| 摘要 |
The pneumatic pulsator (10; 10A) for milking plants comprises a pneumatic operating device for moving a slide valve (64) with reciprocating rectilinear movement to cyclically connect a vacuum source to the pulsation chambers of a milking unit. The slide valve (64) slides along a plate (62) of anti-wear synthetic material which is not affected by environmental climatic variations and presents ports communicating with the vacuum source and with the pulsation chambers. The plate (62) is sealedly pressed against a base (34) in which conduits are provided. From the base (34) there project two mutually facing side walls (36.1, 36.2) forming part of the body (12), as does the base (34). The body (12) of the pulsator (10) has a rigid frame structure, of which the base (34) forms a first side, a second and a third side being formed by the side walls (36.1, 36.2), and a fourth side being formed by a rigid crosspiece (38). There is also provided a rigid U-piece (52) which straddles the slide valve (64) and is provided with two feet (56) which rest on the plate (62). The U-piece (52) is pressed against the plate (62) via a spherical hinge (54, 58) lying on an axis perpendicular to the plate (62) and centered with respect to the feet (56) of the U-piece (52). The body (12) and the U-piece (52) are constructed of a synthetic material which is not affected by environmental climatic variations. <IMAGE>
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