Plunger-type fuel pressure regulator
This patent describes improvement in a pressure regulator for use in feeding the output of a relatively high pressure and relatively large liquid volume pump means to a point of use requiring, under some operating conditions, only a relatively small portion of the output volume of the pump means and a substantial reduction of the relatively high pressure, the pressure regulator being of the back pressure diaphragm means operated type, the pressure regulator comprising a body formed with an inlet chamber and an outlet chamber, wall means between the inlet and outlet chambers, and a valve seat formed with a conical sealing surface formed in the wall means. The improvement comprises: a throttling and sealing member in the form of a plunger, the plunger comprising a nose portion defined by a conical surface, the included angle defining the valve seat conical surface being larger than the included angle defining the nose portion conical surface, an O-ring groove formed in the nose portion, an O-ring in the O-ring groove, the shapes and sizes of the O-ring and the O-ring groove being such that the O-ring protrudes beyond the nose portion conical surface in the unsealed condition of the plunger with respect to the valve seat a relatively very small distance, the shapes and sizes of the nose portion and of the valve seat being such that portions of the nose portion contact the valve seat to form the primary seal against flow through the valve seat, and any seal formed between the O-ring and the valve seat is a secondary seal.
- Assignee:
- Mallory, Inc., Carson City, NV (USA)
- Patent Number(s):
- US 4998557; A
- Application Number:
- PPN: US 7-544428
- OSTI ID:
- 5377721
- Resource Relation:
- Patent File Date: 27 Jun 1990
- Country of Publication:
- United States
- Language:
- English
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