Smc Corporation

Akira Enzaki

Toyonobu Sakurai

Yoichi Morodomi

Mamoru Fukuda

An air control circuit including a safety function is simply formed from an air circuit. An air control circuit includes a main air line that controls an air device by concurrently turning on or off two external-pilot-operated electromagnetic valves, a pilot air line that supplies pilot air to the electromagnetic valves, and a pilot control line that switches the pilot air line between a supply state and an exhaust state. When one of the two electromagnetic valves suffers a breakdown to fail to be switched to an off position, air in the air device is exhausted through the other electromagnetic valve that has been switched to the off position to recover the air device, and the pilot air line is switched to the exhaust state by the pilot control line to prevent the two electromagnetic valves from restarting.

Air control circuit equipped with safety feature

Electromagnetic valve

A vacuum valve includes a main flow channel that connects the first port and the second port, a main valve seat that surrounds the main flow channel, a main valve disc that opens and closes the main flow channel by contacting and separating from the main valve seat, a sub-flow channel that is formed inside the main valve disc, a sub-valve seat that is formed on an outer surface of the main valve disc, a sub-valve disc that opens and closes the sub-flow channel by contacting and separating from the sub-valve seat at a position outside the main valve disc, and a rod that causes the main valve disc and the sub-valve disc to open and close. The sub-valve disc opens and closes the sub-flow channel by being operated directly by the rod, and the main valve disc opens and closes the main flow channel by being operated via the sub-valve disc by the rod.

Vacuum valve

A poppet valve seal mechanism has a groove to which a seal member is mounted such that a width of an opening of the groove is smaller than a maximum width inside of the groove and a cross section area of the groove is smaller than that of the seal member. A maximum width of a portion of the seal member accommodated in the groove is greater than a width of the opening of the groove. A width of the opening is constant over its entire peripheral. An inner wall forming the inside of the groove is formed with communication holes and which bring the inside of the groove and the outside of the groove into communication with each other.

Poppet valve seal mechanism

To provide a maintenance-easy two-port valve capable of easily assembling and disassembling a valve body and a bonnet, and preventing the bonnet from being detached from the valve body by an erroneous operation. In a two-port valve having attachment means for detachably attaching a bonnet to a valve body the attachment means includes a plurality of shafts fixedly attached to a valve body and each having an engagement groove on an upper end portion, a handle a plate rotatably provided between an upper end portion of the bonnet and the handle and having an engagement groove engaged to or disengaged from the retaining groove by rotating the plate and an engagement pin engaged with an engagement hole provided in the plate at a push-down position of the handle transmitting the rotation of the handle to the plate and fixedly attached to the handle

Maintenance-easy two-port valve

A magnet is attached to a piston which slides in the interior of a casing due to action of fluid pressure, a guide groove is provided on a side face of the casing in a movement direction of the piston, an indicator is received in the guide groove, and at least one portion of the indicator is formed of a magnetic body, so that the indicator can displace following the piston.

Growing community of inventors

Tsukuba-gun, Japan

Akira Enzaki