CN216895776U - Large-flow leakage-free unloading valve - Google Patents
Large-flow leakage-free unloading valve Download PDFInfo
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- CN216895776U CN216895776U CN202122403840.0U CN202122403840U CN216895776U CN 216895776 U CN216895776 U CN 216895776U CN 202122403840 U CN202122403840 U CN 202122403840U CN 216895776 U CN216895776 U CN 216895776U
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Abstract
The utility model discloses a large-flow leakage-free unloading valve which comprises a main valve body, a main valve sleeve arranged in the main valve body, a main valve core arranged in the main valve sleeve, a cover plate arranged on the upper part of the main valve body and a solenoid valve assembly, wherein the main valve sleeve is provided with a valve body; when the electromagnetic valve component is in power failure, the electromagnetic valve is positioned in a first direction, hydraulic pressure of hydraulic oil flows through the main valve body, the main valve body is sleeved on the upper end face of the main valve core, and at the moment, the main valve core moves to the first direction and is tightly pressed on the main valve sleeve to form hard sealing without leakage; a Glare ring is arranged between the main valve sleeve and the outer circle of the main valve core to block oil leakage, so that the pressure of a working area is kept unchanged, and at the moment, the unloading valve is in a pressure maintaining state; when the electromagnet of the electromagnetic valve component is electrified, the electromagnetic valve component moves to a second position, and hydraulic oil in the main valve sleeve flows to the oil tank through the cover plate and the main valve body; at the moment, the main valve core moves in a second direction, the main valve core is opened, hydraulic oil returns to the oil tank through the main valve core and the main valve sleeve, the pressure of a working area is released, and at the moment, the unloading valve is in an unloading state.
Description
Technical Field
The utility model relates to the technical field of machine manufacturing, in particular to a large-flow leakage-free unloading valve.
Background
In a hydraulic system, an unloading valve is used, when the oil cylinder is not required to be loaded, hydraulic oil output by a hydraulic pump or hydraulic oil in the oil cylinder can be directly released to an oil tank, when the oil cylinder is required to be loaded, the hydraulic pump needs to continuously output the hydraulic oil to keep the loading pressure of the oil cylinder, and therefore when the loading process is long, consumed energy is large. The small-drift-diameter unloading valve with the one-way valve can realize that the pump is stopped and the pressure is maintained by the one-way valve for loading, but the flow rate is small, the large-flow occasion is not suitable, and the applicability is low.
Therefore, how to improve the applicability of the unloading valve is a problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a large-flow leakage-free unloading valve, which aims to solve the technical problem of low applicability of the existing unloading valve, and the large-flow leakage-free unloading valve is a one-way valve with a two-way structure formed by a main valve sleeve with a large through diameter and a main valve core with a GRILL (Glare circle) outer diameter, is large in through flow, applicable to large-flow occasions, high in applicability and capable of well overcoming the problems in the prior art.
In order to achieve the aim, the large-flow leakage-free unloading valve provided by the utility model comprises a main valve body, a main valve sleeve, a main valve core, a cover plate and a solenoid valve assembly; the main valve sleeve is arranged in the main valve body, and the main valve core is movably arranged in the main valve sleeve; the cover plate is arranged on the top surface of the main valve body; the electromagnetic valve assembly is arranged above the cover plate;
connecting the main valve body with the working area and the oil tank; when the electromagnetic valve component is in power failure, the electromagnetic valve component is located at a first position, hydraulic pressure of hydraulic oil flows through the main valve body, the main valve body is sleeved to the upper end face of the main valve core, and the main valve core moves to the first position and is tightly pressed on the main valve sleeve to form hard sealing without leakage; a Glare ring is arranged between the main valve sleeve and the outer circle of the main valve core to block oil leakage, so that an oil port on the main valve body is ensured to be free of leakage, the pressure of a working area is kept unchanged, and the unloading valve is in a pressure maintaining state;
when the electromagnet of the electromagnetic valve component is electrified, the electromagnetic valve component moves to a second position, and hydraulic oil in the main valve sleeve flows to the oil tank through the cover plate and the main valve body; at the moment, hydraulic pressure is not applied to the upper end face of the main valve core, the main valve core moves in a second direction, the main valve core is opened, hydraulic oil returns to the oil tank through the main valve core and the main valve sleeve, the pressure of a working area is released, and the unloading valve is in an unloading state.
