Star S430 User manual

Dry Pipe Valve Accelerator
Model S430
GENERAL DESCRIPTION
The Star Model S430 Accelerator is a quick opening de-
vice intended for attachment to either the 4 or 6 inch Star
Model A or A-1 Dry Pipe Valves.The S430 reduces the
time for valve operation following the operation of one or
more automatic sprinklers.
The S430 automatically adjusts to both small and slow
changes in system pressure, but trips when there is a
rapid and steady drop in pressure (as in the case of a
sprinkler operation).Upon tripping, the Accelerator trans-
mits system air pressure to the intermediate chamber of
the Model A or A-1 Dry Pipe Valve.This neutralizes the
differential pressure holding the Model A or A-1 Dry Pipe
Valve closed and permits it to open.
The S430 has a unique, positive action, internal anti-flood
device and a ball float which combine to prevent water
and water borne debris from entering the more sensitive
operating areas of the accelerator. The anti-flood device
seals and latches immediately upon operation of the
S430 without having to wait for a pressure build-up in the
intermediate chamber of the dry pipe valve. The latching
feature keeps the anti-flood device sealed, even while the
system is being drained.The ball float seals the pilot
chamber inlet port if there is an inadvertent trip of the dry
pipe valve, due for example, to an air compressor failure
combined with a slow loss in system air pressure due to a
leak. WARNING
The Model S430 Dry Pipe Valve Accelerator described
herein must be installed and maintained in compliance
with this document, as well as with the applicable stand-
ards of the National Fire Protection Association, in addi-
tion to the standards of any other authorities having juris-
diction. Failure to do so may impair the integrity of this
device.
The owner is responsible for maintaining his fire protec-
tion system and devices in proper operating condition.
The installing contractor or sprinkler manufacturer should
be contacted relative to any questions.
TECHNICAL DATA
Approvals
UL and ULC Listed.FM Approved.
NYC Accepted under MEA 177-99-E.
Maximum Working Water Pressure
175 psi (12.1 bar)
Maximum Working Air Pressure
60 psi (4.1 bar)
Pressure Decay For Trip
1 psi/min (0.07 bar/min)
Physical Characteristics
Body components constructed of alodine coated alumi-
num alloy with austenitic series stainless steel internal
components. Seals are EPDM and silicone.
OPERATION
The Inlet Chamber of the Accelerator (Figure 1 - Set Posi-
tion) is pressurized via its connection to the system (at a
point above the maximum expected level of priming plus
drain-back water).The Pilot Chamber is, in turn, pressur-
ized through its inlet port which is formed by the annular
opening around the lower tip of the Anti-Flood Valve.As
the Pilot Chamber increases in pressure, the Differential
Chamber is pressurized through the Restriction.
The Accelerator is in its Set position while it is being pres-
surized as well as after the Inlet, Pilot Chamber and Dif-
ferential Chamber pressures have equalized.When in the
Set position, the Outlet Chamber is sealed off by the Ex-
haust Valve which is held against its seat by a combina-
tion of the Spring pushing up against the Lever and the
net downward force exerted by the pressure in the Pilot
Chamber.
Both small and slow changes in system pressure are ac-
commodated by flow through the Restriction. When, how-
ever, there is a rapid and steady drop in system (i.e., Inlet
and Pilot Chamber) pressure, the pressure in the Differen-
tial Chamber reduces at a substantially lower rate.This
condition creates a net downward force on the Plunger
which rotates the Lever. As the Lever is rotated, the Relief
Valve is raised out of the Relief Port and the Anti-Flood
Valve is depressed downward into the Pilot Chamber Inlet
Port, venting the Pilot Chamber.
The system pressure in the Inlet Chamber then forces
(raises) the Exhaust Valve off its seat. This continues the
rotation of the Lever into the tripped (latched) position
(Figure 1 - Tripped Position). As the Exhaust Valve is
raised off its seat, system pressure is transmitted to the
intermediate chamber of the dry pipe valve which neutral-
izes the differential pressure holding the valve closed.
