| 摘要 |
<p>1. Safety valve for means which are to be actuated pneumatically or hydraulically and which, in the event of a fire, ha to be brought into a predetermined state or position or have to be held in a predetermined position, more especially for fireproof doors, with an inlet (1; 24) and an outlet (18; 45) for the working or operating fluid, a valve seat (20; 46) which is arranged between these and on to which a valve element (2, 4; 26, 41) movable between a sealing position and an opening position is able to be brought to provide a sealing effect, and also with a pressure-release opening (17; 44) which, with the valve element (2, 4; 26, 41) disposed in the sealing position, is connected to the outlet (18; 45) and, with the valve element (2, 4; 26, 41) disposed in the open position, is sealed off with respect to the inlet (1; 24) and the outlet (18; 45), characterised in that that surface of the valve element (2, 4; 26, 41) which is adjacent to the valve seat (20; 46) and to be triggered with operating fluid from the inlet (1; 24) is smaller than the surface which is further from the valve seat (20; 46) and is to be acted upon with operating fluid through the valve element (2, 4; 26, 41) from the inlet (1; 24), which surface partially defines a control cavity (22, 48) receiving operating fluid, that the control cavity (22, 48) is further limited by an insert (12, 36) which comprises a through-flow bore (23, 39) opening at its inner end into the control cavity (22; 48), the cross-section of the said bore being substantially larger that the minimal cross-section of the connection (14; 27) between inlet (1, 24) and that surface of the valve element (2, 4; 26, 41) which is further from the valve seat (20; 46) and that the through bore (23; 39) is sealed at its outer end with the aid of a release element (8; 35) which is destructible by heat.</p> |
