Pressure modulation valve

A fluid pressure modulation valve, comprising:

• (a) a housing having a fluid inlet port adapted to receive a force having a related pressure Pi;
• a fluid outlet port adapted for a force output having a related pressure Po;
• and an axial channel in fluid communication with radially inwardly apertured ends of said inlet and outlet ports, said axial channel having a radius R2;
• (b) a piston, having a radius R2, radially centered about an integral with a piston rod, said piston rod having a radius R1, said piston slidably mounted in said axial channel, said piston rod having an axial range of travel extending from downstream of said apertured end of said outlet port to upstream of said apertured end of said outlet port, said piston rod being fluidly sealed within said axial channel at the upstream and downstream ends thereof;
• (c) a fluid disposed in fluid tight communication between said inlet and outlet ports and said axial channel therebetween;
• and
• (d) a selective reciprocating means including a linear motor for selectively reciprocating with a particular force F1 applied to said upstream end of said piston rod, said selective reciprocating means being responsive to external control signals, said piston rod radius R1 and said axial channel radius R2 are selected to substantially match said force F1 in accordance with the formula:
• F1=(Pi-Po)[(R2.sup.2 -R1.sup.2)]
• in which (Pi-Po) is the difference between said inlet port pressure and outlet port pressure,
• whereby upstream movement of said piston by said linear motor will co-act with said fluid to diminish the volume of said fluid available to said inlet port, and will increase the volume of fluid available to said outlet port and, further whereby, said linear motor will act to directly oppose fluidly transmitted force applied from said inlet port through said axial channel, said effects acting to reduce the fluid pressure and resultant force at said outlet port.