Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1993-04-28
1995-04-11
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
13751627, 220203, 220208, F16K 1704
Patent
active
054049032
ABSTRACT:
A "smart vent" valve is mounted on a liquid storage tank employed in the transportation of liquid. The valve prevents overpressurization of the tank due to increases in vapor pressure and prevents discharge of liquid through the valve in response to pressure surges caused by accidental overturning of the tank. A valve member is provided for a vent opening. Sealing engagement is maintained between the valve member and the vent opening during a finite period of valve member travel caused by an increase in pressure within the tank. The rate of valve member travel is limited by hydraulic system in which hydraulic fluid is forced through orifices from one chamber to another. The high levels of pressure surges do not have sufficient duration to displace the valve member a distance sufficient to move it to a position in which the vent opening is unsealed and liquid could escape therefrom.
REFERENCES:
patent: 2361881 (1944-10-01), Sheppard
patent: 2880750 (1959-04-01), Amison
patent: 5048553 (1991-09-01), Vandevyver
patent: 5246027 (1993-09-01), Morris
Anderson Todd W.
Fahl Richard L.
Dover Corporation
Nilson Robert G.
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