| 摘要 |
PURPOSE:To prevent occurrence of a shock by controlling the braking force of a spring brake equipment by means of a pilot valve that controls a direction control valve. CONSTITUTION:Pilot circuits P1 and P2 of a pilot valve PV are connected to pilot parts 10a and 10b of a direction switching valve KV. At the same time, they are connected to a brake equipment BB via a shuttle valve B6. With this contrivance, when the speed is switched frm 'high' to 'medium', the braking force takes a value corresponding to the control quantity of the direction switching valve KV, thereby preventing a shock from occurring. |
