Valves and valve actuation – Fluid actuated or retarded – Fluid link or column actuator
Patent
1999-03-29
2000-07-18
Shaver, Kevin
Valves and valve actuation
Fluid actuated or retarded
Fluid link or column actuator
25112906, F16K 3112
Patent
active
060895292
ABSTRACT:
A valve for controlling liquids, which for actuation cooperates with a hydraulic step-up piston bore. A pressure chamber provided in the step-up piston bore is sealed off by two pistons and two diaphragms downstream of the two pistons. To compensate for liquid losses in the pressure chamber caused by pressure exerted on the step-up piston bore, control chambers are formed downstream of the pistons and upstream of the diaphragms, and each of the control chambers are connected to a leaking oil bore via a respective throttle bore. The throttle bores have a sharp-edged transition in the relief direction for the control chamber, and a rounded transition in the filling direction for the control chamber, and as a result a minimum pressure for refilling the pressure chamber is always available. The valve is intended for use in fuel injection systems for motor vehicle internal combustion engines.
REFERENCES:
patent: 4728074 (1988-03-01), Igashira et al.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Shaver Kevin
Welsh John P.
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