A high temperature and high pressure wear-resistant hard seal flat gate valve

Abstract

The present invention discloses a high-temperature and high-pressure wear-resistant hard-sealed flat gate valve, which relates to the field of flat gate valves and is designed to solve the problems of serious wear on the sealing surface of the flat gate valve, impurity obstruction, and sediment affecting the sealing. It includes two valve seat assemblies arranged on both sides of the gate plate, the valve seat assembly includes a valve seat plate with a flow channel hole and a valve seat sealing layer, the valve seat sealing layer is located on the inner end surface of the valve seat plate close to the gate plate, and the valve seat sealing layer is in contact with the gate plate sealing layer and forms a sealing match; the valve seat sealing layer and the gate plate sealing layer are both in the shape of having a flow channel hole inside, and the areas of the two are respectively between 50% and 75% of the working surface area of ​​the gate plate. The area of ​​the valve seat sealing layer and the gate plate sealing layer is greatly increased, and the gate plate sealing layer and the valve seat sealing layer are always in close contact during the opening and closing process. The force per unit area of ​​the sealing surface is small, and the relative wear during the opening and closing process of the valve is reduced, which greatly reduces the wear of the sealing pair, making the valve seal more reliable and having a long service life.

Description

Technical Field

[0001] The invention relates to the field of gate valves, in particular to a high-temperature and high-pressure wear-resistant hard-sealed flat gate valve. Background Art

[0002] High temperature and high pressure wear-resistant hard-sealed flat gate valve is suitable for medium with particles such as oil slurry, coal slurry, coal powder, coal slag, black water and gray water, and it can connect or cut off the medium in the pipeline system. However, at present, hard-sealed flat gate valve still has many disadvantages: 1. The sealing surface between the valve seat and the gate is usually an arc shape located on the outer periphery of the flow channel. Under high temperature and high pressure conditions, the force per unit area is large, and the sealing surface of the valve is severely worn when opening and closing, which affects the life of the sealing surface; 2. Hard and soft impurities such as welding slag, fiber, particles, metal wire, etc. will be stuck between the valve seat and the gate sealing surface, causing the valve to be unable to be used normally, and there will be wear on the sealing surface; 3. During the opening and closing process of the valve, the valve sealing surface is in contact with the medium for a long time (except for the necessary contact in the flow channel), and the medium will enter the valve body cavity in large quantities. When the valve is not opened and closed for a long time, sediment will be generated, which will affect the seal. Summary of the invention

[0003] Purpose of the invention: In order to overcome the defects of the prior art, the present invention provides a high-temperature and high-pressure wear-resistant hard-sealed flat gate valve to solve the problems of severe wear of the sealing surface, impurity obstruction, and sediment affecting the sealing of the hard-sealed flat gate valve at this stage.

[0004] The technical solution of the present invention comprises a gate and a valve body, wherein the gate is provided with a gate working surface and a gate sealing layer, wherein the gate sealing layer is located on the gate working surface, wherein a flow channel for medium circulation and a valve body cavity outside the flow channel are provided in the valve body, and further comprises two valve seat assemblies respectively arranged on both sides of the gate, wherein the valve seat assembly comprises a valve seat plate having a flow channel hole and a valve seat sealing layer, wherein the valve seat sealing layer is located on the inner end surface of the valve seat plate close to the gate, and the valve seat sealing layer contacts the gate sealing layer and forms a sealing fit; the valve seat sealing layer and the gate sealing layer are both in a shape having a flow channel hole inside, and the areas of the two are respectively between 50% and 75% of the area of ​​the gate working surface.

[0005] By adopting the above technical scheme, the area of ​​the valve seat sealing layer and the gate sealing layer is greatly increased. During the opening and closing process, the gate sealing layer and the valve seat sealing layer are always in close contact, the force per unit area of ​​the sealing surface is small, and the relative wear during the opening and closing process of the valve is reduced, so that the wear of the sealing pair is greatly reduced during the opening or closing process of the valve, making the valve seal more reliable and extending the service life.

[0006] The present invention is further configured such that the edges of the valve seat sealing layer and the gate plate sealing layer are both in a right-angle shape.

[0007] By adopting the above-mentioned further arrangement, both the gate sealing layer and the valve seat sealing layer are processed into right angles, which can effectively shear impurities during the opening and closing process of the gate, and can cut off hard and soft impurities in the flow channel such as welding slag, fibers, particles, metal wires and other impurities, and can effectively prevent impurities from being stuck between the valve seat sealing layer and the gate sealing layer, causing the valve to be unable to be used normally.

[0008] The present invention is further provided that: the material of the valve seat sealing layer and the gate plate sealing layer is ultrasonically sprayed tungsten carbide, and the hardness thereof has a HRC≥60.

[0009] With the above further configuration, the material has excellent properties of wear resistance, corrosion resistance, heat resistance, etc.

