Patent ID: 7395868

Claim:
In apparatus of a spray head for blocking a medium flow passage in the spray head, the improvements comprising: a blocking element ( 1 ) arranged in the passage and, when unbroken, blocking the passage of medium flow from a first side of the blocking element to a second side of the blocking element, on the first side of which blocking element a first pressure(p 1 ) prevails in the medium flow passage ( 2 ) while on the second side a second pressure (p 2 ) prevails in a passage ( 3 ), said blocking element ( 1 ) being arranged to be ruptured so that another medium flow passage is formed through the blocking element by a pressure difference between the first and the second sides of the blocking element of a preset value; and a supporting element ( 4 ) at least on the second side of the blocking element where the pressure of the medium is lower at least just before the instant of rupture of the blocking element, which supporting element can be moved between a first position where the supporting element supports the blocking element ( 1 ) so that the blocking element cannot be ruptured even if the pressure difference in the passage between the first and the second sides of the blocking element is greater than the preset value, and a second position where the supporting element does not support the blocking element, characterized in that the apparatus comprises means for applying and adjusting a supporting force to the blocking element.