Temperature and pressure reducing valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a temperature and pressure reducing valve. Comprising a valve body, a valve clack and a valve rod, a medium inlet and a medium outlet are formed in the two ends of the valve body, and a medium flow channel is formed between the medium inlet and the medium outlet; a valve seat is arranged in the valve body and divides the medium flow channel into an inner flow channel section and an outer flow channel section. The upper wall face and the lower wall face of the valve seat are each provided with a pressure reduction channel, and the pressure reduction channels communicate with the inner flow channel section and the outer flow channel section. One end of the valve rod is connected with an executing mechanism, and the executing mechanism is used for driving the valve rod to rotate; the other end of the valve rod extends into the valve body from the upper end of the valve body and is coaxially connected with the valve clack; according to the pressure reducing valve, when the valve rod is opened, pressure reducing and temperature reducing can be synchronously achieved in the pressure reducing channel, adjustment is flexible, opening of the valve rod can be boosted through connection of temperature reducing water, the operation flexibility is improved, and practicability is high.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a de-temperature and pressure reducing valve. Background Technology

[0002] Modern industrial parks are designed with industrial gas pipelines in mind to recover and utilize the high-temperature, high-pressure steam generated by boilers in large power plants and chemical plants. This aims to achieve energy conservation, environmental protection, improved production efficiency, and reduced production costs. However, after the industrial gas pipelines are established, different process equipment requires different steam temperatures and pressures. Furthermore, to ensure high-saturation delivery, the temperature and pressure generated by boilers often far exceed the requirements of some process equipment, necessitating desuperheating and pressure reduction valves before normal operation. When steam flows through these valves, they impede steam flow, reducing impact force, and the introduction of desuperheating water further cools the steam, achieving pressure buffering and temperature reduction for the high-temperature, high-pressure steam.

[0003] The currently used steam desuperheating and pressure reducing valves have the following main defects: During valve opening, the pressure difference between the upper and lower parts of the valve disc prevents pressure balance, requiring significant pulling force from the valve stem to move the disc, thus shortening its lifespan; the steam delivery pressure regulation and the desuperheating water desuperheating regulation are performed separately, resulting in complex and inflexible adjustment methods, which can easily lead to safety hazards in downstream equipment. Further improvements are necessary. Utility Model Content

[0004] The purpose of this utility model is to provide a desuperheating and pressure reducing valve to solve the problems in the prior art where the desuperheating and pressure reducing valve is easily affected by the pressure difference of steam, making it inconvenient to open the valve stem, and the desuperheating and pressure reducing are carried out separately, resulting in inflexible valve adjustment and potential safety hazards.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A desuperheating and pressure-reducing valve includes a valve body, a valve disc, and a valve stem. The valve body has a medium inlet and a medium outlet at both ends, forming a medium flow channel between the medium inlet and the medium outlet. A valve seat is disposed within the valve body, dividing the medium flow channel into an inner flow channel section and an outer flow channel section. Pressure-reducing channels are formed on both the upper and lower walls of the valve seat, connecting the inner and outer flow channel sections. An actuator is connected to one end of the valve stem, driving the valve stem to rotate. The other end of the valve stem is connected to the valve disc. The upper end of the valve body extends into the interior of the valve body and is coaxially connected to the valve disc. The valve disc passes through the pressure reducing channel and extends to the lower end of the valve body. The outer circumferential surface of the valve disc is provided with an outward protrusion that mates with the pressure reducing channel. A water passage is provided inside the valve disc along its length. The valve disc has a desuperheating water spray hole that passes through the outward protrusion. The desuperheating water spray hole is obliquely opened from the inner flow channel section to the outer flow channel section. A desuperheating water inlet is provided at the lower end of the valve body. The desuperheating water inlet, the water passage, and the desuperheating water spray hole are connected in sequence.

