Valve clack and valve rod assembly of high-temperature stop valve

Abstract

A valve clack and valve rod assembly of a high-temperature stop valve relates to the field of stop valves, a cylindrical hole is formed in a valve clack, the hole is connected with a valve rod through a split ring, an orifice of the hole is pressed and fixed through a threaded pressing sleeve, and long pin pieces are arranged at the joints of the valve clack, the valve rod and the threaded pressing sleeve. The long pin piece is used for connecting and fixing the valve clack, the valve rod and the threaded pressing sleeve and bearing the shear stress of the valve rod and the valve clack, and the short pin piece is arranged at the joint of the valve rod and the threaded pressing sleeve and used for connecting and fixing the threaded pressing sleeve and the valve rod and bearing the shear stress of the valve rod. By means of the connecting structure of the long pin and the short pin, the connecting structure problem of the valve clack and the valve rod made of different materials is reasonably solved, and the stop valve can work better in the ultra-high-temperature environment.

Description

Technical Field

[0001] The utility model relates to the field of globe valves, in particular to a valve disc and valve stem assembly of a high-temperature globe valve. Background Art

[0002] A high-temperature globe valve refers to a valve in which the valve disc moves along the center line of the valve seat and is used for cutting-off and throttling operations in a high-temperature environment. Since the opening or closing stroke of the valve stem of this type of valve is relatively short and it has a very reliable cutting function, and the change of the valve seat port is proportional to the stroke of the valve disc, it is very suitable for flow regulation.

[0003] In an ultra-high temperature working environment, the valve stem and valve disc of the globe valve will directly contact the ultra-high temperature medium. If the entire globe valve is made of materials resistant to ultra-high temperature, it is difficult to meet the actual production requirements in terms of the strength, stiffness and cost of the product. At the same time, due to the different processing technologies and actual functions of the valve disc and valve stem, different materials need to be selected for the two, and the airtightness between the valve disc body and the valve stem connected by welding will be affected in an ultra-high temperature environment. Therefore, a valve disc and valve stem assembly with both high airtightness and high connection performance is required. Content of the Utility Model

[0004] The utility model adopts a connection structure including a threaded compression sleeve and pin fixing, which solves the connection and airtightness problems of the valve stem and valve disc in a high-temperature environment.

[0005] The technical solution specifically adopted by the utility model is as follows:

[0006] A valve disc and valve stem assembly of a high-temperature globe valve, a cylindrical hole is provided in the valve disc, the hole is connected to the valve stem through a split ring, the orifice of the hole is tightly fixed by a threaded compression sleeve, and a long pin is provided at the connection of the valve disc, valve stem and threaded compression sleeve. The long pin is used to connect and fix the valve disc, valve stem and threaded compression sleeve and bear the shear stress of the valve stem and valve disc. A short pin is provided at the connection of the valve stem and the threaded compression sleeve. The short pin is used to connect and fix the threaded compression sleeve and the valve stem and bear the shear stress of the valve stem.

[0007] Six long pins are provided in total, and the long pins are evenly distributed in a circumferential manner at the connection of the valve disc, valve stem and threaded compression sleeve. Four short pins are provided in total, and the short pins are evenly distributed in a circumferential manner at the connection of the threaded compression sleeve and the valve stem.

[0008] A guide surface for inserting into the valve seat of the globe valve and a spherical sealing surface for cooperating with the valve seat are provided at the lower end of the valve disc, and an annular inner groove is provided between the guide surface and the spherical sealing surface.

[0009] The hole inside the valve disc is connected to the lower end of the valve stem by interference fit.

[0010] A cooling pipe for cooling is provided at the upper end inside the valve stem. The cooling pipe is provided with an inlet water flow channel and an outlet water flow channel. A cooling water inlet and a cooling water outlet are formed on the outer side of the valve stem. The cooling water inlet is communicated with the inlet water flow channel, and the cooling water outlet is communicated with the outlet water flow channel.

[0011] A connecting thread is provided at the connection between the valve flap and the threaded compression sleeve, and the connecting thread is used to reinforce the position of the threaded compression sleeve.

[0012] The material of the valve flap is selected as TaW10 alloy, and the material of the valve stem is selected as high-temperature alloy steel GH3128.

