Novel plug valve

Abstract

The utility model provides a novel plug valve, and relates to the technical field of valves. Comprising a valve seat made of PEEK or stainless steel materials, and a cock is arranged in the valve seat. A lining is fixedly nested in the valve seat; the lining is located on the periphery of the rotary plug. A 2507 stainless steel sealing cover is arranged at the upper end of the valve seat; the upper end of the valve rod penetrates through the sealing cover, the middle of the valve rod is in sealing connection with the sealing cover, and the lower end of the valve rod is connected with the cock; and the sealing surface of the sealing cover is made of stellite alloy steel. A cavity is eliminated through the lining, crystal accumulation is avoided, two-way sealing supports any flow direction, materials are resistant to corrosion and high temperature, the problem of urea crystal accumulation in the ammonium carbamate solution environment is avoided, and normal operation of the valve is guaranteed.

Description

A new type of plug valve Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a novel plug valve. Background Technology

[0002] A plug valve is a 1 / 4-turn valve that uses a cylindrical or conical plug to allow a straight flow of fluid through the valve body. The plug has a straight-through opening. As a fully open design, this opening area is the same as the valve's inlet and outlet areas. The valve core can be designed with a wide variety of flow areas, shapes, and functional flow inlets and outlets. Commonly used opening designs allow for a small force drop even at maximum flow area. The shape of the valve core can also impart throttling characteristics. In throttling conditions, the valve core is in the intermediate position, and the fluid experiences two pressure drops at the valve core.

[0003] Existing plug valves suffer from several problems, particularly in chemical applications such as ammonium carbamate solutions, where they are susceptible to corrosion, posing a significant challenge to their corrosion resistance. Furthermore, these applications require excellent sealing performance. Therefore, this invention proposes a novel plug valve to at least partially address the problems inherent in the prior art. Summary of the Invention

[0004] To overcome or at least partially solve the above problems, this utility model provides a novel plug valve.

[0005] The embodiments of this utility model are implemented as follows:

[0006] This application provides a novel plug valve, comprising:

[0007] The valve seat is made of PEEK or stainless steel and contains a stopcock.

[0008] A bushing is fixedly nested inside the valve seat; the bushing is located on the outer periphery of the plug.

[0009] The upper end of the valve seat is provided with a 2507 stainless steel cap;

[0010] The valve stem has its upper end penetrating the cover, its middle part sealingly connected to the cover, and its lower end connected to the plug.

[0011] The sealing surface of the cap is made of Stellite alloy steel.

[0012] In some embodiments of this utility model, the upper end of the valve stem is provided with a handle.

[0013] In some embodiments of this utility model, the cover is further provided with an adjusting screw;

[0014] The valve seat is provided with a sealing element that is fitted onto the valve stem at the connection point between the valve seat and the cover, and at the connection point between the valve stem and the plug.

[0015] The upper end of the seal is connected to the adjusting screw.

[0016] In some embodiments of this utility model, two or more sealing rings are provided at the position where the valve stem connects to the cover.

[0017] In some embodiments of this utility model, a stop bar is provided at the channel opening of the valve seat, and the opening of the bushing is engaged at the stop bar position.

[0018] In some embodiments of this utility model, the bushing is made of PEEK, PTFE, PHB, PPL, or RTFE material.

[0019] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0020] The valve seat, made of PEEK or stainless steel, contains a stopcock. A bushing is fixedly nested within the valve seat, located around the stopcock. A 2507 stainless steel cap is located at the upper end of the valve seat. The valve stem passes through the cap at its upper end, with its middle section sealingly connected to the cap, and its lower end connected to the stopcock. The sealing surface of the cap is made of Stellite alloy steel. The bushing eliminates cavities, preventing crystal buildup. The bidirectional seal supports flow in any direction. The material's corrosion resistance and high-temperature resistance prevent urea crystal buildup in ammonium carbamate solution environments, ensuring normal valve operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a partial cross-sectional view of a novel plug valve provided in one embodiment of the present invention;

[0023] Figure 2 is a cross-sectional structural diagram of a novel plug valve provided in one embodiment of the present invention;

[0024] Figure 3 is an enlarged view of part A in Figure 2;

[0025] Figure 4 is a schematic diagram of the internal structure of the valve seat of a novel plug valve provided in one embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the various embodiments and features described below can be combined with each other.

