The valve body and all other metallic parts are made off brass. The sealing gaskets are of rubber adequate to its working conditions. All springs are of stainless steel.
These valves can realise three primary functions.

1. The safety valve "A" opens the passage "1" for the outflow of water when the pressure in the tank increase over its permissible limit.
2. The check valve "B" for filling the heater with water. It also prevents the outflow of water from the tank back into the supply line in case of pressure failure.
3. The return valve "C" opens the outflow of water from the tank into the supply line in case of an excessive pressure rise in the tank exceeding supply line pressure. It makes possible to decrease the pressure in the tank without uptake of hot water from it.

• turn the hood "2" clockwise or counter-clockwise up to top position,
• observe if water is flowing out of the passage "1". The water should flow,
• turn the hood "2" to its down position.

These valves should be installed in the water supply line of the heater. The direction of flow should be in accordance with the arrow marked on the valve body with the passage "1" downwards. The water supplying line should be stable to 90°C temperature at least 5m before heater. Max. length of engagement of a pipe into the valve is 9 mm. It is possible to connect the flexible pipe to passage "1" for discharge of flowing water. This pipe should have inside diameter 9 mm, max. lengt 1,2 m and must be stable to 80'C temperature. After mounting the pipe should be protected against choking. The water supplying pressure cannot exceed the nominal pressure to avoi  discharge of water from the heater.

The ZB-4 safety valves are designed for protection against too high water pressure on electrical water heaters. Available are valves for 0,6 MPa and 0,7 MPa nominal pressure.

  specification ZB-4 0371 format pdf - pobierz

  specification ZB-4 0376 format pdf - pobierz

 instruction regarding the codification of the safety valves pdf format - download