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US 6,553,979 B2Granted
Pressure-regulating piston with built-in relief valve
AssigneeASCO Controls, LP
InventorJohn E Albright
Life of this patent
Estimating the term…
Abstract
A pressure-regulating valve particularly useful in a diesel internal combustion engine with a closed crankcase is provided. The valve includes a body coupled to a bonnet with an internal movable piston. The movable piston maintains a substantially constant pressure in the crankcase by adjusting a fluid flow in response to changes in pressure. The movable piston also includes an integral relief valve to prevent overpressure in the event of a crankcase pressure in excess of the designed limits of the pressure-regulating valve.
Claims9
A pressure-regulating valve comprising:
- a body with a fluid passageway therethrough;
- a movable piston disposed within the body and movable in response to pressures thereon to adjust a fluid flow through the fluid passageway;
- and
- a relief valve integral to the piston, wherein at least one hole in the piston is exposed to a relief passageway upon the application of a predetermined level of pressure on the piston.
1 more element
Dependencies are inferred from the claim text.