Valve assembly for hydraulic fracturing pump
A valve head assembly for a hydraulic fracturing pump. The valve head assembly includes a valve body attached to a valve leg assembly with backward swept or delta shaped legs. Each leg is attached to a main leg shaft which extends along a main axis. Each leg has a first leg segment and a second leg segment. The first leg segment has a first end that attaches to a distal end of the main leg shaft and extends along a first leg segment axis back towards the valve body. The second end of the first leg segment attaches to the second leg segment which extends along a second leg segment axis that is substantially parallel with but spaced apart from the main axis. The first leg segment may form an angle between the main axis and the first leg segment axis that is between approximately 10 and 60 degrees.
1. A valve head assembly comprising: a valve body; and a valve leg assembly attached to the valve body, the valve leg assembly comprising a main leg shaft having a first end and a second end and extending along a main axis, and at least three legs extending from the main leg shaft, wherein the first end of the main leg shaft is attached to the valve body, wherein each leg has a first leg segment and a second leg segment, the first leg segment having a first end and a second end and extending along a first leg segment axis, wherein the first end of the first leg segment attaches to the main leg shaft and the first leg segment extends back towards the first end of the main leg shaft, the second leg segment having a first end and a second end and extending along a second leg segment axis, wherein the second end of the first leg segment attaches to the second leg segment and the second leg segment axis is parallel with but spaced apart from the main axis.
2. The valve head assembly of claim 1 , wherein the first leg segment extends back towards the first end of the main leg shaft so as to form an angle θ 1 between the main axis and the first leg segment axis and wherein the angle θ 1 is between 10 and 60 degrees.
3. The valve head assembly of claim 1 , wherein the second end of the first leg segment attaches to the second leg segment so as to form an angle θ 2 between the first leg segment axis and the second leg segment axis, wherein the angle θ 2 is between 10 and 60 degrees.
4. The valve head assembly of claim 1 , wherein the first leg segment extends back towards the first end of the main leg shaft so as to form an angle θ 1 between the main axis and the first leg segment axis; wherein the second end of the first leg segment attaches to the second leg segment so as to form an angle θ 2 between the first leg segment axis and the second leg segment axis; and wherein the angle θ 1 is the same as the angle θ 2 .
5. The valve head assembly of claim 1 , wherein the first leg segment is linear and the second leg segment is linear.
6. The valve head assembly of claim 1 , wherein the second leg segment is curvilinear.
7. The valve head assembly of claim 1 , wherein main leg shaft is threaded at the first end.
8. The valve head assembly of claim 7 , wherein the valve body is disk shaped and comprises a upper surface and a lower surface that terminate at an outer peripheral edge formed therebetween, with a threaded bore formed in the lower surface, wherein the threaded end of the main leg shaft engages the threaded bore of the valve body.
9. The valve head assembly of claim 1 , wherein a bore is formed in the main leg shaft at the second end.
10. The valve head assembly of claim 1 , wherein the at least three legs comprises four legs extending from the main leg shaft.
11. The valve head assembly of claim 10 , wherein the four legs extending from the main leg shaft are symmetrically spaced from one another about the main leg shaft.
12. The valve head assembly of claim 1 , wherein the valve body is disk shaped and comprises a upper surface and a lower surface that terminate at an outer peripheral edge formed therebetween; and a seal attached adjacent the outer peripheral edge, wherein the upper surface of the valve body extends in an upper surface plane, the valve body further comprising an extension ring formed adjacent the upper surface at the outer peripheral edge; and an annular flange extending from the extension ring, wherein the annular flange extends in a flange plane, the flange plane being spaced apart from and above the upper surface plane.
13. The valve head assembly of claim 12 , wherein the annular flange has an upper surface, a lower surface and an outer peripheral surface, wherein the seal is disposed along the lower surface of the annular flange and adjacent at least a portion of the outer peripheral edge of the valve body.
14. A valve head assembly comprising: a disk shaped valve body having an upper surface and a lower surface with an outer peripheral edge formed between the upper and lower surfaces; a seal attached adjacent the outer peripheral edge; and a valve leg assembly, the valve leg assembly comprising a main leg shaft having a first end and a second end and extending along a main axis, and at least three legs extending from the main leg shaft, wherein the first end of the main leg shaft is attached to the valve body, wherein each leg has a first leg segment and a second leg segment, the first leg segment having a first end and a second end and extending along a first leg segment axis, wherein the first end of the first leg segment attaches to the main leg shaft adjacent the second end of the main leg shaft and the first leg segment extends back towards the first end of the main leg shaft so as to form an angle θ 1 between the main axis and the first leg segment axis, wherein the angle θ 1 is between 0 and 90 degrees; the second leg segment having a first end and a second end and extending along a second leg segment axis, wherein the second end of the first leg segment attaches to the second leg segment so as to form an angle θ 2 between the first leg segment axis and the second leg segment axis, wherein the angle θ 2 is between 0 and 90 degrees.
15. The valve head assembly of claim 14 , wherein the angle θ 1 is between 10 and 60 degrees.
16. The valve head assembly of claim 14 , wherein the second end of the first leg segment attaches to the second leg segment spaced apart from the first and second ends of the second leg segment.
17. The valve head assembly of claim 14 , wherein the main leg shaft further comprises a cavity formed at the second end of the main leg shaft.
18. The valve head assembly of claim 14 , wherein the valve body further comprises a threaded bore formed in the lower surface; and wherein the main leg shaft is threaded at the first end, wherein the threaded end of the main leg shaft engages the threaded bore of the valve body.
19. A valve head assembly comprising: a valve body, wherein the valve body is disk shaped about a main axis and comprises an upper surface and a lower surface, with an outer peripheral edge formed between the upper and lower surfaces, wherein the upper surface of the valve body extends in an upper surface plane, wherein the valve body further comprises an extension ring formed adjacent the upper surface at the outer peripheral edge; and an annular flange extending from the extension ring, wherein the annular flange extends in a flange plane, the flange plane being spaced apart from and above the upper surface plane; a seal attached adjacent the outer peripheral edge; and a valve leg assembly attached to the valve body, the valve leg assembly comprising a main leg shaft having a first end and a second end and extending along the main axis, and at least three legs extending from the main leg shaft, wherein the first end of the main leg shaft is attached to the valve body, wherein each leg has a first leg segment and a second leg segment, the first leg segment having a first end and a second end and extending along a first leg segment axis, wherein the first end of the first leg segment attaches to the main leg shaft and the first leg segment extends back towards the first end of the main leg shaft, the second leg segment having a first end and a second end and extending along a second leg segment axis, wherein the second end of the first leg segment attaches to the second leg segment and the second leg segment axis is parallel with but spaced apart from the main axis.
20. The valve head assembly of claim 19 , wherein the extension ring is inclined between the upper surface plane and the flange plane at an angle β, wherein the angle β is between 30 and 60 degrees.