Temperature and pressure reducing valve
By setting a secondary valve seat, a secondary valve flap and a second through-hole in the main valve flap of the temperature reduction and pressure reducing valve, and installing a spring on the secondary valve seat and the secondary valve flap, the problem of difficulty in disengaging the main valve flap is solved, achieving more efficient steam pressure reduction and temperature reduction effects.
Patent Information
- Application Number
- CN202421604071.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-09
AI Technical Summary
When the main valve flap and the main valve seat are closed, the pressure difference between the two sides of the valve body is too large, making it difficult for the main valve flap to disengage from the main valve seat, which in turn affects the pressure reduction and temperature reduction process of steam.
A temperature reduction and pressure reducing valve is designed. By setting a secondary valve seat, a secondary valve flap and a second through-hole in the main valve flap, and installing a spring on the secondary valve seat and the secondary valve flap, the pressure difference value on both sides of the main valve flap is reduced, and the convenience of the main valve flap is improved.
By reducing the opening resistance when the main valve disc is disengaged, the main valve disc is easier to disengage from the main valve seat, thereby improving the pressure reduction and temperature reduction efficiency of steam, simplifying operation, and improving working efficiency.
Smart Images
Figure CN222798242U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of temperature-reducing and pressure-reducing valves, in particular to a temperature-reducing and pressure-reducing valve. Background Art
[0002] The temperature reduction and pressure reduction device is widely used in thermal power plants, power plants, food and beverage processing, petrochemical industry, papermaking, seawater desalination and other important occasions to convert high-temperature and high-pressure steam into steam with temperature and pressure suitable for industrial production requirements, that is, to reduce pressure and reduce temperature. The temperature reduction and pressure reduction device is a combined structure and occupies a small space. The pressure reduction is completed by a separate steam pressure reducing valve and a throttling orifice plate. The temperature reduction is completed by a spring swirl atomizing nozzle desuperheater. For the primary steam transported upstream, according to customer needs, at least one pressure reduction unit is required to complete it. If the pressure difference between the pressure of the secondary steam required by the customer and the pressure of the primary steam is too large, multiple pressure reduction treatments are required. A more preferred method in the prior art is to use a cage-type multi-stage throttling method to achieve pressure reduction. The multi-stage pressure reduction eliminates the impact and vibration of the steam on the pipeline, reduces noise, and also avoids erosion of the valve port.
[0003] Although the pressure reduction process from primary steam to secondary steam can be achieved through multi-stage throttling, there are technical difficulties in this process. Specifically, since the pressure difference on both sides of the valve body is too large when the main valve disc and the main valve seat are closed, a very large driving force is required to enable the main valve disc to separate from the main valve seat. Then, the primary steam transported from the upstream can pass through the inner cavity of the main valve seat into the downstream dragon-type throttling mechanism to achieve the pressure reduction process. However, the prior art does not provide sufficient technical inspiration for this problem. Therefore, there is room for improvement to make it easier for the main valve disc to separate from the main valve seat, so that the primary steam can pass through the inner cavity of the main valve seat and enter the cage-type multi-stage throttling mechanism for pressure reduction and the cooling device further downstream for the cooling process. Summary of the invention
[0004] In view of the deficiencies in the prior art, the utility model provides a temperature-reducing and pressure-reducing valve which allows a main valve disc to be easily separated from a main valve seat, so as to overcome the defects in the prior art.
[0005] The technical scheme adopted by the utility model is: a temperature reducing and pressure reducing valve, comprising a valve body, a main valve seat is arranged in the valve body, a main valve disc is arranged on the main valve seat, a secondary valve seat is arranged at the bottom of the main valve disc, a secondary valve disc is arranged in the main valve disc above the secondary valve seat, a spring is arranged on the secondary valve disc and the secondary valve seat, a guide cage is arranged on the outer side of the main valve disc, a first through hole is arranged on the guide cage, an air inlet pipe is arranged on one side of the guide cage, a valve cover is arranged above the guide cage, a valve stem is arranged on the valve cover and the secondary valve disc, an inner cavity of the secondary valve seat and the first through hole are connected through a second through hole opened on the main valve disc, a throttling tube is arranged below the main valve disc, a throttling cage is arranged at the bottom of the main valve seat outside the throttling tube, a first throttling hole is arranged on the throttling tube, a second throttling hole is arranged on the throttling cage, an atomizing nozzle is arranged on the valve body below the throttling cage, and a rectifying orifice plate is arranged below the atomizing nozzle.
