WO2020180716A1 - Ensemble siège de soupape pour pompes de service de puits - Google Patents

Ensemble siège de soupape pour pompes de service de puits Download PDF

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Publication number
WO2020180716A1
WO2020180716A1 PCT/US2020/020464 US2020020464W WO2020180716A1 WO 2020180716 A1 WO2020180716 A1 WO 2020180716A1 US 2020020464 W US2020020464 W US 2020020464W WO 2020180716 A1 WO2020180716 A1 WO 2020180716A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve seat
insert
seat assembly
receptacle
diameter
Prior art date
Application number
PCT/US2020/020464
Other languages
English (en)
Inventor
Mark Alan Staggs
Jeremy Willard MILLER
Original Assignee
National Oilwell Varco, L.P.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National Oilwell Varco, L.P. filed Critical National Oilwell Varco, L.P.
Publication of WO2020180716A1 publication Critical patent/WO2020180716A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K25/00—Details relating to contact between valve members and seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed

Definitions

  • Well service pumps are used in the oil and gas industry to pump fluids down a well for various purposes.
  • One common use of well service pumps is in hydraulic fracturing of formations.
  • the pump can be used to pump a high pressure fluid containing solids into the well, where the high pressure fluid will expand fractures in the formation or fracture the formation, leaving larger fluid passages through which formation fluids can flow into the well.
  • the solids in the fluid will remain in the larger fluid passages to prop the fluid passages open, thereby increasing well production.
  • Well service pumps are commonly plunger pumps, which are a type of reciprocating positive displacement pumps.
  • a plunger reciprocates axially in a fluid end, with a packing retained between the fluid end and plunger preventing leakage during the reciprocating motion of the plunger.
  • a small annular gap is typically provided between the outer diameter of the plunger and the inner diameter of the packing to prevent galling or surface damage to the plunger as the plunger reciprocates.
  • slight increases in gap clearance may have a detrimental effect on the life of the packing due primarily to accelerated packing material extrusion.
  • High plunger compressive strength is typically needed to help maximize packing life and the operational efficiencies of the pump.
  • Many conventional high pressure well service plunger pumps use plungers of solid construction to achieve high plunger compressive strength.
  • larger diameter and/or longer stroke plungers with solid construction are often unwieldy to handle during routine maintenance operations.
  • Hollow plungers have been proposed, but these hollow plungers tend to deflect diametrically under loads.
  • crank mechanism to provide the reciprocating motion of the plunger.
  • the crank mechanism typically includes an extension rod that is rigidly attached to a crosshead that is constrained to move axially by the frame of the pump.
  • the crosshead is coupled to an eccentric crankshaft via a wrist pin and connecting rod. As the crankshaft rotates, the connecting rod transfers this motion to the crosshead. Because the crosshead is constrained to move axially, the rotational motion will be converted into reciprocating motion, which is transferred to the plunger via the extension rod.
  • the wrist pin is retained to the crosshead and is supported using a bearing located internally within the connecting rod.
  • An annular gap is typically provided between the outer diameter of the wrist pin and the inner diameter of the wrist pin bearing to allow distribution of a lubrication film and to prevent load transfer from the relatively large rod to the much smaller wrist pin. This annular gap allows deformation of the connecting rod bearing surface during high load conditions, which can create uneven loading and premature bearing failure, such as galling.
  • An embodiment of a valve seat assembly for a pump comprises a valve seat housing comprising a central passage defined by an inner surface and including an insert receptacle; and a valve seat insert that is insertable into the valve seat receptacle and comprising a contact surface configured to engage a valve of the pump; wherein at least one of the inner surface of the insert receptacle and an outer surface of the valve seat insert is coated with a non-metallic film.
  • the non-metallic film comprises a material configured to withstand temperatures of at least 600 Fahrenheit without cracking.
  • the non-metallic film comprises a polymer.
  • the inner surface of the insert receptacle comprises a first inclined surface inclined at a first angle from a longitudinal axis of the valve seat housing and a second inclined surface inclined at a second angle from the longitudinal axis that is different from the first angle.
  • a first diameter of the inner surface at a first end of the first inclined surface is greater than a second diameter of the inner surface at a second end of the first inclined surface.
  • a third diameter of the inner surface at an end of the second inclined surface that is spaced from the first inclined surface is greater than the second diameter of the inner surface.
  • an outer surface of the valve seat insert includes an inclined engagement surface configured to engage the first inclined surface of the insert receptacle; and an outer diameter of the valve seat insert at a first end of the inclined engagement surface is greater than an outer diameter of the valve seat insert at a second end of the inclined engagement surface.
  • the valve seat insert comprises an annular shoulder and a cylindrical portion extending axially from the annular shoulder.
  • the annular shoulder defines a maximum outer diameter of the valve seat assembly; and the valve seat insert has an axial length that is greater than half of a total axial length of the valve seat assembly.
  • An embodiment of a valve seat assembly for a pump comprises a valve seat housing comprising a central passage defined by an inner surface and including an insert receptacle; and an annular valve seat insert that is insertable into the valve seat receptacle and comprising a contact surface configured to engage a valve of the pump; wherein the inner surface of the insert receptacle comprises a first inclined surface inclined at a first angle from a longitudinal axis of the valve seat housing and a second inclined surface inclined at a second angle from the longitudinal axis that is different from the first angle.
  • a first diameter of the inner surface at a first end of the first inclined surface is greater than a second diameter of the inner surface at a second end of the first inclined surface.
  • the second inclined surface extends from the second end of the first inclined surface and the contact surface. In certain embodiments, the second angle is greater than the first angle. In certain embodiments, a third diameter of the inner surface at an end of the second inclined surface that is spaced from the first inclined surface is greater than the second diameter of the inner surface. In some embodiments, at least one of the inner surface of the insert receptacle and an outer surface of the valve seat insert is coated with a non-metallic film.
