Valve assembly
By designing the line contact between the hemispherical valve body and the valve gasket, and the structure of the buffer gasket, the problems of sand jamming and sealing failure in oilfield drilling and fracturing operations of ball valves have been solved, improving sealing performance and service life, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional ball valves are prone to sand jamming during oilfield drilling and fracturing operations due to the contact between the steel ball and the ball cap, leading to sealing failure, short service life, high production costs, and operational interruptions.
A valve assembly is designed, which adopts a hemispherical valve body and valve gasket sealing structure. The fluid forms a line contact through the drain hole. Combined with a buffer gasket and O-ring, it reduces sand jamming and improves sealing performance and service life.
It enables the smooth passage of particulate media, reduces damage to the hemispherical valve body, extends service life, lowers production costs, and avoids operational interruptions.
Smart Images
Figure CN224049705U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to oilfield drilling equipment technical field especially relates to a valve assembly. BACKGROUND
[0002] In the process of oilfield drilling fracturing operation, the traditional ball valve assembly bears high pressure fluid (acidification, quartz sand, etc.) scouring and erosion under very bad working conditions for a long time, the fluid is pushed away from the valve seat bottom under the action of negative pressure, the steel ball is opened upward, the steel ball hits the upper plane of the ball pressure cap, the long-term collision between the steel ball and the ball pressure cap metal surface can easily cause the surface (sealing surface) of the steel ball to be damaged, leading to sealing failure, reducing the service life of the ball valve, and increasing the consumption cost of fracturing operation. SUMMARY
[0003] The utility model discloses a valve assembly to solve the above-mentioned prior art problems, particle medium passes fluently, reduces the phenomenon of sand jamming, improves the sealing property, has long service life and reduces production cost.
[0004] To achieve the above object, the utility model provides the following scheme:
[0005] The utility model provides a valve assembly, which comprises a valve cover, a valve seat, a half-ball valve body and a valve rubber pad, the valve cover and the valve seat are detachably and sealingly connected, the valve rubber pad is fixedly installed in the interior of the valve seat, the half-ball valve body is arranged in the interior of the valve cover, the bottom surface of the half-ball valve body is semispherical, under the pressureless state, the half-ball valve body is in free fall and sealingly attached to the valve rubber pad, a plurality of liquid discharge holes for passing fluid are formed in the side wall of the valve cover, and each of the liquid discharge holes is formed into a sharp end at the intersection in the interior of the valve cover, and the outer side surface of the half-ball valve body is in linear contact with each of the sharp ends.
[0006] Preferably, the valve cover and the valve seat are threadedly connected.
[0007] Preferably, the half-ball valve body comprises a valve body and a buffer rubber pad, the buffer rubber pad is fixedly arranged on the top of the valve body, and when the fluid is pushed by the half-ball valve body under the action of negative pressure, the buffer rubber pad can be sealingly attached to the inner side surface of the top end of the valve cover.
[0008] Preferably, the valve body comprises a connecting section, a cylindrical section and a hemispherical section connected in sequence, the buffer pad is sleeved outside the connecting section, the outer side of the cylindrical section and the outer side of the buffer pad can be attached to the inner side of the valve cover, and an inner concave groove is arranged at the bottom of the hemispherical section.
[0009] Preferably, a plurality of exhaust holes are arranged on the top surface of the valve cover.
[0010] Preferably, a gasket is arranged above the valve rubber pad, and the side of the gasket away from the valve rubber pad can be in sealing contact with the bottom end surface of the valve cover.
[0011] Preferably, two sealing grooves are arranged on the outer side of the end of the valve seat away from the valve cover, and O-shaped sealing rings are arranged in the sealing grooves.
[0012] Preferably, the number of the liquid discharge holes is four.
[0013] Preferably, the liquid discharge hole is a rectangular liquid discharge hole inclined towards the valve seat, and the four corners of the rectangular liquid discharge hole are all transitioned into round corners.
[0014] Preferably, a liquid guide groove is arranged at the bottom of the rectangular liquid discharge hole, and the included angle between the liquid guide groove and the side wall of the rectangular liquid discharge hole is 25°.