[0007] In this application, when the desuperheating and pressure reducing valve is in operation, if the outer protrusion of the valve disc does not block the pressure reducing channel, the medium first enters the inner flow channel section from the medium inlet, passes through the pressure reducing channel on the upper and lower walls of the valve seat to enter the outer flow channel section, and then flows from the outer flow channel section to the medium outlet. The valve stem can be driven to rotate by the actuator. The rotation of the valve stem can raise or lower the valve disc. When the valve disc is raised, the gap between the outer protrusion of the valve disc and the pressure reducing channel will increase. When the valve disc is lowered, the gap between the outer protrusion and the pressure reducing channel will decrease, or even become zero, that is, the outer protrusion contacts the inner wall of the pressure reducing channel, thus blocking the pressure reducing channel. As the medium passes through the pressure-reducing channel, the desuperheating water, which is fed into the water passage through the desuperheating water inlet, can be sprayed out from the desuperheating water spray holes on the upper and lower sections to cool the medium. Furthermore, the desuperheating water spray holes are angled, allowing the desuperheating water to cool in the direction of the medium's flow through the pressure-reducing channel. The desuperheating water and the medium can fully contact and evaporate in the pressure-reducing channel, resulting in high flexibility in adjusting the pressure and temperature reduction. In addition, by opening the upper and lower channels of the valve seat simultaneously, the pressure difference when the valve disc opens the pressure-reducing channel can be reduced, making it easier to rotate the valve stem, thereby protecting the mechanical properties of the valve stem and extending its service life.

[0008] Furthermore, the actuator can be a manual actuator or an electric actuator; the actuator can drive the valve stem to rotate, reducing the intensity of manual labor.

[0009] Furthermore, the radial cross-section of the pressure-reducing channel is trapezoidal, with the upper base length being greater than the lower base length. This structural design allows for a reduction in the medium's flow velocity and impact on the valve disc when the valve disc opens the pressure-reducing channel, as the cross-sectional area increases from bottom to top. When the valve disc closes the pressure-reducing channel, the contact area between the protruding part and the pressure-reducing channel is larger, resulting in tighter contact and better sealing performance.

[0010] Furthermore, a lower connecting seat is provided at the lower end of the valve body, and a through hole is provided in the middle of the lower connecting seat. A second sealing component is provided in the through hole for sealing the lower end of the valve disc. A lower fixing member for fixing the second sealing component is installed on the end face of the lower connecting seat.

[0011] Furthermore, the lower fixing component includes a lower flange installed on the end face of the lower connecting seat and a butt-welding flange installed at the bottom end of the lower flange; the lower flange and the butt-welding flange are provided with through holes along the center line direction of the valve disc to form the desuperheating water inlet.

[0012] Furthermore, the second sealing assembly includes a guide flange sleeved on the lower end of the valve disc, the outer wall of the guide flange being snapped between the lower connecting seat and the lower flange; and a bushing, a second packing gasket, a second packing, a second packing gland, and a second clamping nut arranged sequentially from top to bottom between the valve disc and the guide flange, the second clamping nut being threadedly connected to the guide flange.

[0013] Furthermore, an upper connecting seat is provided at the upper end of the valve body, and a valve cover is installed at the upper end of the upper connecting seat; a sealing cavity is opened in the middle of the upper end face of the valve cover, and a first sealing component is provided in the sealing cavity for sealing the valve stem.

[0014] Furthermore, the first sealing assembly includes a first packing pad, a first packing, a first spacer ring, and a first packing gland arranged sequentially from bottom to top within the sealing cavity, and the top of the valve cover is provided with a clamping member for pressing the first packing gland.

[0015] The aforementioned first and second sealing components ensure that the medium inside the valve body will not leak during the operation of the valve stem and valve disc.

[0016] Furthermore, throttling sleeves are provided at the upper and lower ends of the valve body near the inner wall of the outer flow channel section, and throttling orifices are arrayed on the outer circumferential surface of the throttling sleeves. The throttling sleeves can more smoothly regulate the pressure difference during the medium flow process and reduce noise during the operation of the desuperheating and pressure-reducing valve.

