Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1980-07-21
1982-11-09
Spiegel, H. Jay
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137529, 137535, 137540, 251 611, F16K 2400
Patent
active
043579540
ABSTRACT:
An improved check valve for a backflow preventing valve of the type having an inlet passage, an intermediate chamber, and an outlet passage, includes a stationary valve port fluidly communicating with the intermediate chamber, a movable contoured valve seat for sealing the port, and a valve closing apparatus in rolling engagement with the valve seat and responsive to the pressure differential thereacross. The valve closing apparatus urges the valve seat to a valve closed position and includes a stationary shaft, a pair of rollers, and a spring. The spring biases the rollers against the contoured valve seat to thereby effect the closure of the seat member against the valve port. An improved exhaust valve is also provided and includes a balanced valve member providing a path between the intermediate chamber and the atmosphere when in a valve open position. The balanced valve member is resiliently biased between a valve seat and a moveable diaphragm. The diaphragm compares the inlet passage and intermediate chamber pressures and maintains the valve closed when the inlet passage pressure is greater than the intermediate chamber pressure, while moving to absorb fluid displacements from the intermediate chamber caused by large reductions in the inlet passage pressure.
REFERENCES:
patent: 1191376 (1916-07-01), Weber
patent: 3173439 (1965-03-01), Griswold et al.
patent: 3724487 (1973-04-01), Hunter
patent: 4080980 (1978-03-01), Hunter
patent: 4231387 (1980-11-01), Dixon
Spiegel H. Jay
The Toro Company
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