초록 ▼

Pressure fluid operated servo system method and apparatus including a servo valve operable by an input signal to effect a system output movement; and which servo valve is responsive to the time rate of input signal receipt to vary a gain ratio of system output magnitude compared to input signal valu

Pressure fluid operated servo system method and apparatus including a servo valve operable by an input signal to effect a system output movement; and which servo valve is responsive to the time rate of input signal receipt to vary a gain ratio of system output magnitude compared to input signal value; and method of making such a servo valve.

대표청구항 ▼

The method of making a pressure balanced servo valve apparatus of closed-center type comprising the steps of: (a) forming a poppet member work piece having a body portion of outer diameter d2 and one of a head portion end or seat portion end having a respective outer diameter (d3 or d4) exceeding d2

The method of making a pressure balanced servo valve apparatus of closed-center type comprising the steps of: (a) forming a poppet member work piece having a body portion of outer diameter d2 and one of a head portion end or seat portion end having a respective outer diameter (d3 or d4) exceeding d2; (b) forming a seat member having an aperture therethrough of inner diameter d1 larger than diameter d2 and less than diameter (d3 or d4) and defining a seat circumscribing said aperture and substantially of sealing diameter d1; (c) uniting the products of steps (a) and (b) by inserting said poppet member work piece body portion through said aperture; (d) expanding said poppet member work piece body portion at the end thereof opposite said one end to define the other of said head portion end or seat portion end having a respective outer diameter (d3 or d4) also exceeding d2; and (e) utilizing steps a-d to permanently retain said poppet member and said seat member in relatively movable cooperable union whereby said seat member and said poppet member are sealingly and movably cooperable at said head portion and said seat to selectively control fluid flow therebetween.