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A fluid-handling system that, in some embodiments, includes a poppet having a body, a magnet, and a mounting member configured to secure the magnet to the body is disclosed. Additionally, a method of forming a valve is disclosed. In some embodiments, the method includes providing a poppet body for a

A fluid-handling system that, in some embodiments, includes a poppet having a body, a magnet, and a mounting member configured to secure the magnet to the body is disclosed. Additionally, a method of forming a valve is disclosed. In some embodiments, the method includes providing a poppet body for a valve, providing a magnet, and providing a mounting member configured to attach the magnet to the poppet body

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The invention claimed is: 1. A fluid-handling system, comprising: a poppet comprising: a body, comprising a head having a sealing surface configured to seal against a seating surface, and a leg extending from a downstream side of the head; a magnet; and a mounting member configured to secure the ma

The invention claimed is: 1. A fluid-handling system, comprising: a poppet comprising: a body, comprising a head having a sealing surface configured to seal against a seating surface, and a leg extending from a downstream side of the head; a magnet; and a mounting member configured to secure the magnet to the body; wherein the leg has a generally tubular shape that defines an interior volume in which both the magnet and the mounting member are disposed. 2. The system of claim 1, wherein the sealing surface defines a generally frusto-conical volume. 3. The system of claim 1, wherein the mounting member comprises an elastically deformable member configured to secure the magnet to the body. 4. The system of claim 1, wherein the mounting member comprises threads configured to secure the mounting member to the body. 5. The system of claim 1, wherein the mounting member comprises a plastically-deformable member configured to secure the magnet to the mounting member. 6. The system of claim 1, comprising an adhesive disposed between the magnet and the mounting member. 7. The system of claim 1, wherein: the body is a one-piece body made of a material that includes plastic, wherein the leg is a tubular leg, and wherein both the head and the tubular leg are rotationally symmetric about the same axis; the mounting member includes metal and comprises: a plurality of plastically deformable members extending from an upstream side of the mounting member; a generally circular-tubular sidewall with exterior threads configured to secure the mounting member to complementary threads disposed inside a tubular portion of the head; and a downstream restraint having a tool interface configured to receive torque from a tool; and the magnet is disposed within the circular-tubular sidewall of the mounting member, between the plurality of plastically deformable members and the downstream restraint. 8. The system of claim 1, comprising: a seat having an intake passage with a seating surface, wherein the seat is disposed upstream from poppet; a shoe disposed downstream from the poppet and having a repelling magnet; a guard having a shoe receptacle in which the shoe is disposed and an outlet passage. 9. The system of claim 8, wherein the shoe comprises a shock absorber. 10. The system of claim 8, wherein the shoe, the repelling magnet, and the guard have a fluid-drainage aperture. 11. The system of claim 8, comprising a compressor having a compression cylinder in fluid communication with the intake passage and a driver coupled to a piston disposed within the compression cylinder. 12. A valve, comprising: a poppet comprising: a magnet, wherein a downstream side of the magnet is substantially wider than an upstream side of the magnet; and a body disposed about the magnet, wherein the body includes a head and a leg that defines a distal surface that is downstream from the magnet. 13. The valve of claim 12, wherein the leg defines a generally frusto-conical, interior volume. 14. The valve of claim 12, comprising a shelf disposed adjacent a downstream side of the magnet. 15. The valve of claim 14, wherein the shelf includes a fillet on a downstream side of the shelf, where the shelf meets the leg. 16. The valve of claim 12, comprising a plurality of poppet receptacles and a plurality of poppets, wherein the plurality of poppets are configured to translate within a respective poppet receptacle. 17. A method of forming a valve, the method comprising: providing a poppet body for a valve; providing a magnet; providing a mounting member configured to attach the magnet to the poppet body; and providing a shelf adjacent a downstream side of the magnet. 18. The method of claim 17, wherein providing the poppet body comprises injection molding the poppet body. 19. The method of claim 17, comprising: inserting the magnet into the mounting member; and after inserting the magnet, attaching the mounting member to the poppet body. 20. The method of claim 19, wherein attaching the mounting member to the poppet body comprises engaging threads on the poppet body with complementary threads on the mounting member. 21. An apparatus, comprising: a compressor; and a valve disposed between a fluid inlet and a fluid outlet of the compressor, wherein the valve comprises: a valve member, comprising a poppet; a mounting member coupled to the valve member; and a magnet coupled to the valve member by the mounting member; wherein the poppet comprises a leg, and wherein the mounting member is disposed between the magnet and the leg. 22. The apparatus of claim 21, wherein the compressor comprises a piston. 23. A fluid-handling system, comprising: a poppet comprising: a body; a magnet; a mounting member configured to secure the magnet to the body; and an adhesive disposed between the magnet and the mounting member. 24. The system of claim 23, wherein: the body is a one-piece body made of a material that includes plastic, and wherein the body includes both a head with a sealing surface and a tubular leg extending from the downstream side of the head, wherein both the head and the tubular leg are rotationally symmetric about the same axis; the mounting member includes metal and comprises: a plurality of plastically deformable members extending from an upstream side of the mounting member; a generally circular-tubular sidewall with exterior threads configured to secure the mounting member to complementary threads disposed inside a tubular portion of the head; and a downstream restraint having a tool interface configured to receive torque from a tool; and the magnet is disposed within the circular-tubular sidewall of the mounting member, between the plurality of plastically deformable members and the downstream restraint. 25. The system of claim 23, comprising: a seat having an intake passage with a seating surface, wherein the seat is disposed upstream from poppet; a shoe disposed downstream from the poppet and having a repelling magnet; and a guard having a shoe receptacle in which the shoe is disposed and an outlet passage. 26. A fluid-handling system, comprising: a poppet comprising: a one-piece body made of a material that includes plastic, and wherein the body includes both a head with a sealing surface and a tubular leg extending from a downstream side of the head, wherein both the head and the tubular leg are rotationally symmetric about the same axis; a magnet; and a mounting member configured to secure the magnet to the body, wherein the mounting member includes metal and comprises: a plurality of plastically deformable members extending from an upstream side of the mounting member; a generally circular-tubular sidewall with exterior threads configured to secure the mounting member to complementary threads disposed inside a tubular portion of the head; and a downstream restraint having a tool interface configured to receive torque from a tool; and wherein the magnet is disposed within the circular-tubular sidewall of the mounting member, between the plurality of plastically deformable members and the downstream restraint. 27. The system of claim 26, comprising: a seat having an intake passage with a seating surface, wherein the seat is disposed upstream from poppet; a shoe disposed downstream from the poppet and having a repelling magnet; and a guard having a shoe receptacle in which the shoe is disposed and an outlet passage. 28. The system of claim 27, comprising an adhesive disposed between the magnet and the mounting member. 29. A fluid-handling system, comprising: a poppet comprising: a body; a magnet; and a mounting member configured to secure the magnet to the body; a seat having an intake passage with a seating surface, wherein the seat is disposed upstream from poppet; a shoe disposed downstream from the poppet and having a repelling magnet; and a guard having a shoe receptacle in which the shoe is disposed and an outlet passage. 30. A valve, comprising: a poppet comprising: a magnet; a body disposed about the magnet, wherein the body includes a head and a leg that defines a distal surface that is downstream from the magnet; and a shelf disposed adjacent a downstream side of the magnet.