  • an outer surface of the valve seat insert includes an inclined engagement surface configured to engage the first inclined surface of the insert receptacle; and wherein an outer diameter of the valve seat insert at a first end of the inclined engagement surface is greater than an outer diameter of the valve seat insert at a second end of the inclined engagement surface.
  • the valve seat housing comprises an inclined shoulder and the valve seat insert comprises an inclined shoulder configured to matingly engage the inclined shoulder of the valve seat housing.
  • the valve seat insert has an axial length that is greater than half of a total axial length of the valve seat assembly.
  • An embodiment of a valve seat assembly for a pump comprises a valve seat housing comprising a central passage defined by an inner surface and including an insert receptacle; and an annular valve seat insert that is insertable into the valve seat receptacle and comprising a contact surface configured to engage a valve of the pump; wherein the inner surface of the insert receptacle comprises a first inclined surface, and wherein an outer surface of the valve seat insert includes an inclined engagement surface configured to engage the first inclined surface of the insert receptacle; wherein an outer diameter of the valve seat insert at a first end of the inclined engagement surface is greater than an outer diameter of the valve seat insert at a second end of the inclined engagement surface.
  • an interference fit is formed between the inclined engagement surface of the valve seat insert and the first inclined surface of the insert receptacle, and wherein a first interference of the interference fit located at the first end of the inclined engagement surface is the same as a second interference of the interference fit at a second end of the inclined engagement surface.
  • the first inclined surface is inclined at a first angle from a longitudinal axis of the valve seat; and the inner surface of the insert receptacle comprises a second inclined surface inclined at a second angle from the longitudinal axis that is different from the first angle.
  • an interference fit is formed between the inclined engagement surface of the valve seat insert and the first inclined surface of the insert receptacle, and wherein an interference of the interference fit decreases between the first end of the inclined engagement surface and the second end of the inclined engagement surface.
  • a first diameter of the inner surface at a first end of the first inclined surface is greater than a second diameter of the inner surface at a second end of the first inclined surface.
  • a third diameter of the inner surface at an end of the second inclined surface that is spaced from the first inclined surface is greater than the second diameter of the inner surface.
  • at least one of the inner surface of the insert receptacle and an outer surface of the valve seat insert is coated with a non-metallic film.
  • valve seat insert has an axial length that is greater than half of a total axial length of the valve seat assembly.
  • Figure 1 is a side cross-sectional view of an embodiment of a well service pump in accordance with principles disclosed herein;
  • Figure 2 is a side cross-sectional view of an embodiment of a valve seat assembly of the well service pump of Figure 1 in accordance with principles disclosed herein;
  • Figure 3 is a side cross-sectional view of an embodiment of a valve seat housing of the valve seat assembly of Figure 2 in accordance with principles disclosed herein;
  • Figure 4 is a zoomed-in, side cross-sectional view of the valve seat housing of Figure 3;
  • Figure 5 is a top view of an embodiment of a valve seat insert of the valve seat assembly of Figure 3 in accordance with principles disclosed herein;
  • Figure 6 is a cross-sectional view along line 6-6 of Figure 5 of the valve seat insert of Figure 5;
  • Figure 7 is a zoomed-in cross-sectional view along line 6-6 of Figure 5 of the valve seat insert of Figure 5;
  • Figure 8 is a side cross-sectional view of another embodiment of a valve seat assembly of the well service pump of Figure 1 in accordance with principles disclosed herein;
  • Figure 9 is a side cross-sectional view of an embodiment of a valve seat housing of the valve seat assembly of Figure 8 in accordance with principles disclosed herein;
  • Figure 10 is a side view of an embodiment of a valve seat insert of the valve seat assembly of Figure 8 in accordance with principles disclosed herein;
  • Figure 1 1 is a cross-sectional view along line 1 1-11 of Figure 10 of the valve seat insert of Figure 10.
  • the terms “including” and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean“including, but not limited to...
  • the term“couple” or“couples” is intended to mean either an indirect or direct connection. Thus, if a first device couples to a second device, that connection may be through a direct engagement between the two devices, or through an indirect connection that is established via other intermediate devices, components, nodes, and connections.
  • axial and“axially” generally mean along or parallel to a particular axis (e.g., central axis of a body or a port), while the terms“radial” and “radially” generally mean perpendicular to a particular axis.
  • an axial distance refers to a distance measured along or parallel to the axis
  • a radial distance means a distance measured perpendicular to the axis.
  • any reference to up or down in the description and the claims is made for purposes of clarity, with“up”,“upper”,“upwardly”,“uphole”, or“upstream” meaning toward the surface of the borehole and with“down”,“lower”, “downwardly”,“downhole”, or“downstream” meaning toward the terminal end of the borehole, regardless of the borehole orientation.
  • the terms “approximately,”“about,”“substantially,” and the like mean within 10% (i.e., plus or minus 10%) of the recited value.
  • a recited angle of “about 80 degrees” refers to an angle ranging from 72 degrees to 88 degrees.
  • pump 10 is shown.
  • pump 10 is well service pump having internal plungers 28, and thus is referred to as a plunger pump 10; however, in other embodiments, pump 10 may comprise other types of pumps known in the art.
  • well service pump 10 includes a fluid end 12 coupled to a power end 14 via a plurality of stray rods or fasteners 13.
  • the fluid end 12 of well service pump 10 includes a fluid end housing 15 which comprises a fluid chamber 16, a suction bore 18A, a discharge bore 18B, a plunger bore 20A, and an access bore 20B, each of which intersect fluid chamber 16.
  • suction bore 18A and discharge bore 18B of fluid end housing 15 are opposed and axially aligned along a common longitudinal axis.
  • Suction bore 18A of fluid end housing 15 is in selective fluid communication with a suction manifold 21 via a suction valve 23A of fluid end 12.
