| 摘要 |
A pilot-operated solenoid valve includes a pilot valve unit having a fixed core and a movable core, and a passage block formed with a valve seat which a diaphragm valve element comes into contact or separates from. The pilot valve unit includes an NO port, a common port, and an NC port. The passage block is formed with an inlet port, an outlet port, a back chamber, an NO passage, a common passage, an NC passage an external exhaust passage, and an internal exhaust passage. The solenoid valve further includes a first or second metal ball to seal the external exhaust passage or the internal exhaust passage. The passage block includes a flat cover formed with a communication passage for communicating the recess with the common port. |
| 主权项 |
1. A pilot-operated solenoid valve provided with a pilot valve unit having a fixed core and a movable core, and a passage block formed with a valve seat which a valve element comes into contact or separates from,
wherein the valve element is a diaphragm valve element, the pilot valve unit includes an NO port, a common port, and an NC port, the passage block is formed with an inlet port, an outlet port, a back chamber defined by the diaphragm valve element, an NO passage for communicating the inlet port with the NO port, a common passage for communicating the back chamber with the common port, an NC passage communicated with the NC port, an external exhaust passage for communicating the NC passage with atmosphere, and an internal exhaust passage for communicating the outlet port with the NC passage, the pilot-operated solenoid valve further includes a sealing member to seal one of the external exhaust passage and the internal exhaust passage, the passage block has a rectangular parallelepiped shape having a pair of wide opposite surfaces and four side surfaces surrounding the wide opposite surfaces, the four side surfaces including a first surface attached thereon with the pilot valve unit and a second surface formed with at least one of the inlet port and the outlet port, the diaphragm valve element is placed in parallel with the pair of wide opposite surfaces, the passage block includes a block body and a flat cover having a flat plate shape, the flat cover including a recess forming the back chamber, and the flat cover is formed with a flat-cover communication passage for communicating the recess with the common port. |