[0006] Preferably, the number of the first throttling holes and the number of the second throttling holes are both multiple, the multiple first throttling holes are evenly distributed on the throttling tube in a spiral ascending shape, the multiple second throttling holes are evenly distributed on the throttling cage sleeve in a spiral ascending shape, the throttling cage sleeve adopts a barrel-shaped structure with the open end facing the main valve seat, the throttling tube adopts a tubular structure, the first throttling hole and the inner cavity of the valve body outside the throttling cage sleeve are connected in sequence through the inner cavity of the throttling tube and the second throttling hole.
[0007] Preferably, a piston ring is provided on the main valve disc above the first through hole, and the piston ring and the guide cage are movably connected. The number of first through holes and the number of second through holes are both multiple, and the multiple first through holes and the multiple second through holes are uniformly distributed in a star shape on the outside of the central axis of the auxiliary valve seat, and the central axis of the auxiliary valve seat, the central axis of the main valve disc, the central axis of the valve stem and the central axis of the auxiliary valve disc are located on the same axis.
[0008] Preferably, a valve stem mounting groove is provided on the auxiliary valve flap, and a first guide block and a limit sleeve are arranged in the valve stem mounting groove from top to bottom in sequence, the first guide block is installed on the bottom end of the valve stem, the limit sleeve is movably mounted on the valve stem, the limit sleeve is connected to the auxiliary valve flap, and the bottom surface of the first guide block adopts an arc surface structure, and guide devices are provided on the main valve flap and the auxiliary valve flap, and the guide device includes a second guide block provided on the auxiliary valve flap and a guide groove provided on the main valve flap, the guide groove extends in a direction from close to the auxiliary valve seat to away from the auxiliary valve seat, and the second guide block adopts a block structure that can slide along the extension direction of the guide groove.
[0009] Preferably, a first sealing packing is arranged between the valve body and the main valve seat, a second sealing packing is arranged between the valve cover and the valve body, a first packing pressure ring is arranged above the second sealing packing, and a limiting pressure block is arranged in the valve body above the first packing pressure ring. The number of limiting pressure blocks is several, and the several limiting pressure blocks are evenly distributed in a star shape on the outside of the center axis of the valve cover, and the center axis of the valve cover and the center axis of the valve stem are located on the same axis.
[0010] Preferably, an annular wing plate is provided on the outer side of the valve cover, a packing sealing groove is opened on the top of the valve cover along the direction from top to bottom, a packing gasket ring, a third sealing packing and a second packing pressure ring are arranged in sequence in the packing sealing groove along the direction from bottom to top, the packing gasket ring, the third sealing packing and the second packing pressure ring are all mounted on the valve stem, a packing pressure plate is provided on the valve stem above the second packing pressure ring, and adjusting bolts are provided on the packing pressure plate and the annular wing plate.
[0011] Preferably, a clamping plate is provided on the valve cover and the valve body, the annular wing plate is located above the clamping plate, a limiting ring is provided on the valve cover, the bottom of the limiting ring and the top of the annular wing plate are abutted against each other, a first fixing bolt is provided on the limiting ring and the annular wing plate, the first fixing bolt and the annular wing plate are threadedly connected, and the first fixing bolt and the limiting ring are movably connected.
