SCREW VALVE HAVING ENHANCED AIRTIGHT EFFECT
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United States of America Patent
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Issued Date -
Feb 28, 2019
app pub date -
Aug 23, 2017
filing date -
Aug 23, 2017
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Abstract
A screw valve having an enhanced airtight effect comprises a valve body, a shield assembly, and a drive assembly. The valve body has a valve port, the shield assembly is mounted in the valve body to have an opened state and a closed state for the valve port, and the drive assembly is mounted in the valve body to provide power, and at least comprises an elastic assembly form the closed state, and a transmission screw to form the opened state at a position of the valve port. The elastic assembly provides an elastic force for the shield assembly in the closed state, ensuring that the shield assembly keeps the closed state at the valve port, and the airtight effect of the screw valve is enhanced.
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