  • the discharge bore 18B of fluid end housing 15 is in selective fluid communication with a discharge port 25 via a discharge valve 23B of fluid end 12.
  • Fluid end 12 of well service pump 10 additionally includes a suction valve seat assembly 100A positioned in suction bore 18A of fluid end housing 15 and a discharge valve seat assembly 100B positioned in the discharge bore 18B of fluid end housing 15.
  • discharge valve seat assembly 100B may be coupled to fluid end housing 15 via frictional contact, an interference fit, a connector positioned on discharge valve seat assembly 100B, and/or via a separate retainer used to fasten discharge valve seat assembly 100B with fluid end housing 15.
  • suction valve seat assembly 100A may be coupled to fluid end housing 15 via frictional contact, an interference fit, a connector positioned on suction valve seat assembly 100A, and/or via a separate retainer used to fasten suction valve seat assembly 100A with fluid end housing 15.
  • Suction valve 23A of fluid end 12 is biased into engagement or contact with suction valve seat assembly 100A via a suction biasing member 27A while discharge valve 23B is biased into engagement or contact with discharge seat assembly 100B via a discharge biasing member 27B.
  • suction valve 23A When suction valve 23A is in contact with suction valve seat assembly 100A, fluid communication is restricted between suction manifold 21 and the fluid chamber 16 of fluid end housing 15. Similarly, fluid communication is restricted between discharge port 25 and fluid chamber 16 when discharge valve 23B is contacts discharge valve assembly 100B.
  • well service pump 10 additionally includes a plunger 28 slidably positioned in plunger bore 20A.
  • Plunger 28 may reciprocate into and out of the fluid chamber 16 in response to the actuation of a crank mechanism 34 of the power end 14 of well service pump 10.
  • plunger 28 is withdrawn from the fluid chamber 16 into the plunger bore 20A, thereby drawing fluid from the suction manifold 21 , through suction valve 23A, and into fluid chamber 16 of fluid end housing 15.
  • the suction valve 23A is lifted off the suction valve seat assembly 100A when the force of the fluid from the fluid chamber 16 overcomes the force of suction biasing member27A. Fluid flows into fluid chamber 16 from suction manifold 21 in response to the suction valve 23A being lifted from the suction valve seat assembly 100A.
  • plunger 28 displaces or extends from the plunger bore 20A into fluid chamber 16, whereby plunger 28 forces fluid in fluid chamber 16 through discharge valve 23B and into the discharge port 25 of fluid end housing 15.
  • the discharge valve 23B is lifted off the discharge valve seat assembly 100B when the force of the fluid from the fluid chamber 16 overcomes the force of discharge biasing member 27B. Fluid flows into discharge port 25 from fluid chamber 16 in response to the discharge valve 23B being lifted from the discharge valve seat assembly 100B.
  • valve seat assembly 100 of the well service pump 10 of Figure 1 is shown in Figures 2-7.
  • the valve seat assembly 100 shown in Figures 2-7 may comprise suction valve seat assembly 100A and/or discharge valve seat assembly 100B of the well service pump 10 of Figure 1.
  • valve seat assembly 100 has a central or longitudinal axis 105 and generally includes a cylindrical valve seat housing 102 and an annular valve seat insert 200 received in the valve seat housing 102.
  • the valve seat housing 102 of valve seat assembly 100 has a first or upper end 104, a second or lower end 106 opposite upper end 104, a central bore or passage 108 defined by a generally cylindrical inner surface 110 extending between ends 104, 106, and a generally cylindrical outer surface 112 extending between ends 104, 106.
  • an annular seal assembly 1 14 is positioned on the outer surface 1 12 of valve seat housing 1 12. Seal assembly 1 14 is configured to seal against an inner surface of the suction bore 18A (when valve seat housing 102 positioned in suction bore 18A) and/or discharge bore 18B (when valve seat housing 102 is positioned in discharge bore 18B) of fluid end housing 15 of the fluid end 12 shown in Figure 1.
  • outer surface 1 12 of valve seat housing 102 includes a radially extending, annular shoulder 116 positioned axially between seal assembly 1 14 and upper end 104.
  • Annular shoulder 1 16 is configured to matingly seat against a corresponding shoulder of the suction bore 18A (when valve seat housing 102 positioned in suction bore 18A) and/or discharge bore 18B (when valve seat housing 102 is positioned in discharge bore 18B) of fluid end housing 15 of the fluid end 12 shown in Figure 1.
  • the central passage 108 of valve seat housing 102 includes an insert receptacle 1 18 positioned between upper end 104 and lower end 106.
  • Insert receptacle 1 18 of valve seat housing 102 is configured to receive and house the valve seat insert 200 of valve seat assembly 100.
  • the inner surface 1 10 of insert receptacle 118 includes a radially extending annular shoulder 120, an annular first or lower inclined surface 126, and an annular second or upper inclined surface 130.
  • an annular curved edge 124 is positioned between a first or lower end 127 of lower inclined surface 126 and a radially inner end of annular shoulder 120.
  • curved edge 124 has a radius of about 1/8 of an inch; however, in other embodiments, the radius of curved edge 124 may vary.
  • the lower inclined surface 126 of insert receptacle 118 extends from lower end 127 to an annular transition point positioned between lower inclined surface 126 and upper inclined surface 130 of insert receptacle 1 18.
  • Upper inclined surface 130 extends from a first or lower end positioned at transition point 128 to a second or upper end 132 that defines an upper end of insert receptacle 118.
  • an axial length 131 between annular shoulder 120 and transition point 128 is between about 0.40 inches and 0.41 inches; however, in other embodiments, length 131 may vary.
  • an axial length 133 between annular shoulder 120 and the upper end 132 of upper inclined surface 130 is between about 0.51 inches and 0.52 inches; however, in other embodiments, length 133 may vary.