[0017] The utility model adopting the above technical solution has the following advantages:

[0018] In this application, the medium conveyed through the medium inlet is de-cooled and de-pressurized through the cooperation between the protruding parts on the valve stem and valve disc and the pressure-reducing channel of the valve seat, and then output from the medium outlet. During the passage of the medium through the pressure-reducing channel, de-cooling water supplied to the water passage via the de-cooling water inlet can be ejected from the de-cooling water spray holes on the protruding parts of the upper and lower sections of the valve disc, thus cooling the medium. Furthermore, the de-cooling water spray holes are angled, allowing the de-cooling water to cool in the direction of the medium's flow through the pressure-reducing channel. The de-cooling water and the medium can fully contact and evaporate in the pressure-reducing channel, resulting in high flexibility in de-cooling and pressure-reducing adjustments. In addition, the contact between the protruding parts and the pressure-reducing channel reduces the force required on the valve stem when the valve disc opens the pressure-reducing channel, and the tighter contact when the valve disc closes the pressure-reducing channel improves the valve's sealing performance. Attached Figure Description

[0019] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0020] Figure 1 This is a cross-sectional structural diagram of the de-icing and pressure-reducing valve of this utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the de-icing and pressure-reducing valve of this utility model after removing the electric actuator.

[0022] Figure 3 for Figure 1 A partial cross-sectional view along the central AA direction;

[0023] Figure 4 The theoretical flow characteristic curve of the desuperheating and pressure reducing valve of this utility model;

[0024] The symbols for the main components are explained below:

[0025] 1. First stud; 2. First nut; 3. Weld-on flange; 4. First spiral wound gasket; 5. Second stud; 6. Second nut; 7. Valve body; 8. Round pin; 9. Nameplate; 10. Screw; 11. Valve cover; 12. Third stud; 13. Third nut; 14. Fourth nut; 15. Electric actuator; 16. First packing gland; 17. First spacer ring; 18. First packing; 19. First packing gasket; 20. Valve stem; 21. Sealing gasket; 22. Valve disc; 23. Bushing; 24. Second spacer ring; 25. Second packing; 26. Second packing gland; 27. Second spiral wound gasket; 28. Guide flange; 29. ​​Second clamping nut; 30. Lower flange; 31. First clamping nut; 32. Washer; 33. Bolt; 34. Pin. Detailed Implementation

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. Furthermore, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0027] like Figures 1-3As shown, an embodiment of the present invention provides a desuperheating and pressure-reducing valve, comprising a valve body 7, a valve disc 22, and a valve stem 20. The valve body 7 has a medium inlet B and a medium outlet C at both ends, forming a medium flow channel between the medium inlet B and the medium outlet C. A valve seat is provided inside the valve body 7, dividing the medium flow channel into an inner flow channel section and an outer flow channel section. Pressure-reducing channels are provided on both the upper and lower walls of the valve seat, connecting the inner and outer flow channel sections. One end of the valve stem 20 is connected to an actuator, which employs... The electric actuator 15, model Z(S)KZ-310BC-30-16, has an output shaft thrust of 4.0KN and is used to drive the valve stem 20 to rotate. The other end of the valve stem 20 extends from the upper end of the valve body 7 into the interior of the valve body 7 and is coaxially connected to the valve disc 22. For example, the valve stem 20 is inserted into the top of the valve disc 22 and is fixed by a round pin 8, which can transmit power. A sealing gasket 21 is installed at the connection between the valve stem 20 and the valve disc 22, and the sealing gasket 21 plays a sealing role. Valve disc 22 passes through the pressure-reducing channel and extends to the lower end of valve body 7; the outer circumferential surface of valve disc 22 is provided with an outward protrusion that mates with the pressure-reducing channel; a water passage is provided inside valve disc 22 along its length; valve disc 22 has desuperheating water spray holes E1 and E2 that pass through the outward protrusion, and the desuperheating water spray holes E1 and E2 are obliquely opened from the inner flow channel section to the outer flow channel section; a desuperheating water inlet D is provided at the lower end of valve body 7, and the desuperheating water inlet D can be connected to a desuperheating water conveying pipe; the desuperheating water inlet D, the water passage, and the desuperheating water spray holes E1 and E2 are connected in sequence. In this embodiment, steam is used as an example: when the desuperheating and pressure-reducing valve is running, there is a gap between the outward protrusion and the pressure-reducing channel, and the pressure-reducing channel is not completely blocked; steam enters from the medium inlet B, first passes through the inner flow channel section, then through the gap between the outward protrusion and the pressure-reducing channel, and then flows out from the medium outlet C after passing through the outer flow channel sections above and below the valve seat. In this process, the steam changes its flow direction from the inner flow channel to the outer flow channel, which obstructs the steam flow and reduces the steam pressure. Furthermore, when the steam passes through the pressure reducing channel, the relative cross-sectional area of ​​the pressure reducing channel increases, and the flow velocity decreases. Simultaneously, the desuperheating water entering through the desuperheating water inlet D is ejected from the desuperheating water nozzles E1 and E2 through the water channel, mixing with the steam and evaporating under the heat energy transferred by the steam, thus achieving a desuperheating effect. The flow direction of the steam in the pressure reducing channel is roughly the same as the direction of the desuperheating water ejected from the desuperheating water nozzles, which can ensure the full mixing of steam and desuperheating water, achieving efficient cooperation in desuperheating and pressure reduction, thereby ensuring the stable performance and flexible adjustment of the desuperheating and pressure reducing valve.