Furthermore, the main valve body is provided with an oil inlet, a first oil inlet hole, a main valve hole, an oil outlet, a control oil inlet hole and a control oil return hole; the control oil inlet hole is communicated with the first oil inlet hole, and the oil inlet is connected with the working area; the oil return control hole is communicated with an oil outlet, and the oil outlet is connected with an oil tank.
Furthermore, the main valve sleeve is provided with a second oil inlet hole, a taper hole, an oil outlet hole and a main valve sleeve inner hole; a first sealing ring is arranged on the excircle of the lower end of the main valve sleeve, a second sealing ring is arranged on the excircle of the upper end of the main valve sleeve, and a third sealing ring is arranged at the junction of the upper end surface and the excircle; the first sealing ring, the second sealing ring and the third sealing ring are arranged on the main valve sleeve and are integrally installed in the main valve hole of the valve body.
Furthermore, a main valve core is arranged in the main valve sleeve; the main valve core can move in the main valve sleeve; the main valve core is provided with an outer cone and a spring hole, and the outer circle is provided with a groove and a GREEN ring; the outer cone is matched and contacted with the taper hole on the main valve sleeve to form a non-leakage hard seal; a spring is arranged in the spring hole, and the main valve core can move by overcoming the compression force of the spring.
Furthermore, the Gray ring is composed of an O-shaped ring and a sliding ring; the inner ring of the O-shaped ring is matched with the bottom of the groove on the excircle of the main valve sleeve to form static seal without leakage, and the outer ring of the O-shaped ring is matched with the inner ring of the sliding ring to form static seal without leakage; the slip ring outer ring and the main valve sleeve inner hole are matched with each other to form a dynamic seal without leakage.
Further, the cover plate is arranged on the top surface of the main valve body; the cover plate is provided with a first inclined hole, a first process hole, a pilot oil return hole, a second inclined hole, a third inclined hole, a second process hole, a pilot oil inlet hole, a pilot oil outlet hole, a first plug, a second plug and a damper; the first inclined hole arranged at the bottom of the cover plate is communicated with the control oil return hole on the main valve body; the second inclined hole is communicated with an oil inlet on the main valve body; the third inclined hole is communicated with the inner hole of the main valve sleeve through a spring hole on the main valve core positioned on the bottom surface; the pilot oil return hole is communicated with the first inclined hole through a first process hole; the pilot oil inlet is communicated with the second inclined hole through a second process hole; the pilot oil outlet is communicated with the third inclined hole; the first fabrication hole is blocked by the screw degree; the damper is arranged at the orifice of the pilot oil outlet hole.
Furthermore, the electromagnetic valve assembly is arranged on the cover plate and consists of a valve body assembly, a first oil inlet cavity, an oil return cavity, an oil outlet cavity, a second oil inlet cavity, a valve core assembly, a spring assembly, an electromagnet and a push rod; the electromagnet is connected with the valve body assembly; the first oil inlet cavity, the oil return cavity, the oil outlet cavity and the second oil inlet cavity are respectively arranged on the valve body assembly; a main hole is formed in the middle of the valve body assembly, and a valve core assembly is arranged in the main hole; the valve core assembly is sleeved with a spring assembly, one end of the valve core assembly is provided with a push rod, and the push rod can push the valve core assembly to overcome spring force to move.
Furthermore, when the electromagnet is powered off, the valve core assembly stays at the first position under the action of the compression force of the spring assembly, and at the moment, the second oil inlet cavity is communicated with the oil outlet cavity; when the electromagnet is electrified, the push rod is driven to push the valve core assembly to move to the second position by overcoming the compression force of the spring assembly, and at the moment, the oil outlet cavity is communicated with the oil return cavity.
The large-flow leakage-free unloading valve provided by the utility model has the advantages that the main valve sleeve with large drift diameter and the main valve core with the outer diameter provided with the GREEN ring form the one-way valve with the two-way structure, the through flow is large, and the large-flow leakage-free unloading valve can be suitable for large-flow occasions; and a cover plate and a non-leakage electromagnetic valve are matched, so that the non-leakage pressure maintaining and unloading functions of the whole valve can be realized.