[0028] Referring to Figures 1 to 4, this embodiment of the present invention provides a novel plug valve, comprising: a valve seat 1 made of PEEK or stainless steel, with a plug 2 disposed therein; a bushing 3 fixedly nested inside the valve seat 1; the bushing 3 being located on the outer periphery of the plug 2; a 2507 stainless steel cap 4 at the upper end of the valve seat 1; a valve stem 5, the upper end of which passes through the cap 4, the middle part of which is sealed to the cap 4, and the lower end of which is connected to the plug 2; the sealing surface of the cap 4 is made of Stellite alloy steel. The bushing 3 ensures that there is almost no cavity inside the valve seat 1, thereby eliminating residual space for the medium and avoiding the problem of urea crystallization accumulation in ammonium carbamate solution environments. The sealing connection between the cap 4 and the valve seat 1, and the sealing connection between the plug 2 and the valve seat 1, forms a bidirectional sealing structure, supporting installation in any flow direction and simplifying pipeline layout. The 2507 corrosion-resistant stainless steel and Stellite alloy steel sealing surfaces have a temperature resistance of up to 280℃. In this application, the covering bushing 3 provides surface sealing characteristics and good sealing performance; online sealing compensation improves service life; there is no gap in the valve body cavity and no medium residue; during the rotation of the plug 2, the inner wall of the bushing is automatically wiped; it is designed as a multi-channel structure, a three-way or four-way structure.

[0029] The valve seat 1 is made of PEEK or stainless steel, the cover is made of 2507 stainless steel, and the sealing surface is made of Stellite alloy steel. These materials all possess excellent corrosion resistance, effectively coping with highly corrosive environments such as ammonium carbamate solutions, thus extending the valve's service life. Through the sealing connection between the cover 4 and the valve seat 1, and the sealing connection between the plug 2 and the valve seat 1, a bidirectional sealing structure is formed, supporting installation in any flow direction, simplifying pipeline layout, and ensuring good sealing performance to prevent media leakage. The bushing 3 ensures that there is almost no cavity inside the valve seat 1, eliminating residual media space and avoiding the problem of urea crystal accumulation in ammonium carbamate solution environments, ensuring the normal operation of the valve. It can also be designed as a multi-channel structure (three-way or four-way) to meet different fluid control needs and improve the valve's applicability.

[0030] Furthermore, the valve seat 1 is made of PEEK material, and the bushing 3 is also made of PEEK material. They are fixedly nested within the valve seat via an interference fit to ensure a tight connection. The cover 4 is made of 2507 stainless steel and is bolted to the upper end of the valve seat. The sealing surface is made of Stellite alloy steel welded together. The plug valve 2 is threaded to the valve stem 5. The upper end of the valve stem 5 passes through the cover, and the middle part is sealed to the cover 4 via a stuffing box. In practical applications, this plug valve can be used to control ammonium carbamate solution in chemical pipelines, achieving bidirectional sealing and installation in any flow direction.

[0031] It should be noted that 2507 stainless steel is a ferritic-austenitic (duplex) stainless steel, combining the most beneficial properties of many ferritic and austenitic steels. Due to its high chromium and molybdenum content, it exhibits excellent resistance to pitting corrosion, crevice corrosion, and uniform corrosion. The duplex microstructure ensures high resistance to stress corrosion cracking, and it also possesses high mechanical strength.

[0032] In some embodiments of this utility model, a handle 8 is provided at the upper end of the valve stem 5. The handle 8 at the upper end of the valve stem 5 facilitates manual operation of the valve opening and closing by the operator, eliminating the need for other tools and improving operational efficiency. The handle 8 has a cylindrical structure and is fixed to the upper end of the valve stem by a key connection. The surface of the handle has anti-slip textures for easy gripping. The handle can be detachable, facilitating installation and maintenance in space-constrained environments.

[0033] Furthermore, the cover 4 is also provided with an adjusting screw 7; the valve seat 1 is also provided with a sealing element 6 sleeved on the valve stem 5 at the connection position with the cover 4 and at the connection position between the valve stem 5 and the stopcock 2; the upper end of the sealing element 6 is connected to the adjusting screw 7. The sealing element 6 is located between the top of the stopcock and the valve stem to enhance the sealing performance.

[0034] The aforementioned sealing element 6 is located inside the valve seat 1 at the connection point with the cover 4 and at the connection point between the valve stem 5 and the plug 2, effectively preventing media leakage from these locations. The adjusting screw 7 is connected to the sealing element 6, which can apply a pre-tightening force to the sealing element, achieving online sealing compensation. As the sealing element wears during use, the sealing force can be adjusted in a timely manner by adjusting the screw, thereby improving the service life of the valve.

