Potter Releasing Systems - Manual (Page 29)

29
AIR PRESSURE SUPERVISION
Dry Pipe System Waterflow And Air Supervisory Switch
Selection Guide
Fig. 9
PS40 SHOULD BE
INSTALLED IN LINE
WITH “BVL” VALVE
FOR TEST PURPOSES
PS40-1
LOW PRESSURE (SET AT 30 PSI)
PS40-2
LOW AND HIGH PRESSURE
(SET AT 30 AND 50 PSI)
Note: Unless excess pressure is pumped into the system, the waterflow device should have a retard. Per NFPA
72 2010 23.8.5.10.4, there shall be no shut-off valve in line to a pressure type waterflow switch, unless the shut-
off is electrically supervised. Potter Model RBVS can electrically supervise shut-off ball valves.
WATERFLOW
SWITCH
PS10-1
SINGLE CONTACT
PS10-2
DOUBLE CONTACTS
TO WATER
MOTOR GONG
PS10
PETCOCK
(OPEN)
WATER BY-PASS
TEST VALVE
(CLOSED)
CHECK RBVS
BALL DRIP
VALVE
ALARM LINE
SHUT-OFF VALVE,
SUPERVISED
(OPEN)
DRIP
CUP
WATER
PRESSURE
GAUGE
CHECK
WATER PRESSURE
FROM CITY MAINS
DRAIN
PIPE DWG# 8704200-7A
OS & Y
CONTROL VALVE
(OPEN)
TAMPER
DEVICE
OSYSU
DRAIN VALVE (CLOSED)
INTERMEDIATE
CHAMBER
SHUT-OFF VALVE
(CLOSED)
WATER LEVEL
AIR
PRESSURE
PRIMING
CHAMBER
BVL BLEEDER
TEST VALVE
(OPEN)
AIR PRESSURE
GAUGE
PS40
RISER TO
SPRINKLER HEADS
TO AIR SUPPLY
AIR
SUPPLY
VALVE
(OPEN)
CHECK