[0012] The beneficial effects of the utility model are as follows: firstly, the utility model arranges the auxiliary valve seat, the auxiliary valve flap and the second through hole in the main valve flap, and combines the auxiliary valve seat and the spring installed on the auxiliary valve flap, so that after the auxiliary valve flap and the auxiliary valve seat are separated, the superheated steam transported through the intake pipe is transported to the bottom of the main valve flap through the first through hole, the second through hole and the inner cavity of the auxiliary valve seat in sequence, thereby reducing the pressure difference on both sides of the main valve flap, reducing the opening resistance encountered by the main valve flap when it moves upward, thereby making it easy for the main valve flap to separate from the main valve seat, making the product easy to use.
[0013] Secondly, the auxiliary valve disc and the auxiliary valve seat of the utility model are provided with springs, and the elastic force generated by the spring reset is utilized to reduce the resistance encountered by the auxiliary valve disc when it is separated from the auxiliary valve seat.
[0014] Thirdly, a second sealing filler is provided between the valve cover and the valve body of the utility model, and installing the second sealing filler facilitates narrowing the gap between the valve cover and the valve body.
[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A.
[0018] Figure 3 for Figure 1 A partial enlarged schematic diagram of detail B. DETAILED DESCRIPTION
[0019] like Figures 1 to 3As shown, a temperature reduction and pressure reducing valve comprises a valve body 1, a main valve seat 2 is arranged in the valve body 1, a main valve disc 3 is arranged on the main valve seat 2, an auxiliary valve seat 4 is arranged at the bottom of the main valve disc 3, an auxiliary valve disc 5 is arranged in the main valve disc 3 above the auxiliary valve seat 4, a spring 6 is arranged on the auxiliary valve disc 5 and the auxiliary valve seat 4, a guide cage 7 is arranged on the outside of the main valve disc 3, a first through hole 8 is arranged on the guide cage 7, an air inlet pipe 9 is arranged on the valve body 1 on one side of the guide cage 7, a valve cover 10 is arranged above the guide cage 7, a valve stem 11 is arranged on the valve cover 10 and the auxiliary valve disc 5, an inner cavity of the auxiliary valve seat 4 and the first through hole 8 are connected through a second through hole 12 opened on the main valve disc 3, a throttle tube 13 is arranged below the main valve disc 3, and the throttle tube 13 A throttling cage 14 is arranged at the bottom of the outer main valve seat 2, a first throttling hole 15 is arranged on the throttling tube 13, a second throttling hole 16 is arranged on the throttling cage 14, an inner liner 40 is arranged in the valve body 1 outside the throttling cage 14, an atomizing nozzle 17 is arranged on the inner liner 40 and the valve body 1, the atomizing nozzle 17 is located below the throttling cage 14, a rectifying orifice plate 18 is arranged below the atomizing nozzle 17, a fixing ring 41 is arranged above the rectifying orifice plate 18, a movable ring 42 is arranged below the rectifying orifice plate 18, a second fixing bolt 43 is arranged on the rectifying orifice plate 18, the fixing ring 41 and the movable ring 42, and the diameter of the inner cavity at the top of the fixing ring 41 gradually decreases as the height of the fixing ring 41 decreases.
[0020] The number of the first throttling holes 15 and the number of the second throttling holes 16 are both multiple. The multiple first throttling holes 15 are evenly distributed on the throttling tube 13 in a spiral ascending shape, and the multiple second throttling holes 16 are evenly distributed on the throttling cage 14 in a spiral ascending shape. The throttling cage 14 adopts a barrel-shaped structure with the open end facing the main valve seat 2, and the throttling tube 13 adopts a tubular structure. The first throttling holes 15 and the inner cavity of the valve body 1 outside the throttling cage 14 are connected in sequence through the inner cavity of the throttling tube 13 and the second throttling holes 16. The aperture of the first throttling hole 15 located at the top is not larger than the aperture of the first throttling hole 15 located at the bottom, and the aperture of the second throttling hole 16 located at the top is not smaller than the aperture of the second throttling hole 16 located at the bottom; as the position of the throttling tube 13 rises, the number of the first throttling holes 15 located above the main valve seat 2 gradually increases, and also because as the position of the throttling tube 13 rises, the number of the second throttling holes 16 located outside the throttling tube 13 gradually decreases, thereby realizing a gradual reduction in the throttling amplitude through the intake pipe 9, the first through hole 8, the first throttling hole 15 above the main valve seat 2, the inner cavity of the throttling tube 13 and the second throttling hole 16 located below the throttling tube 13, so that the resistance encountered by the main valve flap 3 in the process of rising is gradually reduced, thereby facilitating the main valve flap 3 to rise at a uniform speed.