  • valve seat housing 102 includes an annular inclined shoulder 140 extending from the upper end 132 of upper inclined surface 130 towards the upper end 104 of valve seat housing 102.
  • annular curved edge 142 is positioned at upper end 104 of valve seat housing 102, where inclined shoulder 140 extends to curved edge 142.
  • lower inclined surface 126 of insert receptacle 118 is inclined at a non-zero first angle 125 relative to the central axis 105 such that a first inner diameter 137 of central passage 108 located at the lower end 127 of lower inclined surface 126 is less than a second inner diameter 139 of central passage 108 located at the transition point 128.
  • first angle 125 of lower inclined surface 126 is between about 0.7° and 1.3°; however, in other embodiments, first angle 125 of lower inclined surface 126 may vary.
  • first inner diameter 137 of central passage 108 is between about 4.24 inches and 4.25 inches
  • second inner diameter 139 of central passage 108 is between about 4.23 inches and 4.24 inches
  • the difference between first inner diameter 137 and second inner diameter 139 is between about 0.08 inches and 0.12 inches; however, in other embodiments, the size of diameters 137, 139, and the difference between them, may vary.
  • upper inclined surface 130 of insert receptacle 1 18 is inclined at a non-zero second angle 135 relative to the central axis 105 such that a third inner diameter 141 of central passage 108 located at the upper end 132 of upper inclined surface 130 is greater than the second inner diameter 139 of central passage 108 located at the transition point 128.
  • second angle 135 of upper inclined surface 130 is between about 2.7° and 3.3°; however, in other embodiments, second angle 135 of upper inclined surface 130 may vary.
  • the third inner diameter 141 of central passage 108 is between about 4.24 inches and 4.25 inches, and the difference between third inner diameter 141 and second inner diameter 139 is between about 0.08 inches and 0.12 inches; however, in other embodiments, the size of third inner diameter 141 , and the difference between third inner diameter 141 and second inner diameter 139 them may vary. In some embodiments, the first diameter 127 of central passage 108 and the third inner diameter 141 of central passage 108 may be substantially equal. [0040] As described above, due to first angle 125 of lower inclined surface 126, central passage 108 of valve seat housing 102 decreases in diameter moving in the direction of upper end 104 from the lower end 127 of lower inclined surface 126 to transition point 128.
  • first angle 125 may be described as a negative angle 125 and lower inclined surface 126 may be described as a negatively inclined surface 126, whereas second angle 135 may be described as a positive angle 135 and upper inclined surface 130 may be described as a positively inclined surface 130.
  • negatively inclined surface 126 is configured to lock valve seat insert 200 within insert receptacle 118 of valve seat housing 102, assisting to prevent the dislodging of valve seat insert 200 from insert receptacle 1 18 following forcible contact between one of valves 23A, 23B of the fluid end 12 shown in Figure 1 and valve seat insert 200.
  • valves 23A, 23B are configured to contact the valve seat insert 200, and not the valve seat housing 102, of valve seat assemblies 100A, 100B, respectively.
  • the valve seat housing 102 of valve seat assembly 100 comprises a first material having material properties that differ from material properties of a second material of which the valve seat insert 200 of valve seat assembly 100 is comprised.
  • the second material of valve seat insert 200 comprises a harder, more wear resistant material than the first material of valve seat housing 102.
  • the second material of valve seat insert 200 comprises tungsten carbide; however, in other embodiments, the second material of valve seat insert 200 may comprise other types of wear resistant materials.
  • the wear resistant material of valve seat insert 200 is configured to better withstand repeated contact from either suction valve 23A or discharge valve 23B of fluid end 12, and thereby increase the service life of valve seat assembly 100 while also minimizing the material cost of valve seat assembly 100 by forming only the portion of valve seat assembly 100 exposed to contact from valve 23A, 23B (valve seat insert 200) from the wear resistant second material.
  • the first material of valve seat housing 102 may comprise a material that is less expensive and easier to machine or manufacture than the wear resistant material from which valve seat insert 200 is comprised.
  • valve seat insert 200 of valve seat assembly 100 has a first or upper end 202, a second or lower end 204 opposite upper end 202, a central bore or passage 206 defined by a generally cylindrical inner surface 208 extending between ends 202, 204, and a generally cylindrical outer surface 210 extending between ends 202, 204.
  • valve seat insert 200 has an axial length 207 between upper end 202 and lower end 204 that is about 0.49 inches to 0.51 inches; however, in other embodiments, axial length 207 of valve seat insert 200 may vary.
  • valve seat insert 200 includes an annular inclined shoulder 212 extending axially from upper end 202.
  • Inclined shoulder 212 comprises an engagement surface configured to contact one of the valves 23A, 23B of fluid end 12 during the operation of well service pump 10.
  • Inclined shoulder 212 is inclined by a third angle 213 relative to the central axis 105 of valve seat assembly 100.
  • third angle 213 is between about 25° and 35°; however, in other embodiments, third angle 213 may vary.
  • an inner diameter 215 of inner surface 208 at the lower end of inclined shoulder 212 is between about 3.25 inches and 3.26 inches; however, in other embodiments, the inner diameter 215 of inner surface 208 at the lower end of inclined shoulder 212 may vary.
  • the outer surface 210 of valve seat insert 200 comprises an annular inclined shoulder 220 extending from lower end 204 to an annular transition point 224, and an annular inclined engagement surface 228 extending from transition point 224 to the upper end 202 of valve seat insert 200.
  • the upper end 202 of valve seat insert is defined by an annular upper shoulder 240 that extends radially between an upper end of inclined shoulder 212 and an upper end of inclined engagement surface 228.
  • inclined shoulder 212 may extend entirely to upper end 202 of valve seat insert 200 and thus intersect inclined engagement surface 228.
