Hydraulic safety valve in the drain
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The hydraulic safety valve for The 1 ½'' drain is especially suitable for installation on the drain outlet of an automatic selector valve of a swimming pool sand filter.
Its use prevents water loss when the valve changes working position and in the event of a power failure and the valve is left in a position where the pool could be emptied.
Technical specifications:
- Two connection options: double smooth sleeve Ø50 and double threaded sleeve 1 ½".
- Working pressure range: 0.2 to 3 kg/cm2.
- Flow rate range: between 0.5 m3/h and 14 m3/h.
Electrical characteristics of the solenoid:
- Voltage: 24 Vac.
- Consumption: 0.125 A.
Operating principle:
This is a hydraulically operated valve in which an elastic diaphragm closes off the water flow. The larger cross-section of the upper chamber compared to the fluid passage causes the valve to remain closed when there is upstream fluid pressure, as the 3-way solenoid connects the pressure from the pump to the upper chamber of the valve. When the drain of the upper chamber is opened, either automatically by a signal from the selector valve or manually by the solenoid selector, fluid access to the upper chamber is blocked, and therefore the fluid in the line overcomes the diaphragm, causing the valve to open.