[0010] The present invention is further configured as follows: a plurality of compensation spring holes are evenly distributed around the outer periphery of the flow channel hole of the valve seat plate, the compensation spring holes are located on the outer end surface of the valve seat plate away from the gate plate, a compensation spring is installed in the compensation spring hole, and two ends of the compensation spring are respectively abutted against the valve seat plate and the valve body.

[0011] By further configuring the above, the compensation spring has a greater compensation function, the gate always floats between the valve seat assemblies on both sides, and the sealing surfaces of the gate sealing layer and the valve seat sealing layer are automatically and tightly contacted at all times by relying on the thrust of the medium and the compensation spring, so that the valve can still maintain a good sealing state.

[0012] The present invention is further configured as follows: a plurality of compression spring holes are provided on the outer end surface of the valve seat plate, wherein the compression spring holes are located close to the edge of the valve seat plate, and a compression spring in a compressed state is provided in the compression spring holes, and the two ends of the compression spring are respectively abutted against the valve seat plate and the valve body.

[0013] By adopting the above-mentioned further arrangement, the valve seat plate limits and protects the gate plate, and the compression spring presses the valve seat plate tightly against the gate plate, so that the sealing between the two is more reliable, preventing a large amount of medium from entering the valve cavity, avoiding other contacts between the sealing surface and the medium except the necessary contact with the flow channel, and avoiding the formation of deposits that affect the sealing when the valve is not opened and closed for a long time. The valve can make the valve seat assembly in close contact with the gate plate and keep the valve body cavity clean for a long time.

[0014] The present invention is further provided with: a limit rod is fixedly mounted on the bottom corner of the inner end surface of the valve seat plate, and the limit rods of the two valve seat plates on both sides of the gate plate are coaxially contacted.

[0015] By further configuring the above, under the action of the compression spring, the two limit rods are in contact with each other to avoid excessive force of the compression spring, which may cause the valve seat plate to become stuck, thereby ensuring appropriate torque.

[0016] The present invention is further provided with: the valve seat assembly also includes a valve seat outer ring, the valve seat outer ring is integrally connected to the valve seat plate, and the valve seat outer ring is outer-circuited with a disc spring, a spring seat and a plurality of graphite sealing rings for sealing.

[0017] By adopting the above-mentioned further arrangement, the joint between the valve seat assembly and the valve body is kept sealed to prevent the medium from entering.

[0018] The present invention is further provided that: the outer shapes of the valve seat sealing layer and the gate plate sealing layer are polygonal shapes.

[0019] The above-mentioned further configuration is adopted, and the shape is similar to that of the gate working surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of a specific embodiment of the present invention;

[0021] Figure 2 For the present invention Figure 1 The structural diagram at A in the middle;

[0022] Figure 3 is a three-dimensional cross-sectional view of a specific embodiment of the present invention;

[0023] Figure 4 An exploded schematic diagram of the gate and valve seat assembly of the present invention;

[0024] Among them, the gate 1, the valve body 2, the valve seat assembly 3, the gate working surface 11, the gate sealing layer 12, the flow channel 21, the valve body cavity 22, the valve seat plate 31, the valve seat sealing layer 32, the flow channel hole 33, the compensation spring hole 34, the compensation spring 35, the clamping spring hole 36, the clamping spring 37, the limit rod 38, the valve seat outer ring 39, the disc spring 391, the spring seat 392, and the graphite sealing ring 393. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 4A high-temperature and high-pressure wear-resistant hard-sealed flat gate valve shown in the figure comprises a gate 1, a valve body 2 and two valve seat assemblies 3 arranged on both sides of the gate 1. A gate working surface 11 and a gate sealing layer 12 are arranged on the gate 1. The gate working surface 11 is the two end surfaces of the gate 1 that directly contact the medium. The gate sealing layer 12 is located on the gate working surface 11. A flow channel 21 for medium circulation and a valve body cavity 22 outside the flow channel 21 are opened in the valve body 2. The valve seat assembly 3 comprises a valve seat plate 31 and a valve seat sealing layer 32. The valve seat plate 31 has a flow channel hole 33 for medium to pass through. The valve seat sealing layer 32 is located on the inner end surface of the valve seat plate 31 close to the gate 1, and the valve seat sealing layer 32 contacts the gate sealing layer 12 to form a sealing fit; the valve seat sealing layer 32 and the gate sealing layer 12 are both polygonal in shape, and a flow channel hole 33 is opened in the polygonal shape, and the areas of the two are respectively between 50% and 75% of the area of ​​the gate working surface 11. The gate sealing layer 12 and the valve seat sealing layer 32 are both continuous planes extending outward from the middle to close to their respective outer edges, which are similar in shape to the gate working surface 11 and are smaller in size. The gate sealing layer 12 and the valve seat sealing layer 32 have the same area. During the opening and closing process, the gate sealing layer 12 and the valve seat sealing layer 32 are always in close contact, the force per unit area of ​​the sealing surface is small, and the relative wear during the opening and closing process of the valve is reduced.

