| 摘要 |
<p>Damping device for a check valve in a pipeline traversible by a liquid, the check valve having a closure member movable by flow of the liquid into a position wherein it lies on a valve seat in the pipeline so as to close the valve, the damping device including at least two parts of which a first part is a cylinder and a second part a piston reciprocatingly received in the cylinder, one of the first and second parts being connected to the closure member and the other of the first and second parts being connected to the valve seat, the cylinder including means defining a depression closed at one end thereof and open at the opposite end thereof, the piston including a plunger substantially matching the cross section of the depression and disposed so as to project into the open end of the depression shortly before the closure member has reached the position thereof wherein the valve is closed, the outer surface of the plunger and the defining surface of the depression being so formed as to define a gap narrowing down during closing movement of the closure member.</p> |