Following the dry pipe valve trip, major water borne de-
bris is prevented from entering the Accelerator (via the
connection to the system piping) by the Strainer located
at its Inlet.Water and any fine water borne debris such as
silt is prevented from entering the Pilot Chamber by virtue
of the Anti-Flood Valve having sealed off its inlet port. The
Check Valve located downstream of the Accelerator Out-
let prevents any water borne debris from entering the Ac-
celerator via the connection to the intermediate chamber
of the dry pipe valve.
414-570-5000 • 800-558-5236 • FAX [phone]
2-5.4.10
STAR SPRINKLER INC.
www.starsprinkler.com
#1306
OBSOLETE

After the Accelerator/dry pipe valve
has tripped and the sprinkler system
has been drained, the piping from
the system to the Accelerator must
also be drained and the Accelerator
reset/inspected according to the in-
structions given in the Setting Proce-
dure Section.The Accelerator is re-
set simply by unscrewing the
knurled Reset Knob until it resists
further turning and then screwing
the Reset Knob back in until it is fin-
ger tight.
The rate-of-flow through the Restric-
tion has been set such that the
S430 Accelerator provides the maxi-
mum practical sensitivity to a loss in
system pressure due to a sprinkler
operation while still being capable of
automatically compensating for nor-
mal variations in system pressure
such as are caused by environ-
mental temperature changes. A test
for verifying that the rate-of-flow
through the Restriction is within the
range for optimum Accelerator per-
formance is given in the Setting Pro-
cedure Section.
DESIGN CRITERIA
The connection to the system pip-
ing, Figure 3 or 4, must be located
so that drain back water will not flow
into the Accelerator piping and it
must be located at a point above the
maximum expected level of the prim-
ing plus drain-back/condensate
water.
If the connection is made to the
riser, it must be located at least two
feet above the level of the dry pipe
valve priming water. Connections to
a feed or cross main must be made
either to the side or top of the main.
NOTES
Failure to follow the above instruc-
tions can result in flooding of the Ac-
celerator and accidental tripping
due to clogging of its Restriction.
Quick operation of the Accelerator
does not ensure that the fire protec-
tion system will meet the water deliv-
ery time requirement of the authority
having jurisdiction (following open-
ing of the Inspector’s Test Connec-
tion). The sprinkler system designer
needs to be aware that water deliv-
ery time is primarily determined by
the configuration and volume of the
piping network, system air pressure
at time of Accelerator trip, and water
supply characteristics.
STAR SPRINKLER INC.
Page 2 2-5.4.10
Accelerator In Set Position
Accelerator In Tripped Position
FIGURE 1
MODEL S430 ACCELERATOR IN SET AND TRIPPED POSITIONS
OBSOLETE

STAR SPRINKLER INC.
2-5.4.10 Page 3
FIGURE 2
MODEL S430 ACCELERATOR ASSEMBLY
NO. DESCRIPTION..... QTY.PART
1 Base .......... 1 #1306-02
2 Cover.......... 1 #1306-03
3 Upper Diaphragm
Plate .......... 1 #1306-04
4 Pivot Plate
Assembly........ 1 #1306-05
4a SpirolPin........ 1 (Item4)
4b PivotPlate....... 1 (Item4)
5 Plunger ......... 1 #1306-06
5a Pan Hd. Machine
Screw.......... 1 (Item5)
5b Upper Diaphragm
RetainingRing..... 1 (Item5)
5c Upper Diaphragm . . . 1 (Item 5)
5d JamNut ........ 1 (Item5)
6 Exhaust Valve ..... 1 #1306-07
6a Upper Plug ....... 1 (Item6)
6b Washer......... 1 (Item6)
6c Lower Diaphragm . . . 1 (Item 6)
6d LowerPlug....... 1 (Item6)
