| 摘要 |
PURPOSE:To reduce the weight and the manufacturing cost of a gate valve device for a concrete pump, by employing such an arrangement that a pair of guide plates having the same form and formed respectively with a actuator rod supporting part and a flange for covering holes in a housing are disposed in the housing in a freely detachable manner. CONSTITUTION:Holes 2a, 2b are formed in a pair of symmetrical housings 1 in which a gate valve means is placed. A pair of guide plates 6 consist respectively of a main body 6a, an actuator rod supporting part 6c for supporting an actuator rod 3 in a freely reciprocable manner, and a flange part 6c for covering the inside of the hole 2a or 2b formed in the housing 1. Therefore, wear of the housings 1 due to their contact with the actuator rods 3 is prevented by the actuator rod supporting parts 6b while wear of the housings 1 due to their contact with a gate valve 4 is prevented by the flange parts 6c. |
