| 摘要 |
An automatic change-over apparatus is composed of an automatic switching valve(10), a first supply circuit (A), a second supply circuit (B), and an outlet (O). The supply circuit consists of hard boxes (14) and flexible bags (12). The automatic switching valve consists of inlets (15,16), an outlet (16), a check valve (CA), a ball (20), a spring (22), and a spool valve (SP). When the liquid of the first circuit is exhausted, the reduction of prssure causes the ball to open the check valve so that the liquid from the second circuit is supplied.
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