6e O-Ring*......... 1 #1306-08
7 Rd. Head Machine
Screw,
1/4"-20 UNC x 5/8" . . 6 #1306-09
8 CoverGasket ..... 1 #1306-10
9 VentPlug........ 1 #1306-11
10 O-Ring*......... 1 #1306-12
11 Restriction ....... 1 #1306-13
12 Restriction Access
Plug........... 1 #1306-14
13 Pan Hd. Machine
Screw,
No. 10-32 UNF x 5/8" . 4 #1306-15
14 CotterPin ....... 1 #1306-16
15 Lever.......... 1 #1306-17
16 RetainingRing..... 1 #1306-18
17 Anti-FloodValve.... 1 #1306-19
18 ReliefValve ...... 1 #1306-20
19 Spring ......... 1 #1306-21
20 Relief Valve Seat . . . 1 #1306-22
21 O-Ring*......... 1 #1306-23
22 SealWasher...... 1 #1306-24
23 Latch.......... 1 #1306-25
24 Fillerster Hd.
Machine Screw,
1/4"-20 UNC x 1-1/2" . 8 #1306-26
25 PlugSeat........ 1 #1306-27
26 O-Ring*......... 1 #1306-28
27 O-Ring*......... 1 #1306-29
28 ResetKnob....... 1 #1306-30
29 Anti-Flood Seat
Assembly
w/BallFloat....... 1 #1306-31
29a Insert.......... 1 (Item29)
29b Seal........... 1 (Item29)
29c Guide.......... 1 (Item29)
29d Ball........... 1 (Item29)
29e Clip........... 1 (Item29)
29f O-Ring*......... 1 #1306-32
FS3452 Fluorosilicone
Grease......... 1.5g#1306-33
............. 2oz.#1306-34
* Requires thin film of
FS3452 Fluorosilicone Grease
OBSOLETE

INSTALLATION
The Model S430 must be installed in accordance with the
following instructions: NOTE
Failure to follow these instructions can result in flooding
of the Accelerator and accidental tripping due to clogging
of its Restriction.
1. The Accelerator must be positioned vertically and
trimmed per the arrangement shown in Figure 3 (Model
A) or 4 (Model A-1), as applicable. Apply pipe thread
sealant sparingly to male threads only.
2. The Strainer located at the Accelerator Inlet must be in-
stalled with its arrow pointed towards the Accelerator.
3. The Check Valve located in the line between the Accel-
erator Outlet and the intermediate chamber of the dry
pipe valve must be installed horizontally with its arrow
pointed in the direction of flow to the intermediate cham-
ber.
4. The connection to the system piping must be located so
that drain back water will not flow into the Accelerator
piping and it must be located at a point above the maxi-
mum expected level of the priming plus drain-back/con-
densate water.
If the connection is made to the riser, it must be located
at least two feet above the level of the dry pipe valve
priming water. Connections to a feed or cross main
must be made either to the side or top of the main.
5. The accelerator/dry pipe valve combination must be in-
stalled in a heated enclosure which is maintained at a
minimum temperature of 40°F/4°C. Heat tracing is not
permitted.
6. Until the S430 is ready to be placed in service, close the
Accelerator Control Valve.
The Accelerator Control Valve must be closed during hy-
drostatic testing of the system in order to prevent flood-
ing of the Accelerator and clogging of the Restriction. Af-
ter the system is hydrostatically tested and drained, the
Accelerator connection to the system must be inde-
pendently drained through the Strainer clean-out plug by
first removing the Strainer clean-out plug and then open-
ing the Accelerator Control Valve to vent the line.
SETTING PROCEDURE
The Accelerator and dry pipe valve must be reset and re-
stored to service as soon as possible after an operation.
Follow the procedure indicated below.
a. Close the main control valve, the air supply control valve
(to the system) and the Accelerator Control Valve.
STAR SPRINKLER INC.
Page 4 2-5.4.10
FIGURE 3
INSTALLATION OF THE MODEL S430 DRY PIPE ACCELERATOR ON MODEL A DRY PIPE VALVES
3
9
ITEM B (REF.)
ITEMSB&29SHOWNINFIG.1OFDATASHEETS
ITEMS REPLACE NIPPLE BETWEEN EXISTING
2-2.1.30 AND 2-2.1.40, AS APPLICABLE.
