| 摘要 |
A method for manufacturing a piston valve comprising boring a plurality of pairs of holes in the predetermined portions of the peripheral surface of the hollow sliding member of the piston valve, said member being made of wear resistant material such as monel metal, inserting a flexible rod or tube through each pair of the holes, filling the hollow sliding member with moldable material with the rod kept in a predetermined curved state to permit the material to be cured, and thereafter withdrawing the rod from the member.
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