Combined plate type dual-seal slag separation valve

Abstract

The invention relates to the technical field of valves, and discloses a combined plate type double-seal slag isolation valve which comprises a valve body, an upper valve cover and a bottom cover, the upper valve cover and the bottom cover are installed on the upper side of the valve body, the valve body is integrally composed of a main body valve body, an upper side valve body and a lower side valve body, a valve seat is arranged in the main body valve body, and a gate plate is arranged in the valve seat in a sliding mode. The gate plate is provided with an overflowing hole, the bottom cover and the lower side valve body are combined into a shell with an abutting plate cavity, a left abutting plate and a right abutting plate are symmetrically arranged in the abutting plate cavity, and the gate plate slides between the left abutting plate and the right abutting plate. Medium particles and residues in a pipeline cannot enter the inner cavity of the valve body through the overflowing hole to be deposited and accumulated, so that the flashboard is blocked, the flashboard can be freely opened and closed up and down to effectively work, the split valve body structure is adopted, later maintenance and cleaning are facilitated, meanwhile, double-layer sealing is arranged, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a combined plate type double-sealed slag isolation valve. Background Art

[0002] The flat gate valve has the characteristics of light torque, compact structure, good sealing performance and low cost. For pipelines with clean media, the flat gate valve has become the first choice for pipeline cut-off valves due to its excellent performance characteristics. It is widely used in long-distance pipelines of light oil, natural gas and other energy sources. However, for newly mined crude oil and heavy oil pipelines, the media contains more sand, particles and slag. For these media, the existing conventional flat gate valves are not competent. Figure 1-2 As shown in the figure, during the process of the gate moving up and down to open and close, an open channel is formed between the gate flow hole and the valve seat. Due to the fast flow rate of the medium, it quickly enters the inner cavity of the valve body from the open channel. The sand, particles and slag in the medium quickly accumulate and settle at the bottom of the valve body cavity, piling up higher and higher, resulting in the gate being unable to close and getting stuck. If the forced closing torque is too large, the valve stem will bend and deform, the seal will fail, and the valve will be damaged. Summary of the invention

[0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide a combined plate type double-sealed slag isolation valve, which solves the problem of medium sedimentation and accumulation in conventional flat gate valves, resulting in the gate being stuck.

[0004] Technical Solution

[0005] To solve the above problems, the technical solution provided by the present invention is:

[0006] A combined plate type double-sealed slag isolation valve comprises a valve body, and an upper valve cover and a bottom cover installed on the upper side of the valve body. The valve body is composed of a main valve body, an upper valve body and a lower valve body. A valve seat is provided in the main valve body, a gate plate is slidably provided in the valve seat, and a flow hole is provided on the gate plate. The bottom cover and the lower valve body are combined into a shell with a backing plate cavity, and a left backing plate and a right backing plate are symmetrically provided in the backing plate cavity, and the gate plate slides between the left backing plate and the right backing plate.

[0007] Furthermore, two ends of the gate plate extend out of the valve seat.

[0008] Furthermore, a cylindrical coil spring is provided between the left abutment plate, the right abutment plate and the lower valve body.

[0009] Furthermore, a sealing ring is provided in the valve seat surrounding the gate plate, and a hard sealing coating is provided in the sealing ring of the valve seat.

[0010] Furthermore, scraping rings are provided on the lower sides of the left abutment plate and the right abutment plate.

[0011] Furthermore, the valve stem is connected to the upper side of the gate plate.

[0012] Furthermore, a clamping block matched with the valve seat is provided in the upper valve body, the clamping block clamps the valve stem, and an O-ring is provided between the clamping block and the valve seat.

[0013] Furthermore, a valve stem member is provided on the upper valve body, and the valve stem slides inside the valve stem member.

[0014] Furthermore, a pneumatic actuator is provided on the upper side of the valve stem, and the pneumatic actuator is connected to the valve stem.

[0015] Furthermore, a limit block is provided in the bottom cover, and the limit block is arranged corresponding to the gate plate.