**
TO SYSTEM PIPING
1/2" NPT CONNECTION
ACCELERATOR
CONTROL VALVE
6
11
4
11
11
RESET
VENT
PLUG
KNOB
ACCELERATOR
MODEL S430
(NORMALLY OPEN)
RIGHT SIDE VIEW REAR VIEW
6 IN. VALVE: 12" (300 mm)
4 IN. VALVE: 10" (250 mm)
VALVE
DRY PIPE
MODEL A
5
11
8
10
6
*
7
7
5
6
13 7
2
1
ITEM 29 (REF.)
12
*
(AT MINIMUM 24" [610 mm]
ABOVE PRIME WATER)
NO. DESCRIPTION..... QTY.PART
1 250 lb. Air Pressure
Gauge ......... 1 #923001005
2 1/2"GlobeValve.... 1 #460471004
3 1/2"Y-Strainer..... 1 #523531005
4 1/2" Swing Check Valve 1 #460491004
5 1/2"Union ....... 2 CH
6 1/2"90°Elbow..... 3 CH
NO. DESCRIPTION.....QTY.PART
7 1/2" x 1-1/2" Nipple . . . 3 CH
8 1/2"Tee.........1 CH
9 1/2" x 1-1/2" Nipple
for4inchValve.....1 CH
1/2" x 2-1/2" Nipple
for6inchValve.....1 CH
NO. DESCRIPTION..... QTY.PART
10 1/2"x7"Nipple .... 1 CH
11 1/2" x 2-1/2" Nipple . . 4 CH
12 1/2" x close Nipple . . . 1 CH
13 1/2"x3"Nipple .... 1 CH
CH: Common Hardware
OBSOLETE

b. Open the Inspector’s Test Connection and then open
the main drain valve as well as all auxiliary (low point)
drains.
c. After the system has been drained, close the Inspector’s
Test Connection and all auxiliary drain valves. Leave
themaindrainvalveopen.
d. Set and prime the dry pipe valve in accordance with the
instructions given in the appropriate Star Product Data
Sheet. Restore normal system air pressure. Leave the
main control valve closed and the main drain valve open.
e. While holding the plunger of the dry pipe valve’s auto-
matic drain valve depressed, open the Accelerator Con-
trol Valve one-quarter turn and allow the water in the Ac-
celerator piping to blow out. After water spray stops
discharging, close the Accelerator Control Valve and
then release the plunger. (This instruction does not ap-
ply when the S430 is being set for the first time, since
the S430 is shipped in the set position. Proceed to Step
‘f’.)
f. Clean out the Strainer at the Accelerator Inlet.
NOTE
A clogged strainer can prevent the Accelerator fromproperly
tripping the dry pipe valve.
g. Slowly remove the Vent Plug located in the front of the
Accelerator Cover and bleed off any residual air pres-
sure in the Differential Chamber.
h. Unscrew (counter-clockwise rotation) the knurled Reset
Knob at the front of the Accelerator until it resists further
turning. A click, which is the sound of the Lever snap-
ping back into the Set Position, may be heard. Screw
the Reset Knob back in until it is finger tight.
NOTE
Do not wrench on the reset Knob. The Reset Knob will turn
with finger torque only.
i. Replace the Vent Plug.
j. Verify that the system air pressure has returned to nor-
mal.
k. Using a watch, note the time for the pressure in the Dif-
ferential Chamber of the Accelerator to increase to 10
psi after the Accelerator Control Valve is opened. The
time should be within the range of values indicated in
Table A for optimum performance of the Accelerator.
NOTE
If the time to pressurize the Differential Chamber to 10 psi is
not within the range of values given in the above table, then
the Accelerator control Valve should be closed and the cor-
rective procedure described in the Maintenance and Service
Section followed.
l. When the air pressure in the Differential Chamber of the
Accelerator is equal to that in the system, then the Accel-
erator is set and ready for service.
m. Close the Accelerator Control Valve and then slowly
open the dry pipe valve’s priming test valve, to bleed off
any excess water above the priming level. Reclose the
STAR SPRINKLER INC.
