Порт дахь даралт нь гол дамар дээрх үйлдэлд байгаа. At the same time pressure is applied via the control lines (6) and (7), which are fitted with orifices (4) and (5), on the spring loaded side of the main spool (3) and at the ball (8) in the pilot control valve (2). Хэрэв порт дахь даралт нь хавар (9) хавар (9) хавар (9), бөмбөг (8) хавар (8) хаврын эсрэг (8) нээгдэнэ.
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