[0016] Beneficial Effects

[0017] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] The technical solution provided by the present invention is arranged by arranging left and right abutment plates. When the gate plate moves, medium particles and slag in the pipeline will not enter the inner cavity of the valve body through the flow hole to precipitate and accumulate, causing the gate plate to be stuck. The gate plate can be opened and closed freely up and down to work effectively, thereby ensuring the sealing performance of the valve. Cylindrical coil springs are connected to the sides of the left and right abutment plates to ensure that the left and right abutment plates will not lock the main gate plate. A split valve body structure is adopted to facilitate subsequent maintenance and cleaning. At the same time, a double-layer seal is arranged to extend the service life of the valve. At the same time, the gate plate cooperates with the limit block to accurately control the closing position of the gate plate to prevent the valve from being too closed and affecting the sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side cross-sectional view of the medium accumulation of a conventional flat gate valve in the background technology;

[0020] Figure 2 It is a partial cross-sectional view of the front side of the medium accumulation of the conventional flat gate valve in the background technology;

[0021] Figure 3 is a side sectional view of embodiment 1 of the present invention;

[0022] Figure 4 It is a partial cross-sectional view of the front side of Example 1 of the present invention;

[0023] Figure 5 It is a side sectional view of the valve body of Example 1 of the present invention;

[0024] Figure 6 It is a partial front cross-sectional view of the valve body of Example 1 of the present invention;

[0025] Figure 7 for Figure 5 The enlarged schematic diagram of point I in the middle;

[0026] Figure 8 for Figure 6 The enlarged schematic diagram of II in the middle;

[0027] Fig. 9 It is a side cross-sectional view of the gate plate during movement of Example 1 of the present invention;

[0028] Fig.10 It is a partial front cross-sectional view of the gate during movement of Example 1 of the present invention. DETAILED DESCRIPTION

[0029] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] Combined with Figure 3-10 A combined plate type double-sealed slag isolation valve comprises a valve body 1, wherein the upper and lower ends of the valve body 1 are respectively connected with an upper valve cover 2 and a bottom cover 3, the valve body 1 is composed of a main valve body 101 located in the middle position and an upper valve body 102 and a lower valve body 103 located on the upper and lower sides of the main valve body 101, the main valve body 101 and the upper and lower valve bodies 102 and 103 are an integral structure, and a flow channel 1011 is provided in the main valve body 101 and runs through the main valve body horizontally, and the flow channel 1011 is used for the flow of the medium controlled by the valve body 1.

[0032] When the valve seat 7 is not set, the main valve body 101 is internally connected with the upper valve body 102 and the lower valve body 103, and is provided with a connecting groove. The connecting groove of the main valve body 101 is set at the center position of the upper valve body 102 and the lower valve body 103, and the valve seat 7 is installed in the connecting groove of the upper and lower valve walls of the main valve body 101. The connecting groove of the main valve body 101 is a stepped structure, and the inner diameter of the connecting groove close to the flow channel 1011 is larger than the spacing of the connecting groove on the outside. Through this stepped groove structure, the valve seat can be inserted and fixed in the connecting groove, and the valve seat 7 and the main valve body 101 can be stably matched.

[0033] The lower valve body 103 is arranged in cooperation with the bottom cover 3, and the bottom cover 3 is fixed to the lower valve body 103 by bolts. At this time, a complete shell with a cavity inside is formed between the bottom cover 3 and the lower valve body 103, and the cavity inside the complete shell formed by the lower valve body 103 and the bottom cover 3 is the backing plate cavity 301.

[0034] A gate plate 4 is provided in the valve seat 7 so as to slide up and down. Both ends of the gate plate 4 extend out of the valve seat. A flow hole 401 is provided in the gate plate 4 .

[0035] A left abutment plate 5 and a right abutment plate 6 are symmetrically arranged in the abutment plate cavity 301, and a distance is provided between the left abutment plate 5 and the right abutment plate 6. The distance between the left abutment plate 5 and the right abutment plate 6 corresponds to the width of the gate plate 4. The gate plate 4 slides between the left abutment plate 5 and the right abutment plate 6 and in the valve seat 7. The gate plate 4 realizes the switching of the blocking state and the flow state of the flow channel 1011 by sliding up and down.

[0036] Spring grooves 151 are provided on the outer sides of the left abutment plate 5 and the right abutment plate 6. Cylindrical coil springs 15 are respectively provided between the left abutment plate 5 and the right abutment plate 6 and the inner wall of the lower valve body 103. One end of the cylindrical coil spring 15 is located at the left abutment plate 5 and the right abutment plate 6 and is inserted into the spring grooves 151 of the left abutment plate 5 and the right abutment plate 6 to limit the position of the cylindrical coil spring 15 to prevent it from shifting and ensure that the elastic force direction of the spring is perpendicular to the left abutment plate 5 and the right abutment plate 6. The cylindrical coil spring 15 is pre-tightened on the back sides of the left abutment plate 5 and the right abutment plate 6 to ensure that the left abutment plate 5 and the right abutment plate 6 can fit the gate plate 4, thereby isolating particles and slag media. The telescopic adjustment space of the cylindrical coil spring 15 ensures that the left abutment plate 5 and the right abutment plate 6 will not lock the main gate plate.