2-5.4.10 Page 5
FIGURE 4
INSTALLATION OF THE MODEL S430 DRY PIPE ACCELERATOR ON MODEL A-1 DRY PIPE VALVES
NO. DESCRIPTION..... QTY.PART
1 250 lb. Air Pressure
Gauge ......... 1 #923001005
2 1/2"GlobeValve.... 1 #460471004
3 1/2"Y-Strainer..... 1 #523531005
4 1/2" Swing Check Valve 1 #460491004
NO. DESCRIPTION.....QTY.PART
5 1/2"Union........2 CH
6 1/2"90°Elbow .....3 CH
7 1/2" x 1-1/2" Nipple . . . 3 CH
8 1/2" x 2-1/2" Nipple . . . 4 CH
6
6
5
8
8
4
8
8
7
5
7
1
REAR VIEWRIGHT SIDE VIEW
RESET
VENT
PLUG
KNOB
(381.0 mm)
15"
2
7
ACCELERATOR
MODEL S430
39
4 IN. VALVE: 13-1/4" (336.6 mm)
6 IN. VALVE: 14" (355.6 mm)
MODEL A-1
DRY PIPE
VALVE
TRIM CONNECTION
TO DRY PIPE VALVE
INTERMEDIATE
CHAMBER
1/2" NPT
ACCELERATOR
TO SYSTEM PIPING
1/2" NPT CONNECTION
ACCELERATOR
CONTROL VALVE
(NORMALLY OPEN)
(AT MINIMUM 24" [610 mm]
ABOVE PRIME WATER)
6
10
NO. DESCRIPTION..... QTY.PART
9 1/2"x3"Nipple .... 1 CH
10 1/2"x7"Nipple .... 1 CH
CH: Common Hardware
OBSOLETE

priming test valve, return system pressure to its normal
value, and then re-open the Accelerator Control Valve.
n. Slowly open the main control valve. Close the main
drain valve as soon as water discharges from the drain
connection, and then completely open the main control
valve. The fire protection system is now ready for serv-
ice. NOTE
After placing a fire protection system in service, notify the
proper authorities and advise those responsible for moni-
toring proprietary and/or central station alarms.
MAINTENANCE AND SERVICE
The Model S430 must be maintained and serviced in ac-
cordance with the following instructions:
NOTE
If an Accelerator is to be temporarily taken out of service,
then the proper authorities and all personnel who may be
affected must be notified.
Before performing an alarm test, notify the proper authori-
ties and all personnel who may be affected.
Before closing a fire protection system main control valve
for inspection or maintenance work on the fire protection
system which it controls, permission to shut down the af-
fected fire protection system must be obtained from the
proper authorities and all personnel who may be affected
by this action must be notified.
The Model S430 Accelerator does not require any regu-
larly scheduled maintenance. It is recommended, how-
ever, that its proper operation and condition be peri-
odically verified in accordance with the following
described Accelerator and System Inspection Proce-
dures.Any impairment must be immediately corrected (re-
fer to the Troubleshooting Section, as applicable).
It is recommended that automatic sprinkler systems be in-
spected by a qualified Inspection Service.
Accelerator Inspection Procedure
It is recommended that the following Accelerator inspec-
tion procedure be performed at least annually, preferably
in the fall or winter of the year.This procedure must also
be used whenever flooding the system would expose the
water to freezing conditions.
1. Verify that the Reset Knob is screwed in.
2. Close the system’s main control valve and open the
main drain valve to relieve the supply pressure to the
dry pipe valve.
3. Verify that the Accelerator Control Valve is open.
4. Open the Inspector’s Test Connection. Verify that the
time to Accelerator trip is essentially the same as in pre-
vious tests. A momentary burst of air from the Automatic
Drain Valve indicates that the Accelerator has tripped.
NOTE
As the system pressure is decreasing, check for any sign of
water being discharged from the Accelerator Relief Port.
5. Depress the plunger of the Automatic Drain Valve. A
steady stream of exhausting air indicates that the Accel-
erator has properly latched in the Tripped position.
6. Close the Accelerator Control Valve and the Inspector’s
Test Connection.
7. Clean out the Strainer at the Accelerator inlet.
NOTE
A clogged strainer can prevent the Accelerator fromproperly
tripping the dry pipe valve.
