Portable device for determining physical qualities of pressurized container contents

Claim 1

Apparatus for gauging liquid in pressurized tanks having at least one sealable outlet port comprising in combination a portable hand held measuring device and a valve housing assembly secured to the tank outlet port at each station to be gauged, said hand held measuring device comprising: (a) a reel housing having a hand hold thereon; (b) a fluid responsive device; (c) a tape reel mechanism including a tape assembly having one end coupled with the fluid response device and the other end coupled with said tape reel mechanism; (d) a second elongate hollow housing carried by the reel housing; said housing adapted to receive a portion of the tape assembly and the fluid responsive device; (e) means at the upper end of the second housing providing a gas seal for the tape assembly; and (f) a stuffing nut engaging the external surface of the second housing; said valve housing assembly comprising: (1) means at the lower end therefor for sealing engagement with a tank outlet port; (2) an externally threaded neck at the opposite end of the valve housing sized to be engaged by the stuffing nut carried by the second housing; (3) an axial bore through the externally threaded neck, said axial bore having a diameter to freely receive said second elongate hollow housing; (4) a sealing means mounted in the axial bore of the threaded neck and adapted to sealingly engage the external surface of the said second elongate housing when said housing is inserted through the neck: (5) a valve seat at the inner end of the said neck; (6) a valve cap; (7) means pivotally mounting the valve cap within the valve housing; and (8) spring means urging the valve cap into sealing engagement with the valve seat, said valve cap being displaceable to a position to permit entry of a portion of the second housing into the valve housing against the urging of said spring by the inward movement of the second elongate housing.