| 摘要 |
The double-acting valve assembly incorporates a square-section central body (12) integral with a tube (11) connected to the dispensing pump, and two sleeves (17a,17b) for induction and expulsion of the product through tubes (24a,24b). Two sliding pistons (26a,26b) activate a central reciprocating blocking core (14). Two closures (29a,29b) are supplied alternately with compressed air through ports (30a,30b). Eight butterfly nuts (32) are tightened on to four gripper rods (13) at the corners of the central body.
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