Importance

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Abstract

A valve element is provided comprising an inlet configured to receive a fluid at a first pressure, a vent that can be blocked or unblocked to vent fluid from the valve element, and a port formed in an actuating surface of the valve element at which the fluid is at a second pressure. A first internal fluid passage connects the inlet to the vent, and a second internal fluid passage connects the port to the first internal fluid passage at an angle with respect to the first fluid passage. The port is configured to be closed such that the net flow of fluid into and out of the port is substantially zero. The valve element is configured such that the second pressure is substantially equal to the first pressure when the vent is blocked and substantially lower than the first pressure when the vent is not blocked.

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First Claim