VALVE APPARATUS AND HIGH PRESSURE PUMP HAVING THE SAME

摘要

A common seat portion includes discharge passages that communicate between a first valve chamber and a second valve chamber when a discharge valve member is lifted away from the common seat portion. The common seat portion also includes a relief passage that extends substantially parallel to the discharge passages and communicates between the first valve chamber and the second valve chamber when a relief valve member is lifted away from the common seat portion.

主权项

1. A valve apparatus comprising:
a valve housing; a first valve element that is reciprocatably received in one end portion of the valve housing; a first urging device that urges the first valve element toward another end portion of the valve housing, which is opposite from the one end portion of the valve housing; a second valve element that is reciprocatably received in the another end portion of the valve housing; a second urging device that urges the second valve element toward the one end portion of the valve housing; and a common seat portion that divides an inside of the valve housing into a first valve chamber, which receives the first valve element, and a second valve chamber, which receives the second valve element, wherein: the first valve element and the second valve element are seatable against and liftable away from the common seat portion; and the common seat portion includes:
at least one first communication passage that communicates between the first valve chamber and the second valve chamber when the second valve element is lifted away from the common seat portion; andat least one second communication passage that extends substantially parallel to the at least one first communication passage and communicates between the first valve chamber and the second valve chamber when the first valve element is lifted away from the common seat portion.