[0021] A flow guiding protrusion 19 is arranged in the throttling cage 14 below the throttling tube 13, and the diameter of the circumscribed circle of the flow guiding protrusion 19 gradually increases as the height decreases. It is convenient to guide the steam that is about to pass through the second throttling hole 16 below the throttling tube 13, and at the same time, it is also prevented that the steam does excessive work on the bottom surface of the throttling cage 14, causing the throttling cage 14 to vibrate excessively, and then the throttling cage 14 drives the main valve seat 2 and the valve body 1 to vibrate synchronously; the main valve seat 2 and the main valve disc 3 are in a closed state, and part of the second throttling hole 16 is located below the throttling tube 13; so that after the auxiliary valve disc 5 is separated from the auxiliary valve seat 4, the primary steam is transported from the intake pipe 9 to the valve body 1, and then the primary steam that enters the inner cavity of the throttling tube 13 through the first through hole 8, the second through hole 12 and the inner cavity of the auxiliary valve seat 4 in sequence can be transported to the valve body 1 outside the throttling cage 14 through the part of the second throttling hole 16 located below the throttling tube 13, so that after the auxiliary valve disc 5 is separated from the auxiliary valve seat 4, the auxiliary valve disc 5 drives the main valve disc 3 to do the lifting movement, and the technical problem of excessive instantaneous resistance change of the main valve disc 3 is avoided. A piston ring 20 is arranged on the main valve disc 3 above the first through hole 8, and the piston ring 20 is movably connected to the guide cage 7. The number of the first through holes 8 and the number of the second through holes 12 are both multiple, and the multiple first through holes 8 and the multiple second through holes 12 are uniformly distributed in a star shape outside the central axis of the auxiliary valve seat 4, and the central axis of the auxiliary valve seat 4, the central axis of the main valve disc 3, the central axis of the valve stem 11 and the central axis of the auxiliary valve disc 5 are located on the same axis.
[0022] The auxiliary valve disc 5 is provided with a valve stem mounting groove 21, which adopts a stepped groove structure. The valve stem mounting groove 21 is provided with a first guide block 22 and a limit sleeve 23 from top to bottom. The limit sleeve 23 is installed in the large head end of the valve stem mounting groove 21, and the first guide block 22 is installed in the small head end of the valve stem mounting groove 21. The first guide block 22 is installed on the bottom end of the valve stem 11, and the limit sleeve 23 is movably sleeved on the valve stem 11. The limit sleeve 23 is connected to the auxiliary valve disc 5, and the bottom surface of the first guide block 22 adopts an arc surface structure, so as to facilitate guiding the auxiliary valve disc 5, so that the auxiliary valve disc 5 can be easily fitted to the auxiliary valve disc 5. On the valve seat 4; the main valve flap 3 and the auxiliary valve flap 5 are provided with guide devices, and the guide devices include a second guide block 24 provided on the auxiliary valve flap 5 and a guide groove 25 opened on the main valve flap 3, and the guide groove 25 extends from the direction close to the auxiliary valve seat 4 to the direction away from the auxiliary valve seat 4, and the second guide block 24 adopts a block structure that can slide along the extension direction of the guide groove 25; the number of the guide devices is several, and the several guide devices are evenly distributed in a star shape on the outside of the central axis of the valve stem 11, and the installation of several guide devices facilitates the limitation of the movement direction of the auxiliary valve flap 5.
