Nut anti-rotation fluid end assemblies

Abstract

The present disclosure relates to reciprocating pumps, such as to fluid end assemblies of reciprocated pumps. In a first aspect, a fluid end assembly includes a body defining a bore and including at least one first thread. The assembly further includes a cover capable of being disposed within the bore, a nut including at least one second thread, and a retainer capable of being disposed relative to the nut such that the retainer restricts the nut from rotating relative to the body. The at least one second thread can engage with the at least one first thread such that, when the at least one second thread is engaged with the at least one first thread, the nut applies compressive force to the cover. Other aspects and features are also claimed and described.

What is claimed is: 
     
         1 . A fluid end assembly comprising:
 a body defining a bore and including at least one first thread;   a cover configured to be disposed within the bore;   a nut including at least one second thread that is configured to engage with the at least one first thread such that, when the at least one second thread is engaged with the at least one first thread, the nut applies compressive force to the cover; and   a retainer configured to be disposed relative to the nut such that the retainer restricts the nut from rotating relative to the body.   
     
     
         2 . The fluid end assembly of  claim 1 , wherein the at least one first thread and the at least one second thread each include buttress threading. 
     
     
         3 . The fluid end assembly of  claim 1 , wherein the nut is disposed between the cover and the retainer. 
     
     
         4 . The fluid end assembly of  claim 1 , wherein the body defines a groove configured to receive the retainer. 
     
     
         5 . The fluid end assembly of  claim 1 , wherein the retainer includes a retaining ring. 
     
     
         6 . The fluid end assembly of  claim 1 , wherein the retainer includes a plurality of tabs coupled to the nut. 
     
     
         7 . The fluid end assembly of  claim 1 , wherein the retainer includes a plurality of spring-loaded detents. 
     
     
         8 . The fluid end assembly of  claim 7 , wherein the body defines a plurality of indents configured to receive the plurality of spring-loaded detents. 
     
     
         9 . The fluid end assembly of  claim 1 , further comprising a hydraulic piston disposed between the cover and the nut. 
     
     
         10 . The fluid end assembly of  claim 1 , further comprising a load cell disposed between the cover and the nut and configured to determine a compressive load between the cover and the nut. 
     
     
         11 . The fluid end assembly of  claim 1 , wherein:
 the cover includes a conical portion,   the nut includes a split end that is split into a plurality of tabs, and   the split end is configured to be disposed around the conical portion such that the conical portion forces the plurality of tabs away from a central axis extending through the nut.   
     
     
         12 . A fluid end assembly comprising:
 a body defining a bore and including at least one first thread;   a cover configured to be disposed within the bore, wherein the cover includes a conical portion; and   a nut including at least one second thread and a split end that is split into a plurality of tabs, wherein the at least one second thread is configured to engage with the at least one first thread such that, when the at least one second thread is engaged with the at least one first thread, the nut applies compressive force to the cover,   wherein the split end is configured to be disposed around the conical portion such that the conical portion forces the plurality of tabs away from a central axis extending through the nut.   
     
     
         13 . The fluid end assembly of  claim 12 , further comprising a retainer disposed relative to the nut such that the retainer restricts the nut from rotating relative to the body. 
     
     
         14 . The fluid end assembly of  claim 13 , wherein the body defines a groove configured to receive the retainer. 
     
     
         15 . The fluid end assembly of  claim 13 , wherein the nut is disposed between the cover and the retainer. 
     
     
         16 . The fluid end assembly of  claim 13 , wherein the retainer includes a retaining ring. 
     
     
         17 . The fluid end assembly of  claim 13 , wherein the retainer includes a plurality of tabs coupled to the nut. 
     
     
         18 . The fluid end assembly of  claim 13 , wherein the retainer includes a plurality of spring-loaded detents. 
     
     
         19 . A pump comprising:
 a power end; and   a fluid end, wherein the fluid end includes:
 a body defining a bore and including at least one first thread; 
 a cover configured to be disposed within the bore; 
 a nut including at least one second thread that is configured to engage with the at least one first thread such that, when the at least one second thread is engaged with the at least one first thread, the nut applies compressive force to the cover; and 
 a retainer configured to be disposed relative to the nut such that the retainer restricts the nut from rotating relative to the body. 
   
     
     
         20 . The pump of  claim 19 , wherein the at least one first thread and the at least one second thread each include buttress threading.