Check valve with nylon cage insert

1. A check valve comprises:

a cylindrical housing member comprising an interior, an entry end and an exit end, where a longitudinal axis is defined between the entry end and the exit end and a housing bore extends axially through the interior from the entry end to the exit end;

a cage assembly containment portion defined within the cylindrical housing member, wherein the cage assembly containment portion is bounded between a first circumferential shoulder and a second circumferential shoulder;

a cage assembly disposed within the cage assembly containment portion, wherein the cage assembly comprises a valve seat, a spacer member, and a nylon insert, the nylon insert comprising a fluid inlet end and a fluid outlet end, the fluid outlet end comprising at least one ball stop member, wherein the valve seat is urged against the first circumferential shoulder by, in respective order, the spacer member, the nylon insert, and the second circumferential shoulder which urges the nylon insert against the spacer member;

a ball travel section defined between the valve seat and the ball stop member; and

a ball disposed in the ball stop section.

2. The check valve of claim 1 wherein the fluid inlet end comprises a fluid inlet end scalloped profile.

3. The check valve of claim 2 wherein the fluid inlet end scalloped profile comprises three major lobes.

4. The check valve of claim 3 wherein a minor lobe is positioned between each of the three major lubes of the fluid inlet end scalloped profile.

5. The check valve of claim 4 comprising three ball stop members, wherein each ball stop member is axially adjacent to a minor lobe.

6. The check valve of claim 1 wherein the fluid outlet end comprises a fluid outlet end scalloped profile.

7. The check valve of claim 6 wherein the fluid outlet end scalloped profile comprises three major lobes.

8. The check valve of claim 7 wherein a minor lobe is positioned between each of the three major lobes.

9. The check valve of claim 1 wherein the fluid inlet end comprises a fluid end scalloped profile and the fluid outlet end comprises a fluid outlet end scalloped profile.

10. The check valve of claim 9 wherein the fluid inlet end scalloped profile comprises three major lobes and the fluid outlet end scalloped profile comprises three major lobes.

11. The check valve of claim 10 wherein a minor lobe is positioned between each of the three major lobes at the fluid inlet end.

12. The check valve of claim 11 wherein a minor lobe is positioned between each of the three major lobes at the fluid outlet end.

13. The check valve of claim 12 wherein each of the minor lobes positioned at the fluid inlet end is axially adjacent to a corresponding minor lobe in the fluid outlet end.

14. A check valve comprises:

a cylindrical housing member comprising a first section and a threadably attached second section, the first section having an entry end and a first section interior, the second section having a second section interior and an exit end, where a longitudinal axis is defined between the entry end and the exit end and a housing bore extends axially through the first section interior and the second section interior;

an inwardly extending first circumferential shoulder disposed in the first interior section and an inwardly extending second circumferential shoulder disposed in the second interior section;

a cage assembly containment portion defined within the cylindrical housing member, wherein the cage assembly containment portion is bounded between the first circumferential shoulder and the second circumferential shoulder;

a cage assembly disposed within the cage assembly containment portion, wherein the cage assembly comprises a valve seat, a spacer member, and a nylon insert, the nylon insert comprising a fluid inlet end and a fluid outlet end, the fluid outlet end comprising at least one ball stop member, wherein the valve seat is urged against the first circumferential shoulder by, in respective order, the spacer member, the nylon insert, and the second circumferential shoulder which urges the nylon insert against the spacer member as the second section is threadably attached to the first section;

a ball travel section defined between the valve seat and the ball stop member; and

a ball disposed in the ball stop section.

15. The check valve of claim 14 comprising a fluid weep structure between the first section and the second section, wherein the fluid weep structure permits an escape of trapped fluid until the first section and the second section are tightened to a proper torque.

16. The check valve of claim 14 wherein the fluid inlet end comprises a fluid inlet end scalloped profile.

17. The check valve of claim 16 wherein the fluid inlet end scalloped profile comprises three major lobes.

18. The check valve of claim 17 wherein a minor lobe is positioned between each of the three major lubes of the fluid inlet end scalloped profile.

19. A check valve comprises:

a cylindrical housing member comprising a first section and a threadably attached second section, the first section having an entry end and a first section interior, the second section having a second section interior and an exit end, where a longitudinal axis is defined between the entry end and the exit end and a housing bore extends axially through the first section interior and the second section interior;

an inwardly extending first circumferential shoulder disposed in the first section interior and an inwardly extending second circumferential shoulder disposed in the second section interior, the first circumferential shoulder having a first surface perpendicular to the longitudinal axis and the second circumferential shoulder having a second surface perpendicular to the longitudinal axis;

a cage assembly containment portion defined within the cylindrical housing member, wherein the cage assembly containment portion is bounded between the first circumferential shoulder and the second circumferential shoulder;

a cage assembly disposed within the cage assembly containment portion, wherein the cage assembly comprises a valve seat, a spacer member, and a nylon insert, the nylon insert comprising a fluid inlet end and a fluid outlet end, the fluid outlet end comprising at least one ball stop member, wherein the valve seat is urged against the first surface of the first circumferential shoulder by, in respective order, the spacer member, the nylon insert, and the second circumferential shoulder which urges the nylon insert against the spacer member as the second section is threadably attached to the first section;

a ball travel section defined between the valve seat and the ball stop member; and

a ball disposed in the ball stop section.

20. The check valve of claim 19 comprising a fluid weep structure between the first section and the second section, wherein the fluid weep structure permits an escape of trapped fluid until the first section and the second section are tightened to a proper torque.