  • engagement surface 228 of valve seat insert 200 is inclined at a non-zero fourth angle 229 relative to the central axis 105 of valve seat assembly 100 such that a first outer diameter 231 of outer surface 210 located at transition point 224 is greater than a second outer diameter 233 of outer surface 210 located at upper end 202.
  • fourth angle 229 of engagement surface 228 is between about 0.7° and 1.3°; however, in other embodiments, fourth angle 229 of engagement surface 228 may vary.
  • first outer diameter 231 of outer surface 210 is between about 4.25 inches and 4.26 inches
  • second outer diameter 233 of outer surface 210 is between about 4.24 inches and 4.25 inches
  • the difference between first outer diameter 231 and second outer diameter 233 is between about 0.08 inches and 0.12 inches; however, in other embodiments, the size of diameters 231 , 233, and the difference between them, may vary.
  • fourth angle 229 of engagement surface 2208 Due to fourth angle 229 of engagement surface 228, the outer diameter of engagement surface 228 increases moving from lower end 204 towards upper end 202, with the first outer diameter 231 of engagement surface 228 at lower end 204 being less than the second outer diameter 233 of engagement surface 228 at upper end 202.
  • fourth angle 229 may be described as a positive angle 229 and engagement surface 228 may be described as a positively inclined engagement surface 228.
  • fourth angle 229 is substantially similar to the first angle 125 of the lower inclined surface 126 of valve seat housing 102 in size or degree of deviation from central axis 105; however, in other embodiments, fourth angle 229 may differ from first angle 125.
  • first angle 125 is a negative angle whereas fourth angle 229 is a positive angle.
  • annular, first or lower inclined interface 250 is formed between engagement surface 228 of valve seat insert 200 and the lower inclined surface 126 of valve seat housing 102 when valve seat insert 200 is positioned in the insert receptacle 118 of valve seat housing 102. Engagement surface 228 and lower inclined surface 126 extend parallel along lower inclined interface 250.
  • fourth angle 229 is less than the second angle 135 of the upper inclined surface 130 of valve seat housing 102 in size or degree of deviation from central axis 105.
  • An annular, second or upper inclined interface 252 is formed between engagement surface 228 of valve seat insert 200 and the upper inclined surface 130 of valve seat housing 102 when valve seat insert 200 is positioned in the insert receptacle 1 18 of valve seat housing 102.
  • engagement surface 228 does not extend in parallel with upper engagement surface 230 along upper inclined interface 250. Instead, engagement surface 228 extends at an angle relative to upper engagement surface 230 along upper inclined interface 250.
  • Non-metallic film 260 is configured to dampen and/or absorb vibrational shock imparted to valve seat insert 200 from the valves 23A, 23B of fluid end 12 during the operation of well service pump 10, and thereby prevent valve seat insert 200 from being ejected from insert receptacle 1 18 of valve seat housing 102 in response to impact between valve seat insert 200 and valves 23A, 23B.
  • non-metallic film 260 prevents or at least mitigates “bouncing” or “chattering” of the lower end 204 of valve seat insert 200 against the annular shoulder 120 of insert receptacle 1 18 during the operation of well service pump 10 which may otherwise inadvertently eject or dislodge valve seat insert 200 from insert receptacle 1 18.
  • the surfaces of insert receptacle 118 are coated with non-metallic film 260 prior to the insertion of valve seat insert 200 therein
  • the inclined engagement surface 228 of valve seat insert 200 is coated with non-metallic film 260 prior to insertion into the insert receptacle 118 of valve seat housing 102.
  • non-metallic film 260 may have adhesive properties to assist with adhering valve seat insert 200 to insert receptacle 1 18 and thereby prevent the dislodging of valve seat insert 200 from insert receptacle 118.
  • non-metallic film 260 comprises a temperature-resistant (e.g., capable of withstanding temperatures f about 500 Fahrenheit (F) to about 1 ,000 F without cracking, shrinkage, mass loss, and/or degradation of properties polymer based material, such as Seal-Lock® Fluid-Weld® provided by Silver Seal Products, Inc. of 19224 Allen Road, P.O. Box 1050 Trenton, Michigan; however, in other embodiments, non-metallic film 260 may comprise other temperature-resistant materials.
  • a temperature-resistant e.g., capable of withstanding temperatures f about 500 Fahrenheit (F) to about 1 ,000 F without cracking, shrinkage, mass loss, and/or degradation of properties polymer based material, such as Seal-Lock® Fluid-Weld® provided by Silver Seal Products, Inc. of 19224 Allen Road, P.O. Box 1050 Trenton, Michigan; however, in other embodiments, non-metallic film 260 may comprise other temperature-resistant materials.
  • a solid temperature-resistant, vibrational shock dampening material e.g., soft metals, polymer gaskets, etc.
  • a solid temperature-resistant, vibrational shock dampening material may be positioned on the surfaces of insert receptacle 118 to dampen and/or absorb vibrational energy imparted to valve seat insert 200 in response to contact between insert 200 and the valves 23A, 23B of fluid end 12.
  • the predetermined heating temperature is between about 800 F and 1 ,000 F; however, in other embodiments, the predetermined heating temperature may vary.
  • valve seat housing 102 may be permitted to cool from the predetermined heating temperature to an ambient temperature.
  • an interference fit is formed between inclined surfaces 126, 130 of insert receptacle 1 18 and the inclined engagement surface 228 of valve seat insert 200.
  • a first or lower interference fit 251 is formed along the lower inclined interface 250 formed between engagement surface 228 of valve seat insert 200 and the lower inclined surface 126 of valve seat housing 102.
  • Lower interference fit 251 is substantially constant moving axially along lower inclined interface 250 between transition point 224 of valve seat insert 200 to the transition point 128 of insert receptacle 118.
  • the lower interference fit 251 formed between valve seat insert 200 and insert receptacle 118 of valve seat housing 102 at the axial location of the transition point 224 of valve seat insert 200 is substantially the same as the lower interference fit 251 formed between valve seat insert 200 and insert receptacle 1 18 at the axial location of the transition point 128 of insert receptacle 118.
