| 摘要 |
A door closer has an inner cylinder receiving a piston slidably therein, an outer cylinder surrounding the inner cylinder to define a space therebetween, which space communicates with the interior of the inner cylinder at the opposite ends thereof, a piston rod extending from the piston out of one end of the inner cylinder and for connection to a door to urge it to the closed position, a valve mechanism disposed in the other end of the inner cylinder to control oil flow between the interior of the inner cylinder and the space. The door closer is mounted horizontally and a portion of the space is filled with high pressure gas.
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