Control valve

摘要

A control valve including a change-over poppet formed into a substantially cylindrical shape, a guide pipe inserted into the change-over poppet, and a load check poppet slidably fitted on the guide pipe. The change-over poppet is formed with a communication hole. A parallel passage is provided so as to communicate through the communication hole and guide pipe with an on-off valve, and between the parallel passage and the on-off valve is arranged an orifice. Opening of the on-off valve causes fluid to flow through the orifice and pressure loss to occur across the orifice to increase a pressure on an upstream side of the orifice, which acts to open the change-over poppet.