Safety valve unit for unit working with pressure means

摘要

The unit has pressure means inlet and outlet chambers (24,17) which can be connected together via a main valve (22,21) having a valve seat (22) and valve closing member. A spring (18) holds the main valve closing member in an end position. An additional auxiliary valve (10,11) is provided for connecting the pressure means outlet chamber (17) to a pressure means sink. The auxiliary valve includes a valve seat (10) and an auxiliary valve-closing member (11). The auxiliary closing member is held in a first position by the spring to close the auxiliary valve, and is extended from its first end position to a second end position in which the valve is open when the force of the main closing member overcomes that of the spring. The auxiliary closing member is built to be elastically deformable and is in working connection with the closing member of the main valve via an activation member.