Drawings
The utility model is further described below in conjunction with the appended drawings and the detailed description.
Fig. 1 is a structural schematic diagram of the large-flow non-leakage unloading valve.
The following are labeled descriptions of the components in the drawings:
100. main valve body 101, oil inlet 102, first oil inlet hole 103, main valve hole 104, oil outlet hole 105, control oil inlet hole 106 and control oil return hole
200. The main valve cover 201, the second oil inlet hole 202, the taper hole 203, the oil outlet hole 204, the main valve cover inner hole 210, the main valve core 211, the outer cone 212, the spring hole 220, the spring 231, the first sealing ring 232, the second sealing ring 233, the third sealing ring 240 and the Gray ring
300. Cover plate 301, first inclined hole 302, first process hole 303, pilot oil return hole 304, second inclined hole 305, third inclined hole 306, second process hole 307, pilot oil inlet hole 308, pilot oil outlet hole 310, first plug 320, second plug 330 and damper
400. The solenoid valve assembly 410, the valve body assembly 411, the first oil inlet cavity 412, the oil return cavity 413, the oil outlet cavity 414, the second oil inlet cavity 420, the valve core assembly 430, the spring assembly 440, the electromagnet 441 and the push rod.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further explained below by combining the specific drawings.
Aiming at the technical problems that the existing unloading valve is not suitable for large-flow occasions and low in applicability, based on the technical problem, the scheme provides the large-flow leakage-free unloading valve, a main valve sleeve with a large drift diameter and a main valve core with a Glay circle on the outer diameter form a one-way valve with a two-way structure, the flow is large, and the large-flow leakage-free unloading valve is suitable for large-flow occasions; and a cover plate and a non-leakage electromagnetic valve are matched, so that the non-leakage pressure maintaining and unloading functions of the whole valve can be realized.
The large-flow non-leakage unloading valve provided by the scheme is shown in fig. 1 and comprises a main valve body 100, a main valve sleeve 200, a main valve core 210, a cover plate 300 and a solenoid valve assembly 400.
Specifically, the main valve body is provided with an oil inlet 101, a first oil inlet hole 102, a main valve hole 103, an oil outlet 104, a control oil inlet hole 105 and a control oil return hole 106; the control oil inlet 105 is communicated with the first oil inlet 102, and the oil inlet 101 is used for connecting a working area; the control oil return hole 106 is communicated with the oil outlet 104, and the oil outlet 104 is connected with an oil tank.
The main valve sleeve 200 is provided with a second oil inlet hole 201, a taper hole 202, an oil outlet hole 203 and a main valve sleeve inner hole 204; meanwhile, a first sealing ring 231 is arranged on the excircle of the lower end of the main valve sleeve 200, a second sealing ring 232 is arranged on the excircle of the upper end, and a third sealing ring 233 is arranged at the junction of the upper end surface and the excircle; the first, second, and third seal rings 231, 232, and 233 are provided on the main valve housing 200 and are integrally fitted into the main valve hole 103 of the main valve body.
A main valve core 210 is arranged in the main valve sleeve 200, and the main valve core 210 can move in the main valve sleeve 200; the main valve core 210 is provided with an outer cone 211 and a spring hole 212; the outer circle is provided with a groove and a GREEN 240 is arranged on the groove.
Wherein, the outer cone 211 is matched and contacted with the taper hole 202 on the main valve sleeve to form a non-leakage hard seal; a spring 220 is disposed in the spring bore 212, and the main poppet 210 is movable against the compression of the spring 220.
Further, the Glare ring 240 is composed of an O-shaped ring and a sliding ring; the inner ring of the O-shaped ring is matched with the bottom of the groove on the excircle of the main valve sleeve 200 to form static seal without leakage, and the outer ring of the O-shaped ring is matched with the inner ring of the sliding ring to form static seal without leakage; the slip ring outer ring and the main valve sleeve inner hole 204 are mutually matched to form dynamic seal without leakage.
And the sliding ring has small frictional resistance and wear resistance, thereby ensuring the flexible movement of the main valve core 210 without leakage and having long service life.
