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A double diaphragm pump including a pump housing, first and second pump diaphragms, an inlet manifold, an outlet manifold, and an air motor. The air motor includes a spool valve having a valve housing, an insert surrounded by the valve housing, and a spool. The valve housing and the insert cooperate

A double diaphragm pump including a pump housing, first and second pump diaphragms, an inlet manifold, an outlet manifold, and an air motor. The air motor includes a spool valve having a valve housing, an insert surrounded by the valve housing, and a spool. The valve housing and the insert cooperate to at least partially define a valve chamber, and the spool is slidably positioned within the valve chamber. The spool includes a seal engaging an inner surface of the insert and delimiting the valve chamber into valve subchambers. Movement of the spool within the valve chamber selectively communicates pressurized fluid to one of the diaphragms to move the associated diaphragm, thereby pumping fluid through the pump.

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1. A spool valve comprising:a valve housing formed of a reinforced polymer and having an inner surface, the inner surface having a first surface roughness and at least partially defining a generally cylindrical valve chamber; a first insert formed of a non-reinforced polymer and including an inner s

1. A spool valve comprising:a valve housing formed of a reinforced polymer and having an inner surface, the inner surface having a first surface roughness and at least partially defining a generally cylindrical valve chamber; a first insert formed of a non-reinforced polymer and including an inner surface at least partially defining the valve chamber; a second insert formed of a non-reinforced polymer and including an inner surface at least partially defining the valve chamber, the inner surface of the first insert and the inner surface of the second insert having a second surface roughness, the second surface roughness being less than the first surface roughness, the housing being molded around the first insert and the second insert; and a spool slidably positioned within the valve chamber and including a first seal engaging the inner surface of the first insert, and a second seal engaging the inner surface of the second insert, the first and second seals delimiting the valve chamber into valve subchambers. 2. The spool valve of claim 1, wherein the valve housing defines a fluid inlet opening communicating with at least one of the valve subchambers.3. The spool valve of claim 1, wherein the valve housing defines a fluid outlet opening communicating with at least one of the valve subchambers.4. The spool valve of claim 3, further comprising a valve plate overlying the outlet opening and defining a plurality of orifices, and a valve insert slidably engaging the valve plate and carried by the spool to selectively afford fluid communication between at least one of the valve subchambers and at least one of the orifices in response to sliding movement of the spool.5. The spool valve of claim 1, wherein the spool is movable between first and second positions, and wherein the first and second seals substantially continuously engage the inner surfaces of the first and second inserts respectively during movement of the spool between the first and second positions.6. The spool valve of claim 1, wherein the housing is injection molded around the first and second inserts and completely surrounds the inserts.7. The spool valve of claim 1, wherein the valve housing includes a valve block surrounding the first insert and cooperating therewith to define a first portion of the valve chamber, and a valve cap surrounding the second insert and cooperating therewith to define a second portion of the valve chamber, and wherein the valve cap is securable to the valve block to define the valve chamber.8. The spool valve of claim 1, wherein the housing is generally tubular, and wherein the inserts are received by open ends of the housing to close the valve chamber.9. The spool valve of claim 1, wherein the reinforced polymer includes glass fibers.10. The spool valve of claim 1, wherein the spool includes an outer surface having a third surface roughness, the third surface roughness being greater than the second surface roughness.11. A spool valve comprising:a valve housing formed of a polymer and at least partially defining a generally cylindrical valve chamber; a first insert formed of a polymer and including an inner surface at least partially defining the valve chamber; a second insert formed of a polymer and including an inner surface at least partially defining the valve chamber, the housing being molded around and sealingly engaging the first insert and the second insert; and a spool slidably positioned within the valve chamber and including a first seal engaging the inner surface of the first insert, and a second seal engaging the inner surface of the second insert, the first and second seals delimiting the valve chamber into valve subchambers. 12. The spool valve of claim 11, wherein the valve housing defines a fluid inlet opening communicating with at least one of the valve subchambers.13. The spool valve of claim 11, wherein the valve housing defines a fluid outlet opening communicating with at least one of the valve subchambers.14. The spool valve of claim 13, further comprising a valve plate overlying the outlet opening and defining a plurality of orifices, and a valve insert slidably engaging the valve plate and carried by the spool to selectively afford fluid communication between at least one of the valve subchambers and at least one of the orifices in response to sliding movement of the spool.15. The spool valve of claim 11, wherein the spool is movable between first and second positions, and wherein the first and second seals substantially continuously engage the inner surfaces of the first and second inserts respectively during movement of the spool between the first and second positions.16. The spool valve of claim 11, wherein the housing is injection molded around the first and second inserts.17. The spool valve of claim 11, wherein the valve housing includes a valve block surrounding the first insert and cooperating therewith to define a first portion of the valve chamber, and a valve cap surrounding the second insert and cooperating therewith to define a second portion of the valve chamber, and wherein the valve cap is securable to the valve block to define the valve chamber.18. The spool valve of claim 11, wherein the housing is generally tubular, and wherein the inserts are received by open ends of the housing to close the valve chamber.19. The spool valve of claim 11, wherein the polymer of the housing is reinforced with glass fibers.20. The spool valve of claim 11, wherein the inserts are formed of a fiber-matrix composite material.21. The spool valve of claim 20, wherein the fibers of the fiber matrix material are bound together with an epoxy material.22. The spool valve of claim 11, wherein the inserts are formed from wound glass fibers.23. The spool valve of claim 11, wherein the housing has an inner surface having a first surface roughness, and wherein the inner surface of the first insert and the inner surface of the second insert have a second surface roughness, the second surface roughness being less than the first surface roughness.24. The spool valve of claim 23, the spool includes an outer surface having a third surface roughness, the third surface roughness being greater than the second surface roughness.25. A spool valve comprising:a valve housing formed of a reinforced polymer and having an inner surface, the inner surface having a first surface roughness and at least partially defining a generally cylindrical valve chamber; an insert formed of a non-reinforced polymer and including an inner surface at least partially defining the valve chamber, the inner surface of the insert having a second surface roughness, the second surface roughness being less than the first surface roughness, the housing being molded around the insert; and a spool slidably positioned within the valve chamber and including a seal engaging the inner surface of the insert, the seal delimiting the valve chamber into valve subchambers. 26. The spool valve of claim 25, wherein the valve housing defines a fluid inlet opening communicating with at least one of the valve subchambers.27. The spool valve of claim 25, wherein the valve housing defines a fluid outlet opening communicating with at least one of the valve subchambers.28. The spool valve of claim 27, further comprising a valve plate overlying the outlet opening and defining a plurality of orifices, and a valve insert slidably engaging the valve plate and carried by the spool to selectively afford fluid communication between at least one of the valve subchambers and at least one of the orifices in response to sliding movement of the spool.29. The spool valve of claim 25, wherein the spool is movable between first and second positions, and wherein the seal substantially continuously engages the inner surface of the insert during movement of the spool between the first and second positions.30. The spool valve of claim 25, wherein the housing is injection molded around the insert.31. The spool valve of claim 25, wherein the reinforced polymer includes glass fibers.32. The spool valve of claim 25, wherein the spool includes an outer surface having a third surface roughness, the third surface roughness being greater than the second surface roughness.