Abstract An actuator comprising a body having a bore, a piston in said bore and having a piston rod. A system pressure gallery or passage is arranged in the body for the application of system pressure to the annular area between the piston and the piston rod, and a chamber is provided in the body for applying pressure to the other end of the piston. The chamber communicates with the system pressure passage through a fixed orifice, and with an exhaust outlet through a variable orifice controlled by a flapper disc arranged to close the end of an outlet tube. The flapper disc has on its opposite face a pressure balancing tube of the same diameter as the outlet tube and working in a bore in the piston. The pressure in this bore is equalized to the exhaust pressure and the flapper disc is controlled by the spring centered armature of a solenoid or force motor.
Inventors
👤 Ronald Bernard Walters
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-30 05:47
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/03
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
An actuator comprising a body having a bore, a piston in said bore and having a piston rod, said body including a system pressure passage arranged for the application of system pressure to the annular area between said piston and said piston rod, and a chamber for applying pressure to the other end of said piston, a fixed orifice through which said chamber communicates with said system pressure passage through said fixed orifice, and a flapper disc arranged to close the end of an outlet tube and provide an exhaust outlet through a variable orifice controlled by said flapper disc, a pressure balancing tube of the same diameter as the outlet tube on the opposite face of said flapper disc, said piston rod having a bore, the pressure balancing tube working in said bore in said piston rod, passageway means for maintaining the pressure in said last mentioned bore equal to the exhaust pressure, a solenoid having a spring centered armature controlling said flapper disc.
Claim 2
Dependent Claim
165 words
An actuator comprising a body having a bore, a piston in said bore and having a piston rod, said body including a system pressure passage arranged for the application of system pressure to the annular area between said piston and said piston rod, and a chamber for applying pressure to the other end of said piston, a fixed orifice through which said chamber communicates with said system pressure passage through said fixed orifice, and a flapper disc arranged to close the end of an outlet tube and provide an exhaust outlet through a variable orifice controlled by said flapper disc, a pressure balancing tube of the same diameter as the outlet tube on the opposite face of said flapper disc, said piston rod having a bore, the pressure balancing tube working in said bore in said piston rod, passageway means for maintaining the pressure in said last mentioned bore equal to the exhaust pressure, a solenoid having a spring centered armature controlling said flapper disc.
Claim 3
Dependent Claim
29 words
An actuator according to claim 1 in which the outlet tube has a sharp edge and the pressure balancing tube has the same outside diameter as said outlet tube.
Claim 4
Dependent Claim
12 words
An actuator according to claim 1 designed for operation with hydraulic fluid.
Claim 5
Dependent Claim
36 words
An actuator according to claim 1 in combination with an electric feed-back circuit whereby the current to the actuator solenoid is controlled in dependence on the position of the piston rod and an external demand signal.