[0023] A first sealing filler 26 is arranged between the valve body 1 and the main valve seat 2. The first sealing filler 26 adopts a spiral wound gasket whose filler is flexible graphite. A second sealing filler 27 is arranged between the valve cover 10 and the valve body 1. The second sealing filler 27 adopts an annular structure made of flexible graphite. A first filler pressure ring 28 is arranged above the second sealing filler 27. A limiting pressure block 29 is arranged in the valve body 1 above the first filler pressure ring 28. The number of limiting pressure blocks 29 is several, and the several limiting pressure blocks 29 are evenly distributed in a star shape on the outside of the central axis of the valve cover 10. The central axis of the valve cover 10 and the central axis of the valve stem 11 are located on the same axis. The first packing pressure ring 28 and the second sealing packing 27 both adopt an annular structure. The diameter of the inscribed circle at the bottom of the second sealing packing 27 gradually increases with the increase of the height of the second sealing packing 27. The shape of the second sealing packing 27 and the shape of the first packing pressure ring 28 are matched with the partial shape of the valve cover 10. The outer diameter of the first packing pressure ring 28 corresponds to the outer diameter of the second sealing packing 27, and the maximum inner diameter of the second sealing packing 27 corresponds to the inner diameter of the first packing pressure ring 28.
[0024] An annular wing plate 30 is arranged on the outer side of the valve cover 10, and a packing sealing groove 31 is opened on the top of the valve cover 10 along the direction from top to bottom. A packing gasket 32, a third sealing packing 33 and a second packing pressure ring 34 are arranged in sequence from bottom to top in the packing sealing groove 31. The packing gasket 32, the third sealing packing 33 and the second packing pressure ring 34 are all mounted on the valve stem 11. A packing pressure plate 35 is arranged on the valve stem 11 above the second packing pressure ring 34. The diameter of the circumscribed circle at the top of the second packing pressure ring 34 gradually increases as the height of the second packing pressure ring 34 decreases. The partial shape of the top of the packing pressure plate 35 matches the shape of the top of the second packing pressure ring 34. Adjustment bolts 36 are arranged on the packing pressure plate 35 and the annular wing plate 30. A clamping plate 37 is provided on the valve cover 10 and the valve body 1, and the annular wing plate 30 is located above the clamping plate 37. A limiting ring 38 is provided on the valve cover 10. The limiting ring 38 adopts an annular structure composed of a plurality of arc-shaped rods arranged end to end in sequence. The limiting ring 38 is connected to the valve cover 10, and the bottom of the limiting ring 38 and the top of the annular wing plate 30 are abutted. A first fixing bolt 39 is provided on the limiting ring 38 and the annular wing plate 30, and the first fixing bolt 39 is threadedly connected to the annular wing plate 30, and the first fixing bolt 39 and the limiting ring 38 are movably connected.
[0025] The usage of this product is as follows: Figures 1 to 3 As shown, the following steps are included:
[0026] S1. The high-pressure steam transported from the upstream enters the inner cavity of the valve body 1 through the air inlet pipe 9. When it is necessary to transport the secondary steam after cooling and pressure reduction to the downstream, the valve stem 11 is driven to move upward. The upward movement of the valve stem 11 and the elastic force generated by the reset of the spring 6 drive the auxiliary valve flap 5 to move upward until the auxiliary valve flap 5 and the auxiliary valve seat 4 are separated, and finally the auxiliary valve flap 5 moves to the preset position in the main valve flap 3. During this period, the steam entering the inner cavity of the valve body 1 enters the valve body 1 below the throttling cage 14 through the first through hole 8, the second through hole 12, the inner cavity of the auxiliary valve seat 4, the inner cavity of the throttling tube 13 and the second throttling hole 16 located below the throttling tube 13 in sequence, thereby increasing the pressure of the throttling tube 13 below the main valve flap 3.
