Internal-combustion engines – Charge forming device – Fuel injection system
Patent
2000-02-04
2000-10-03
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123506, 123514, 137469, F02M 3704, F16K 1506
Patent
active
061258229
ABSTRACT:
A two stage pressure relief valve for releasing a fluid under pressure includes a body having a bore extending from an inlet and terminating in an outlet. A first chamber which communicates with the inlet and a second chamber which communicates with the first chamber and the outlet are provided and are dimensioned such that the cross sectional area of the second chamber is greater than that of the first chamber. An operator seat is disposed within the body and an operator is moveably disposed within the bore and engages the operator seat. The operator includes a blocking surface which blocks at least a portion of the flow of fluid. When the pressure of the fluid exceeds a threshold pressure, the operator is unseated whereby fluid flows at a first flow volume such that at least a portion of the fluid impinges the blocking surface causing the blocking surface to move within the second chamber whereby fluid flows at a second flow volume. The second flow volume being greater than the first flow volume.
REFERENCES:
patent: 3626975 (1971-12-01), Bobst
patent: 4949746 (1990-08-01), Kay
patent: 5170818 (1992-12-01), Hatzikazakis
patent: 5251664 (1993-10-01), Arvidsson et al.
patent: 5558063 (1996-09-01), Minagawa et al.
patent: 5560343 (1996-10-01), Werkmann et al.
Janik Leon P.
O'Brien Michael J.
Moulis Thomas N.
Stanadyne Automotive Corp.
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