Service
Manual | 34. Inlet Valve, Water |
3 8911 1 34
Type Edition Page
Data
Capacity at 300 kPa | 300 litres/min |
Operating limits |
Description
The valve is electromagnetically operated and has a rubber diaphragm as its opening and closing element. The valve utilises the water pressure when opening and closing.
When the electromagnetic is
The water pressure acts through the pilot pressure opening on the top of the rubber diaphragm. Because the water pressure is acting on a relatively larger area on the top of the diaphragm than on the bottom (part of the underside of the daphragm is in contact with the outlet of the valve, where there is no prssure) the water pressure from below is insufficient to lift the diaphragm, so that the diaphragm forms a seal against the valve seat.
When the magnet is energised, the opening from the top of the diaphragm to the outlet of the valve is opened. Since the diameter of this opening is greater than that of the pilot opening, the diameter of which is limited by the balancing nozzle, the pressure on the top of the diaphragm falls. The water pressure on the bottom of the diapragm can then lift the diaphragm and open the valve.
CoilArmature
Compres- 
sion
spring
Diaphragm
Balancing nozzle
Outlet
Inlet | Valve body |
1364
|
| Coil |
Rubber diaphragm | Compression Spring | Armature |
|
| |
Balancing |
|
|
nozzle |
|
|
Pilot pressure duct |
| Duct to valve outlet |
