CN116480818A - Straight-through lifting type check valve - Google Patents

Abstract

A straight-through type lifting type uniflow valve adopts forging blanks of valve bodies and valve covers of existing high-pressure or ultrahigh-pressure lifting type uniflow valves, and matched sealing elements and connectors; the valve cavity in the valve body is a blind hole valve cavity with a square round corner section, and the inlet and outlet passage holes of the valve body are vertically communicated with the blind hole valve cavity; an integrated valve seat is deposited at the inner end of the valve body inlet channel; an inclined hole is drilled between the valve cavity and the outlet passage hole; a valve body, a valve cover and a valve cavity closed by a sealing gasket ring and a stud nut are provided with a valve core assembly, wherein the valve core assembly is provided with an elliptical pit on the upper part, a guide rod and a compression spring, an inclined plane on the lower part, four telescopic pins on the left side and a sealing plug on the right side. And the sealing plugs on the right side of the integrated valve seat and the valve core are all overlaid with high nickel-chromium-molybdenum alloy ER625 materials. Compared with a frequently used high-pressure or ultrahigh-pressure lifting type single-flow valve, the valve has the characteristics of smooth flow passage, reduced energy consumption and economy and durability.

Description

A straight-through lifting check valve

technical field

The invention relates to a check valve in industrial machinery, fluid equipment or pipelines.

Background technique

At present, a variety of check valves are used in fluid equipment or pipelines, but high-pressure or ultra-high-pressure lift-type check valves are often used in oil and gas drilling equipment and kill manifolds. The flow channels are tortuous and changeable, and there is a right-angle steering, so the flow resistance is large and energy consumption is large. Under the erosion of ultra-high pressure sandy media, the parts wear quickly and the service life is short; it is not conducive to reducing the cost of oil and natural gas extraction.

Contents of the invention

According to the principle of fluid mechanics, the present invention redesigns the existing lift check valve, and provides a lift check valve with full diameter and straight-through channel, which is suitable for high pressure or ultra-high pressure working conditions.

The present invention adopts the forging blank of the valve body and bonnet of the existing high-pressure or ultra-high-pressure lifting check valve, as well as the matching seals and connecting pieces; the difference is: the valve cavity in the valve body is a blind hole valve cavity with a square rounded section, and the inlet and outlet channel holes of the valve body are vertically connected with the blind hole valve cavity; at the inner end of the inlet channel of the valve body, there is an integrated valve seat; between the valve cavity and the outlet channel hole, there is an oblique hole drilled; It is equipped with a guide rod and a compression spring in an elliptical pit above, an inclined plane below, a plane with four telescopic pins on the left, and a spool assembly of a sealing plug on the right.

The material of the surfacing integrated valve seat is: high-nickel-chromium-molybdenum alloy ER625, and the annular slope or arc surface of the sealing plug on the right side of the valve core is also surfacing with high-nickel-chromium-molybdenum alloy ER625 material.

Because the valve core assembly with unique structure is installed in the closed valve cavity of the present invention, when working, because the area of the inclined plane below the valve core is larger than the plane area above, the inclined plane itself will generate a component force pushing upwards; in addition, the diversion of the inclined hole between the valve cavity and the outlet channel hole makes the fluid speed above the valve core greater than that below, so the pressure difference and upward lift will be formed; Clear the access hole completely so that it is unobstructed. When the pressure in the inlet channel hole disappears, under the thrust of the compression spring, the valve core will quickly move downwards, and under the push of the four expansion pins and the backflow fluid pressure, it will fit and seal with the integrated valve seat; therefore, it has the advantages of large flow area, small flow resistance, less wear of the valve core and long service life. In addition, the integrated valve seat and the sealing plug on the right side of the valve core of the present invention are all surfacing welding high-nickel-chromium-molybdenum alloy ER625 materials, which have super wear resistance and erosion resistance, thus prolonging the service life of the product and improving the use efficiency of users.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a commonly used lifting check valve;

Fig. 2 is when the valve of the present invention is closed, the schematic diagram of the full section of overall structure;

Fig. 3 is an enlarged schematic diagram of the structure with a partial section in the A direction after the bonnet is removed in Fig. 2;

Fig. 4 is an enlarged schematic diagram of the structure of the left side of the spool part in direction B in Fig. 2 .

The names of parts and components shown in the accompanying drawings are as follows:

1. Valve body, 2. Integrated valve seat, 3. Valve core, 4. Guide rod, 5. Compression spring, 6. Valve cover, 7. Gasket ring, 8. Stud nut, 9. Inclined hole, 10. Small spring, 11. Telescopic pin.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

The present invention adopts the forging blanks of the valve body and valve cover of the existing high-pressure or ultra-high-pressure lifting check valve, as well as the matching seals and connecting parts; redesigns and processes the partial structure and built-in parts of the valve body and valve cover forgings, which can reduce production costs and improve production efficiency.