[0028] In this embodiment, two pressure-reducing channels are provided, corresponding to two external protrusions. The spacing between the pressure-reducing channels on the valve seat is equal to the spacing between the external protrusions on the valve stem 20. The gap between the external protrusions and the pressure-reducing channels can be adjusted by the valve disc 22 under the action of the valve stem 20. The larger the gap, the smaller the vapor pressure difference between the medium inlet B and the medium outlet C; the smaller the gap, the larger the vapor pressure difference between the medium inlet B and the medium outlet C. Figure 4 The theoretical flow characteristic curve of the desuperheating and pressure-reducing valve of this utility model is shown. It can be seen that the working stroke h = 30 mm and the opening area F = 5.2 cm² are of this desuperheating and pressure-reducing valve. 2 .

[0029] In this embodiment, the desuperheating water spray holes E1 and E2 can be set to three or four as needed; in some simple scenarios, when selecting the actuator, a manual actuator, such as a handwheel, can be selected based on the electric actuator 15.

[0030] In this embodiment, the outer circumferential surface of the valve disc 22 is provided with an outward protrusion that cooperates with the pressure reducing channel. The radial cross-section of the pressure reducing channel is trapezoidal, and the length of the upper base of the trapezoid is greater than the length of the lower base. The cross-section of the outward protrusion is triangular, and when the valve stem 20 rotates and drives the valve disc 22 to descend, the hypotenuse of the triangle can coincide with the hypotenuse of the trapezoid.

[0031] In this embodiment, as Figure 1As shown, an upper connecting seat is provided at the upper end of the valve body 7, and a valve cover 11 is installed at the upper end of the upper connecting seat; the valve cover 11 and the upper connecting seat can be locked and fixed by a bolt and nut assembly. A sealing cavity is opened in the middle of the upper end face of the valve cover 11, and a first sealing component is provided in the sealing cavity for sealing the valve stem 20. A rib is integrally connected to the upper end of the valve cover 11, and a connecting flange is welded to the top of the rib. An electric actuator 15 is installed through the connecting flange; a connecting hole is machined on the connecting flange, and the bottom of the electric actuator is connected and fixed to the connecting flange by a third stud 12 and a third nut 13; the output end of the electric actuator 15 can be connected to a coupling, and a fourth nut 14 is fixedly connected to the bottom of the coupling as a valve stem nut. The fourth nut 14 is threaded to the top of the valve stem 20. Thus, the electric actuator 15 drives the fourth nut 14 to rotate through the coupling, and the rotation of the fourth nut 14 drives the valve stem 20 to rise and fall. A nameplate 9 is installed on the side of the valve cover 11 by screws 10. The first sealing assembly includes, from bottom to top, a first packing pad 19, a first packing 18, a first spacer ring 17, and a first packing gland 16, all arranged sequentially within the sealing cavity. A clamping element for pressing the first packing gland 16 is provided on the top of the valve cover 11. It should be noted that, in actual installation, two or more sets of the first packing pad 18 and the first spacer ring 17 can be arranged alternately. The first sealing assembly seals the valve stem 20 and ensures that the valve stem 20 can rotate to drive the valve disc 22 to regulate and close the flow rate of the pressure-reducing channel.

