US 10,024,443 B2Granted

Hydraulic circuitry for skid steer loader valve

AssigneeParker-Hannifin Corporation

InventorsChuck Sensabaugh, Dennis Reynolds, Brian Slattery

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Abstract

Arrangements of a flow path to achieve a series circuit, a regeneration circuit and a float/passive regeneration circuit. For example, a valve body having a spool bore, a valve inlet, a plurality of cavities opening into the spool bore and a spool disposed in the spool bore. A first cavity fluidly connected to a tank passage, a second cavity fluidly connected to a first work port, a third cavity fluidly connected to an inlet of another valve, a fourth cavity fluidly connected to a second work port, a fifth cavity fluidly connected to the valve inlet, a sixth cavity fluidly connected to the first work port, a seventh cavity, an eighth cavity fluidly connected to the valve inlet, a ninth cavity fluidly connected to the inlet of the other valve and a tenth cavity fluidly connected to the valve inlet.

Claims26

Dependent claims

A hydraulic valve assembly comprising:

a valve body having a spool bore, a valve inlet, and a plurality of cavities opening into the spool bore;
and
a spool disposed in the spool bore,
wherein the plurality of cavities includes:
a first cavity fluidly connected to a tank passage;
a second cavity adjacent the first cavity and fluidly connected to a first work port;
a third cavity adjacent the second cavity and fluidly connected to an inlet of another valve;
a fourth cavity adjacent the third cavity and fluidly connected to a second work port;
a fifth cavity adjacent the fourth cavity and fluidly connected to the valve inlet regardless of the spool's position;
a sixth cavity adjacent the fifth cavity and fluidly connected to the first work port regardless of the spool's position;
a seventh cavity adjacent the sixth cavity;
an eighth cavity adjacent the seventh cavity and fluidly connected to the valve inlet regardless of the spool's position;
a ninth cavity adjacent the eighth cavity and fluidly connected to the inlet of the other valve;
and
a tenth cavity adjacent the ninth cavity and fluidly connected to the valve inlet.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/176,796Filed 8 Jun 2016 · us provisional application
Priority: 9 Jun 2015
Published: US 2016/0363227 A115 Dec 2016
Granted: 17 Jul 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

F16K 11/07
With linearly sliding closure members: with cylindrical slides
E02F 3/3414
With bucket-arms , i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of…:…
E02F 9/2228
Using pressure-compensating valves: including an electronic controller
E02F 9/2267
Arrangements or adaptations of elements for hydraulic drives: valves or distributors