Get rid of three hole control valves of gluing bucket negative pressure

The utility model provides a get rid of three hole control valves of gluing bucket negative pressure, includes: valve body, slidable mounting piston, the seal installation in the valve body just slides cartridge in overlap intraductal thimble and install in the thimble end cover of sleeve pipe lower extreme opening part in the sleeve pipe of valve body lower extreme, the vertical installation in the piston lower extreme in the end cover on valve body top, the vertical installation. When the gluey pressure disk of cylinder drive shifts up, the epicoele volume diminishes, switching -over valve switching -over back, I exhaust of the mouth of pipe, the mouth of pipe II and the mouth of pipe III admits air, the piston shifts up, the thimble needle point left the round hole this moment, the compressed air of III entering of the mouth of pipe passes through the cavity and gets into in the sleeve pipe, get into gluey barrel in had better following the round hole on the thimble end cover, compressed air prevents effec