CN212564643U - Valve device - Google Patents

Abstract

The utility model provides a valve device, includes seal assembly, seal assembly includes connecting seat, sealing member and sealing ring, and the sealing ring includes first recess portion, and the sealing member is located the periphery of sealing ring, and part sealing member is located the first vallecular cavity that first recess portion formed, and sealing member and first recess portion butt, sealing member have certain pretightning force to the sealing ring, and the seal ring that is equipped with the sealing member is pressed into the assembly intracavity of connecting seat, and the sealing member is compressed tightly between sealing ring and connecting seat. Like this, sealing member and sealing ring assemble earlier integratively, form seal assembly with the connecting seat assembly again, are favorable to making things convenient for seal assembly's assembly forming, improve assembly efficiency.

Description

Valve device

[ technical field ] A method for producing a semiconductor device

The utility model relates to a valve device

[ background of the invention ]

In an automobile air conditioning system, in order to improve the flow control precision of fluid, a valve device is adopted as a throttling element, and the valve device can realize a throttling function through forward flow or reverse flow of the fluid according to the requirements of the system. The inventor is aware of valve devices comprising a seal assembly and how to facilitate assembly of the seal assembly is a technical problem to be improved upon.

[ Utility model ] content

An object of the utility model is to provide a valve gear is favorable to making things convenient for seal assembly's assembly forming.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a valve apparatus comprising a valve member including a seal assembly including a connecting seat, a seal, and a seal ring, wherein: the connecting seat comprises a first step portion, the connecting seat is provided with an assembly cavity, the sealing ring comprises a first groove portion, the sealing element is located on the periphery of the sealing ring, part of the sealing element is located in a first groove cavity formed by the first groove portion, the sealing element is abutted against the first groove portion, the sealing element is opposite to the sealing ring and has pretightening force, the sealing ring assembled with the sealing element is pressed into the assembly cavity, the sealing ring is abutted against the first step portion, the sealing element is abutted against the connecting seat, and the sealing element is pressed between the sealing ring and the connecting seat.

The utility model provides a valve gear, including seal assembly, seal assembly includes connecting seat, sealing member and sealing ring, and the sealing ring includes first concave part, and the sealing member is located the periphery of sealing ring, and partial sealing member is located the first vallecular cavity that first concave part formed, and sealing member and first concave part butt, sealing member have certain pretightning force to the sealing ring, are equipped with the seal ring pressure of sealing member and pack into the assembly intracavity of connecting seat, and the sealing member is compressed tightly between sealing ring and connecting seat. Like this, sealing member and sealing ring assemble earlier integratively, form seal assembly with the connecting seat assembly again, are favorable to making things convenient for seal assembly's assembly forming, improve assembly efficiency.

[ description of the drawings ]

FIG. 1 is a cross-sectional structural schematic view of an embodiment of a valve apparatus;

FIG. 2 is a schematic cross-sectional view of the valve member of FIG. 1;

FIG. 3 is a cross-sectional structural view of the nut holder of FIG. 2;

FIG. 4 is a cross-sectional structural view of the seal assembly of FIG. 2;

FIG. 5 is a perspective view of the seal ring of FIG. 4;

fig. 6 is a perspective view of the connecting socket of fig. 4;

FIG. 7 is a cross-sectional view of the cartridge seat of FIG. 2;

FIG. 8 is a cross-sectional structural schematic view of another embodiment of a valve member;

FIG. 9 is a cross-sectional structural view of the valve seat member of FIG. 1;

FIG. 10 is another cross-sectional structural schematic view of the valve assembly of FIG. 1;

fig. 11 is a partially enlarged sectional structure diagram of a portion a in fig. 2.

[ detailed description ] embodiments

The invention will be further described with reference to the following drawings and specific embodiments:

referring to fig. 1, the valve apparatus 100 may be applied to an air conditioning system of an automobile, and includes a control member 1, a valve member 2, and a valve seat member 3, the valve member 2 being connected to the valve seat member 3, the control member 1 being located at an outer periphery of the valve member 2, the control member 1 being connected to the valve seat member 3, and the valve apparatus 100 being electrically and/or signal-connected to the outside through the control member 1.