[0032] like Figure 2 , Figure 3 As shown, the clamping component in this embodiment includes bolts 33 connected to both sides of the sealing cavity by pins 34, and a pressure ring sleeved on the bolts 33. The pressure ring is coaxially fitted with the first packing gland 16 outside the valve stem 20, and the pressure ring is locked by a washer 32 and a first clamping nut 31. The bottom of the pressure ring abuts against the first packing gland 16. The tightness of the first packing 18 is adjusted by adjusting the first clamping nut 31 to ensure the sealing performance of the valve. A lower connecting seat is provided at the lower end of the valve body 7. A through hole is opened in the middle of the lower connecting seat. A second sealing component is provided in the through hole for sealing the lower end of the valve disc 22. A lower fixing component for fixing the second sealing component is installed on the end face of the lower connecting seat. The lower fixing component includes a lower flange 30 installed on the end face of the lower connecting seat and a butt-welded flange 3 installed at the bottom end of the lower flange 30. The lower flange 30 and the butt-welded flange 3 are provided with through holes along the center line of the valve disc 22 to form a desuperheating water inlet D.

[0033] The second sealing assembly includes: a guide flange 28 fitted at the lower end of the valve disc 22, the outer wall of the guide flange 28 being snapped between the lower connecting seat and the lower flange 30, and a second spiral wound gasket 27 provided at the lug of the guide flange 28 for waterproofing and sealing between the lower connecting seat and the lower flange; and a bushing 23, a second packing gasket, a second packing 25, a second packing gland 26, and a second clamping nut 29 arranged sequentially from top to bottom between the valve disc 22 and the guide flange 28, the second clamping nut 29 being threadedly connected to the guide flange 28, and a second spacer 24 being provided between the second packing 25. The lower flange 30 and the lower connecting seat have a locking notch on their opposite surfaces to limit the installation of the guide flange 28. A first spiral wound gasket 4 for waterproofing is provided between the lower flange 30 and the welding flange 3, and the welding flange 3 is locked and fixed by the first stud 1 and the first nut 2. The lower flange 30 and the lower connecting seat are locked and fixed by the second stud 5 and the second nut 6. After the lower flange 30 and the lower connecting seat are locked, a gap is formed between the guide flange 28 and the lower flange 30. This gap can buffer the desuperheating water and allow the desuperheating water to pass through.

[0034] In this embodiment, as Figure 2 As shown, throttling sleeves are provided on the inner walls of the upper and lower ends of the valve body 7 near the outer flow channel section, and throttling orifices are arrayed on the outer circumferential surface of the throttling sleeves. The throttling sleeves can throttle and regulate the medium flowing out of the pressure reducing channel, further making the pressure control of the desuperheating and pressure reducing valve smoother and more stable.

[0035] This embodiment provides a desuperheating and pressure-reducing valve. During the passage of the medium through the pressure-reducing channel, desuperheating water, supplied through the desuperheating water inlet D, can be ejected from the desuperheating water spray holes E1 and E2 on the upper and lower sections of the valve disc 22, cooling the medium. Furthermore, the desuperheating water spray holes E1 and E2 are angled, allowing the desuperheating water to cool in the direction of the medium's flow through the pressure-reducing channel. The desuperheating water and the medium can fully contact and evaporate within the pressure-reducing channel, resulting in high flexibility in adjustment during desuperheating and pressure reduction. In addition, the contact between the protrusion and the pressure-reducing channel reduces the force required on the valve stem 20 when the valve disc 22 opens the pressure-reducing channel, and the tighter contact when the valve disc 22 closes the pressure-reducing channel improves the valve's sealing performance, thus ensuring stable performance of the desuperheating and pressure-reducing valve.