8. Reset the Accelerator in accordance with Steps ‘g’
through ‘n’ of the Setting Procedure Section.
System Inspection Procedure
It is recommended that the following Accelerator and dry
pipe valve inspection procedure be performed at least an-
nually, preferably in the spring or summer of the year.
This procedure can only be used whenever there is no
danger that flooding the system will expose the water to
freezing conditions.
1. Verify that the Reset Knob is screwed in.
2. Open the Inspector’s Test Connection. Verify that trip-
ping of the Accelerator operates the dry pipe valve and
that water is delivered out of the Inspector’s Test con-
nection within the elapsed time required by the authority
having jurisdiction. A maximum of 60 seconds (from the
time that the Inspector’s Test Connection is opened) is
recommended. NOTE
As the system pressure is decreasing, check for any sign of
water being discharged from the Accelerator Relief Port.
3. Reset the Accelerator and dry pipe valve in accordance
with the Setting Procedure Section.
TROUBLE SHOOTING
Refer to the following subsections, as applicable.If the
designated instructions do not remedy the particular prob-
lem, refer to the Accelerator Disassembly and Reassem-
bly subsection.
Water Discharge From Accelerator Relief Port
Use the following instructions if water is discharged from
the Accelerator Relief Port during a trip.
1. Verify that the connection from the Accelerator to the
system piping is installed in accordance with Instruction
No. 4 of the Installation Section. Correct if necessary.
2. Investigate for and correct any condition which could re-
sult in an excessive build up of drain-back and/or con-
densate water.
3. Review procedures which were used to set the Accelera-
STAR SPRINKLER INC.
Page 6 2-5.4.10
System Air Time to 10 psi, sec.
Pressure, psi Minimum Maximum
20 24 160
25 18 116
30 15 92
40 10 60
50 8 48
60 6 36
TABLE A
DIFFERENTIAL CHAMBER FILL TIMES TO 10 PSI
OBSOLETE

tor. Failure to perform Step ‘e’ of the Setting Procedure
can permit a small amount of water to enter the Pilot
Chamber of the Accelerator.
Slow Fill of Differential Chamber
Use the following instructions if the time to fill the Differen-
tial Chamber is longer than the maximum value indicated
in Step ‘k’of the Setting Procedure Section.
1. Check to see that the Accelerator was reset per Step ‘h’
of the Setting Procedure Section.
2. Close the system’s main control valve and open the
main drain valve.
3. Check for any sign of external leakage past the Accel-
erator Pressure Gauge, Vent, and Restriction Access
Plug connections.
4. Check for any sign of external leakage past the Reset
Knob and Cover Gasket.
5. Close the Accelerator Control Valve.
6. Gently insert a 3/32 inch or smaller diameter probe into
the Relief Port. If the probe can be inserted more than
1/4 inch then the Lever has not reset and the Accelera-
tor must be disassembled for internal inspection. See
the instructions for Accelerator Disassembly and Reas-
sembly.
7. Slowly remove the Accelerator Vent Plug to bleed all
pressure from the Differential Chamber and then slowly
remove the Restriction Access Plug to bleed all pres-
sure from the Pilot Chamber.
8. Replace the Restriction and then the Restriction Access
Plug.
9. Place the fire protection system back in service in ac-
cordance with Steps ‘i’ through ‘n’ of the Setting Proce-
dure Section.
Unexplained Accelerator Trip
Use the following instructions if there is an unexplained
accidental trip of the Accelerator.
1. Verify that the connection from the Accelerator to the
system piping is installed in accordance with Instruction
No. 4 of the Installation Section. Correct if necessary.
2. Verify the time to fill the Differential Chamber as de-
scribed in Step ‘k’ of the Setting Procedure Section. If
the time to fill the Differential Chamber to 10 psi is
longer than the maximum indicated value, then follow
the instructions given under “Slow Fill of Differential
Chamber”.
3. If the time to fill the Differential Chamber is within the in-
dicated range of values, then investigate for and correct
any condition which could result in excessive leakage of
system air pressure.
