Swing valve with replaceable seat and tools and methods for engaging seat

A swing valve, said swing valve comprising:

• (a) a passage having a receptacle;
• and
• (b) a sleeve pressure fitted into said receptacle, said sleeve adapted to conduct flow through said valve and comprising:
• i) a first end pressure fitted into said receptacle;
• ii) a second end projecting out of said receptacle;
• and
• iii) a valve seat on a face of said second sleeve end;
• iv) wherein said second sleeve end comprises external threads adapted to engage internal threads on a sleeve cap extending over and across said second sleeve end to shut off flow through said sleeve.

An assembly for removing a valve seat sleeve from a swing valve:

• (a) wherein said swing valve is assembled into a flow line adapted to convey frac fluid discharged from one or more high-pressure pumps to a well head;
• (b) wherein a first end of said valve seat sleeve is pressure fitted in a passage of said swing valve;
• and
• (c) wherein said assembly comprises a cap coupled over a second end of said valve seat sleeve;
• (d) whereby said valve seat sleeve may be dislodged from said passage by generating hydraulic pressure in said valve seat sleeve behind said cap.

A method of removing a valve seat sleeve from a swing valve mounted in a flow line adapted to convey frac fluid discharged from one or more high-pressure pumps to a well head, wherein one end of said valve seat sleeve is pressure fitted in said swing valve, said method comprising:

• (a) extracting a swing closure assembly of said swing valve;
• (b) coupling a cap over a second end of said valve seat sleeve;
• (c) pumping fluid from at least one of said one or more high-pressure pumps through said flow line toward said swing valve;
• and
• (d) building hydraulic pressure within said flow line to a level sufficient to dislodge said valve seat sleeve from said swing valve.

A system for fracturing a well, said system comprising:

• (a) a flow line adapted to convey frac fluid discharged from one or more high-pressure pumps to a well head;
• and
• (b) a swing valve mounted in said flow line and adapted to control flow through said flow line, said swing valve comprising:
• i) a valve housing adapted for assembly into said flow line;
• ii) a passage in said housing providing a valve inlet, a valve outlet, and a closure chamber;
• iii) a swing closure, said closure being mounted for pivoting movement through said, closure chamber;
• iv) a sleeve pressure fitted into a receptacle in said passage, said sleeve comprising:
• (1) a first end pressure fitted into said receptacle;
• (2) a second end projecting out of said receptacle into said closure chamber;
• and
• (3) a valve seat on a face of said second sleeve end;
• (4) wherein said second sleeve end comprises external lugs adapted to engage internal lugs on a sleeve cap extending over and across said second sleeve end to shut off flow through said sleeve.

A swing valve, said swing valve comprising:

• (a) a passage having a receptacle;
• and
• (b) a sleeve pressure fitted into said receptacle, said sleeve adapted to conduct flow through said valve and comprising:
• i) a first end pressure fitted into said receptacle;
• ii) a second end projecting out of said receptacle;
• and
• iii) a valve seat on a face of said second sleeve end;
• iv) wherein said second sleeve end comprises external lugs adapted to engage internal lugs on a sleeve cap extending over and across said second sleeve end to shut off flow through said sleeve.