| 摘要 |
Cavities are bored out of a housing block(1), and the valve piston(4) accommodated in one(5) of them has one end for operation only by pressure, and opposed to it on the other side is a compression spring(8). The bore housing the valve piston on one side is closed off by an insert(13) seated in a widened section(12) of the bore. The insert is sealed(14) on its inner circumference in relation to the valve piston, and on its outer circumference sealed(15) in relation to the block.
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