flow to the Domestic Flow Port is di-
verted to the Fire Flow Port.
The contours of the Piston have been
specifically configured to minimize its
upward movement except under the
level of sustained fire sprinkler system
flow resulting from operation of one or
more fire sprinklers. However, be-
cause most fire sprinkler systems con-
tain air pockets, the Piston will tend to
move momentarily upward if there is a
surge in supply pressure. The momen-
tary opening and reclosing of the Pis-
ton at the Fire Sprinkler Seat will trap
a portion of the pressure increase
within the fire sprinkler system. The
trapping of pressure increases within
the fire sprinkler system will help to
reduce the possibility of a subsequent
surge in the supply pressure from
causing the waterflow detector to sig-
nal a false alarm (unless a by-pass is
installed per Figure 2).
As indicated above, domestic system
usage may reduce the pressure avail-
able to the fire sprinkler system. How-
ever, when utilizing the RSV-1 Valve,
it is not necessary to take into account
the complex hydraulic modeling of the
domestic system that would otherwise
be required to determine the minimum
possible residual (flowing) pressure
that wouldbe available to the fire sprin-
kler system.
For operation of the RSV-1 Valve, it is
Components:
1 - Body
2-TopCover
3-Screw,
Upper Cap
4 - Upper Cap
5 - O-Ring,
Cover
(2 req’d)
6 - Upper Seal
7 - O-Ring,
Upper Sleeve
8 - Sleeve
9-Spring
10 - Differential
Ring
11 - Lower Seal
12 - Screw,
Piston
(4 req’d)
13 - Bottom Cover
14 - Piston
15 - O-Ring,
Lower Sleeve
FIGURE 2
MODEL RSV-1 RESIDENTIAL DOMESTIC SHUTOFF VALVE
—ASSEMBLY AND DIMENSIONS—
TFP980
Page3of6
FIGURE 3, STANDBY AND OPERATED POSITIONS FOR MODEL RSV-1 VALVE
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