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The momentary opening and re-clos-
ing of the Piston Assembly at the Fire
Sprinkler Line Seal traps a portion
of the pressure increase within the
fire sprinkler system. Trapped pres-
sure increases within the fire sprinkler
system help to prevent a subsequent
surge in the supply pressure from
causing the water-flow detector to
signal a false alarm.
As indicated above, domestic system
usage can reduce the pressure avail-
able to the fire sprinkler system.
However, when utilizing the Model
RSV-1 Valve, you do not need to include
additional hydraulic flow of the domes-
tic system, when otherwise required by
NFPA standards (NFPA 13D or 13R), to
determine the minimum possible resid-
ual (flowing) pressure available to the
fire sprinkler system.
For operation of the Model RSV-1 Resi-
dential Shut-Off Valve, you need only
design the fire sprinkler system from
the water supply main to the most
hydraulically remote sprinkler. Domes-
tic flow does not require consideration.
As long as the single sprinkler flow is
equal to or greater than 12.5 GPM (47,3
LPM) for the 1 Inch Valve or 8 GPM
(30,5 LPM) for the 2 Inch Valve when
the supply pressure at the main is at
its minimum expected value, the Model
RSV-1 Valve automatically diverts the
domestic flow.
After the Piston Assembly has moved
to the full up position, only a small
amount of water is permitted to trickle
through the Internal By-Pass Restric-
tion to the Domestic Port (Ref. Figures
4 and 5). The trickle flow through the
Internal By-Pass Restriction permits
the Model RSV-1 Valve to reset auto-
matically after a sprinkler operation or
test without draining the fire sprinkler
system.
When the Domestic Control Valve is
closed, the Internal By-Pass Restriction
allows the Supply and Domestic Port
pressures to equalize and the Piston
Assembly to move back down to the
standby position.
When using the 1 inch RSV-1, the
maximum flow rate through the Internal
By-Pass Restriction, when the Model
RSV-1 Valve is in the operated position,
is no greater than 0.25 GPM (0,9 LPM)
for a typical residual (flowing) pressure
of 40 psi (2,8 bar) at the inlet. Conse-
quently, when performing hydraulic
design calculations for the fire sprinkler
system, you do not need to consider
trickle flow through the Model RSV-1
Valve Internal By-Pass Restriction into
the domestic system.
Components:
1 -
Body
-
2
2
Top Cover
3 -
Screw,
5
Upper Cap
-
4
Upper Cap
3
5 -
O-Ring,
Cover (2)
4
6 -
Upper Seal
6
7 -
O-Ring,
Upper Sleeve
7
8 -
Sleeve
9 -
Spring
8
10 -
Differential
9
Ring
11 -
Lower Seal
1
12 -
Screw,
Piston (4)
12
13 -
Bottom Cover
-
13
14
Piston
15 -
O-Ring,
Lower Sleeve
PORT, 1" NPT
1 INCH (DN25) MODEL RSV-1 RESIDENTIAL SHUT-OFF VALVE
ASSEMBLY AND DIMENSIONS
12
10
1
Components:
1 -
Body
6
-
2
Insert Sleeve
5
3 -
Bottom Seal
-
4
Piston Cover
11
5 -
Piston Seal
-
6
Piston Insert
9
7 -
Piston Spring
-
2
8
Piston Nut
9 -
Insert Sleeve
4
O-Ring (2)
10 -
Cover O-Ring
9
11 -
Retainer Ring
12 -
Cover
3
-
13
Bottom Seal
13
O-Ring
7
8
2 INCH (DN50) MODEL RSV-1 RESIDENTIAL SHUT-OFF VALVE
ASSEMBLY AND DIMENSIONS
When using the 2 inch RSV-1, the
maximum flow rate through the Internal
By-Pass Restriction, when the Model
RSV-1 Valve is in the operated position,
is no greater than 1.5 GPM (5,7 LPM)
for a typical residual (flowing) pressure
of 40 psi (2,8 bar) at the inlet. Conse-
3-5/8" DIA.
(92,1 mm)
DOMESTIC
WATER
SUPPLY
FIGURE 2
5-3/8" DIA.
(136,5 mm)
WATER
SUPPLY
3-3/4"
PORT, 2" NPT
(95,3 mm)
FIGURE 3
quently, when performing hydraulic
design calculations for the fire sprin-
kler system, a 1.5 GPM (5,7 LPM) flow
demand is required to be added at
the RSV-1 and calculated back to the
source.
TFP982
Page 3 of 6
FIRE
SPRINKLER
PORT, 1" NPT
3-1/4"
PORT,
(82,6 mm)
1" NPT
8-3/16"
15
(208,0 mm)
10
4-15/16"
11
(125,4 mm)
14
5
2-3/8"
(60,3 mm)
FIRE
SPRINKLER
PORT, 2" NPT
DOMESTIC
PORT,
2" NPT
4-1/2"
(114,3 mm)
9-1/16"
(230,2 mm)
4-9/16"
(115,9 mm)
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