Referring to fig. 1, the control component 1 includes an outer housing 11, a stator assembly 12, a circuit board 13 and an interface portion 14, the stator assembly 12 includes a coil winding 121 and a first pin 122, and in this embodiment, the coil winding 121, the first pin 122 and the like are used as injection inserts and are integrally injection-molded to form the outer housing 11; the control component 1 is provided with a control cavity 15, the circuit board 13 is positioned in the control cavity 15, one end of the first pin 122 is packaged in the outer shell 11 and is electrically and/or signal-connected with the coil winding 121, and the other end of the first pin 122 is positioned in the control cavity 15 and is electrically and/or signal-connected with the circuit board 13; the interface part 14 comprises a second pin 141, the second pin 141 is used as an injection insert, the interface part 14 and the outer shell 11 are integrally injection molded, the interface part 14 is provided with a plug cavity 142, one end of the second pin 141 is located in the control cavity 15 and is electrically connected and/or signal connected with the circuit board 13, and the other end of the second pin 141 is located in the plug cavity 142 and is used for being electrically connected and/or signal connected with the outside.

Referring to fig. 2, the valve member 2 includes a valve core assembly 21, a transmission member 22, a rotor assembly 23, a connector 24, a seal assembly 25, a valve core seat 26, and a sleeve 27. The valve core assembly 21 comprises a screw 211 and a valve core 212, an external thread section is arranged on part of the peripheral wall of the screw 211, the valve core assembly 21 is provided with a first accommodating cavity 213, the valve core assembly 21 further comprises an elastic element 214, the elastic element 214 is positioned in the first accommodating cavity 213, the elastic element 214 is in a compression deformation state, the screw 211 is connected with the valve core 212 through the elastic element 214, and the valve core 212 can move relative to the screw 211 along the axial direction through the arrangement of the elastic element 214, so that the valve core 212 has a certain adjustment or compensation amount in the axial direction; on the other hand, by arranging the elastic element 214, the return difference generated when the screw rod 211 is in threaded fit with other parts can be eliminated, and the assembly precision can be ensured.

Referring to fig. 2, the transmission member 22 includes a nut seat 221, the nut seat 221 includes a fitting portion 2211, the connecting member 24 includes a first side portion 241, and the fitting portion 2211 is in guiding fit with the first side portion 241, so that the fitting portion 2211 abuts against the first side portion 241, and the coaxiality of the nut seat 221 and the connecting member 24 is ensured; the nut seat 221 is fixedly connected to the connecting member 24, in this embodiment, the transmission member 22 further includes a connecting plate 222, the connecting plate 222 is an injection insert and is integrally formed by injection molding, and the connecting plate 222 is welded and fixed to the connecting member 24, so as to fixedly connect the nut seat 221 to the connecting member 24. Referring to fig. 3, the nut seat 221 further includes a hole 2212, and an internal thread section is disposed on a part of the peripheral side wall of the hole 2212; referring to fig. 2, the lead screw 211 is in threaded fit with the nut holder 221, a free end of the lead screw 211 penetrates through the hole 2212 from the lower end of the nut holder 221, a portion of the lead screw 221 penetrating through the hole 2212 is fixedly connected with the rotor assembly 23, a portion of the sleeve 27 is sleeved on the radial periphery of the rotor assembly 23, and the sleeve 27 is fixedly connected with the connecting piece 24. Referring to fig. 1, under the excitation of the magnetic field of the stator assembly 12, the rotor assembly 23 can drive the screw rod 211 to rotate, the screw rod 211 is in threaded fit with the nut seat 221, and the nut seat 221 is fixedly arranged, so that the screw rod 221 can reciprocate axially under the action of the threads, the screw rod 211 is connected with the valve core 212, and the movement of the screw rod 211 can drive the valve core 212 to move axially.

Referring to fig. 4 to 6, the sealing assembly 25 includes a connecting seat 251, a sealing element 252 and a sealing ring 253, in the embodiment, the sealing ring 253 is integrally injection molded, and the sealing ring 253 may be made of Polytetrafluoroethylene (PTFE), but as another embodiment, the sealing ring 253 may also be made of a mixture of PTFE and other materials or other plastic materials with hardness and elasticity. The sealing ring 253 comprises a through hole 2531 and a first groove portion 2532, the connecting seat 251 comprises a first step portion 2511, the connecting seat 251 is provided with an assembly cavity 2512, the sealing element 252 is sleeved on the radial periphery of the sealing ring 253, part of the sealing element 252 is positioned in the first groove cavity formed by the first groove portion 2532, through size design, the sealing element 252 can be abutted against the first groove portion 2532, and the sealing element 252 has certain pretightening force on the first groove portion 2532 to prevent the sealing element 252 from falling off in the assembly process; the sealing ring 253 assembled with the sealing element 252 is pressed into the assembly cavity 2512 in an interference manner, the sealing ring 253 is abutted against the first step portion 2511, the sealing element 252 is abutted against the connecting seat 251, the sealing element 252 is abutted against the first groove portion 2532, the sealing element 252 is in a sealing and pressing state, and the sealing ring 253 and the sealing element 252 can be assembled and molded firstly and then are subjected to interference press-fitting with the connecting seat 251 by virtue of the first groove portion 2532 arranged on the sealing ring 253.