The cover plate 300 is installed on the top surface of the main valve body 100, and the cover plate 300 is provided with a first inclined hole 301, a first fabrication hole 302, a pilot oil return hole 303, a second inclined hole 304, a third inclined hole 305, a second fabrication hole 306, a pilot oil inlet 307, a pilot oil outlet 308, a first plug 310, a second plug 320 and a damper 330.
A first inclined hole 301 arranged at the bottom of the cover plate 300 is communicated with a control oil return hole 106 on the main valve body 100; the second inclined hole 304 is communicated with the oil inlet 101 on the main valve body; the third angled bore 305 communicates with the main valve housing bore 204 through a spring bore 212 in the bottom main valve spool.
The pilot oil return hole 303 is communicated with the first inclined hole 301 through a first process hole 302; the pilot oil inlet hole 307 is communicated with the second inclined hole 304 through a second process hole 306; the pilot oil outlet 308 communicates with the third slant hole 305.
The first plug 310 plugs the first process hole 302, and the second plug 320 plugs the second process hole 306, so as to prevent the hydraulic oil from leaking; the damper 330 is installed at the orifice of the pilot oil outlet 308.
It should be noted that the size of the damping hole can be selected to control the hydraulic flow entering and exiting the main valve sleeve inner hole 204, so as to prevent the main valve element 210 from being opened and closed too fast due to too large flow and causing impact.
The solenoid valve assembly 400 is disposed on the cover plate 300, and comprises a valve body assembly 410, a first oil inlet chamber 411, an oil return chamber 412, an oil outlet chamber 413, a second oil inlet chamber 414, a valve core assembly 420, a spring assembly 430, an electromagnet 440, and a push rod 441.
Wherein the electromagnet 440 is connected with the valve body assembly 410; the first oil inlet cavity 411, the oil return cavity 412, the oil outlet cavity 413 and the second oil inlet cavity 414 are respectively arranged on the valve body assembly 410; a main hole is formed in the middle of the valve body assembly 410, and a valve core assembly 420 is arranged in the main hole; the valve core assembly 420 is sleeved with a spring assembly 430, one end of the valve core assembly is provided with a push rod 441, and the push rod 441 can push the valve core assembly 420 to move by overcoming the spring force.
When the electromagnet 440 loses power, the valve core assembly 420 stays at the left position under the action of the compression force of the spring assembly 430, and at the moment, the second oil inlet cavity 414 is communicated with the oil outlet cavity 413; when the electromagnet 440 is energized, the push rod 441 is driven to push the valve element assembly 420 to move to the right position against the compression force of the spring assembly 430, and at this time, the oil outlet chamber 413 is communicated with the oil return chamber 412.
The working process of the scheme in use is illustrated below; it should be noted that the following description is only a specific application example of the present solution and is not intended to limit the present solution.
The following describes the specific operation of the relief valve in the pressure holding state and the unloading state:
and (3) pressure maintaining state:
when the electromagnet 440 of the solenoid valve assembly 400 is de-energized, the valve core assembly 420 stays at the left position under the compressive force of the spring assembly 430, and at this time, the second oil inlet chamber 414 is communicated with the oil outlet chamber 413.
The oil inlet 101 is connected with the working area, and the oil outlet 104 is connected with the oil tank. After the working area is pressurized to the specified pressure by the hydraulic pump, the hydraulic pump stops working, and other hydraulic valves are arranged between the working area and the hydraulic pump for leakage-free isolation, so that the situation that the pressure of the working area is lost due to the fact that hydraulic oil cannot leak and flow backwards through the hydraulic pump is guaranteed.
The hydraulic oil of workspace divides into two at oil inlet 101: one path passes through the first oil inlet hole 102 and the second oil inlet hole 201, and at the moment, hydraulic pressure acts on the lower end face of the main valve element 210; the other path passes through the control oil inlet hole 105, the second inclined hole 304, the second fabrication hole 306, the pilot oil inlet hole 307 and the internal flow passage of the valve body assembly 410 to reach a first oil inlet chamber 411 and a second oil inlet chamber 414.