[0037] Through the cooperation between the gate plate 4 and the left abutment plate 5 and the right abutment plate 6, and the flow hole 401 set on the gate plate 4, when the gate plate 4 needs to keep the flow channel 1011 of the valve body 1 in a flow state, the flow hole 401 is aligned with the flow channel 1011, and the medium in the valve body 1 can smoothly pass through the flow channel 1011 and the flow hole 401. At this time, the valve body 1 is in a flow state.

[0038] When the valve body 1 needs to block the flow of the internal medium, the gate plate 4 slides downward, and the gate plate 4 slides between the left abutment plate 5 and the right abutment plate 6. The gate plate 4 moves downward until its flow hole 401 is completely located between the left abutment plate 5 and the right abutment plate 6. At this time, the gate plate 4 is located above the flow hole 401 in the flow channel 1011. At this time, the gate plate 4 completely blocks the flow channel 1011, and the medium in the flow channel 1011 no longer flows.

[0039] During the downward movement of the gate plate 4, a part of the flow hole 401 of the gate plate 4 is located between the left abutment plate 5 and the right abutment plate 6, and the other part is still in the flow channel 1011. At this time, since the flow channel 1011 still continues to flow with medium, the medium will continue to flow through the flow hole 401 on the gate plate 4 that is still in the flow channel 1011. A part of the medium passes through the gate plate 4, and the other part accumulates in the flow hole 401 located between the left abutment plate 5 and the right abutment plate 6. As the gate plate 4 continues to descend, the flow hole 401 of the gate plate 4 When it is completely between the left abutment plate 5 and the right abutment plate 6, it will be filled with medium. At this time, the medium in the flow hole 401 of the gate plate 4 is fixed in the flow hole 401 by the plate walls of the gate plate 4 around the flow hole 401 and the left abutment plate 5 and the right abutment plate 6. When the flow channel 1011 needs to return to the flow state, the gate plate 4 rises, and the medium accumulated in the flow hole 401 of the gate plate 4 re-enters the flow channel 1011 and flows away. When the valve body is set in a medium pipeline containing a lot of sand, particles, and slag, a combined plate type double-sealed slag isolation valve with left and right abutment plates is used. Due to the isolation and coordination of the four sides of the combined plates, the medium in the gate flow hole is sealed between the combined plates (gate plate, left abutment plate, right abutment plate) during the opening and closing process, and will not enter the valve body cavity. The gate plate can be opened and closed freely up and down to work effectively, thereby ensuring the sealing performance of the valve.

[0040] The lower valve body 103 of the valve body 1 is fixed to the bottom cover 3 by bolts, and is stably fixed by bolts 15 and nuts, and can be disassembled. Through this split valve body (valve body, bottom cover combination) structure, when the valve is maintained after many years of use, there is no need to dismantle the pipeline of the entire valve, but only need to remove the bottom cover parts in the valve, and the entire inner cavity and parts of the valve can be cleaned, drained, and maintained, which greatly reduces the engineering maintenance time and labor costs.

[0041] A sealing gasket 13 is provided on the contact surface between the lower valve body 103 and the bottom cover 3 to form a seal between the lower valve body 103 and the bottom cover 3, thereby protecting the internal components of the abutment plate cavity 301.

[0042] A scraper ring 12 is provided on the lower side of the left abutment plate 5 and the right abutment plate 6. When the flow hole 401 of the gate plate 4 is completely located between the left abutment plate 5 and the right abutment plate 6, the scraper ring 12 is located on the lower side of the flow hole 401 to prevent the accumulated medium in the flow channel hole 401 from leaking out. It can also prevent the medium adhering to the surface of the gate plate 4 from leaking out. The hanging ring 12 can scrape the medium on the surface of the gate plate 4 and squeeze it into the flow hole 401.

