| 摘要 |
The metering valve (24) has a shutter (44) for a discharge conduit (43), and an electromagnet (26) for controlling an armature (27) disconnected from the respective stem (47) and sliding along the stem (47) by means of a sleeve (48). The stem (47) is guided by a fixed sleeve (53) and is pushed by a first spring (52) to hold the shutter (44) in the closed position, and a second spring (61) keeps a shoulder (50) of the armature (27) resting axially against a C-shaped ring (49) fitted to the stem (47). To reduce the overtravel of the armature (27) with respect to the travel of the stem (47) to move the shutter (44) into the closed position, and to damp oscillation of the armature (27), provision is made, between the two sleeves (48, 53), for a bush (62) of calibrated thickness (S), which slides along the stem (47) and is such as to form a small axial clearance (P) with the sleeves (48, 53). <IMAGE> <IMAGE> |
