Damped check valve having multi-pressure operation

A check valve, comprising:

• a liner, the liner defining a flow passage aligned along a longitudinal axis defined by the liner and having a radial wall forming a plurality of outlet grooves between a plurality of extensions at an outlet portion thereof;
• a poppet, the poppet having a first flow face and a second flow face and an axially extending sidewall interposed between the first flow face and the second flow face;
• a biasing element operably coupled between the poppet and the liner to bias the first flow face against an annular seat defined by the liner in a closed position;
• and
• wherein a first portion having a first area of the first flow face is arranged such that fluid will contact said first portion in the closed position, and wherein a second portion of the first flow face having a second area greater than the first area is arranged such that fluid will contact said second portion when the poppet is unseated from the annular seat in an open position;
• and
• wherein a radial clearance is defined between the axially extending sidewall of the poppet and the radial wall of an outlet portion of the liner such that a controlled leakage flow is permitted from the outlet portion past the axially extending sidewall and out of the outlet grooves once the poppet has unseated from the annular seat.

A check valve, comprising:

• a liner, the liner defining a flow passage aligned along a longitudinal axis defined by the liner, the flow passage having an inlet portion and an outlet portion downstream from the inlet portion relative to the direction of the flow of fluid through the flow passage, and the liner further having a radial wall forming a plurality of outlet grooves between between a plurality of extensions at an outlet portion thereof;
• a poppet, the poppet having a first flow face and a second flow face, wherein an axially extending sidewall of the poppet is interposed between the first and second flow faces;
• a biasing element operably coupled between the poppet and the liner to bias the first flow face against an annular seat defined by the liner in a closed position of the check valve;
• wherein the poppet is movable from the closed position to an open position wherein the poppet is unseated from the annular seat and from the open position to a full open position, wherein in the full open position an entirety of the axially extending sidewall is downstream relative to the direction of fluid flow through the flow passage from a downstream edge of the outlet portion;
• and
• wherein a radial clearance is formed between the axially extending sidewall and the outlet portion of the flow passage such that a leakage flow is permitted from the inlet portion through the outlet portion in the open position.