Bottom operable tank car valve assembly having shear plane

Valves and valve actuation – With correlated flow path – Tank

Patent

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Details

251291, 137544, 137797, F16K 148

Patent

active

041415353

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, a shaft portion and an upper operating portion. The upper operating portion includes upper operator threads which engage an operating stem depending from the closure plug. The upper operating portion and the valve stem terminate on or above the shear plane. The valve operator shaft portion separates below the shear plane in the event impact causes the housing to shear off along the shear plane to maintain the upper operating portion, valve stem and 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. A screen may be provided extending up into the tank from the valve body to protect the valve assembly from objects located inside the tank.

REFERENCES:
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patent: 1650406 (1927-11-01), Welcker
patent: 2092926 (1937-09-01), Lithgow
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patent: 2190723 (1940-02-01), McBride
patent: 2638924 (1953-05-01), St. Clair
patent: 3219054 (1965-11-01), Elder et al.
patent: 3439938 (1969-04-01), Dunton
patent: 3586019 (1971-06-01), Thomas et al.
patent: 3591131 (1971-08-01), Carlson
patent: 3656710 (1972-04-01), Shaw

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