Referring to fig. 2, the sealing assembly 25 is located at the radial periphery of the valve core 212, specifically, the sealing ring 253 is in interference fit with the outer peripheral wall of the valve core 212 through the through hole 2531, the peripheral side wall of the through hole 2531 abuts against the outer peripheral wall of the valve core 212, and at the same time, the sealing ring 253 is in a tensioned state, and the sealing ring 253 has a certain pre-tightening force on the valve core 212, so that the sealing ring 253 plays a role in guiding the axial movement of the valve core 212 on the one hand, which is beneficial to ensuring the coaxiality of the valve core 212, and on the other hand. In the valve component 2, the nut seat 221 is in threaded fit with the valve core assembly 21, the nut seat 221 is in guide fit with the connecting piece 24, and the sealing ring 253 is in interference fit with the valve core 212, so that in the constrained guide of the nut seat 221 and the valve core assembly 21, the coaxiality of the valve core assembly 21, particularly the coaxiality of the valve core 212 and the valve port 263, can be well ensured, and thus, in the assembling and moving processes of the valve core assembly 21, the risk of shaking or deviation of the valve core 212 is favorably reduced, and the impact of the valve core 212 on the valve port 263 is reduced. The connecting seat 251 is a metal member, and the connecting seat 251 and the outer peripheral wall of the valve core 212 may be arranged to be in clearance fit, which is beneficial to prevent friction loss when the valve core 212 and the connecting seat 251 move relatively, and similarly, the connecting member 24 and the outer peripheral wall of the valve core 212 are also in clearance fit. The connecting seat 251 and the connecting member 24 are respectively formed and fixedly connected, in this embodiment, the connecting seat 251 and the connecting member 24 are welded and fixed, but as another embodiment, the connecting seat 251 and the connecting member 24 may also be integrally formed or fixed by glue or assembly. Referring to fig. 4 and 2, the connecting seat 251 further includes a first welding portion 2513 and a second step portion 2514, the connecting seat 251 is welded and fixed with the connecting piece 24 through the first welding portion 2513, the connecting piece 24 abuts against the second step portion 2514, and the height H of the first welding portion 2513 is set to be smaller than the height H of the sealing ring 253, so that the sealing ring 253 assembled with the sealing element 252 is conveniently pressed into the assembly cavity 2512 of the connecting seat 251, and the assembly molding of the sealing assembly 25 is facilitated; on the other hand, if the height H of the first welding portion 2513 is too small, when the connecting seat 251 and the connecting member 24 are welded and fixed, the welding heat source is close to the sealing member 252, which may cause thermal deformation of the sealing member 252 and affect the sealing performance of the sealing member 252, and therefore, the height H of the first welding portion 2513 may be set to 0.4H to 0.8H (H is the height of the sealing ring 253). Similarly, if the width W of the first welding portion 2513 is too narrow, it is not favorable for the welding between the connecting seat 251 and the connecting member 24 to be firm, and if the width W of the first welding portion 2513 is too wide, the heat source of welding is closer to the sealing member 252, which may affect the sealing performance of the sealing member 252, so the width W of the first welding portion 2513 may be set to 0.3W-0.5W (W is the width of the second step portion 2514).

