Bottom operable tank car valve assembly having shear plane

Details Bottom operable tank car valve assembly having shear plane Bottom operable tank car valve assembly having shear plane

1977-06-08

1978-11-07

Cline, William R.

Valves and valve actuation

With correlated flow path

Tank

251268, 251292, 137797, F16K 148

Patent

active

041241932

ABSTRACT:
A bottom operable lading valve assembly for tank cars includes a valve closure plug movable between open and closed positions relative to a circular plug seat located within a valve body opening. A housing is affixed to the valve body with fasteners comprising a shear plane. The housing includes a generally vertical housing opening into which a rotatable valve operator is mounted comprising a lower tool connection portion and an upper operating portion. The upper operating portion includes upper operator threads which engage an operating stem depending from the valve plug. The valve operator separates below the shear plane in the event impact causes the housing to shear off along the shear plane to maintain the closure plug in seated position to prevent escape of lading. During rotation of the valve operator in a direction to move the closure plug to open position, the closure plug wipes the plug seat. Further rotation of the valve operator causes the plug to move vertically toward open position without rotation. Rotation of the valve operator from open position causes the plug to move vertically downwardly to a closed and seated position without rotation.

REFERENCES:
patent: 2092926 (1937-09-01), Lithgow
patent: 2139280 (1938-12-01), McBride
patent: 2190723 (1940-02-01), McBride
patent: 3219054 (1965-11-01), Elder et al.
patent: 3586019 (1971-06-01), Thomas
patent: 3591131 (1971-07-01), Carlson

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