| 摘要 |
The metering servovalve ( 7 ) comprises a valve body ( 8, 30 ), an open/close element ( 45 ) and an electromagnet ( 15 ), and is housed in a casing ( 2 ) of the injector ( 1 ). The electromagnet ( 15 ) actuates a mobile armature ( 16 ) for a travel defined by a polar surface ( 19 ) of the core ( 18 ) of the electromagnet ( 15 ). This latter is fixed in the casing ( 2 ) by means of a threaded ring nut ( 40 ), with the interposition of at least one deformable adjustment shim ( 48 ). The ring nut ( 40 ) is screwed with a pre-set tightening torque on a thread ( 46 ) of the casing ( 2 ) so as to bring about an elastic deformation of the adjustment shim ( 48 ) and to prevent accidental unscrewing of the ring nut ( 40 ). The adjustment shim ( 48 ) is constituted by a metal ring with a cross section having a shape chosen between L, C, S, Z, and Sigma.
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