Referring to fig. 2, the valve core seat 26 is fixedly connected to the connecting seat 251, in this embodiment, the valve core seat 26 is fixedly welded to the connecting seat 251, but as another embodiment, the valve core seat 26 and the connecting seat 251 may also be integrally formed or fixed by adhesive or assembly. In the embodiment, the connecting member 24, the connecting seat 251 and the valve core seat 26 are provided as separate structures, so that the parts of each part can be conveniently machined and molded. Referring to fig. 7, the cartridge seat 26 includes a communication hole 261, a third step portion 262 and a valve port 263, the cartridge seat 26 has a first cavity 264 and a second cavity 265, the valve port 263 communicates the first cavity 264 and the second cavity 265, the communication hole 261 communicates with the first cavity 264, the number of the communication holes 261 is at least one, and in the present embodiment, the number of the communication holes 261 is four and is symmetrically arranged. Referring to fig. 7, the valve core seat 26 further includes a second welding portion 267, referring to fig. 4, the connecting seat 251 further includes a guiding side 2515, referring to fig. 2, the valve core seat 26 is in guiding fit and welded and fixed with the connecting seat 251 through the second welding portion 267, a side portion of the second welding portion 267 abuts against the guiding side 2515 of the connecting seat 251, a lower end surface of the connecting seat 251 abuts against the third step portion 262, and an end surface of the connecting seat 251 close to the valve port 263 is defined as a lower end surface, which is beneficial to ensuring coaxiality of the valve core seat 26 and the connecting seat 251, and thus beneficial to ensuring coaxiality of the valve. Referring to fig. 2, it is defined that the axial direction of the valve core 212 is, the movement of the valve core 212 away from the nut seat 221 is a downward movement, the movement of the valve core 212 close to the nut seat 221 is an upward movement, when the valve core 212 moves downward in the axial direction, the free end of the valve core 212 passes through the first cavity 264 and the valve port 263 and enters the second cavity 265, and the valve core 212 can abut against the valve port 263 at the valve port and form a hard seal, at this time, the first cavity 264 and the second cavity 265 are not communicated; when the spool 212 moves upward in the axial direction, the spool 212 forms a fit clearance with the valve port 263, and the opening degree of the valve port 263 increases with the upward movement of the spool 212, so that when the spool 212 moves in the axial direction, the spool 212 can adjust the opening degree of the valve port 263 by being close to or far from the valve port 263, and a throttle is formed at the valve port 263 by changing the fluid sectional area of the valve port 263; of course, with the continuous upward movement of the valve core 212, the first cavity 264 and the second cavity 265 can also be communicated (un-throttled) through the valve port 263, i.e., the valve core 212 can make and break the first cavity 264 and the second cavity 265.

Referring to fig. 2 and 7, by setting the width L1 of the third step 262 to be smaller than the width L2 of the lower end surface of the connecting seat 251, and/or setting the fourth step 266 between the communication hole 261 and the first chamber 264, i.e., the valve seat 26 further includes the fourth step 266, so (see fig. 2) a buffer chamber 28 is formed between the valve element 212, the connecting seat 251 and the valve seat 26, i.e., the valve member 2 includes the buffer chamber 28, the buffer chamber 28 communicates with the communication hole 261, the height D of the buffer chamber 28 is greater than the height D of the communication hole 261, the buffer chamber 28 includes a part of the first chamber 264, the buffer chamber 28 is set to be beneficial to buffering the impact force on the valve element 212 when the fluid flows in from the communication hole 261, and in the present embodiment, the communication hole 261 is symmetrically set to be beneficial to mutually offset the impact force on the valve element 212 when the fluid flows in from different communication holes, the valve core 212 is less affected by the fluid, and the smooth movement of the valve core 212 is maintained. In addition, by providing the buffer chamber 28, it is also advantageous to reduce the flow noise of the valve device 100 during operation, particularly when the fluid enters the buffer chamber 28 from the communication hole 261, since the flow area is increased, it is advantageous to reduce the flow noise.

Referring to fig. 8, as another embodiment of the buffer cavity, the width L1 of the third step portion 262 of the valve core seat 26 and the width L2 of the lower end surface of the connecting seat 251 may be equal or approximately equal, the valve core seat 26 may not include the fourth step portion 266, in this embodiment, the valve core 212 further includes a second groove portion 2120, the second groove portion 2120 is formed by being recessed inward from the outer peripheral wall of the valve core 212 along the radial direction of the valve core 212, and the height D of the second groove portion 2120 is set to be greater than the height D of the communication hole 261, so that the buffer cavity 28 is formed between the valve core 212 and the valve core seat 26 or between the valve core 212, the valve core seat 26 and the connecting seat 251, that is, the valve member 2 includes the buffer cavity 28, and the buffer cavity 28 includes a second groove cavity portion formed by the second groove portion 2120, in this embodiment, the cross section of the second groove portion 2120 is trapezoidal, but the cross section of the second groove portion 2120 may be rectangular or other shape structures. It should be noted that, when the valve element 212 and the valve port 263 are closed, the lower end boundary of the second groove portion 2120 needs to be located on the portion of the valve element 212 for abutting and sealing with the valve port 263 to ensure that the valve element 212 can close the valve port 263; when the valve element 212 moves upward in the axial direction to a maximum stroke, the upper boundary of the second groove portion 2120 needs to be located below the portion of the valve element 212 for sealing contact with the sealing ring 253 to ensure the sealing effect of the sealing ring 253 and the valve element 212.

