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A solenoid fluid control valve having a valve body containing a solenoid coil, a fluid channel, and a seat, each coaxially disposed about a central longitudinal axis of the body, and a one-piece armature of MRE material. The armature is disposed within the fluid channel and magnetically actuable to

A solenoid fluid control valve having a valve body containing a solenoid coil, a fluid channel, and a seat, each coaxially disposed about a central longitudinal axis of the body, and a one-piece armature of MRE material. The armature is disposed within the fluid channel and magnetically actuable to seal against the seat, with operation of the solenoid coil actuating the armature with respect to the seat to alter the closure state of a fluid port. Also, a fluid check valve having a first valve body part defining a seat, a fluid port, and a first portion of a fluid chamber, with the seat including a permanent magnet element disposed adjacent the fluid port proximate the fluid chamber. A one-piece armature of MRE material is disposed across the fluid port and magnetically sealable against the magnet element. The armature and magnet element are configured to create a preselected magnetization offset pressure portion of a valve cracking pressure.

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1. A self-actuating fluid check valve comprising: a first valve body part defining a seat, a fluid port, and a first portion of a fluid chamber, the seat including a permanent magnet element disposed adjacent the fluid port proximate the fluid chamber;a second valve body part defining a second porti

1. A self-actuating fluid check valve comprising: a first valve body part defining a seat, a fluid port, and a first portion of a fluid chamber, the seat including a permanent magnet element disposed adjacent the fluid port proximate the fluid chamber;a second valve body part defining a second portion of the fluid chamber; anda one-piece armature comprising an elastomer matrix containing a dispersed particulate ferromagnetic filler, the one-piece armature being disposed across the fluid port and magnetically sealable against the permanent magnet element of the seat;the one-piece armature and the permanent magnet element being configured to create a preselected magnetization offset pressure portion of a valve cracking pressure, wherein the valve cracking pressure includes no mechanically induced forces. 2. The self-actuating fluid check valve of claim 1, wherein the elastomer matrix is a synthetic rubber, and the ferromagnetic filler is a particulate strontium ferrite present in a range about 70% to about 84% by weight. 3. The self-actuating fluid check valve of claim 2, wherein the combined elastomer matrix and dispersed particulate filler have a Shore hardness of about 55 to about 85 on the Shore A scale. 4. The self-actuating fluid check valve of claim 1, wherein the permanent magnet element is an annulus of permanently magnetized material disposed coaxially about the fluid port. 5. The self-actuating fluid check valve of claim 1, wherein the valve is a disk valve, and the one-piece armature is configured as a disk. 6. The self-actuating fluid check valve of claim 5, wherein at least one of the first and second body portions includes guide elements projecting from the periphery of the fluid chamber into the fluid chamber, and the one-piece armature includes complementary guide elements engaging the projecting guide elements to retain the one-piece armature in position across the fluid port. 7. A self-actuating fluid check valve comprising: a first valve body part defining a seat, a fluid port, and a first portion of a fluid chamber, the seat including a permanent magnet element disposed adjacent the fluid port proximate the fluid chamber;a second valve body part defining a second portion of the fluid chamber; anda one-piece armature comprising an elastomer matrix containing a dispersed particulate ferromagnetic filler, the one-piece armature being disposed across the fluid port and magnetically sealable against the permanent magnet element of the seat;the one-piece armature and the permanent magnet element being configured to create a preselected magnetization offset pressure portion of a valve cracking pressure, wherein the valve is an umbrella valve, and the one-piece armature is configured as an umbrella element having an umbrella stem, with the one-piece armature umbrella stem being secured across the fluid port through engagement of the fluid port with the umbrella stem. 8. The self-actuating fluid check valve of claim 7, wherein the elastomer matrix is a synthetic rubber, and the ferromagnetic filler is a particulate strontium ferrite present in a range about 70% to about 84% by weight. 9. The self-actuating fluid check valve of claim 8, wherein the combined elastomer matrix and dispersed particulate filler have a Shore hardness of about 55 to about 85 on the Shore A scale. 10. The self-actuating fluid check valve of claim 7, wherein the permanent magnet element is an annulus of permanently magnetized material disposed coaxially about the fluid port. 11. A self-actuating fluid check valve comprising: a first valve body part defining a seat, a fluid port, and a first portion of a fluid chamber, the seat including a permanent magnet element disposed adjacent the fluid port proximate the fluid chamber;a second valve body part defining a second portion of the fluid chamber; anda one-piece armature comprising an elastomer matrix containing a dispersed particulate ferromagnetic filler, the one-piece armature being disposed across the fluid port and magnetically sealable against the permanent magnet element of the seat;the one-piece armature and the permanent magnet element being configured to create a preselected magnetization offset pressure portion of a valve cracking pressure, wherein the valve cracking pressure consists essentially of the preselected magnetization offset pressure. 12. The self-actuating fluid check valve of claim 11, wherein the elastomer matrix is a synthetic rubber, and the ferromagnetic filler is a particulate strontium ferrite present in a range about 70% to about 84% by weight. 13. The self-actuating fluid check valve of claim 12, wherein the combined elastomer matrix and dispersed particulate filler have a Shore hardness of about 55 to about 85 on the Shore A scale. 14. The self-actuating fluid check valve of claim 11, wherein the permanent magnet element is an annulus of permanently magnetized material disposed coaxially about the fluid port. 15. The self-actuating fluid check valve of claim 11, wherein the valve is a disk valve, and the one-piece armature is configured as a disk. 16. The self-actuating fluid check valve of claim 15, wherein at least one of the first and second body portions includes guide elements projecting from the periphery of the fluid chamber into the fluid chamber, and the one-piece armature includes complementary guide elements engaging the projecting guide elements to retain the one-piece armature in position across the fluid port.