[0027] S2. After the auxiliary valve flap 5 moves to the preset position in the main valve flap 3, the auxiliary valve flap 5 and the main valve flap 3 move upward synchronously. During this period, the primary steam entering the inner cavity of the valve body 1 from the air inlet pipe 9 is divided into two parts. The first part of the primary steam still enters the valve body 1 below the throttling cage 14 through the first through hole 8, the second through hole 12, the inner cavity of the auxiliary valve seat 4, the inner cavity of the throttling tube 13 and the second throttling hole 16 located below the throttling tube 13 in sequence; the second part of the primary steam enters the valve body 1 below the throttling cage 14 through the first through hole 8, the first throttling hole 15, the inner cavity of the throttling tube 13 and the second throttling hole 16 located below the throttling tube 13 in sequence.
[0028] S3, the position of the main valve disc 3 continues to rise to the preset position, at which time all the first throttling holes 15 are located above the main valve seat 2, and all the second throttling holes 16 are located below the throttling tube 13. At this time, the primary steam entering the inner cavity of the valve body 1 from the air inlet pipe 9 passes through the first through hole 8, the first throttling hole 15, the inner cavity of the throttling tube 13 and the second throttling hole 16 located below the throttling tube 13 in turn and enters the valve body 1 below the throttling cage 14 to complete the pressure reduction to obtain the reduced-pressure steam. The reduced-pressure steam continues to move forward and mixes with the deionized water sprayed into the inner cavity of the valve body 1 through the atomizing nozzle 17 to form the reduced-pressure and cooled steam, and then continues to move forward through the rectifying orifice plate 18 to eliminate turbulence and then be delivered to downstream customers.
[0029] Through this embodiment, it is achieved that by using the auxiliary valve seat 4, the auxiliary valve flap 5 and the second through hole 12 arranged in the main valve flap 3, combined with the spring 6 installed on the auxiliary valve seat 4 and the auxiliary valve flap 5, after the auxiliary valve flap 5 and the auxiliary valve seat 4 are separated, the superheated steam transported through the intake pipe 9 is transported to the bottom of the main valve flap 3 through the first through hole 8, the second through hole 12 and the inner cavity of the auxiliary valve seat 4 in sequence, thereby reducing the pressure difference on both sides of the main valve flap 3, reducing the opening resistance encountered by the main valve flap 3 when moving upward, thereby facilitating the main valve flap 3 to separate from the main valve seat 2, making this product easy to use.
[0030] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.
Claims
1. A temperature and pressure reducing valve, characterized in that: The invention comprises a valve body (1), wherein a main valve seat (2) is arranged in the valve body (1), a main valve disc (3) is arranged on the main valve seat (2), an auxiliary valve seat (4) is arranged at the bottom of the main valve disc (3), an auxiliary valve disc (5) is arranged in the main valve disc (3) above the auxiliary valve seat (4), a spring (6) is arranged on the auxiliary valve disc (5) and the auxiliary valve seat (4), a guide cage (7) is arranged on the outside of the main valve disc (3), a first through hole (8) is arranged on the guide cage (7), an air inlet pipe (9) is arranged on one side of the guide cage (7), a valve cover (10) is arranged above the guide cage (7), and the valve cover (10) and the auxiliary valve seat (4) are connected. A valve stem (11) is provided on the valve disc (5); an inner cavity of the auxiliary valve seat (4) and the first through hole (8) are connected via a second through hole (12) provided on the main valve disc (3); a throttling tube (13) is provided below the main valve disc (3); a throttling cage (14) is provided at the bottom of the main valve seat (2) outside the throttling tube (13); a first throttling hole (15) is provided on the throttling tube (13); a second throttling hole (16) is provided on the throttling cage (14); an atomizing nozzle (17) is provided on the valve body (1) below the throttling cage (14); and a rectifying orifice plate (18) is provided below the atomizing nozzle (17).
