To improve rear suction with slight costs on a construction, and effectively avoid generation of a cavitation by arranging a valve for connecting a delivery side to a feed side of a consumption apparatus in an opening condi tion, on an after suction device.
A rear suction device provided with a valve 300b is arranged on a control brake valve 5b operated as a brake valve. The valve 300b is loaded on an opening position by brake pressure shut out in a spool inner casing when pressure in a forcibly feed leading pipe 8a, namely, in an annular passage is lower than a pressure in the spool inner casing, namely in the forcibly feed leading pipe 8b of a delivery side. A pressure medium flows from the leading pipe 8b to the leading pipe 8a bypassing the valve 300b, namely, it flows from the delivery side B to a feeding side A of a consumption apparatus. Therefore, a pressure balance 320b in the spool inner casing of the brake valve is operated as a check valve on braking, and thereby, return pressure is improved so as to improve an after suction condition.
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