  • lower interference fit 251 is between about 0.005 inches and 0.010 inches; however, in other embodiments, the size of lower interference fit 251 may vary.
  • valve seat insert 200 extends parallel with the lower inclined surface 126 of insert receptacle 118 and the first outer diameter 231 of valve seat insert 200 at transition point 224 is greater than the second outer diameter 233 of valve seat insert 200 at upper end 202, the amount of interference (e.g., difference in diameter) between first outer diameter 231 of valve seat insert 200 and the third inner diameter 131 of the central passage 108 of valve seat housing 102 is greater than the size of lower interference fit 251.
  • the additional interference formed between the transition point 224 of valve seat insert 200 and the transition point 128 of insert receptacle 1 18 assists in preventing valve seat insert 200 from becoming dislodged or ejected from insert receptacle 1 18 in response to impact between valve seat insert 200 and valves 23A, 23B.
  • the interference formed between the transition point 224 of valve seat insert 200 and the transition point 128 of insert receptacle 118 is about twice as great as the interference provided by lower interference fit 251 ; however, in other embodiments, the additional interference formed between transition points 224, 128 may vary.
  • a second or upper interference fit 253 is formed along the upper inclined interface 252 formed between engagement surface 228 of valve seat insert 200 and the upper inclined surface 130 of valve seat housing 102.
  • Upper interference fit 253 varies moving axially along upper inclined interface 252 such that a maximum interference of upper interference fit 253 is formed between valve seat insert 200 and insert receptacle 1 18 at the axial location of transition point 128.
  • the interference of upper interference fit 253 gradually reduces from the maximum at transition point 128 moving axially upwards along upper inclined interface 252 to a minimum interference of upper interference fit 253 at the axial location of the upper end 202 of valve seat insert 200.
  • the minimum interference of upper interference fit 253 at the axial location of upper end 202 is substantially zero; however, in other embodiments, the minimum interference of upper interference fit 253 may be greater than zero but still less than the maximum interference of upper interference fit 253.
  • the radial width of valve seat insert 200 e.g., the radial width between inner surface 208 and outer surface 210) decreases moving axially upwards towards upper end 202 from transition point 224
  • the reduction in interference provided by upper interference fit 253 reduces the stress applied to the relatively thin upper end 202 of valve seat insert 200, serving to prevent or mitigate the possibility of cracking or other stress-related damage occurring to upper end 202 from excessive interference between valve seat insert 200 at upper end 202 and insert receptacle 1 18.
  • valve seat assembly 300 of the well service pump 10 of Figure 1 is shown in Figures 8-11.
  • the valve seat assembly 300 shown in Figures 8-11 may comprise suction valve seat assembly 100A and/or discharge valve seat assembly 100B of the well service pump 10 of Figure 1.
  • Valve seat assembly 300 includes features in common with the valve seat assembly 100 shown in Figures 2-7, and shared features are labeled similarly.
  • valve seat assembly 300 has a central or longitudinal axis 305 and generally includes a cylindrical valve seat housing 302 and an annular valve seat insert 400 received in the valve seat housing 302.
  • valve seat housing 302 of valve seat assembly 300 has a first or upper end
  • valve seat housing 302 includes a radially extending, annular shoulder 314 positioned axially between seal assembly 1 14 and upper end 304.
  • Annular shoulder 314 is configured to matingly seat against a corresponding shoulder of the suction bore 18A (when valve seat housing 302 positioned in suction bore 18A) and/or discharge bore 18B (when valve seat housing 302 is positioned in discharge bore 18B) of fluid end housing 15 of the fluid end 12 shown in Figure 1.
  • the central passage 308 of valve seat housing 302 includes an insert receptacle 316 positioned between upper end 304 and lower end 306.
  • Insert receptacle 316 of valve seat housing 302 is configured to receive and house the valve seat insert 400 of valve seat assembly 300.
  • the inner surface 310 of insert receptacle 316 includes a radially extending annular upper shoulder 318 and an annular inclined surface 320.
  • Inclined surface 320 extends along central axis 305 between a first or lower end 319 and a second or upper end 321 opposite lower end 319.
  • annular first or upper curved edge 324 of inner surface 310 is positioned between the upper end 321 of inclined surface 320 and a lower end 323 of annular shoulder 318.
  • upper curved edge 324 has a radius of approximately 0.31 inches; however, in other embodiments, the radius of upper curved edge 324 may vary.
  • Inner surface 310 of valve seat housing 302 additionally includes a lower annular shoulder 326 extending radially inwards towards central axis
  • Lower annular shoulder 326 is positioned axially between the lower end 319 of inclined surface 320 and the lower end 304 of valve seat housing 302.
  • An annular second or lower curved edge 328 extends between the lower end 319 of inclined surface 320 and lower shoulder 326.
  • lower curved edge 328 has a radius of approximately 1/8 of an inch; however, in other embodiments, the radius of lower curved edge 328 may vary.
  • an annular curved edge 330 is positioned at upper end 304 of valve seat housing 302, where upper shoulder 318 extends to curved edge 330.
  • inclined surface 320 of insert receptacle 316 is inclined at a non-zero first angle 325 relative to the central axis 305 such that a first inner diameter 332 of central passage 308 located at the lower end 319 of inclined surface 320 is greater than a second inner diameter 334 of central passage 308 located at the upper end 321 of inclined surface 320.
  • first angle 325 may be described as a negative first angle 325 and inclined surface 320 may be described as a negatively inclined surface 320.
  • negatively inclined surface 320 assists in preventing the dislodging of valve seat insert 400 from insert receptacle 316 following forcible contact between one of valves 23A, 23B of the fluid end 12 shown in Figure 1 and valve seat insert 400.