Fast Fill of Differential Chamber or Long Time to Ac-
celerator Trip
Use the following instructions if the time to fill the Differen-
tial Chamber is shorter than the minimum value indicated
in Step ‘k’of the Setting Procedure Section.This proce-
dure should also be followed if the time to Accelerator trip
(following opening of the Inspector’s Test Connection) is
significantly longer than expected.
1. Close the system’s main control valve and open the
main drain valve.
2. Close the Accelerator Control Valve.
3. Slowly remove the Accelerator Vent Plug to bleed all
pressure from the Differential Chamber and then slowly
remove the Restriction Access Plug to bleed all pres-
sure from the Pilot Chamber.
4. Using a slotted screwdriver, check the tightness of the
Restriction.
5. Inspect the Restriction’s O-ring seal. The O-ring must be
replaced if there are any signs of nicks, cuts, or deterio-
ration due to age. Replace the Restriction after cleaning
and lubricating its O-ring with a non-petroleum based
grease (such as Dow Corning FS3452). Replace the
Vent Plug and Restriction Access Plug.
6. If the Restriction and its O-ring are found to be in good
condition, then it is likely that there is leakage past the
Plunger. Remove the Cover from the Base. Check that
the six screws securing the Upper Diaphragm Plate to
the Cover are tight.
Inspect the Upper Diaphragm for any sign of cracks, pin
holes or deterioration due to age. Replace the Plunger if
there is any possibility of leakage past the Upper Dia-
phragm.
7. Reassemble the Accelerator and place the fire protec-
tion system back in service in accordance with Steps ‘j’
through ‘n’ of the Setting Procedure Section.
Air Leakage Out Automatic Drain
If there is leakage of air out the Automatic Drain of the
dry pipe valve, after the Accelerator and dry pipe valve
have been placed in service, then it will be necessary to
first determine whether the leakage is past the Accelera-
tor or the dry pipe valve.
Close the Accelerator Control Valve.Slowly remove the
Accelerator Vent Plug to bleed all pressure from the Differ-
ential Chamber and then slowly remove the Restriction
Access Plug to bleed all pressure from the Pilot Chamber.
If leakage out the Automatic Drain persists then refer to
the dry pipe valve Technical Data Sheet for maintenance
instructions.If leakage out of the Automatic Drain stops,
then the Accelerator will have to be taken out of service
and the Accelerator Plug Seat removed for cleaning of
the seat and the lower O-ring area on the Exhaust Valve.
Accelerator Disassembly and Reassembly
(For Internal Inspection As Necessary)
1. Close the system’s main control valve and open the
main drain valve.
2. Close the Accelerator Control Valve.
3. Slowly remove the Accelerator Vent Plug to bleed all
pressure from the Differential Chamber and then slowly
remove the Restriction Access Plug to bleed all pres-
sure from the Pilot Chamber.
4. Break the union connections at the Inlet and Outlet of
the Accelerator and remove it from the line. Plug the
connection to the intermediate chamber of the dry pipe
valve and place the fire protection system in service
while the Accelerator is out for maintenance.
STAR SPRINKLER INC.
2-5.4.10 Page 7
OBSOLETE

5. Remove the eight screws holding the Cover to the Base
and remove the Cover.
6. Remove the six screws holding the Upper Diaphragm
Plate to the Cover. Remove the Plunger and inspect the
Upper Diaphragm to ensure that it is flexible and free
from physical damage or deterioration due to age.
Check the Jam Nut to ensure that it is assembled tightly
to its Screw. Remount the Plunger and Upper Dia-
phragm Plate taking care to cross-tighten the screws uni-
formly.
7. Replace the Restriction if it has been wetted. Clean and
lubricate the Restriction O-ring seal with a non-petro-
leum based grease (such as Dow Corning FS3452).
Replace the Vent Plug and Restriction Access Plug.
8. Remove the Retaining Ring from the Upper Plug portion
of the Exhaust Valve. Remove the four screws holding
the Pivot Plate. Remove the sub-assembly of the Lever
and Pivot Plate, the Exhaust Valve, the Anti-Flood Valve
and the Relief Valve.
9. Inspect the Lower Diaphragm to ensure that it is flexible
and free from physical damage or deterioration due to
age.
