A ball valve is provided for threaded connection to a separable component 72 having male threads 74 . A housing 10 contains a ball 12 selectively rotatable for passing fluid through the housing, and a flange member 20 threadably secured to the valve housing. A stop ring 16 is positioned outward of the valve housing and engages the flange member. A coupling 20 is threadably secured to the stop ring and includes female threads for engagement with male threads on the separable component.
1. A ball valve for threaded connection to a check valve having a male thread and a stem head configured for mating with a surface of a ball when the check valve is closed, comprising:
a valve housing having a first fluid end and a second component receiving end, the valve housing containing the ball rotatable for selectively passing fluid through the valve housing and between the first fluid end and the second component receiving end;
a valve body stem hub secured to the valve housing for receiving a stem to rotate the ball;
a flange member secured to and extending radially outward from the valve housing and including a stop surface thereon positioned radially outward of the valve housing and supporting a first seal for sealing with the ball, the stop surface being positioned between an outer surface of the ball and a second seal positioned between the flange member and the check valve;
a stop ring positioned outward of the valve housing and engageable with the stop surface on the flange member; and
a coupling axially connected to the stop ring, the coupling rotatable with respect to the valve housing and the flange member, the coupling including female threads for engagement with the male threads on the check valve, the coupling female threads having a thread diameter less than a minimum diameter of the stop surface, such that rotation of the coupling onto the check valve forces the stop ring into engagement with the stop surface, the coupling female threads being opposite the stop ring with respect to the stop surface.
2. A ball valve as defined in claim 1 , wherein the coupling is threadably connected to the stop ring.
3. A ball valve as defined in claim 2 , wherein the coupling is pinned with respect to the stop ring.
4. A ball valve as defined in claim 1 , wherein the flange member is threadably connected to the valve housing.
5. A ball valve as defined in claim 1 , wherein the stop ring and the coupling are axially connected by a plurality of ball locking members positioned within a race in the stop ring and the coupling.
6. A ball valve for threaded connection to a check valve having a male thread and a stem head configured for mating with a surface of a ball when the check valve is closed, comprising:
a valve housing having a first fluid end and a second component receiving end, the valve housing containing the ball selectively rotatable for passing fluid through the valve housing;
a valve body stem hub secured to the valve housing for receiving a stem to rotate the ball;
a flange member threadably secured to the valve housing and including a stop surface thereon positioned radially outward of the valve housing;
a stop ring positioned outward of the valve housing and engageable with the stop surface on the flange member; and
a coupling axially connected to the stop ring, the coupling rotatable with respect to the valve housing and the flange member, the coupling including female threads for engagement with the male threads on the check valve, such that rotation of the coupling onto the check valve forces the stop ring into engagement with the stop surface, the coupling female threads having a thread diameter less than a minimum diameter of the stop surface, and the stop ring rotates with the coupling with respect to the valve housing.
7. A ball valve as defined in claim 6 , wherein the stop ring and the coupling are axially connected by a plurality of ball locking members positioned within a race in the stop ring and the coupling.
8. A ball valve as defined in claim 6 , wherein the stop ring is threaded to the coupling.
9. A ball valve as defined in claim 6 , wherein the stop ring is connected to the coupling by one of a bolt and a pin.
10. A ball valve as defined in claim 6 , wherein the flange member supports a first seal for sealing with the ball; and
a second seal between the flange member and the check valve and the stop surface is positioned between an outer surface of the ball and the second seal between the flange member and the check valve.
11. A ball valve as defined in claim 6 , wherein
the flange member is threadably connected to the valve housing; and
the flange member is pinned with respect to the valve housing.
12. A ball valve for threaded connection to a check valve having a male thread and a stem head configured for mating with a surface of a ball when the check valve is closed, comprising:
a ball valve housing containing the ball rotatable by a stem passing through the ball valve housing;
a valve body stem hub secured to the ball valve housing for receiving the stem to rotate the ball;
a flange member secured to and extending outward from the ball valve housing and supporting a seal for sealing with the ball;
a stop ring positioned outward of the ball valve housing and engageable with a stop surface on the flange member;
a coupling axially secured to the ball valve housing, the coupling being rotatable with respect to the ball valve housing, the coupling including female threads for engagement with the male threads on the check valve, the coupling female threads having a thread diameter less than a minimum diameter of the stop surface, such that rotation of the coupling onto the check valve forces the stop ring into engagement with the stop surface; and
a seal between the flange member and the check valve.
13. A ball valve as defined in claim 12 , wherein the stop ring and the coupling are axially connected by a plurality of ball locking members positioned within a race in the stop ring and the coupling.
14. A ball valve as defined in claim 12 , wherein the stop ring rotates with the coupling with respect to the ball valve housing.
15. A ball valve as defined in claim 12 , wherein the stop surface is positioned between an outer surface of the ball and the seal between the flange member and the check valve.