초록 ▼

A flow force compensating method for a flow control valve and a flow control valve using the same method, in which a spool is supported by hydrostatic bearings within a sleeve and fluid flow from the hydrostatic bearing flows into a valve space defined between a spool land and a circumferential groo

A flow force compensating method for a flow control valve and a flow control valve using the same method, in which a spool is supported by hydrostatic bearings within a sleeve and fluid flow from the hydrostatic bearing flows into a valve space defined between a spool land and a circumferential groove of the sleeve, wherein a circumferential groove is formed in the spool land, bearing fluid flow flowing out of the bearing into the valve space defined between the circumferential groove and the sleeve groove is directed toward a central axis of the spool, and control flow is swirled by the bearing fluid flow, thereby compensating a flow force, acting on the spool.

대표청구항 ▼

[ What is claimed is:] [1.] A flow force compensating method for a flow control valve including a sleeve, a spool slidably provided in said sleeve and having a stem and a land, and a fluid passage structure formed in said control valve, said fluid passage structure including a valve stem space forme

[ What is claimed is:] [1.] A flow force compensating method for a flow control valve including a sleeve, a spool slidably provided in said sleeve and having a stem and a land, and a fluid passage structure formed in said control valve, said fluid passage structure including a valve stem space formed between said stem and said sleeve, and a valve land space defined between said land and a circumferential groove formed in said sleeve, wherein a control fluid flows from said valve stem space, through a control orifice, into said valve land space, wherein a circumferential groove is formed in said land so as to define said valve land space, an auxiliary fluid flow is supplied into said valve land space toward a central axis of said spool from a side opposing to said control orifice, whereby said control fluid is swirled within said valve land space so as to compensate a flow force acting on said spool, wherein said control fluid is swirled within said valve land space in such a way that an axial flow velocity component of said control fluid flow along a bottom surface of said circumferential groove is greater on said control orifice side than on an opposite side thereof.