[0015] The utility model discloses the following technical effects are obtained relative to the prior art:
[0016] The utility model provides a valve assembly, the intersection of two adjacent liquid discharge holes in the valve cover forms a tip, when throwing the ball operation of the particle of uneven size, the outer side of the hemispherical valve body and each tip form line contact, can reduce the phenomenon of sand jamming of the hemispherical valve body and the valve cover, and the particle medium passes smoothly, reduces the damage to the hemispherical valve body, improves the service life, can also seal the empty pump, avoids the interruption of the whole fracturing operation, and reduces production cost. ACCURACY
[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawing needed to be used in the embodiments, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0018] Figure 1 It is a structure schematic view of the valve assembly;
[0019] Figure 2 It is a sectional view of the valve cover;
[0020] Figure 3 This is a cross-sectional view of the valve cover in the prior art.
[0021] In the diagram: 1-valve cover; 2-buffer pad; 3-spherical valve body; 4-valve seat; 5-washer; 6-valve pad; 7-O-ring seal; 8-drain hole; 9-vent hole; 10-tip; 11-liquid guide groove. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] The purpose of this utility model is to provide a valve assembly to solve the problems existing in the prior art, allowing particulate media to pass smoothly, reducing sand jamming, improving sealing performance, extending service life, and reducing production costs.
[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0025] This utility model provides a valve assembly, such as Figures 1-2 As shown, the valve includes a valve cover 1, a valve seat 4, a hemispherical valve body 3, and a valve gasket 6. The valve cover 1 and the valve seat 4 are detachably and sealed together. The valve gasket 6 is fixedly installed inside the valve seat 4. The hemispherical valve body 3 is located inside the valve cover 1. The bottom surface of the hemispherical valve body 3 is hemispherical. In the unpressurized state, the hemispherical valve body 3 is in free fall and seals against the valve gasket 6. The side wall of the valve cover 1 has multiple drainage holes 8 for fluid to pass through. Two adjacent drainage holes 8 intersect inside the valve cover 1 to form a tip 10. The outer surface of the hemispherical valve body 3 forms line contact with each tip 10. When the hemispherical valve body 3 is working, the valve cover 1 serves to guide its vertical movement and limit the opening height of the hemispherical valve body 3. In a pressureless state, the hemispherical valve body 3 is in free fall and in a sealed state with the valve rubber. The maximum height of the hemispherical valve body 3 corresponds to the fluid flow rate. When the valve assembly is working, the fluid, under negative pressure, pushes the hemispherical valve body 3 upwards from the bottom of the valve seat 4, allowing the fluid to enter the upper liquid chamber. When the upper liquid chamber is subjected to reaction pressure, it forces the hemispherical valve body 3 to slide down and close instantly. At this time, the outer spherical surface (working surface) of the hemispherical valve body 3, under pressure, forms a seal with the buffer valve rubber gasket 6, thus forming a one-way closed valve. The higher the reaction pressure on the upper liquid chamber, the better its sealing performance. Figure 3As shown, the steel ball of the existing ball valve assembly and the valve cover 1 are in surface contact, and the contact surface is prone to sand jamming. The valve assembly of the embodiment forms a sharp end 10 at the intersection of the two adjacent liquid discharge holes 8 inside the valve cover 1. When the ball throwing operation of particles of different sizes is performed, the outer side surface of the half-ball valve body 3 and each sharp end 10 form a line contact, which can reduce the sand jamming phenomenon of the half-ball valve body 3 and the valve cover 1, and the particle medium flows smoothly, reducing the damage to the half-ball valve body and improving the service life. It can also seal the empty pump and avoid interrupting the overall fracturing operation. Moreover, the manufacturing cost of the half-ball valve body 3 is one-third of that of the traditional ball valve steel ball, further reducing the production cost.
[0026] It is further preferred in the embodiment of the utility model that the valve cover 1 is threadedly connected with the valve seat 4. After high-pressure operation, the valve cover 1 and the valve seat 4 connected by threads are easy to disassemble and assemble.
[0027] It is further preferred in the embodiment of the utility model that the half-ball valve body 3 comprises a valve body and a buffer rubber pad 2. The buffer rubber pad 2 is fixedly arranged on the top of the valve body. When the fluid is pushed by the negative pressure to push the half-ball valve body 3, the buffer rubber pad 2 can be tightly attached to the inner side surface of the top end of the valve cover 1. When the fluid is pushed away from the bottom of the valve seat 4 by the suction force of the plunger pump to open upward, the half-ball valve body 3 quickly hits the upper plane inside the valve cover 1. The buffer rubber pad 2 is used to collide with the metal surface of the valve cover 1, avoiding the damage of the surface (sealing surface) of the valve body, and ensuring good sealing performance.
