Patent · US Expired

Diaphragm vent valve for fluid storage tank with vapor recovery system

US4137943A · kind A · utility

10Cited by
5References
8Claims
0Family size

Inventor

Key dates

Filing dateAug 31, 1977
Grant dateFeb 6, 1979
Priority date—
Expiry dateAug 31, 1997

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T137/86324
  • WIPO fieldHandling
  • WIPO sectorMechanical engineering

Abstract

A tank for volatile fluid is fitted with a diaphragm vent valve as an integral portion of a system in which both emission control regulations and safety regulations are met. Vapors are recovered in this system but more importantly, the tank such as the one on a tank truck, cannot be filled through a bottom loading valve normally provided near the bottom of the tank, unless the vent valve is open. The vent valve includes a disc which, when the vent valve is closed, sealingly engages the interior upper surface of the tank, and when opened, is pushed away from the interior upper surface. This design provides for a low exterior profile of the valve body, and a valve operable with relatively low air pressure.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.