[0043] A sealing ring 8 is provided in the valve seat 7, and the sealing ring 8 is arranged around the gate plate 4, so that when the gate plate 4 moves up and down, the flow channel 1011 in the valve body 1 can be sealed to prevent the medium in the flow channel 1011 from leaking out of the main valve body 1 when the gate plate 4 moves up and down. The sealing ring 8 is preferably made of plastic.

[0044] A hard sealing coating 10 is provided inside the valve seat 7 and on the inner side of the sealing ring 8. Long-term use of the gate 4 will inevitably continuously wear the sealing ring 8. After the sealing ring 8 is worn out, the hard sealing coating 10 takes over the work of the sealing ring 8 to achieve sealing. The valve seat 7 has a dual sealing function, with a sealing ring as the first seal, and the hard sealing coating is not used for the second seal. When the first seal of the sealing ring (plastic) is worn out, the second seal of the hard sealing coating immediately fits and takes over the seal, which greatly improves the service life of the valve.

[0045] A valve stem member is fixed to the upper valve body 102 by means of bolts, and a valve stem 16 is slidably provided inside the valve stem member. The valve stem 16 is fixedly connected to the gate plate, and a clamping block is provided between the upper valve body 102 and the connecting groove located on the upper side. The clamping block is used to clamp the gate plate 4 to keep it vertical. The clamping block is cooperated with the valve seat 7 installed in the connecting groove, and an O-ring 9 is provided between the clamping block and the valve seat 7. The O-ring is used to lock the relative position between the clamping block and the valve seat 7.

[0046] A pneumatic actuator 17 is fixedly connected to the upper side of the valve stem by bolts. The pneumatic actuator 17 is connected to the valve stem 16. The user controls the pneumatic actuator 17 to drive the gate plate 4 to slide up and down. The pneumatic actuator 17 drives the valve stem 16 to further drive the gate plate 4 to move.

[0047] The left and right abutment plates 5 and 6 are fixed with limit blocks 18 on their bottom sides. The limit blocks 18 are preferably fixed to the inside of the bottom cover 3 by screws 19. The limit blocks 18 are arranged to correspond to the shape of the bottom sides of the gate plate 4. The limit blocks 18 can accurately control the closing position of the gate plate to prevent the valve from being too closed and affecting the sealing.

[0048] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A combined plate type double sealing slag isolation valve, characterized in that: It includes a valve body, and an upper valve cover and a bottom cover installed on the upper side of the valve body. The valve body is composed of a main valve body, an upper valve body and a lower valve body. A valve seat is arranged in the main valve body, a gate plate is slidably arranged in the valve seat, and a flow hole is arranged on the gate plate. The bottom cover and the lower valve body are combined into a shell with a backing plate cavity, and a left backing plate and a right backing plate are symmetrically arranged in the backing plate cavity, and the gate plate slides between the left backing plate and the right backing plate.

2. A combined plate type double sealing slag isolation valve according to claim 1, characterized in that: Both ends of the gate plate extend out of the valve seat.

3. The combined plate type double sealing slag isolation valve according to claim 1, characterized in that: A cylindrical coil spring is provided between the left abutment plate, the right abutment plate and the lower valve body.

4. The combined plate type double sealing slag isolation valve according to claim 1, characterized in that: A sealing ring is arranged in the valve seat surrounding the gate plate, and a hard sealing coating is arranged in the sealing ring of the valve seat.

5. The combined plate type double sealing slag isolation valve according to claim 1, characterized in that: Scraping rings are arranged on the lower sides of the left abutment plate and the right abutment plate.

6. The combined plate type double sealing slag isolation valve according to claim 1, characterized in that: The valve stem is connected to the upper side of the gate plate.

7. A combined plate type double sealing slag isolation valve according to claim 6, characterized in that: A clamping block cooperating with the valve seat is disposed in the upper valve body, the clamping block clamps the valve stem, and an O-ring is disposed between the clamping block and the valve seat.

8. The combined plate type double sealing slag isolation valve according to claim 1, characterized in that: The upper valve body is provided with a valve stem member, and the valve stem slides inside the valve stem member.

9. A combined plate type double sealing slag isolation valve according to claim 8, characterized in that: A pneumatic actuator is arranged on the upper side of the valve stem, and the pneumatic actuator is connected to the valve stem.

10. The combined plate type double sealing slag isolation valve according to claim 1, characterized in that: A limit block is arranged inside the bottom cover, and the limit block is arranged corresponding to the gate plate.

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