| 摘要 |
The 4/2-way valve is intended for controlling the water flow to a concrete pump actuating cylinders. It has a housing (1) with ports (2, 3, 4, 9) and a valve piston (5). The housing has three ports in its cylindrical wall, one (2) connected to the pressure source, and two (3, 4) connected to the cylinders. Return flow is via a central port (9) in the housing end cover (9). The hollow piston has cut-puts (8) near its ends. It also has annular shoulders (7, 6) for guidance, whilst shoulders (6) carry seals (15), which act together with reduced-dia. portions (21) in the housing to control flow and return in the two positions of the piston. |