  • first angle 325 of inclined surface 320 is between about 0.7° and 1.3°; however, in other embodiments, first angle 325 of inclined surface 320 may vary. Additionally, in this embodiment, the first inner diameter 332 of central passage 308 is between about 3.75 inches and 3.76 inches, the second inner diameter 334 of central passage 308 is between about 3.74 inches and 3.75 inches, and the difference between first inner diameter 332 and second inner diameter 334 is between about 0.06 inches and 0.10 inches; however, in other embodiments, the size of diameters 332, 334, and the difference between them, may vary.
  • the central passage 308 of valve seat housing 302 includes a reduced diameter portion 309 extending between lower shoulder 326 and the lower end 306 of valve seat housing 302.
  • valve seat housing 308 has an axial length of approximately 12-15% of the total axial length (axial length extending between ends 304, 306) of valve seat housing 302; however, in other embodiments, the relationship between the axial length of reduced diameter portion
  • insert receptacle 316 has an axial length of approximately 75-90% of the total axial length of valve seat housing 302; however, in other embodiments, the relationship between the axial length of insert receptacle 316 and the total axial length of valve seat housing 302 may vary.
  • inclined surface 320 of insert receptacle 316 has an axial length that is 50% or greater than the total axial length of valve seat housing 302; however, in other embodiments, the relationship between the axial length of inclined surface 320 and the total axial length of valve seat housing 302 may vary.
  • valve seat insert 400 of valve seat assembly 300 has a first or upper end 402, a second or lower end 404 opposite upper end 402, a central bore or passage 406 defined by a generally cylindrical inner surface 408 extending between ends 402, 404, and a generally cylindrical outer surface 410 extending between ends 402, 404.
  • the valve seat housing 302 of valve seat assembly 300 comprises a first material having material properties that differ from material properties of a second material of which the valve seat insert 400 of valve seat assembly 300 is comprised.
  • the second material of valve seat insert 400 comprises a harder, more wear resistant material than the first material of valve seat housing 302.
  • the second material of valve seat insert 400 comprises tungsten carbide; however, in other embodiments, the second material of valve seat insert 400 may comprise other types of wear resistant materials.
  • the wear resistant material of valve seat insert 400 of valve seat assembly 300 is configured to better withstand repeated contact from either suction valve 23A or discharge valve 23B of fluid end 12, and thereby increase the service life of valve seat assembly 400 while also minimizing the material cost of valve seat assembly 300.
  • the inner surface 408 of valve seat insert 400 includes an annular inclined shoulder 412 extending axially towards an annular first or upper curved edge 414 positioned at the upper end 402 of valve seat insert 400.
  • Inclined shoulder 412 comprises an engagement surface configured to contact one of the valves 23A, 23B of fluid end 12 during the operation of well service pump 10.
  • the inner surface 408 of valve seat insert 400 additionally includes a substantially constant diameter or cylindrical portion 416 extending axially from lower end 404 and an annular second or lower curved edge 418 extending axially between an upper end of cylindrical portion 416 and a lower end of inclined shoulder 412.
  • an inner diameter 419 of the cylindrical portion 416 of inner surface 408 is less than an inner diameter of the reduced diameter portion 309 of valve seat housing 302.
  • inner diameter 419 defines a minimum internal or inner diameter 419 of valve seat assembly 300; however, in other embodiments, the relationship between the inner diameter 419 of valve seat insert 400 and the inner diameter of the reduced diameter portion 309 of valve seat housing 302 may vary.
  • the outer surface 410 of valve seat insert 400 comprises an annular inclined engagement surface 420 extending from an annular first or lower curved edge 422 positioned at the lower end 404 of valve seat insert 400, and an annular inclined shoulder 424 extending axially to a substantially constant diameter or cylindrical portion 426 which extends to upper curved edge 414. Additionally, outer surface 410 includes an annular intermediate curved edge 428 extending axially between inclined engagement surface 420 and inclined shoulder 424.
  • inclined engagement surface 420 has an axial length that is greater than 50% of the total axial length extending from upper end 402 to lower end 404 of valve seat inset 400; however, in other embodiments, the relationship between the axial length of inclined engagement surface 420 and the total axial length of valve seat insert 400 may vary.
  • the cylindrical portion 426 of outer surface 410 has an outer diameter that defines a maximum outer diameter of valve seat insert 400. In this embodiment, the outer diameter of the cylindrical portion 426 of outer surface 410 is substantially equal to a maximum outer diameter of valve seat housing 302; however, in other embodiments, the relationship between the outer diameter of the cylindrical portion 426 of valve seat insert 400 and the maximum outer diameter of valve seat housing 302 may vary.
  • the inclined engagement surface 420 of outer surface 410 is inclined at a non zero second angle 425 relative to the central axis 305 such that a first outer diameter 430 of outer surface 410 located at a first or lower end 421 of inclined engagement surface 420 is greater than a second outer diameter 432 of outer surface 410 located at a second or upper end 432 of inclined engagement surface 420.
  • the diameter of outer surface 410 gradually decreases moving axially from the lower end 421 of inclined engagement surface 420 towards the upper end 423 thereof.
  • second dangle 425 may be described as a negative second angle 425 and inclined engagement surface 420 may be described as a negatively inclined engagement surface 420.
  • second angle 425 of inclined engagement surface 420 is between about 0.7° and 1.3°; however, in other embodiments, second angle 425 of inclined engagement surface 420 may vary.
  • the first inner diameter 430 of outer surface 410 is between about 3.76 inches and 3.77 inches
  • the second inner diameter 432 of outer surface 410 is between about 3.75 inches and 3.76 inches
  • the difference between first inner diameter 430 and second inner diameter 432 is between about 0.06 inches and 0.10 inches; however, in other embodiments, the size of diameters 430, 432, and the difference between them, may vary.
