| 摘要 |
1537438 Reciprocating pumps NIIGATA ENG CO Ltd 4 Oct 1977 [8 Oct 1976] 41122/77 Heading F1A A valve for a concrete pump of the two piston and cylinder type comprises a frusto-conical valve body 6 rotatably mounted on a wall 7 of a hopper (5), Fig. 1 (not shown) and having at least one intake passage 10 and a discharge passage 9 connected to a discharge conduit 15. The valve is provided with a replaceable seal plate 8, stirrers 16, is rotated by a shaft 11 via an arm (12) and hydraulic cylinder (13), Figs. 1, 4 and 5 (not shown), and may be urged towards the wall 7.
|
