| 摘要 |
An inner cylinder has a reduced diameter portion and a proximally disposed transverse aperture. An outer cylinder has a distally disposed transverse hole. The inner and outer cylinders are coaxially disposed and sealingly engaged distally, thereby forming a cylindrical space between them. A cylindrical piston within the cylindrical space is slidably urged proximally by a coil spring. A cylindrical seal separates the space between a higher pressure proximal zone and a lower pressure distal zone, the seal moving with the piston. A mounting cylinder is sealingly engaged with the outer cylinder and terminates proximally with an internal thread for engaging a typical valve stem or a wheel mount for mounting the apparatus on an automotive wheel in place of a typical valve stem.
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