[0013] The exposed surfaces of the connecting parts of the valve stem and the threaded compression sleeve outside the valve flap are sprayed with a high-temperature resistant material made of tantalum tungsten alloy.

[0014] The beneficial effect of the utility model is that through the setting of the connection structure of the long pin and the short pin, the connection structure problem between the valve flap and the valve stem of different materials is reasonably solved, so that the globe valve can work better in an ultra-high temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a sectional structure diagram of a valve flap and valve stem assembly of a high-temperature globe valve.

[0016] In the figure: 1, valve flap; 11, guiding surface; 12, spherical sealing surface; 13, hole; 14, connecting thread; 15, annular inner groove; 2, valve stem; 21, cylindrical mating surface; 22, cooling water inlet; 23, cooling water outlet; 3, split ring; 4, long pin part; 5, threaded compression sleeve; 6, short pin part; 7, cooling pipe; 71, inlet water flow channel; 72, outlet water flow channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be described below with reference to the accompanying drawings.

[0018] As Figure 1, A valve disc and valve stem assembly of a high-temperature globe valve, the structure of which includes a valve disc 1 and a valve stem 2. A cylindrical hole 13 is provided inside the valve disc 1, and the hole 13 is connected to the valve stem 2 through a split ring 3. The split ring 3 is also used to bear the axial force from the valve stem 2 when assisting in connecting the valve stem 2 and the valve disc 1. The orifice of the hole 13 is tightly fixed by a threaded bushing 5. A long pin 4 is provided at the connection of the valve disc 1, the valve stem 2 and the threaded bushing 5. The long pin 4 is used to strengthen the connection and fixation relationship among the three and bear the shear stress from the valve stem 2 and the valve disc 1 when the globe valve is working. A short pin 6 is provided at the connection of the valve stem 2 and the threaded bushing. The short pin is used to fix the upper half of the threaded bushing 5 exposed outside the valve disc 1 and share the shear stress from the valve stem 2 when the globe valve is working. As a preference of the present invention, there are six long pins 4 in total, which are evenly distributed in a circle at the connection of the valve disc 1, the valve stem 2 and the threaded bushing 5, and there are four short pins 6 in total, which are evenly distributed in a circle at the connection of the threaded bushing 5 and the valve stem 2.

[0019] A guiding surface 11 for inserting into the valve seat of the globe valve and a spherical sealing surface 12 for cooperating with the valve seat of the globe valve are provided at the lower end of the valve disc 1. An annular inner groove 15 is provided between the guiding surface 11 and the spherical sealing surface 12. The shape of the guiding surface 11 fits the fixed opening of the valve seat, preventing the liquid from flowing during the throttling of the globe valve. The spherical sealing surface 12 is used to isolate the internal space of the valve disc 1 from the external high-temperature environment, enabling the valve stem 2 to heat up more slowly and cool down faster during operation, extending the service life of the valve disc 1. The annular groove 15 plays an air insulation effect, which can appropriately reduce the thermal radiation received by the spherical sealing surface 12 when the valve is closed.

[0020] The cylindrical hole 13 inside the valve disc 1 and the cylindrical mating surface 21 at the lower end of the valve stem 2 are connected in an interference fit manner, that is, there is a gap between the bottom of the cylindrical mating surface 21 of the valve stem 2 and the bottom surface of the cylindrical hole 13. During the production and processing process, the valve disc 1 is sleeved on the cylindrical mating surface 21 of the valve stem after being heated red, thus completing the interference fit connection between the valve disc 1 and the valve stem 2. This processing method enables the valve disc 1 to withstand the axial tensile and compressive stresses from the valve stem 2, thereby improving the bonding strength between the valve disc 1 and the valve stem 2.

[0021] At the upper end inside the valve stem 2, there is a cooling pipe 7 for cooling. The cooling pipe 7 is provided with a water inlet channel 71 and a water outlet channel 72. On the outer side of the valve stem 2, there are a cooling water inlet 22 and a cooling water outlet 23. The cooling water inlet 22 is communicated with the water inlet channel 71, and the cooling water outlet 23 is communicated with the water outlet channel 72. When the globe valve works, the cooling water flows into the water inlet channel 71 from the cooling water inlet 22, passes through the whole cooling pipe 7 until the water outlet channel 72, and when the cooling water overflows to the cooling water outlet 23, the cooling water starts to be discharged. The whole cooling process ensures that most areas of the valve stem 2 can be cooled down, enhancing the heat resistance of the valve stem 2.

