Valve assembly

1. A valve assembly comprising:

a housing having an inlet and an outlet spaced from each other, a first chamber defining said inlet, a second chamber defining said outlet, and a valve seat disposed between said first and second chambers, wherein fluid communicates between said first and second chambers;

a valve head disposed in said housing and moveable relative to said housing between an open position spaced from said valve seat and a closed position engaged with said valve seat;

a valve stem coupled to said valve head and being rotatably and reciprocally movable for moving said valve head between said open and closed positions;

a retainer plate coupled to said valve head;

a valve seal disposed between said valve head and said retainer plate; and

wherein said valve head includes an integrally formed rivet that secures said retainer plate to said valve head, thereby retaining said valve seal to said valve head.

2. The valve assembly as set forth in claim 1 wherein said rivet has an enlarged head at a distal end of said rivet.

3. The valve assembly as set forth in claim 2 wherein said valve head includes a front portion, said valve seal being disposed adjacent said front portion.

4. The valve assembly as set forth in claim 3 wherein said rivet includes a post extending from said front portion of said valve head and said enlarged head extends from said post and is spaced from said front portion of said valve head.

5. The valve assembly as set forth in claim 4 wherein said retainer plate includes a hole to receive said post and said retainer plate is disposed between said enlarged head and said front portion.

6. The valve assembly as set forth in claim 1 wherein said rivet is formed by an orbital forming process such that said rivet cooperates with said retainer plate to secure said retainer plate to said valve head.

7. A valve assembly comprising:

a housing having a first chamber, a second chamber, and a valve seat disposed between said first and second chambers;

a valve head disposed in said housing and moveable relative to said housing between an open position spaced from said valve seat and a closed position engaged with said valve seat, said valve head having a front portion and a rear portion;

a valve stem coupled to said rear portion of said valve head and being rotatably and reciprocally movable for moving said valve head between said open and closed positions;

wherein said valve head includes a post extending from said front portion and integrally formed with the valve head;

a valve seal including a hole receiving said post and being disposed adjacent said front portion;

a retainer plate having a hole to receive said post and being disposed adjacent said valve seal; and

wherein said post has an enlarged head at a distal end of said post spaced from said front portion to secure said retainer plate to said valve head, thereby retaining said valve seal to said valve head.

8. A method of assembling a valve assembly, said method comprising the steps of:

providing a housing having an inlet and an outlet spaced from each other, a first chamber defining the inlet, a second chamber defining the outlet, and a valve seat disposed between the first and second chambers, wherein fluid communicates between the first and second chambers;

disposing a valve head in the housing and being moveable relative to the housing between an open position spaced from the valve seat and a closed position engaged with the valve seat;

coupling a valve stem to the valve head and being rotatably and reciprocally movable for moving the valve head between the open and closed positions;

disposing a valve seal adjacent the valve head;

disposing a retainer plate adjacent the valve seal; and

forming a rivet integrally with the valve head and securing the retainer plate to the valve head, thereby retaining the valve seal to the valve head.

9. The method as set forth in claim 8 including the step of extending a post of the rivet from a front portion of the valve head.

10. The method as set forth in claim 9 including the step of receiving the post in a hole of the valve seal.

11. The method as set forth in claim 10 including the step of receiving the post in a hole of the retainer plate.

12. The method as set forth in claim 11 including the step of enlarging the post at a distal end of said post to form an enlarged head.

13. The method as set forth in claim 8 including the step of forming the rivet by an orbital forming process such that the rivet cooperates with the retainer plate to secure the retainer plate to the valve head.

14. A method of assembling a valve assembly, said method comprising the steps of:

providing a housing having an inlet and an outlet spaced from each other, a first chamber defining the inlet, a second chamber defining the outlet, and a valve seat disposed between the first and second chambers, wherein fluid communicates between the first and second chambers;

disposing a valve head in the housing and being moveable relative to the housing between an open position spaced from the valve seat and a closed position engaged with the valve seat, the valve head having a front portion and a rear portion;

coupling a valve stem to the rear portion of the valve head and being rotatably and reciprocally movable for moving the valve head between the open and closed positions;

extending a post from a front portion of the valve head;

disposing a valve seal having a hole adjacent the front portion of the valve head such that the post extends through the hole of the valve seal;

disposing a retainer plate having a hole adjacent the valve seal such that the post extends through the hole of the retainer plate; and

enlarging the post at a distal end of the post to form an enlarged head by orbital forming to form a rivet integrally with the valve head and securing the retainer plate to the valve head, thereby retaining the valve seal to the valve head.