  • the inclined shoulder 423 of valve seat insert 400 is configured to matingly engage the upper shoulder 318 when valve seat insert 400 is received in the insert receptacle 316 of valve seat housing 302. Additionally, the inclined engagement surface 420 of valve seat insert 400 is configured to matingly engage the inclined surface 320 of valve seat housing 302 when valve seat insert 400 is received in the insert receptacle 316 of valve seat housing 302.
  • second angle 425 of the inclined engagement surface 420 is substantially similar to the first angle 325 of the inclined surface 320 of valve seat housing 302 in size or degree of deviation from central axis 305; however, in other embodiments, second angle 425 may differ from first angle 325.
  • an annular inclined interface 427 (shown in Figure 8) is formed between inclined engagement surface 420 of valve seat insert 400 and the inclined surface 320 of valve seat housing 302 when valve seat insert 400 is positioned in the insert receptacle 316 of valve seat housing 302.
  • Inclined engagement surface 420 and inclined surface 320 extend parallel along inclined interface 427.
  • non-metallic film 260 is positioned along at least a portion of inclined interface 427 to dampen and/or absorb vibrational shock imparted to valve seat insert 400 from the valves 23A, 23B of fluid end 12 during the operation of well service pump 10; however, in other embodiments, valve seat assembly 300 may not include non- metallic film 260.
  • valve seat assembly 300 is assembled by heating valve seat housing 302 to a predetermined heating temperature to expand the inner diameter of insert receptacle 316, permitting the insertion of valve seat insert 400 therein.
  • valve seat insert 400 is axially inserted through central passage 308 of valve seat housing 302 and into the insert receptacle 316 such that inclined shoulder 423 of valve seat insert 400 matingly engages the upper shoulder 318 of valve seat housing 302 with valve seat insert 400 received in insert receptacle 316.
  • valve seat housing 302 is permitted to cool from the predetermined heating temperature to an ambient temperature.
  • an interference fit 429 is formed between inclined surface 320 of valve seat housing 302 and the inclined engagement surface 420 of valve seat insert 400.
  • Interference fit 429 is substantially constant moving axially along inclined interface 427. In this embodiment, interference fit 429 is between about 0.005 inches and 0.010 inches; however, in other embodiments, the size of interference fit 429 may vary.
  • valve seat insert 400 extends parallel with the inclined surface 320 of insert receptacle 316 and the first outer diameter 430 of inclined engagement surface 420 is greater than the second outer diameter 432 thereof, the difference in diameter or interference formed between the first outer diameter 430 and the second inner diameter 334 of central passage 308 is greater than the difference in diameter or interference formed between first outer diameter 430 and the first inner diameter 332 of central passage 308.
  • inclined interface 427 wedges valve seat insert 400 into the insert receptacle 316 of valve seat housing 302, assisting in preventing valve seat insert 400 from becoming dislodged from insert receptacle 316.
  • valve seat insert 400 when valve seat insert 400 is received in the insert receptacle 316 of valve seat housing 302, valve seat insert 400 covers a majority of an axial length of inner surface 310 of valve seat housing 302 such that only a minority of the axial length of inner surface 310 is exposed to tools or objects passing through the central passage 308 of valve seat housing 302.
  • valve seat insert 400 is formed of a harder material than valve seat housing 302
  • the inner surface 310 of valve seat housing 302 is protected from damage (e.g., resulting from contact between inner surface 310 and tools passing through central passage 308) by the extension of valve seat insert 400 through a majority of the axial length of inner surface 310.
  • valve seat insert 400 defines a maximum outer diameter of valve seat assembly 300
  • the inclined shoulder 424 of valve seat insert 400 covers an entirety of the upper shoulder 318 of valve seat housing 302, thereby protecting upper shoulder 318 from damage (e.g., resulting from contact between upper shoulder 318 and tools passing through central passage 308).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

Un ensemble siège de soupape pour une pompe comprend un boîtier de siège de soupape comprenant un passage central défini par une surface intérieure et comprenant un réceptacle d'insert, et un insert de siège de soupape insérable dans le réceptacle de siège de soupape et comprenant une surface de contact conçue pour venir en prise avec une soupape de la pompe, au moins l'une parmi la surface interne du réceptacle d'insert et une surface externe de l'insert de siège de soupape étant revêtue d'un film non métallique.
PCT/US2020/020464 2019-03-01 2020-02-28 Ensemble siège de soupape pour pompes de service de puits WO2020180716A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201962812518P 2019-03-01 2019-03-01
US62/812,518 2019-03-01
US201962874324P 2019-07-15 2019-07-15
US62/874,324 2019-07-15

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WO2020180716A1 true WO2020180716A1 (fr) 2020-09-10

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518329A (en) * 1984-03-30 1985-05-21 Weaver Joe T Wear resistant pump valve
US4573886A (en) * 1979-10-06 1986-03-04 Woma-Apparatebau Wolfgang Massberg & Co. Gmbh Valve assembly for high pressure pump
US20150132157A1 (en) * 2013-11-11 2015-05-14 National Oilwell Varco, L.P. Plunger Pump, Plunger, and Method of Manufacturing Plunger Pump
US9822894B2 (en) * 2013-11-26 2017-11-21 S.P.M. Flow Control, Inc. Valve seats for use in fracturing pumps

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573886A (en) * 1979-10-06 1986-03-04 Woma-Apparatebau Wolfgang Massberg & Co. Gmbh Valve assembly for high pressure pump
US4518329A (en) * 1984-03-30 1985-05-21 Weaver Joe T Wear resistant pump valve
US20150132157A1 (en) * 2013-11-11 2015-05-14 National Oilwell Varco, L.P. Plunger Pump, Plunger, and Method of Manufacturing Plunger Pump
US9822894B2 (en) * 2013-11-26 2017-11-21 S.P.M. Flow Control, Inc. Valve seats for use in fracturing pumps

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