Full-root-radius-threaded wing nut having increased wall thickness
A hammer union includes a female sub; a male sub; and a wing nut that is concentrically disposed about the female and male subs. The wing nut includes a body having first and second end surfaces, and an exterior surface extending therebetween; a passage extending through the body from the first to second end surface that defines an interior surface of the body; an internal shoulder formed by the interior surface; an internal threaded connection that extends from the first end surface and towards the internal shoulder; and lugs extending radially from the exterior surface. The body has a wall thickness defined between the interior and exterior surfaces, with a greater wall thickness at the internal shoulder than at the first end surface; the internal threaded connection has a full-root radius; and a lug that extends along the axial length of the body.
1. A hammer union, the hammer union comprising:
a threaded female sub;
a male sub;
a plurality of retainer segments concentrically disposed about the male sub; and
a threaded wing nut that is concentrically disposed about each of the threaded female sub, the male sub, and the plurality of retainer segments to couple the threaded female sub to the male sub;
wherein the threaded wing nut comprises:
a body having an axial length defined between first and second end surfaces, the body having an exterior surface extending between the first and second end surfaces;
a passage axially extending through the body from the first end surface to the second end surface, wherein the passage defines an interior surface of the body;
a first internal shoulder formed by the interior surface of the body that defines a portion of the passage;
an internal threaded connection formed by the interior surface that extends from the first end surface and towards the first internal shoulder; and
a plurality of circumferentially-spaced lugs extending radially from the exterior surface of the body;
wherein the plurality of retainer segments is radially positioned between the male sub and the threaded wing nut such that the threaded wing nut is concentrically disposed about the male sub but the interior surface of the body of the wing nut is spaced radially from the male sub;
wherein the body has a variable wall thickness defined between the interior surface of the body and the exterior surface of the body, with the variable wall thickness at the first internal shoulder being greater than the variable wall thickness at the first end surface;
wherein the internal threaded connection includes a first slanted surface; a second opposing slanted surface; and a curved surface that extends from the first slanted surface and to the second opposing slanted surface; and
wherein a first lug of the plurality of lugs extends along the entirety of the axial length of the body.
2. The hammer union of claim 1 ,
wherein the variable wall thickness at the first internal shoulder being greater than the variable wall thickness at the first end surface results in increased rigidity of the body;
wherein the internal threaded connection including the curved surface that extends from the first slanted surface and to the second opposing slanted surface reduces the amount of stress exerted on the internal threaded connection; and
wherein the first lug of the plurality of lugs extending along the entirety of the axial length of the body increases the durability of the threaded wing nut.
3. The hammer union of claim 1 , wherein the variable wall thickness at the first internal shoulder is about 0.75 inches and the variable wall thickness at the first end surface is about 0.6 inches.
4. The hammer union of claim 1 ,
wherein the exterior surface of the body defines an outer circumference and an outer diameter;
wherein the first lug of the plurality of lugs defines a width measured along a line that is tangential to the outer circumference of the body; and
wherein the ratio of the outer diameter of the body to the width of the first lug is between about 2.5 and about 5.5.
5. The hammer union of claim 4 ,
wherein the outer diameter of the body is about seven inches; and
wherein the width of the first lug is about two inches such that the ratio of the outer diameter of the body to the width of the first lug is about 3.5.
6. The hammer union of claim 1 ,
wherein the threaded wing nut further comprises a second internal shoulder formed by the interior surface of the body;
wherein the second internal shoulder defines another portion of the passage that is axially positioned between the internal threaded connection and the first internal shoulder; and
wherein the variable wall thickness at the first internal shoulder is greater than the variable wall thickness at the second internal shoulder.
7. The hammer union of claim 1 , wherein the internal threaded connection of the wing nut is adapted to engage a corresponding external threaded connection of the threaded female sub to couple the threaded female sub to the male sub.