klers unless a by-pass per Figure 2 is
installed. Absence of the by-pass may
result in defeating the automatic reset-
ting capability of the RSV-1.
Installation of the by-pass defeats the
ability of the RSV-1 to perform as a
check valve.
Minimum Water Supply Require-
ments. In order for the 1 Inch (DN25)
RSV-1 Valve to automatically operate,
once a fire sprinkler operates, the fire
sprinkler system from the water main
to the most hydraulically remote sprin-
kler must be designed to provide a
minimum single sprinkler flow of 12.5
GPM (47,3 LPM), when the supply
pressure at the main is at its minimum
expected value.
NOTES
The minimum single sprinkler flow rate
of 12.5 GPM (47,3 LPM), required for
use with the RSV-1 Valve, does not
take precedence over any more hy-
draulically demanding single sprinkler
flow rate specified for the residential
sprinklers being utilized.
It is not necessary to take into account
the trickle flow through the RSV-1
Valve By-Pass Restriction, into the do-
mestic system, when performing hy-
draulic design calculations for the fire
sprinkler system.
Operating
Principles
The design of the RSV-1 Valve is such
that if there is a fire sprinkler operation
during domestic usage, the RSV-1
Valve will automatically shut off flow to
the domestic system and divert the
available water supply to the fire sprin-
kler system, thereby eliminating the
lower flow into the sprinkler system
that might otherwise be caused by
possible significant domestic water us-
age.
WhentheRSV-1Valveisinthenormal
standby position as shown in Figure 3,
the Piston, assisted by the Spring, is in
the down position. With the Piston in
the down position, the Fire Sprinkler
Seat permits the RSV-1 to perform as
a conventional check valve. Also, with
the Piston in the down position, water
is available on demand through the
Domestic Flow Passage and out the
Domestic Port.
Upon operation and a minimum design
water flow (i.e., 12.5 gpm) to the auto-
matic residential fire sprinkler system,
the Piston moves upward. With the
Piston in the up position, any water
Page2of6
TFP980
FIGURE 1
TYPICAL ARRANGEMENT
FIGURE 2
REQUIRED BY-PASS
FOR BACKFLOW PREVENTION
IN THE FIRE SPRINKLER LINE
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