Deluge Valve
| A Deluge Valve is known as a system control valve in a deluge system, which is used for fast application of water in a spray system. They are used to protect areas such as power transformer installation, storage tank, conveyor protection etc. with the addition of foaming agent they do protect aircraft hangar and inflammable liquid fire. |  |
Deluge Valve Operation
LIFECO Deluge Valve is a quick release, hydraulically operated diaphragm actuated type of valve. It has three chambers, isolated from each other by the diaphragm operated clapper and seat seal. While in SET position, water pressure is transmitted through an external bypass check valve and restriction orifice from the system supply side to the top chamber, so that supply pressure in the top chamber act across the diaphragm operated clapper which holds the seat against the inlet supply pressure because of the 2 : 1 differential pressure design. On detection of fire the top chamber is vented to atmosphere through the outlet port via opened actuation devices. The top chamber pressure cannot be replenished through the restricted inlet port, thus it reaches less than half the supply pressure instantaneously and the upward force of the supply pressure lift the clapper allowing water to enter the system piping network and alarm devices.
Trim Description
a-) BASIC TRIM -
The basic trim is required on all LIFECO Deluge valve regardless of release system. It contains those components which are required in all types of installation, such as the main drain valve, priming connection, drip check valve, emergency release valve and pressure gauges.
b-) DRY PILOT TRIM (PNEUMATIC RELEASE) -
Dry pilot operation uses a pilot line of closed Sprinkler/QB detector containing air under pressure, located in the area to be protected. It requires regulated dry air supply with main supply point through restricted orifice. The pilot line is connected directly on the top of Positive Drain Actuator (PDA). The bottom of PDA is connected to the top chamber of the deluge valve.
ELECTRIC & HYDRAULIC RELEASE TRIM - SCHEMATIC DELUGE VALVE MODEL - A SIZE 200 / 150 / 100 / 80 / 50 NB
| When the air pressure drop, due to release of any of the release devices on detection of fire, the diaphragm of PDA is lifted and allows the water to drain. This reduces the water pressure in the top chamber of the deluge valve and when the pressure in the top chamber of the deluge valve and when the pressure in the top chamber reaches 50% of the supply pressure of the deluge valve opens. The direct drain of PDA start when the top chamber pressure of deluge valve reaches approximately 0.5 Kg/sq.cm. This positive drain will not permit the deluge valve to close unless the PDA is set manually. The recommended air supply pressure is as per TABLE- |  |
| LINE WATER PRESSURE Kg./Sq. Cm. MAXIMUM | AIR PRESSURE IN DETECTION LINE Kg./Sq. Cm. |
| MINIMUM | |
| 2 | 1.5 |
| 4 | 2.0 |
| 6 | 2.5 |
| 8 | 3.0 |
| 10 | 3.5 |
| 12 | 3.5 |
c-) WET PILOT TRIM (HYDRAULIC RELEASE) -
Wet pilot operation uses a pilot line of closed sprinklers containing pressurized water, supplied through the upstream side of the deluge valve, through a restricted orifice. All the release lines are connected to a common release line. Due to release of any one of the release device, the water pressure in the top chamber of the deluge valve reaches 50% of the supply pressure, the deluge valve opens.
d-) ELECTRIC RELEASE TRIM -
to actuate a deluge valve electrically, a solenoid valve is provided to drain the water from the top chamber of the deluge valve. A pressure switch is provided to activate an electric alarm, to shut down the desired equipment or to give “Tripped” indication to the deluge valve. In addition to this a pressure switch can also monitor “Low air pressure” and “Fire condition” when used in dry pilot air line.
e-) TEST AND ALARM TRIM WITH SPRINKLER ALARM -
This trim is supplied with the sprinkler alarm bell, which bells on actuation of the deluge valve. A test valve is provided to test the normal operation of the sprinkler alarm bell.
The next step
For more information about Deluge Valves, either email the sales team or call +44 (0) 870 066 4401.
