Technical Data; Physical Characteristics; Operating Principles - Tyco DPV-1 Manual

TFP1486
Page 2 of 18
Water Supply System Air
Pressure, Pressure Range,
bar
1,4
4,1 1,0 - 1,6
5,5 1,4 - 1,9
6,9 1,7 - 2,3
8,3 2,1 - 2,6
10,0 2,4 - 3,0
11,4 2,8 - 3,3
12,8 3,1 - 3,7
14,1 3,4 - 4,0
15,5 3,8 - 4,3
16,0 4,1 - 4,6
TABLE A
SYSTEM AIR PRESSURE
REQUIREMENTS
Technical
Data
Approvals
VdS Approved – DN100 and DN150 *
(may be installed in accordance with
EN12845)
* DN65 and DN80 available upon
request, without Approval
For more information on agency
approvals, contact Johnson Controls
at the following office:
Kopersteden 1
7547 TJ Enschede
The Netherlands
Tel: +31-(0)53-428-4444
Fax: +31-(0)53-428-3377
Dry Pipe Valve
TYCO Model DPV-1 Preaction Type B
Valves are for vertical installations (flow
going up), and they are rated for use at
a maximum service pressure of 16 bar
(VdS Approval range of supply pressure
is 3 to 16 bar). The nominal pressure
loss versus flow is shown in Figure 11,
and the valve installation dimensions
are shown in Figure 9.
Flanged connections are drilled per
ISO 2084 (PN10/16). The grooved
outlet connections, as applicable, are
cut in accordance with standard groove
specifications for steel pipe. They are
suitable for use with grooved end pipe
couplings that are listed or approved
for fire protection system service.

Physical Characteristics

Valve Body . . . . . . . . . . . . . . . .Ductile Iron
Handhole Cover . . . . . . . . . . . .Ductile Iron
bar
Handhole Cover Gasket. . . . . . . Neoprene
Handhole Cover
0,7
Fasteners . . . . . . . . . . . . . . . Carbon Steel
Clapper Facing. . . . . . . . . . . . . . . . . EPDM
Air/Water Seat Ring . . . . . . . . . . . . . Brass
Clapper. . . . . . . . . . . . . . . . . . . . . . Copper
Clapper Retaining Plate . . . . . . . . . Bronze
Latch . . . . . . . . . . . . . . . . . . . . . . . Bronze
Hinge Pin . . . . . . . . . . . .Aluminum Bronze
Components of the Model DPV-1 Pre-
action Type B Valve are shown in Figure
2.
Valve Trim
The Valve Trim is illustrated in Figures 7,
8, and 10. The Valve Trim forms a part
of the laboratory approval of the Model
DPV-1 Preaction Type B Valve for use in
Preaction Type B Systems and is nec-
essary for the proper operation of the
Model DPV-1 Preaction Type B Valve.
Each package of trim includes the fol-
lowing items:
• Water Supply Pressure Gauge
• System Air Pressure Gauge
• Main Drain Valve
• Low Body Drain Valve
• Alarm Test Valve
• Automatic Drain Valve
• Dry Pipe Valve Accelerator
• Solenoid Valve
Air Supply
Table A shows the system air pres-
sure requirements as a function of the
water supply pressure. The air (or nitro-
gen) pressure in the sprinkler system
is recommended to be automatically
maintained by using one of the follow-
ing pressure maintenance devices, as
appropriate:
• Model AMD-1
Air Maintenance Device
(pressure reducing type)
Refer to TFP1221.
• Model AMD-2
Air Maintenance Device
(compressor control type)
Refer to TFP1231.
• Model AMD-3
Nitrogen Maintenance Device
(high pressure reducing type)
Refer to TFP1241.
Operating
Principles
Dry Pipe Valve
The TYCO Model DPV-1 Preaction Type
B Valve is a differential type valve that
utilizes a substantially lower system (air
or nitrogen) pressure than the supply
(water) pressure, to maintain the set
position shown in Figure 3A. The differ-
ential nature of the Model DPV-1 Preac-
tion Type B Valve is based on the area
difference between the air seat and the
water seat in combination with the ratio
of the radial difference from the Hinge
Pin to the center of the Water Seat and
the Hinge Pin to the center of the Air
Seat. The difference is such that the
Model DPV-1 Preaction Type B Valve
has a nominal trip ratio of 5,5:1 (water
to air).
Table A establishes the minimum
required system air pressure that
includes a safety factor to help prevent
false operations that occur due to water
supply fluctuations.
The Intermediate Chamber of the
Model DPV-1 Preaction Type B Valve
is formed by the area between the
Air Seat and Water Seat as shown in
Figure 3B. The Intermediate Chamber
normally remains at atmospheric pres-
sure through the Alarm Port connection
and the valve trim to the normally open
Automatic Drain Valve (Ref. Figures
1 and 10). Having the Intermediate
Chamber, Figure 3B, open to atmo-
sphere is critical to the Model DPV-1
Preaction Type B Valve remaining set,
otherwise the full resulting pressure of
the system air pressure on top of the
Clapper Assembly cannot be realized.
For example, if the system air pres-
sure is 1,7 bar and there was 1,0 bar
pressure trapped in the Intermediate
Chamber, the resulting pressure across
the top of the Clapper would only be
0,7 bar. This pressure would be insuf-
ficient to hold the Clapper Assembly
closed against a water supply pres-
sure of 6,9 bar.
The Dry Pipe Valve is automatically
operated by one of two means: opera-
tion by a fire detection device, or oper-
ation by the opening of one or more
sprinklers.