[0022] At the connection part between the valve flap 1 and the threaded bushing 5, a connecting thread 14 is milled, and the connecting thread 14 is used to reinforce the position of the threaded bushing 5.

[0023] The material of the valve flap is selected as TaW10 alloy, and the material of the valve stem is selected as high-temperature alloy steel GH3128. Both are high-temperature resistant alloy materials. TaW10 has stronger plasticity and toughness and is more suitable for making the valve flap 1, while GH3128 has stronger rigidity and is more suitable for making the valve stem 2.

[0024] The exposed surface of the connecting part of the valve stem 2 and the threaded bushing 5 outside the valve flap 1 is sprayed with a high-temperature resistant material made of tantalum tungsten alloy to prevent the connecting part from being damaged by high temperature in an ultra-high temperature environment, thus affecting the service life of the globe valve.

[0025] The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. used in the above description is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0026] The above content describes the structure, main embodiments and advantages of the present invention. It should be noted that the specific implementation of the present invention is not limited by the above methods. As long as various non-substantial improvements are made by adopting the technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention. The protection scope required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve disc and valve stem assembly of a high-temperature stop valve, characterized in that: A cylindrical hole (13) is provided inside the valve disc (1). The hole (13) is connected to the valve stem (2) through a split ring (3). The orifice of the hole (13) is tightly fixed by a threaded bushing (5). A long pin (4) is provided at the connection of the valve disc (1), the valve stem (2) and the threaded bushing (5). The long pin (4) is used to connect and fix the valve disc (1), the valve stem (2) and the threaded bushing (5) and bear the shear stress of the valve stem (2) and the valve disc (1). A short pin (6) is provided at the connection of the valve stem (2) and the threaded bushing (5). The short pin (6) is used to connect and fix the threaded bushing (5) and the valve stem (2) and bear the shear stress of the valve stem (2).

2. The valve disc and valve stem assembly of a high-temperature stop valve according to claim 1, characterized in that: Six long pins (4) are provided in total. The long pins (4) are evenly distributed in a circumferential manner at the connection of the valve disc (1), the valve stem (2) and the threaded bushing (5). Four short pins (6) are provided in total. The short pins (6) are evenly distributed in a circumferential manner at the connection of the threaded bushing (5) and the valve stem (2).

3. The valve disc and valve stem assembly of a high-temperature stop valve according to claim 1, characterized in that: A guiding surface (11) for inserting into the seat of a globe valve and a spherical sealing surface (12) for cooperating with the seat are provided at the lower end of the valve disc (1). An annular inner groove (15) is provided between the guiding surface (11) and the spherical sealing surface (12).

4. The valve disc and valve stem assembly of a high-temperature stop valve according to claim 1, characterized in that: The hole (13) inside the valve disc (1) is connected to the lower end of the valve stem (2) by interference fit.

5. The valve flap and valve stem assembly of a high-temperature stop valve according to claim 1, characterized in that: A cooling pipe (7) for cooling is provided at the upper end inside the valve stem (2). The cooling pipe (7) is provided with a water inlet passage (71) and a water outlet passage (72). A cooling water inlet (22) and a cooling water outlet (23) are opened on the outer side of the valve stem (2). The cooling water inlet (22) is communicated with the water inlet passage (71), and the cooling water outlet (23) is communicated with the water outlet passage (72).

6. The valve disc and valve stem assembly of a high-temperature stop valve according to claim 1, characterized in that: A connecting thread (14) is provided at the connection of the valve disc (1) and the threaded bushing (5). The connecting thread (14) is used to reinforce the position of the threaded bushing (5).

7. The valve flap and valve stem assembly of a high-temperature stop valve according to claim 1, characterized in that: The material of the valve disc (1) is selected as TaW10 alloy, and the material of the valve stem (2) is selected as high-temperature alloy steel GH3128.

8. The valve disc and valve stem assembly of a high-temperature stop valve according to claim 1, characterized in that: The exposed surfaces of the connecting parts of the valve stem (2) and the threaded bushing (5) outside the valve disc (1) are sprayed with a high-temperature-resistant material made of tantalum tungsten alloy.

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