The hydraulic oil enters the oil outlet chamber 413 from the second oil inlet chamber 414, and passes through the damper, the pilot oil outlet hole 308, the third slant hole 305 to the main valve housing inner hole 204, at which time the hydraulic pressure acts on the upper end surface of the main valve element 210.
Since the area of the upper end surface of the main spool 210 is larger than that of the lower end surface, the total thrust generated by hydraulic pressure, the downward force is larger than the upward force, so that the outer cone 211 of the main spool 210 is pressed against the conical hole 202 of the main spool cover 200, where the hard seal is not leaked.
In addition, a gap is reserved between the outer circles of the main valve core 210 of the main valve sleeve inner hole 204, oil can be mixed, but the oil leakage is blocked under the action of the GREEN 240, so that no leakage exists between the oil inlet 101 and the oil outlet 104, and the pressure of a working area is kept unchanged.
An unloading state:
when the electromagnet 440 of the solenoid valve assembly 400 is energized, the push rod is driven to push the valve element assembly to move to the right position against the compression force of the spring assembly, and at this time, the oil outlet chamber 413 is communicated with the oil return chamber 412.
Hydraulic oil in the inner hole 204 of the main valve sleeve passes through the third inclined hole 305, the pilot oil outlet hole 308, the damper 330, the oil outlet cavity 413, the oil return cavity 412, the pilot oil return hole 303, the first fabrication hole 302, the first inclined hole 301, the control oil return hole 106 and the oil outlet 104 to reach an oil tank; at this time, no pressure exists on the upper end surface of the main valve element 210, the force acting on the lower end surface of the main valve element 210 overcomes the compression force of the spring 220, so that the main valve element 210 moves upwards, the outer cone 211 is lifted away from the cone hole 202, the main valve element 210 is opened, the hydraulic oil returns to the oil tank through the oil outlet hole 203 and the oil outlet 104, and the pressure in the working area is released and is in an unloading state.
The large-flow non-leakage unloading valve formed by the scheme has a compact structure; the main valve sleeve with large drift diameter and the main valve core with the outer diameter provided with the GREEN form the one-way valve with the two-way structure, the flow rate is large, and the one-way valve can be suitable for large-flow occasions; and a cover plate and a non-leakage electromagnetic valve are matched, so that the non-leakage pressure maintaining and unloading functions of the whole valve can be realized.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (8)
1. A large-flow non-leakage unloading valve is characterized by comprising a main valve body, a main valve sleeve, a main valve core, a cover plate and a solenoid valve assembly; the main valve sleeve is arranged in the main valve body, and the main valve core is movably arranged in the main valve sleeve; the cover plate is arranged on the top surface of the main valve body; the electromagnetic valve assembly is arranged above the cover plate;
connecting the main valve body with the working area and the oil tank; when the electromagnetic valve component is in power failure, the electromagnetic valve component is located at a first position, hydraulic pressure of hydraulic oil flows through the main valve body, the main valve body is sleeved to the upper end face of the main valve core, and the main valve core moves to the first position and is tightly pressed on the main valve sleeve to form hard sealing without leakage; a Glare ring is arranged between the main valve sleeve and the outer circle of the main valve core to block oil leakage, so that no leakage of an oil port on the main valve body is ensured, the pressure of a working area is kept unchanged, and the unloading valve is in a pressure maintaining state;
when the electromagnet of the electromagnetic valve component is electrified, the electromagnetic valve component moves to a second position, and hydraulic oil in the main valve sleeve flows to the oil tank through the cover plate and the main valve body; at the moment, hydraulic pressure is not applied to the upper end face of the main valve core, the main valve core moves in a second direction, the main valve core is opened, hydraulic oil returns to the oil tank through the main valve core and the main valve sleeve, the pressure of a working area is released, and the unloading valve is in an unloading state.
2. The high-flow no-leakage unloading valve according to claim 1, wherein the main valve body is provided with an oil inlet, a first oil inlet hole, a main valve hole, an oil outlet, a control oil inlet hole and a control oil return hole; the control oil inlet hole is communicated with the first oil inlet hole, and the oil inlet is connected with the working area; the oil return control hole is communicated with an oil outlet, and the oil outlet is connected with an oil tank.
