| 摘要 |
<p>A valve for regulating the through-flow of a fluid from an inlet (10) to an outlet (11), especially for regulating a gas flow from a place (4) with a higher pressure than the ambient pressure, the valve (2) being arranged to be opened by an operating means (22) which is mechanically coupled to a means sensing the pressure at said place (4). The valve comprises a piston (7) which is slidable in a piston guide (8), a sealing seat (12) for the piston (7) being provided at the end of the piston guide (8) facing away from the place (4) with higher pressure. The other end (14) of the piston guide (8) is closed and together with an adjacent end face (15) of the piston (7) define a chamber (16). A pressure equalizing channel (17) is provided between the chamber (16) and the outlet side (11) of the valve, and a control valve (18, 19) is arranged to close and open the pressure equalizing channel (17) by means of said operating means (22) which is arranged to move the piston (7) away from its seat (12) only after having opened the control valve (18, 19).</p> |