The valve body 1 of the present invention is a three-way part, with a cylinder in the middle, and necked flanges protruding from the left and right ends; inside the middle cylinder, a blind hole valve chamber with the same size and square fillet section is processed from top to bottom; a trapezoidal gasket ring groove and uniform threaded blind holes are processed on the upper surface of the middle cylinder, which are used to connect the valve cover 6; Shaped ring groove and evenly distributed stud holes are used for external connection; between the valve body 1 blind hole valve cavity and the outlet passage hole, an oblique hole 9 is drilled for flow diversion and pressure relief. The fluid medium of the present invention enters from the inlet channel hole in the center of the neck flange on the right side of the valve body 1, and is discharged from the outlet channel hole in the center of the neck flange on the left side after passing through the integrated valve seat 2 and pushing the valve core 3 upward.

The integrated valve seat 2 of the present invention is made of anti-corrosion and wear-resistant hard alloy material, and is directly surfacing on the inner port of the inlet channel of the valve body 1. Compared with the traditional independent inlaid valve seat parts, it has the advantages of low cost and good sealing. The material of the surfacing integrated valve seat 2 is: high-nickel-chromium-molybdenum alloy ER625, and the wall thickness of the integrated valve seat 2 after cutting is greater than or equal to 3 mm to ensure its service life.

The spool 3 of the present invention is an irregular block part, the four sides of which are slidably matched with the blind hole valve chamber of the valve body 1 with a square fillet cross-section, so as to prevent it from deviating from the integrated valve seat 2 when it goes down; the spool 3 is processed with an elliptical pit for installing the guide rod 4 and the compression spring 5, the bottom is a slope, the left side is a plane with four telescopic pins 11, and the right side is a sealing plug; Four symmetrical small blind holes with the same depth are drilled on both sides of the valve body 1 outlet channel hole. Four small springs 10 and telescopic pins 11 of the same size are installed in the small blind holes to push the valve core 3 to match the integrated valve seat 2. On the vertical bisector of the left plane, there is also a drain hole connected to the bottom of the elliptical pit above the valve core to prevent sand and dust from clogging. The thickness of the final welding layer should be greater than or equal to 2.5 mm to make it durable.

The guide rod 4 of the present invention, the upper end is a cone, the lower end is a waistcoat, and the middle is a cylinder, which is inserted into the lower end of the compression spring 5 and installed together in the elliptical pit above the spool 3;

The compression spring 5 of the present invention is a conventional spring part, and its steel wire is thinner, and its elastic force is to push the valve core 3 to overcome the frictional resistance of the telescopic pin 11, and return to its position quickly.

The bonnet 6 of the present invention is provided with a flow direction mark of the check valve on it, and a trapezoidal gasket groove, a boss and a central blind hole are processed below it, and uniformly distributed stud holes are processed on its periphery, so that the gasket ring 7 and the stud nut 8 are connected and fixed with the top of the valve body 1; the central blind hole below the bonnet 6 is sleeved on the upper end of the compression spring 5 to prevent its displacement.

Claims (5)

1. A straight-through type lifting check valve, which adopts the forging blanks of the valve body and bonnet of the existing high-pressure or ultra-high pressure lift check valve, as well as supporting seals and connecting parts; its characteristics are: the valve cavity in the valve body is a blind hole valve cavity with a square rounded section, and the inlet and outlet passage holes of the valve body are vertically connected with the blind hole valve cavity; at the inner end of the inlet passage of the valve body, there is an integrated valve seat; 1. In the valve cavity closed by the stud nut, there is a spool assembly with a guide rod and a compression spring in an oval pit above, a slope below, a plane with four telescopic pins on the left, and a sealing plug on the right. 2. The straight-through lifting check valve according to claim 1, characterized in that: the material of the surfacing integrated valve seat is: high-nickel-chromium-molybdenum alloy ER625, and the wall thickness of the integrated valve seat after cutting is greater than or equal to 3 mm. 3. The straight-through lifting check valve according to claim 1, characterized in that: the valve core is an irregular square part, and the four sides are slidingly matched with the blind hole valve chamber of the valve body with a square round corner section. 4. The straight-through lifting check valve according to claim 1, characterized in that: on the plane on the left side of the spool, on both sides of the outlet passage hole of the valve body, four symmetrical small blind holes with the same depth are drilled, and four small springs and telescopic pins of the same size are installed in the small blind holes; on the vertical bisector of the left plane, there is also a drain hole communicating with the bottom of the elliptical pit above the spool. 5. The straight-through lifting check valve according to claim 1, characterized in that: on the annular inclined surface or arc surface of the sealing plug on the right side of the valve core, high-nickel-chromium-molybdenum alloy ER625 material is surfacing, and the thickness of the welding layer after cutting should be greater than or equal to 2.5 mm.