[0036] The above provides a detailed description of the de-icing and pressure-reducing valve provided by this utility model. The specific embodiments are described only to aid in understanding the method and core concept of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A desuperheating and pressure-reducing valve, comprising a valve body, a valve disc, and a valve stem, wherein the valve body has a medium inlet and a medium outlet at both ends, and a medium flow channel is formed between the medium inlet and the medium outlet; characterized in that, The valve body is provided with a valve seat, which divides the medium flow channel into an inner flow channel section and an outer flow channel section. Pressure-reducing channels are formed on both the upper and lower walls of the valve seat, connecting the inner and outer flow channel sections. One end of the valve stem is connected to an actuator, which drives the valve stem to rotate. The other end of the valve stem extends from the upper end of the valve body into the interior of the valve body and is coaxially connected to the valve disc. The valve disc passes through the pressure-reducing channel and extends to the lower end of the valve body. An external protrusion that mates with the pressure-reducing channel is provided on the outer circumferential surface of the valve disc. A water passage is provided inside the valve disc along its length. A desuperheating water spray hole is formed through the external protrusion on the valve disc, obliquely extending from the inner flow channel section to the outer flow channel section. A desuperheating water inlet is provided at the lower end of the valve body, and the desuperheating water inlet, water passage, and desuperheating water spray hole are sequentially connected.

2. The desuperheating and pressure-reducing valve according to claim 1, characterized in that, The actuator can be a manual actuator or an electric actuator.

3. The desuperheating and pressure-reducing valve according to claim 1, characterized in that, The radial cross-section of the pressure-reducing channel is trapezoidal, and the length of the upper base of the trapezoid is greater than the length of the lower base.

4. The desuperheating and pressure-reducing valve according to claim 1, characterized in that, The lower end of the valve body is provided with a lower connecting seat, and a through hole is opened in the middle of the lower connecting seat. A second sealing component is provided in the through hole for sealing the lower end of the valve disc. A lower fixing member for fixing the second sealing component is installed on the end face of the lower connecting seat.

5. The desuperheating and pressure-reducing valve according to claim 4, characterized in that, The lower fixing component includes a lower flange installed on the end face of the lower connecting seat and a butt-welded flange installed on the bottom end of the lower flange; the lower flange and the butt-welded flange are provided with through holes along the center line of the valve disc to form the desuperheating water inlet.

6. The desuperheating and pressure-reducing valve according to claim 5, characterized in that, The second sealing assembly includes a guide flange sleeved on the lower end of the valve disc, the outer wall of the guide flange being snapped between the lower connecting seat and the lower flange; and a bushing, a second packing gasket, a second packing, a second packing gland, and a second clamping nut arranged sequentially from top to bottom between the valve disc and the guide flange, the second clamping nut being threadedly connected to the guide flange.

7. The desuperheating and pressure-reducing valve according to claim 1, characterized in that, The upper end of the valve body is provided with an upper connecting seat, and a valve cover is installed on the upper end of the upper connecting seat; a sealing cavity is opened in the middle of the upper end face of the valve cover, and a first sealing component is provided in the sealing cavity for sealing the valve stem.

8. The desuperheating and pressure-reducing valve according to claim 7, characterized in that, The first sealing assembly includes a first packing pad, a first packing, a first spacer ring, and a first packing gland arranged sequentially from bottom to top in the sealing cavity. The top of the valve cover is provided with a clamping member for pressing the first packing gland.

9. The desuperheating and pressure-reducing valve according to claim 1, characterized in that, Throttling sleeves are provided at the upper and lower ends of the valve body near the inner wall of the outer flow channel section, and throttling holes are arrayed on the outer circumferential surface of the throttling sleeves.

Images