| 摘要 |
PURPOSE: A shutoff valve for blocking vacuum closed by a spring force contains an improved structure for disassembling and assembling the valve. CONSTITUTION: A shutoff valve(100) for blocking vacuum contains: a valve body(111) composing a first opening(138) and a second opening(140) formed in the lower end of the valve body, a piston(122) moving up and down, a cylinder(118) combined to the upper unit of the valve body for composing an air inflow port(120) to inject air to the lower side of the piston for pushing up the piston to a second location, a sealing plate(132) for separating the valve body from the cylinder, an opening and closing unit(142) for opening and closing the second opening, a shaft(124) composing a lower end unit fixed to the opening and closing unit and an upper end unit penetrating the piston and the sealing plate, and a spring(130) for attaching the opening and closing unit to the second opening using elastic force. Herein, the shaft contains threads from the upper end unit to the location for a nut(126) to combine(B unit) for the upper unit of the shaft to be covered by a cap(136) preventing abrasion. Therefore, an operator does not have to push the piston for removing or combining the nut while disassembling or assembling the valve for blocking vacuum.
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