2. The temperature and pressure reducing valve according to claim 1, characterized in that: The number of the first throttling holes (15) and the number of the second throttling holes (16) are both multiple. The multiple first throttling holes (15) are evenly distributed on the throttling tube (13) in a spiral ascending shape. The multiple second throttling holes (16) are evenly distributed on the throttling cage (14) in a spiral ascending shape. The throttling cage (14) has a barrel-shaped structure with its open end facing the main valve seat (2). The throttling tube (13) has a tubular structure. The first throttling holes (15) and the inner cavity of the valve body (1) outside the throttling cage (14) are connected in sequence through the inner cavity of the throttling tube (13) and the second throttling holes (16).
3. The temperature and pressure reducing valve according to claim 1, characterized in that: A piston ring (20) is provided on the main valve disc (3) above the first through hole (8), and the piston ring (20) is movably connected to the guide cage (7). The number of the first through holes (8) and the number of the second through holes (12) are both multiple, and the multiple first through holes (8) and the multiple second through holes (12) are uniformly distributed in a star shape outside the central axis of the auxiliary valve seat (4). The central axis of the auxiliary valve seat (4), the central axis of the main valve disc (3), the central axis of the valve stem (11) and the central axis of the auxiliary valve disc (5) are located on the same axis.
4. The temperature and pressure reducing valve according to claim 1, characterized in that: The auxiliary valve flap (5) is provided with a valve stem mounting groove (21), and a first guide block (22) and a limit sleeve (23) are arranged in sequence from top to bottom in the valve stem mounting groove (21); the first guide block (22) is mounted on the bottom end of the valve stem (11), and the limit sleeve (23) is movably sleeved on the valve stem (11); the limit sleeve (23) and the auxiliary valve flap (5) are connected; the bottom surface of the first guide block (22) adopts an arc surface structure; the main valve flap (3) and the auxiliary valve flap (5) are provided with guide devices, and the guide devices include a second guide block (24) arranged on the auxiliary valve flap (5) and a guide groove (25) arranged on the main valve flap (3); the guide groove (25) extends in a direction from close to the auxiliary valve seat (4) to away from the auxiliary valve seat (4); and the second guide block (24) adopts a block structure capable of sliding along the extension direction of the guide groove (25).
5. The temperature and pressure reducing valve according to claim 1, characterized in that: A first sealing packing (26) is arranged between the valve body (1) and the main valve seat (2), a second sealing packing (27) is arranged between the valve cover (10) and the valve body (1), a first packing pressure ring (28) is arranged above the second sealing packing (27), and a limiting pressure block (29) is arranged in the valve body (1) above the first packing pressure ring (28), and the number of the limiting pressure blocks (29) is adopted. The limiting pressure blocks (29) are evenly distributed in a star shape outside the center axis of the valve cover (10), and the center axis of the valve cover (10) and the center axis of the valve stem (11) are located on the same axis.
6. The temperature and pressure reducing valve according to claim 1, characterized in that: An annular wing plate (30) is arranged on the outer side of the valve cover (10), a packing sealing groove (31) is opened on the top of the valve cover (10) along the direction from top to bottom, a packing gasket (32), a third sealing packing (33) and a second packing pressure ring (34) are arranged in sequence in the packing sealing groove (31) along the direction from bottom to top, the packing gasket (32), the third sealing packing (33) and the second packing pressure ring (34) are all mounted on the valve stem (11), a packing pressure plate (35) is arranged on the valve stem (11) above the second packing pressure ring (34), and an adjusting bolt (36) is arranged on the packing pressure plate (35) and the annular wing plate (30).
7. The temperature and pressure reducing valve according to claim 6, characterized in that: A clamping plate (37) is provided on the valve cover (10) and the valve body (1), the annular wing plate (30) is located above the clamping plate (37), a limiting ring (38) is provided on the valve cover (10), the bottom of the limiting ring (38) and the top of the annular wing plate (30) are abutted against each other, a first fixing bolt (39) is provided on the limiting ring (38) and the annular wing plate (30), the first fixing bolt (39) and the annular wing plate (30) are threadedly connected, and the first fixing bolt (39) and the limiting ring (38) are movably connected.