Series 756 FireLock
®
European Dry Valve Stations
8
RECOMMENDED AIR PRESSURES FOR SERIES 756
DRY VALVES WITH SERIES 753-A DRY ACTUATORS
(INSTALLED WITH OR WITHOUT SERIES 746 DRY
ACCELERATORS)
NOTES:
1.
The recommended air pressures, shown in the chart
above, apply to dry valves that contain a Series 753-A Dry
Actuator.
2.
The Victaulic air regulator is a relief-type design. Any pres-
sure in the system that is above the set point of the regulator will
be released. Therefore, charging the regulator above the set
point could cause premature operation of a valve installed with
a Series 746 Dry Accelerator.
3.
For base or riser-mounted compressors, the recommend-
ed air pressures are the “on” or “low” pressure settings for the
compressor.
4.
For tank-mounted compressors, the recommended air
pressures are the set point for the air regulator. The “on” pres-
sure of the compressor should be at least 0,3 Bar above the set
point of the regulator.
5.
These pressures involve an 8-to-1 water-to-air ratio, plus a
0,7-Bar safety factor.
EXAMPLE:
For a system with an underground pressure of 5,5
Bar:
Per the chart above, the pressure should be set at 1,4-Bar. In ad-
dition, this pressure could be calculated by dividing the sys-
tem’s maximum water pressure by 8 and then adding 0,7 Bar.
Victaulic Air Maintenance Trim Assembly (AMTA)
COMPRESSOR AND AIR MAINTENANCE TRIM
REQUIREMENTS
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
10
11
12
13
14
15
16
3
4
1
2
5
6
7
8
9
MAXIMUM WATER SUPPLY PRESSURE - BAR (PEAK)
AIR PRESSURE - BAR
BILL OF MATERIALS
Item
Description
1
¹⁄₁₆
-inch Restrictor
2
Slow Fill Ball Valve
3
Air Regulator
4
Strainer (100 Mesh)
5
Spring-Loaded, Soft-Seated Check Valve
6
Fast Fill Ball Valve
NOTICE
• In the event a compressor becomes inoperative, a properly sized tank-
mounted compressor provides the greatest protection for systems contain-
ing a Series 746 Dry Accelerator. In this situation, air can be supplied con-
tinuously to the sprinkler system for an extended time period.
• If multiple dry valves are installed with a common air supply, isolate the
systems by using a spring-loaded, soft-seated check valve to ensure air
integrity for each system.
• Good practice is to include a control valve for isolation and service of each
individual system.
1
6
5
4
2
3
COMPRESSOR REQUIREMENTS
0
20
40
60
80
100
120
140
160
150
400
650
900 1150 1400 1650 1900 2150 2400 2650 2900 3150 3400 3650 3900 4150 4400 4650 4900 5150 540
5650 5900 6150 6400 6650
0
System Capacity (liters)
Required Flow Rate (lpm)
0,9-Bar System Air
1,4-Bar System Air
2,8-Bar System Air
3,8 Bar System Air