[0026] The edges of the valve seat sealing layer 32 and the gate sealing layer 12 are both in a right-angle shape, and the right-angle shape can shear impurities during the opening and closing process of the gate.

[0027] The valve seat sealing layer 32 and the gate sealing layer 12 are made of ultrasonically sprayed tungsten carbide, whose hardness HRC≥60. The material has excellent properties of high hardness, wear resistance, corrosion resistance, heat resistance and the like.

[0028] Eight to thirty compensation spring holes 34 are evenly distributed around the flow channel hole 33 of the valve seat plate 31. The compensation spring holes 34 are located on the outer end surface of the valve seat plate 31 away from the gate plate 1. Compensation springs 35 are installed in the compensation spring holes 34. The two ends of the compensation spring 35 are respectively abutted against the valve seat plate 31 and the valve body. The compensation spring 35 can elastically compensate the sealing surface. The overall valve seat assembly 3 is movable, so that the sealing surfaces of the gate plate sealing layer 12 and the valve seat sealing layer 32 are always automatically in close contact.

[0029] The outer end surface of the valve seat plate 31 is also provided with a plurality of compression spring holes 36, which are located near the edge of the valve seat plate 31. A compression spring 37 in a compressed state is arranged in the compression spring hole 36, and the two ends of the compression spring 37 are respectively in contact with the valve seat plate 31 and the valve body. The compression spring 37 forces the valve seat plate 31 to be pressed tightly against the gate plate 1, making the seal tighter, preventing a large amount of medium from entering the valve cavity 22, and keeping the valve cavity 22 clean for a long time.

[0030] A limit rod 38 is fixedly installed on the bottom corner of the inner end surface of the valve seat plate 31, and the limit rods 38 of the two valve seat plates 31 on both sides of the gate plate are coaxially contacted. Under the action of the compression spring 36, the contact of the two limit rods 38 can avoid excessive force of the compression spring 36, ensure appropriate torque, and open and close the gate plate 1.

[0031] The valve seat assembly 3 also includes a valve seat outer ring 39, which is integrally connected to the valve seat plate 31. The valve seat outer ring 39 is outer-circuited with a disc spring 391, a spring seat 392 and a plurality of graphite sealing rings 393 for sealing; the disc spring 391 elastically presses the graphite sealing ring 393 to enhance the sealing performance.

Claims

1. A high-temperature and high-pressure wear-resistant hard-sealed flat gate valve, comprising a gate and a valve body, wherein the gate is provided with a gate working surface and a gate sealing layer, wherein the gate sealing layer is located on the gate working surface, and wherein a flow channel for medium circulation and a valve body cavity outside the flow channel are provided in the valve body, wherein: It also includes two valve seat assemblies arranged on both sides of the gate plate, the valve seat assembly includes a valve seat plate with a flow channel hole and a valve seat sealing layer, the valve seat sealing layer is located on the inner end surface of the valve seat plate close to the gate plate, and the valve seat sealing layer is in contact with the gate plate sealing layer to form a sealing fit; the valve seat sealing layer and the gate plate sealing layer are both shaped with a flow channel hole inside, and the areas of the two are respectively between 50% and 75% of the area of ​​the gate plate working surface; The edges of the valve seat sealing layer and the gate plate sealing layer are both in a right-angle shape; the material of the valve seat sealing layer and the gate plate sealing layer is ultrasonically sprayed tungsten carbide, and its hardness HRC≥60; a number of compensation spring holes are evenly distributed around the periphery of the flow channel hole of the valve seat plate, and the compensation spring holes are located on the outer end surface of the valve seat plate away from the gate plate, and a compensation spring is installed in the compensation spring hole, and the two ends of the compensation spring are respectively abutted on the valve seat plate and the valve body; a number of clamping spring holes are also opened on the outer end surface of the valve seat plate, and the clamping spring holes are located on the edge of the valve seat plate. A compression spring in a compressed state is arranged in the clamping spring hole, and the two ends of the compression spring are respectively abutted on the valve seat plate and the valve body; A limit rod is fixedly installed on the bottom corner of the inner end surface of the valve seat plate, and the limit rods of the two valve seat plates on both sides of the gate plate are coaxially contacted; the valve seat assembly also includes a valve seat outer ring, which is integrally connected to the valve seat plate, and the valve seat outer ring is outer-circuited with a disc spring, a spring seat and a plurality of graphite sealing rings for sealing.

2. The high temperature and high pressure wear-resistant hard-sealed flat gate valve according to claim 1 is characterized in that: The valve seat sealing layer and the gate plate sealing layer have polygonal shapes.

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