Referring to fig. 9, the valve seat member 3 includes a mounting portion 30, a first port 31, and a second port 32, the mounting portion 30 forms a mounting cavity 33, the mounting cavity 33 can communicate the first port 31 and the second port 32, in this embodiment, the first port 31 is located on one side of the valve seat member 3, the second port 32 is located on the other side of the valve seat member 3, and an opening of the mounting cavity 33 is located on the other side of the valve seat member 3, which is beneficial to avoiding interference and improving the utilization rate of the valve seat member 3.

Referring to fig. 9 and 10, part of the valve member 2 is located in the mounting cavity 33, the valve member 2 is connected with the valve seat member 3, specifically, in the present embodiment, the connecting piece 24 further includes a flange portion 242, the mounting portion 30 includes a second side portion 301 and a fifth step portion 302, the surface of the second side portion 301 is formed with an internal thread, the valve member 2 extends into the mounting cavity 33, the flange portion 242 is abutted with the fifth step portion 302, by presetting the distance from the fifth step portion 302 to the opening of the mounting portion, the length of the valve member 2 extending into the mounting cavity 33 can be controlled, and it is ensured that the first port 31 and the second port 32 can be throttled and opened and closed through the valve port 263; the valve device 100 further includes a compression nut 4, an external thread is formed on an outer peripheral surface of the compression nut 4, the compression nut 4 is fitted around an outer periphery of the valve member 2, the compression nut 4 is rotated, the compression nut 4 is screwed to the second side portion 301, and the flange portion 242 is pressed to the fifth step portion 302, so that the connection limit between the valve member 2 and the valve seat member 3 is realized. Further, in order to prevent the fluid from leaking from the fitting gap between the valve member 2 and the mounting portion 30, a seal is provided between the valve member 2 and the mounting portion 30. In the present embodiment, referring to fig. 1, the valve device 100 further includes a pressure plate 5, the pressure plate 5 is substantially L-shaped, one portion of the pressure plate 5 is fixedly connected with the control component 1, specifically, the outer casing 11 of the control component 1, and another portion of the pressure plate 5 is fixedly connected with the valve seat component 3, specifically, the valve seat component 3 by screws, so as to realize the connection between the control component 1 and the valve seat component 3.

Referring to fig. 10, in the operation process of the valve device 100, when the first port 31 is used as an inlet of the fluid, and correspondingly the second port 32 is used as an outlet of the fluid, it is defined that the fluid flows in the forward direction, the high-pressure fluid enters the installation cavity 33 through the first port 31 and enters the buffer cavity 28 through the communication hole 261 of the valve member 2, the buffer cavity 28 is provided to facilitate the impact force of the high-pressure fluid on the valve element 212 to be relieved, and because the communication holes 261 are symmetrically arranged, the impact force between the high-pressure fluids is counteracted, so that the valve element 212 is less affected by the high-pressure fluid to enable the valve element 212 to operate smoothly, the valve element 212 forms a throttle at the valve port 263 through axial movement, and the high-pressure fluid becomes a low-pressure fluid after throttling at the valve port and flows out from.

