| 摘要 |
<p>A check valve assembly has a conduit section with an inlet 12 and an outlet 14 on a longitudinal axis thereof, and first and second check valves in the conduit section. The check valves 30-50 respectively have first 32 and second 52 valve stems movable along a common axis inclined to the longitudinal axis, first 40 and second valve seats 60 and co-operating valve plates 42-56 perpendicular to the common axis and mounted on the valve stems. The first check valve is upstream of the second check valve, and the second valve seat has a larger diameter than the first valve seat. The first and second valve seats have portions located between the inlet and the outlet, and the first valve plate has a lift sufficient to enable fluid flowing from the inlet to the outlet, when the valves are open, to flow past the portions of the valve seats in a substantially straight line from the inlet to the outlet. The conduit section has removable means for securing the check valves in position.</p> |