10. Check to see that the Exhaust Valve components are se-
curely assembled together. Only tighten by gripping the
flats using an open end type wrench.
11. Inspect the O-ring on the Lower Plug. It must be re-
placed if there are any signs of nicks, cuts or deteriora-
tion.
12. Inspect the Relief and Anti-Flood Valves. If either is bent
or nicked it must be replaced.
13. Remove and inspect the Latch. The catch leaf should ex-
tend 5/16 to 3/8 inches in the free state.
14. Remove the Relief Valve Seat. Remove the O-ring and
Seal Washer. Carefully clean the O-ring and Seal
Washer seating surfaces in the valve seat and Accelera-
tor Base. If the O-ring or Seal Washer is nicked, cut, or
shows signs of deterioration, it must be replaced.
15. Replace the Seal Washer in the Accelerator Base. Ap-
ply a thin film of Dow Corning FS3452 Fluorosilicone
Grease to the valve seat. Place the O-ring in its seat
(the lubricant will hold it in place) and then thread the Re-
lief Valve Seat into the Body with 10 to 15 ft.lbs. of
torque.
16. Remove the Anti-Flood Seat Assembly w/Ball Float.
Check for damaged parts and for freedom of Ball move-
ment. If parts are damaged or inoperative, the Assembly
must be replaced.
17. After checking the Anti-Flood Seat Assembly w/Ball
Float, lubricate the O-ring with a thin film of Dow Corn-
ing FS3452 Fluorosilicone Grease, and thread the As-
sembly into the Body with 10 to 15 ft.lbs. of torque.
18. Remove the Reset Knob. Carefully clean the O-ring and
its seating surface. If the O-ring is cut, nicked, or shows
signs of deterioration it must be replaced. Lubricate the
O-ring with a thin film of Dow Corning FS3452 Fluorosili-
cone Grease.
19. Reassemble the Accelerator in the following order.
a. Thread the Reset Knob into the Base finger tight.
b. Set the Anti-Flood Valve (with Retaining Ring in
place) and the Compression Spring into their seat.
c. Set the Exhaust Valve in place.
d. Slide the Relief Valve into the slot at the end of the
Lever and then remount the sub-assembly of the
Lever and Pivot Plate in the Base, taking care to
cross-tighten the screws uniformly.
e. Replace the Retaining Ring on the Upper Plug.
f. Push the Anti-Flood Valve end of the Lever down
and release it twice to assure that there is no bind-
ing.
g. Replace the Latch making sure that the notch in
the bottom straddles the Reset Knob and that the
tabs at the top are seated in the Base.Place the
Lever in the Tripped (latched) position.
h. Place the Cover upside down. Set the Cover Gas-
ket in place and then push all eight screws through
the Gasket to assist in assembling the Cover to the
Base.
i. Align the Cover with the Base and tighten all of the
screws uniformly.
j. Replace the Vent Plug and the Restriction Access
Plug.
k. Reinstall the Accelerator and return the system to
service in accordance with the Setting Procedure
Section.
ORDERING PROCEDURE
Please Specify:
1 Model S430 Dry Pipe Valve Accelerator (#1306)
2. Model S430 Dry Pipe Valve Accelerator Trim
For 4 and 6 Inch Model A or A-1
Dry Pipe Valves (#1306-01)
Refer to Price List for for complete listing of Part
Numbers with respect to trim finish, replacement parts,
etc.
AVAILABILITY AND SERVICE
Star Sprinkler Inc. products and devices are available
worldwide through a network of independent distributors.
Please contact Star Sprinkler Inc.for information and the
name and address of the Star distributor in your area.
LIMITED WARRANTY
Seller warrants for a period of one year from date of ship-
ment (warranty period) that the products furnished here-
under will be free of defects in material and workmanship.
For further details on Warranty, contact Star Sprinkler, Inc.
7071 S. 13th Street • Suite 103
Oak Creek, WI 53154
414-570-5000 • 800-558-5236 PRINTED IN U.S.A. 2-00
STAR SPRINKLER INC.
Page 8 2-5.4.10
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