[0035] For example, the aforementioned sealing element 6 can be an O-ring, fitted onto the valve stem 5, located between the top of the stopcock 2 and the valve stem 5. The adjusting screw 7 is mounted on the cover 4, connected to the cover 4 via threads, with its lower end contacting the sealing element 6. When the sealing force needs adjustment, the adjusting screw is rotated to press the sealing element downwards, increasing the friction between the sealing element 6 and the valve stem 5 and valve seat 1, thereby improving the sealing performance.

[0036] In some embodiments of this utility model, two or more sealing rings 51 are provided at the connection position between the valve stem 5 and the cover 4. The provision of two or more sealing rings 51 at the connection position between the valve stem 5 and the cover 4 forms a multi-seal structure, further improving the sealing performance of this part and effectively preventing media leakage from the valve stem 5.

[0037] Two O-rings are installed at the connection between the valve stem 5 and the cover 4, with a certain gap between the two O-rings to form a sealing cavity. The sealing ring 51 is installed in the annular groove of the valve stem 5 and fits tightly with the inner hole of the cover 4 to ensure that the medium cannot leak from this part.

[0038] Furthermore, a stop bar 11 is provided at the channel opening of the valve seat 1, and the opening of the bushing 3 is engaged with the stop bar 11. This is used to fix the bushing 3, prevent the bushing from being driven by the rotating plug 2, and keep the bushing 3 in contact with the valve seat 1.

[0039] A stop bar is provided at the channel opening of the valve seat 1, and the opening of the bushing 3 is locked at the stop bar position. This can effectively prevent the bushing 3 from being driven when the plug 2 rotates, so that the bushing 3 remains in contact with the valve seat 1, ensuring the stability and sealing effect of the bushing 3.

[0040] Specifically, for example, the aforementioned baffle 11 adopts an annular protrusion structure and is set inside the channel opening of the valve seat 1, while the opening of the bushing 3 is provided with an annular groove that mates with the baffle 11. When the bushing 3 is installed inside the valve seat 1, the groove engages with the baffle, thereby fixing the position of the bushing. When the plug 2 rotates, due to the restriction of the baffle, the bushing will not rotate with the plug, maintaining relative stillness with the valve seat.

[0041] In some embodiments of this utility model, the bushing 3 is made of PEEK, PTFE, PHB, PPL, or RTFE material. The bushing 3 can be made of one of these materials, such as PEEK, PTFE, PHB, PPL, or RTFE. The appropriate material can be selected based on the specific application environment and working conditions to improve the bushing's corrosion resistance, wear resistance, and high-temperature resistance. Specifically, in high-temperature environments, a bushing 3 made of RTFE material can be selected, as RTFE has excellent high-temperature resistance and corrosion resistance, and can operate stably at temperatures up to 280°C. In highly corrosive environments, a bushing 3 made of PTFE material is selected, as PTFE has excellent corrosion resistance to most chemicals and solvents.

[0042] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Although optional embodiments of this utility model have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including optional embodiments as well as all changes and modifications falling within the scope of this utility model.

[0043] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0044] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A novel plug valve, characterized in that, include: A valve seat (1) made of PEEK or stainless steel is provided with a plug (2) inside; a bushing (3) is fixedly nested inside the valve seat (1); the bushing (3) is located on the outer periphery of the plug (2); a 2507 stainless steel cap (4) is provided at the upper end of the valve seat (1); a valve stem (5) is provided with its upper end penetrating the cap (4), its middle part being sealed to the cap (4), and its lower end being connected to the plug (2); the sealing surface of the cap (4) is made of Stellite alloy steel.

2. The novel plug valve according to claim 1, characterized in that, The valve stem (5) is provided with a handle (8) at its upper end.

3. The novel plug valve according to claim 1 or 2, characterized in that, The cover (4) is also provided with an adjusting screw (7); the valve seat (1) is also provided with a sealing element (6) sleeved on the valve stem (5) at the connection position with the cover (4) and at the connection position between the valve stem (5) and the stopcock (2); the upper end of the sealing element (6) is connected to the adjusting screw (7).

4. The novel plug valve according to claim 1, characterized in that, Two or more sealing rings (51) are provided at the position where the valve stem (5) connects to the cover (4).

5. The novel plug valve according to claim 4, characterized in that, The valve seat (1) is also provided with a baffle (11) at the channel opening position, and the opening of the bushing (3) is engaged at the baffle (11) position.

6. The novel plug valve according to claim 1, characterized in that, The bushing is made of PEEK, PTFE, PHB, PPL, or RTFE material.

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