3. The high-flow non-leakage unloading valve according to claim 1, wherein the main valve sleeve is provided with a second oil inlet hole, a taper hole, an oil outlet hole and a main valve sleeve inner hole; a first sealing ring is arranged on the excircle of the lower end of the main valve sleeve, a second sealing ring is arranged on the excircle of the upper end of the main valve sleeve, and a third sealing ring is arranged at the junction of the upper end surface and the excircle; the first sealing ring, the second sealing ring and the third sealing ring are arranged on the main valve sleeve and are integrally installed in the main valve hole of the valve body.
4. A high flow rate no leakage unloader valve according to claim 1 wherein a main spool is provided inside the main spool housing; the main valve core can move in the main valve sleeve; the main valve core is provided with an outer cone and a spring hole, and the outer circle is provided with a groove and a GREEN ring; the outer cone is matched and contacted with the taper hole on the main valve sleeve to form a non-leakage hard seal; a spring is arranged in the spring hole, and the main valve core can move by overcoming the compression force of the spring.
5. The high-flow no-leakage unloading valve according to claim 4, wherein the Gray ring is composed of two parts, namely an O-ring and a sliding ring; the inner ring of the O-shaped ring is matched with the bottom of the groove on the excircle of the main valve sleeve to form static seal without leakage, and the outer ring of the O-shaped ring is matched with the inner ring of the sliding ring to form static seal without leakage; the sliding ring outer ring and the main valve sleeve inner hole are mutually matched to form dynamic seal without leakage.
6. The high flow no-leakage unloader valve of claim 1, wherein the cover plate is mounted on a top surface of the main valve body; the cover plate is provided with a first inclined hole, a first process hole, a pilot oil return hole, a second inclined hole, a third inclined hole, a second process hole, a pilot oil inlet hole, a pilot oil outlet hole, a first plug, a second plug and a damper; the first inclined hole arranged at the bottom of the cover plate is communicated with the control oil return hole on the main valve body; the second inclined hole is communicated with an oil inlet on the main valve body; the third inclined hole is communicated with the inner hole of the main valve sleeve through a spring hole on the main valve core positioned on the bottom surface; the pilot oil return hole is communicated with the first inclined hole through a first process hole; the pilot oil inlet is communicated with the second inclined hole through a second process hole; the pilot oil outlet is communicated with the third inclined hole; the first plug blocks the first fabrication hole; the damper is arranged at the orifice of the pilot oil outlet hole.
7. The large-flow leakage-free unloading valve according to claim 1, wherein the solenoid valve assembly is arranged on the cover plate and comprises a valve body assembly, a first oil inlet cavity, an oil return cavity, an oil outlet cavity, a second oil inlet cavity, a valve core assembly, a spring assembly, an electromagnet and a push rod; the electromagnet is connected with the valve body assembly; the first oil inlet cavity, the oil return cavity, the oil outlet cavity and the second oil inlet cavity are respectively arranged on the valve body assembly; a main hole is formed in the middle of the valve body assembly, and a valve core assembly is arranged inside the main hole; the valve core assembly is sleeved with a spring assembly, one end of the valve core assembly is provided with a push rod, and the push rod can push the valve core assembly to overcome spring force to move.
8. The large-flow no-leakage unloading valve according to claim 7, wherein when the electromagnet is de-energized, the valve core assembly stays at the first position under the compressive force of the spring assembly, and at this time, the second oil inlet cavity is communicated with the oil outlet cavity; when the electromagnet is electrified, the push rod is driven to push the valve element assembly to move to the second position by overcoming the compression force of the spring assembly, and at the moment, the oil outlet cavity is communicated with the oil return cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122403840.0U CN216895776U (en) | 2021-09-30 | 2021-09-30 | Large-flow leakage-free unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122403840.0U CN216895776U (en) | 2021-09-30 | 2021-09-30 | Large-flow leakage-free unloading valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216895776U true CN216895776U (en) | 2022-07-05 |
Family
ID=82194545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122403840.0U Active CN216895776U (en) | 2021-09-30 | 2021-09-30 | Large-flow leakage-free unloading valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216895776U (en) |
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2021
- 2021-09-30 CN CN202122403840.0U patent/CN216895776U/en active Active
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