Union nut with lock member

1. A union nut for connecting an end of a threaded pipe having threading to an end of a flanged pipe having a flange, said union nut comprising:

a body defining an inner bore having a longitudinal axis; said body comprising:

a thread retaining end for engaging a threaded pipe;

threads formed on a surface of the body adapted to mate at the thread retaining end with threads on a threaded pipe;

a flange retaining end for engaging a flanged pipe; and

a partial collar projecting radially inward on the body at the flange retaining end and defining an aperture for receiving the flange of a flanged pipe such that said partial collar partially retains the received flange within said body; and

a flange lock member adapted to be engaged with said body such that, when engaged, said flange lock member and said flange retaining end cooperate to fully retain said received pipe flange within said inner bore and to be able to maintain said received pipe flange in connection with said threaded pipe, and wherein said lock member engages with said flange retaining end by sliding in a direction perpendicular to said longitudinal axis of said inner bore.

2. The union nut of claim 1 further comprising:

a gasket disposed in the inner bore between said pipe flange and said threaded pipe.

3. The union nut of claim 1 , wherein said threads are formed on an inner surface of the body and comprise nut threads adapted to mate with exterior threading on the threaded pipe.

4. The union nut of claim 1 , wherein the body is a generally cylindrical body.

5. The union nut of claim 1 , wherein the thread retaining end comprises an outer surface and an inner surface comprising the threads.

6. The union nut of claim 5 , wherein the partial collar projects radially inward beyond said inner surface, and wherein the lock member and the partial collar cooperate to retain the received flange.

7. The union nut of claim 6 , wherein said lock member and said partial collar combine to form a circular collar for retaining the received flange.

8. The union nut of claim 1 , wherein the flange retaining end comprises a first cooperative alignment member and the flange lock member comprises a second cooperative alignment member, wherein said first and second cooperative alignment members are adapted to cooperate to align the flange lock member with the flange retaining end, such that the flange lock member engages with the flange retaining end by sliding in the direction perpendicular to the longitudinal axis and resists disengagement by forces not perpendicular to said axis.

9. The union nut of claim 8 , wherein the thread retaining end comprises a first detent member and the flange lock member comprises a second detent member, wherein the first and second detent members are adapted to engage.

10. The union nut of claim 1 , wherein the flange lock member is adapted to be removably engaged with said body.

11. In combination:

a flanged pipe comprising an end comprising a flange;

a threaded pipe comprising an end comprising a surface comprising pipe threading;

a union nut connecting said flanged pipe to said threaded pipe, said union nut comprising:

a body defining an inner bore having a longitudinal axis; said body comprising:

a thread retaining end for engaging the threaded pipe;

threads formed on a surface of the body adapted to mate with the pipe threading of the threaded pipe;

a flange retaining end for engaging the flanged pipe; and

a partial collar projecting radially inward on the body at the flange retaining end and defining an aperture for receiving the flange of the flanged pipe such that said partial collar partially retains the received flange within said body; and

a flange lock member adapted to be engaged with said body such that, when engaged, said flange lock member and said flange retaining end cooperate to fully retain said received flange within said inner bore and to be able to maintain said received flange in connection with said threaded pipe, and wherein said lock member engages with said flange retaining end by sliding in a direction perpendicular to said longitudinal axis of said inner bore.

12. The combination of claim 11 further comprising:

a gasket disposed in the inner bore between said flange and said threaded pipe.

13. The combination of claim 11 , wherein said threads are formed on an inner surface of the body and comprise nut threads adapted to mate with exterior threading on the threaded pipe.

14. The combination of claim 11 , wherein the body is a generally cylindrical body.

15. The combination of claim 11 , wherein the thread retaining end comprises an outer surface and an inner surface comprising the threads.

16. The combination of claim 15 , wherein the partial collar projects radially inward beyond said inner surface, and wherein the lock member and the partial collar cooperate to retain the received flange.

17. The combination of claim 16 , wherein said lock member and said partial collar combine to form a circular collar for retaining the received flange.

18. The combination of claim 11 , wherein the flange retaining end comprises a first cooperative alignment member and the flange lock member comprises a second cooperative alignment member, wherein said first and second cooperative alignment members are adapted to cooperate to align the flange lock member with the flange retaining end, such that the flange lock member engages with the flange retaining end by sliding in the direction perpendicular to the longitudinal axis and resists disengagement by forces not perpendicular to said axis.

19. The combination of claim 11 , wherein the thread retaining end comprises a first detent member and the flange lock member comprises a second detent member, wherein the first and second detent members are adapted to engage.

20. The combination of claim 11 , wherein the flange lock member is adapted to be removably engaged with said body.