Brake pressure control valve of a double piping system

摘要

Each of two valves disposed in a housing is constructed as a unit which comprises a casing in which substantially all essential parts of the valve are housed, and a plug member removably connected to the casing for retaining the parts in the casing. The valve comprises a valve body movably disposed in the casing, a piston slidably disposed in the casing and movable in fore-and-aft directions in response to application of hydraulic pressure thereto to open and close, in cooperation with the valve body, the communication between inlet and outlet ports of the valve, and a valve seat mounted to the piston for assuring the communication open end close function achieved by the valve body and the piston, wherein the valve seat has a configuration which affects the characteristics of the piston, and the valve seat is removably connected to the piston.