Patent · US Expired

Safety valve

US4112971A · kind A · utility

4Cited by
4References
7Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMay 12, 1977
Grant dateSep 12, 1978
Priority date—
Expiry dateMay 12, 1997

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T137/7834
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

A valve intended to open in response to a pressure difference between the interior of the valve and the exterior thereof comprises a diaphragm which in its closing position is conical. The diaphragm has an opening which is normally closed by means of a valve stem. Arrangements are made to prevent communication between the interior of the valve and the exterior thereof until said diaphragm has been deformed to a substantially planar shape.

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