[0028] It is further preferred in the embodiment of the utility model that the valve body comprises a connecting section, a cylindrical section and a half-ball section connected in sequence. The buffer pad is fixedly arranged outside the connecting section. The outer side surface of the cylindrical section and the outer side surface of the buffer rubber pad 2 can be tightly attached to the inner side surface of the valve cover 1. The bottom of the half-ball section is provided with an inner concave groove.
[0029] It is further preferred in the embodiment of the utility model that the top surface of the valve cover 1 is provided with a plurality of exhaust holes 9.
[0030] It is further preferred in the embodiment of the utility model that the valve assembly further comprises a gasket 5. The gasket 5 is arranged above the valve rubber pad 6. The side of the gasket 5 away from the valve rubber pad 6 can be tightly attached to the bottom end surface of the valve cover 1, enhancing the sealing performance of the connection.
[0031] It is further preferred in the embodiment of the utility model that the outer side surface of the end of the valve seat 4 away from the valve cover 1 is provided with two sealing grooves. The sealing grooves are provided with O-shaped sealing rings 7.
[0032] It is further preferred in the embodiment of the utility model that the number of the liquid discharge holes 8 is four. The opening of the liquid discharge hole 8 is large, which can throw large particle media, avoiding interrupting the overall fracturing operation and causing waste of production resources.
[0033] Further preferably in the embodiments of the utility model, the drain hole 8 is a rectangular drain hole 8 inclined towards the valve seat 4, the four corners of the rectangular drain hole 8 are all transition round corners, the bottom of the rectangular drain hole 8 is provided with a liquid guide groove 11, and the included angle between the liquid guide groove 11 and the side wall of the rectangular drain hole 8 is 25 °, which can maximize the guarantee of smooth drainage.
[0034] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the utility model, the specific implementation mode and application range will all have changes. In conclusion, the content of the specification should not be understood as the limitation of the utility model.
Claims
1. A valve assembly, characterized by: The valve cover is detachably and sealingly connected with the valve seat, the valve rubber pad is fixedly installed inside the valve seat, the hemispherical valve body is arranged inside the valve cover, the bottom surface of the hemispherical valve body is in a hemispherical shape, under a pressureless state, the hemispherical valve body is in free fall and sealingly abuts against the valve rubber pad, a plurality of liquid discharge holes for passing fluid are arranged on the side wall of the valve cover, and adjacent two liquid discharge holes form a sharp end at the intersection inside the valve cover, and the outer side surface of the hemispherical valve body forms linear contact with each sharp end.
2. The valve assembly of claim 1, wherein: The valve cover is threadedly connected with the valve seat.
3. The valve assembly of claim 1, wherein: The hemispherical valve body comprises a valve body and a buffer rubber pad, the buffer rubber pad is fixedly arranged on the top of the valve body, and the buffer rubber pad can sealingly abut against the inner side surface of the top end of the valve cover when the hemispherical valve body is pushed by fluid under negative pressure.
4. The valve assembly of claim 3, wherein: The valve body comprises a connecting section, a cylindrical section and a hemispherical section which are sequentially connected, the buffer pad is fixedly sleeved outside the connecting section, the outer side surface of the cylindrical section and the outer side surface of the buffer rubber pad can abut against the inner side surface of the valve cover, and the bottom of the hemispherical section is provided with an inner concave spherical groove.
5. The valve assembly of claim 1, wherein: The top surface of the valve cover is provided with a plurality of exhaust holes.
6. The valve assembly of claim 1, wherein: A gasket is further arranged above the valve rubber pad, and the side of the gasket away from the valve rubber pad can sealingly contact the bottom end surface of the valve cover.
7. The valve assembly of claim 1, wherein: The outer side surface of the end of the valve seat away from the valve cover is provided with two sealing grooves, and the sealing grooves are provided with O-shaped sealing rings.
8. The valve assembly of claim 1, wherein: The number of the liquid discharge holes is four.
9. The valve assembly of claim 1, wherein: The liquid discharge hole is a rectangular liquid discharge hole inclined toward the valve seat, and four corners of the rectangular liquid discharge hole are all transitioned into round corners.
10. The valve assembly of claim 9, wherein: The bottom of the rectangular liquid discharge hole is provided with a liquid guide groove, and the included angle between the liquid guide groove and the side wall of the rectangular liquid discharge hole is 25°.