Fluid pressure biased valve with dashpot

Claim 1

A VALVE COMPRISING, A CASING HAVING AN INLET LINE AND AN OUTLET LINE, A CHAMBER ON THE CASING CONNECTING THE INLET AND OUTLET, A SPOOL MOUNTED IN THE CHAMBER AND MOVABLE AXIALLY THEREIN TO ALLOW AND INTERRUPT FLOW FROM THE INLET TO THE OUTLET, SAID SPOOL IN A FIRST POSITION INTERRUPTING THE FLOW AND IN A SECOND POSITION ALLOWING SAID FLOW. A PILOT LINE CONNECTED TO THE CHAMBER ON ONE SIDE OF THE SPOOL AND WHEN PRESSURIZED URGING THE SPOOL TOWARD THE SECOND POSITION, MEANS INCLUDING A BLEED CONNECTED TO THE CHAMBER ON THE OPPOSITE SIDE OF THE SPOOL AND CONNECTED TO THE INLET LINE FOR IMPEDING FLOW FROM THE CHAMBER BACK INTO THE INLET LINE TO SLOW MOVEMENT OF THE SPOOL FROM THE FIRST TO THE SECOND POSITION, SAID BLEED PROVIDING A PRESSURE SOURCE FROM THE INLET LINE TO RETURN THE SPOOL TO ITS FIRST POSITION WHEN THE PILOT LINE IS DEPRESSURIZED, AND A SECTION PROVIDED ON THE SPOOL FOR ALLOWING A LESSER FLOW AND THEN A GREATER FLOW THROUGH THE CASING WHEN THE SPOOL MOVES FROM THE FIRST TO THE SECOND POSITION, SAID SECTION IN THE SPOOL INCLUDING AN ANNULAR GROOVE TO ALLOW LIMITED FLOW THROUGH THE CASING WHEN THE SPOOL MOVES A PORTION OF THE WAY FROM THE FIRST TO THE SECOND POSITION AND SAID SECTION ALSO INCLUDING A LARGER ANNULAR GROOVE TO ALLOW GREATER FLOW THROUGH THE CASING WHEN THE SPOOL IS IN THE SECOND POSITION.