Patent ID: 7481149

Claim:
A control valve for use in both-hand operation, wherein two manual operation valves ( 2 a and 2 b ) to be operated by left and right hands are respectively connected to two main input ports ( 11 a and 11 b ) of a valve body ( 10 ), and when the two manual operation valves ( 2 a and 2 b ) are operated within a certain time, air pressure is outputted to a fluid pressure driving device ( 5 ) from a main output port ( 12 ) of the valve body ( 10 ) on the basis of an output of the manual operation valves ( 2 a and 2 b ), comprising: an AND valve ( 20 ) and a shuttle valve ( 21 ) connected between both of main input ports ( 11 a and 11 b ) by respectively connecting one of pairs of input ports ( 20 a and 20 a / 21 a and 21 a ) to the two main input ports ( 11 a and 11 b ); a main switching valve ( 23 ) wherein a valve input port ( 23 a ) is connected to an output port ( 20 b ) of the AND valve ( 20 ), and a valve output port ( 23 b ) is connected to the main output port ( 12 ); and a tank ( 30 ) connected to an output port ( 21 b ) of the shuttle valve ( 21 ) through an aperture ( 26 ), in an inner part of the valve body, wherein a capacity of the tank ( 30 ) is set such that a time until an internal pressure of the tank ( 30 ) reaches a certain set pressure by compressed air flowing into the tank ( 30 ) through the aperture ( 26 ) becomes equal to a time difference allowed for operation for the two manual operation valves ( 2 a and 2 b ), and wherein the pressure in the tank ( 30 ) is applied to a valve member ( 35 ) of the main switching valve ( 23 ) and a communication between the valve input port ( 23 a ) of the main switching valve ( 23 ) and the valve output port ( 23 b ) thereof is blocked by the set pressure, wherein a cover ( 31 ) for forming the tank ( 30 ) is fixed in an airtight manner at an upper surface of the valve body ( 10 ), and the AND valve ( 20 ), the shuttle valve ( 21 ), and each valve hole ( 36 ) of the main switching valve ( 23 ), are opened from the upper surface of the valve body ( 10 ), and wherein a plate ( 33 ) for closing the valve hole ( 36 ) is fixed to an upper surface of the valve body ( 10 ) in an airtight manner, and a continuous hole ( 33 a ) for introducing the internal pressure of the tank ( 30 ) into a first pressure-receiving end surface ( 35 a ) of the valve member ( 35 ) in the main switching valve ( 23 ) and a continuous hole ( 33 b ) for allowing a flowing passage from the shuttle valve ( 21 ) to communicate with the tank ( 30 ) through the aperture ( 26 ) are pierced in the plate ( 33 ).