When the second port 32 is used as an inlet of the fluid, and correspondingly the first port 31 is used as an outlet of the fluid, which is defined as the reverse flow, the high-pressure fluid flows through the mounting cavity 33 through the second port 32 and enters the second cavity 265 of the valve member 2, the high-pressure fluid in the second cavity 265 acts on the lower end surface of the spool 212, which will generate an upward pressure on the spool 212, so as to eliminate the upward pressure of the high-pressure fluid on the spool 212, so that the spool 212 can operate smoothly, referring to fig. 10 and 11, the spool assembly 21 further includes a balance passage, which includes a first balance hole 215, a first hole portion 216, and a second hole portion 217, the first balance hole 215, the first hole portion 216, and the second hole portion 217 are all located on the spool 212, the number of the first hole portion 216 and the second hole portion 217 is at least one, the valve member 2 further includes a second receiving cavity 29, the first balance hole 215 communicates the first receiving cavity 213 with the second port 32, the first hole portion 216 communicates the first balance hole 215 with the second accommodating chamber 29, the second hole portion 217 communicates the first accommodating chamber 213 with the second accommodating chamber 29, so that when high-pressure fluid enters from the second port 32, a part of the high-pressure fluid enters the first balance hole 215, the high-pressure fluid entering the first balance hole 215 enters the second accommodating chamber 29 through the first hole portion 216, another part enters the first accommodating chamber 213 and enters the second accommodating chamber 29 through the second hole portion 217 and/or the fitting clearance of the spool member 21, the high-pressure fluid in the second accommodating chamber 29 is isolated from the fluid (throttled low-pressure fluid) in the buffer chamber 28 by the seal member 25, the seal member 25 is provided to facilitate preventing the high-pressure fluid in the second accommodating chamber 29 from leaking to the buffer chamber 28, causing mixing of the high-pressure fluid and the low-pressure fluid, the high-pressure fluid in the second accommodating chamber 29 directly and/or indirectly acts on the upper end surface of the spool 212, a downward pressure is generated on the valve core 212, so that the valve core 212 is acted by the pressures of two high-pressure fluids in opposite directions, and the downward pressure acted on the valve core 212 is equal to or approximate to the upward pressure acted on the valve core 212 through the size design of the force-bearing area of the valve core, so that the pressure of the valve core 212 in the axial direction of the high-pressure fluids is balanced or tends to be balanced, the influence of the high-pressure fluids on the valve core 212 is small, and the valve core 212 can move smoothly. In addition, the second hole portion 217 is provided, so that high-pressure fluid can enter the second accommodating cavity 29 more quickly, and the pressure of the fluid on the valve core 212 can be balanced quickly, and of course, as other embodiments, the valve core assembly 21 may not include the second hole portion 217.

It should be noted that: the above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, such as the definition of the directionality of "front", "back", "left", "right", "up", "down", etc., although the present specification has described the present invention in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions and modifications without departing from the spirit and scope of the present invention can be modified or replaced by other technical solutions and modifications by those skilled in the art.

Claims (7)

1. A valve apparatus comprising a valve member including a seal assembly including a connecting seat, a seal, and a seal ring, wherein: the connecting seat comprises a first step portion, the connecting seat is provided with an assembly cavity, the sealing ring comprises a first groove portion, the sealing element is located on the periphery of the sealing ring, part of the sealing element is located in a first groove cavity formed by the first groove portion, the sealing element is abutted against the first groove portion, the sealing element has pretightening force for the first groove portion, a sealing ring assembled with the sealing element is pressed into the assembly cavity, the sealing ring is abutted against the first step portion, the sealing element is abutted against the connecting seat, and the sealing element is pressed between the sealing ring and the connecting seat.

2. The valve apparatus of claim 1, wherein: the valve component further comprises a valve core, a connecting piece and a valve core seat, the connecting seat is fixedly connected with the connecting piece, the valve core seat is integrally formed or fixedly connected with the connecting seat, the sealing ring is integrally formed in an injection molding mode, the sealing ring is provided with a through hole, the valve core penetrates through the through hole, the sealing ring is located on the periphery of the valve core, and the peripheral side wall of the through hole is in sealing contact with the peripheral wall of the valve core.

3. The valve apparatus of claim 2, wherein: the connecting seat still includes first weld part and second step portion, the connecting piece with second step portion butt, the connecting seat passes through first weld part with connecting piece welded fastening, the height of first weld part is less than the height of sealing ring, the width of first weld part is less than the width of second step portion.

4. A valve arrangement according to claim 3, wherein: the height (H) of the first welding portion is 0.4-0.8 times of the height (H) of the sealing ring, and the width (W) of the first welding portion is 0.3-0.5 times of the width (W) of the second step portion.

5. The valve device according to any one of claims 2 to 4, wherein: the valve device further comprises a valve seat component, the valve seat component comprises a mounting cavity, a first port and a second port, the valve device is provided with a valve port, part of the valve component is located in the mounting cavity, the valve component is connected with the valve seat component, and the first port and the second port can be communicated through the valve port.

6. The valve apparatus of claim 5, wherein: the valve member further includes a communication hole, the valve member having a buffer chamber with a height greater than that of the communication hole, the communication hole communicating the buffer chamber and the first port, the communication hole being symmetrically disposed.

7. The valve apparatus of claim 6, wherein: the valve component is also provided with a first accommodating cavity and a second accommodating cavity, the valve core comprises a first balance hole, a first hole part and a second hole part, the first balance hole is communicated with the second port and the first accommodating cavity, the first hole part is communicated with the first balance hole and the second accommodating cavity, the second hole part is communicated with the first accommodating cavity and the second accommodating cavity, and the sealing element and the sealing ring are used for sealing and isolating the second accommodating cavity and the buffer cavity.

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