US 9,810,334 B2
Pressure limited flow priority boost
Gregory T. Coolidge, Eylria, OH (US)
Assigned to Parker-Hannifin Corporation, Cleveland, OH (US)
Appl. No. 14/765,139
Filed by Parker-Hannifin Corporation, Cleveland, OH (US)
PCT Filed Jan. 31, 2014, PCT No. PCT/US2014/014167
§ 371(c)(1), (2) Date Jul. 31, 2015,
PCT Pub. No. WO2014/121081, PCT Pub. Date Aug. 7, 2014.
Claims priority of provisional application 61/759,333, filed on Jan. 1, 2013.
Prior Publication US 2015/0362087 A1, Dec. 17, 2015
Int. Cl. F15B 11/042 (2006.01); F16K 17/18 (2006.01); F15B 13/04 (2006.01); F16K 3/02 (2006.01); F16K 31/12 (2006.01)
CPC F16K 17/18 (2013.01) [F15B 11/042 (2013.01); F15B 13/0418 (2013.01); F16K 3/029 (2013.01); F16K 31/12 (2013.01); Y10T 137/7838 (2015.04)] 15 Claims
OG exemplary drawing
 
1. A pressure limited flow priority boost valve comprising:
an inlet chamber;
a metering chamber;
a spool bore fluidly connected between the inlet chamber and the metering chamber;
a feed chamber opening to two longitudinally spaced locations of the spool bore;
a compensator that fluidly couples the metering chamber to the feed chamber;
a first workport chamber that fluidly couples a first workport to the spool bore; and
a spool disposed in the spool bore and moveable from a neutral position to a first workport position,
wherein the spool includes:
an outer spool body having a first longitudinal side and a second longitudinal side, the first longitudinal side having a longitudinal bore and at least one radial bore in fluid communication with the longitudinal bore;
an inner spool body disposed in the longitudinal bore and axially movable with respect to the outer spool body, the inner spool body being biased toward the second side, wherein a metering chamber bypass is formed in the longitudinal bore of the outer spool body between an exterior peripheral surface of the inner spool body and an interior peripheral surface of the outer spool body, the inner spool body including at least one longitudinal bore and at least one radial bore in fluid communication with the longitudinal bore of the inner spool body and the radial bore of the outer spool body,
wherein, when the spool is in the neutral position, the metering chamber bypass is blocked and the inlet chamber is disconnected from the metering chamber, the feed chamber, and the first workport chamber, and
wherein, when the spool is in the first workport position, (i) the inlet is fluidly connected to the metering chamber via a first fluid passageway, and the metering chamber bypass forms a second fluid passageway that fluidly connects the inlet to the workport chamber while bypassing the metering chamber and the compensator if a pressure at the workport chamber is below a predetermined value, and (ii) the inlet is disconnected from the workport chamber via the metering chamber bypass if the pressure at the workport chamber is above a predetermined value.