» Low Voltage Power Supply and Override Control for Solenoid Water Valves : VLX

The VLX Valve Control Unit is normally used in conjunction with an AQUALEAK Water Leak Detection system where there is a requirement to shut off the water supply when a water leak is detected. The Water Detection Unit is fitted with an alarm relay which provides the signalling output to the VLX. The VLX is connected to mains power supply and converts mains power to safe low voltage power which operates the solenoid valve in the water supply pipe. The Valve would be 24VAC and under normal operation would be held ‘powered open’ via the alarm relay of the Water Detection Unit. When water is detected the relay operates, power is taken off the valve, and the valve immediately closes under spring pressure, turning off the water.

The valve will remain shut and will be held shut following the detection of a leak until such time as the Sensor zone dries out. In view that repairs or clearing of an alarm could take some time, the VLX Unit is provided with a Valve Key Switch Override System to allow manual reset of the valve. Should the leak be considered not to be a problem, and if the situation is under control, turning the key to the ‘Override’ position would allow the water to be turned on again even if the Water Detection System is still in ‘alarm’ and ‘holding’ the valve closed. The switch can also be used under ‘normal’ operating conditions to turn the water off.

The VLX type Valve Control Unit can also be used as a stand-alone controller for automatic timed water shutoff when the premises are empty. The operation would be the same as for the water detection application, except that a Timer would take the place the Relay. The VLX-T Unit would automatically shut off the water when the premises close for the night and then automatically switch the water back on again before the premises open in the morning. The timer allows for one or more shut-off periods during a 24 hour period, and allows for separate adjustable shut-offs for the weekend period. Should water be required during any shut-off period, it is simply a case of turning the Key Switch Override System to ‘on’ to get water flowing, and then switching it to ‘off’ to return to the automatic shut-off periods. The VLX Unit is fitted as standard with an output signalling relay which could advise a remote BMS System, or other alarm systems, that the water has been switched off, or on.