CN108591558B - Pressure reducing valve - Google Patents
Pressure reducing valve Download PDFInfo
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- CN108591558B CN108591558B CN201810402491.0A CN201810402491A CN108591558B CN 108591558 B CN108591558 B CN 108591558B CN 201810402491 A CN201810402491 A CN 201810402491A CN 108591558 B CN108591558 B CN 108591558B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention relates to a pressure reducing valve which comprises a valve body with a high-pressure cavity and a low-pressure cavity, wherein a valve seat, a valve core and an ejector rod in abutting fit with the valve core are arranged in the valve body, a throttling opening is formed in the valve seat, a valve seat hole for communicating the throttling opening with the low-pressure cavity is further formed in the valve seat, fluid flowing through the throttling opening enters the low-pressure cavity through the valve seat hole, and the ejector rod is inserted in the valve seat hole. The valve seat hole not only supplies to insert with case roof pressure complex ejector pin, still can supply to get into the low-pressure chamber through the fluid behind the choke decompression, only need process out the valve seat hole that supplies ejector pin male on the disk seat like this, can introduce the low-pressure chamber with the fluid that flows through the choke, need not process a plurality of runners that move about freely and quickly alternately on the disk seat, not only make things convenient for the processing of disk seat, and the reduction of runner has also increased the overall structure intensity of disk seat, the problem that the processing of the disk seat that exists is complicated and structural strength is low among the prior art has been solved.
Description
Technical Field
The present invention relates to a pressure reducing valve.
Background
The pressure reducing valve is a special device for automatically reducing the working pressure of a pipeline, and can reduce a medium with higher pressure to a set pressure after a given pressure reducing range is given. Because the high-pressure gas is output from the gas cylinder, the gas cylinder cannot be directly used when low-pressure gas is needed, and the high-pressure gas needs to be decompressed, the decompression valve is widely applied to various fields.
The chinese patent that the publication number of authorizing is CN204176068U, the publication date is 2015.02.25 discloses a multistage high-pressure pilot-operated gas pressure reducer, the multistage high-pressure pilot-operated gas pressure reducer includes the casing, the first handle that is used for adjusting is installed on casing one side upper portion, the first pressure regulating spring of downside installation of first handle, the casing inboard is located first pressure regulating spring lower part installation diaphragm, the lower part installation ejector pin of diaphragm, the casing inboard is located ejector pin department and sets up the low-pressure chamber, the low-pressure chamber is for supplying the low-pressure chamber that the low-pressure fluid flows through. The inner side of the shell is positioned at the lower part of the ejector rod and is provided with a first valve seat, and the inner side of the first valve seat is provided with a first valve core. The lower part of the shell is positioned between the first valve core and the second valve core and is provided with a vent groove, one side of the lower part of the shell, which is positioned on the second valve core, is provided with a secondary outlet end, and the secondary outlet end is communicated with the second valve core. When the push rod pushes the valve core to move downwards to leave the valve seat sealing surface to a certain opening height, the high-pressure fluid passes through the high-pressure cavity and then loses a part of energy through the throttling opening between the first valve core and the first valve seat sealing surface, the pressure of the gas is reduced, and the purpose of reducing the pressure is achieved. The first valve seat is provided with a plurality of flow channels for the low-pressure fluid flowing through the throttling port to flow into the low-pressure cavity, on one hand, the processing complexity of the valve seat is increased due to the processing of the flow channels; on the other hand, machining a plurality of flow passages on the valve seat also reduces the structural strength of the valve seat, reducing the service life of the valve seat.
Disclosure of Invention
The invention aims to provide a pressure reducing valve, which solves the problems of complex processing and low structural strength of a valve seat in the prior art.
The pressure reducing valve adopts the following technical scheme:
the relief pressure valve is equipped with disk seat, case and with case roof pressure complex ejector pin including the valve body that has high-pressure chamber and low-pressure chamber in the valve body, be equipped with the throttle mouth on the disk seat, still be equipped with the disk seat hole of intercommunication throttle mouth and low-pressure chamber on the disk seat, the fluid that flows through from the throttle mouth passes through the disk seat hole and gets into the low-pressure chamber, the ejector pin cartridge is downthehole at the disk seat.
In order to prevent the ejector rod from jacking and pressing the end face of the valve seat and prevent fluid from flowing into the low-pressure cavity, the end part, far away from the throttling port, of the valve seat is provided with a communicating groove for communicating the valve seat hole with the low-pressure cavity. When the ejector rod is pressed against the end face of the valve seat, fluid can flow into the low-pressure cavity through the communicating groove.
In order to avoid the throttling phenomenon of fluid between the ejector rod and the valve seat, in the scheme, the end part, far away from the throttling port, of the valve seat hole is provided with a flaring structure, and the communicating groove is communicated with the flaring structure. The flow area between the ejector rod and the valve seat is increased through the flaring structure, the throttling phenomenon of the fluid after pressure reduction between the ejector rod and the valve seat is prevented, and the communicating groove is communicated with the flaring structure to facilitate the processing of the communicating groove and the flaring structure.
For the convenience carries out radial positioning to the case, in this scheme the disk seat hole includes path section and big footpath section, and the choke setting is kept away from the one end of big footpath section in the path section, the case cartridge is in the path section, and ejector pin and case are in big footpath section top press fit. On one hand, the small diameter section reduces the gap between the valve core and the valve seat, and can play a good role in radially positioning the valve core; on the other hand, when the fluid passing through the orifice passes through the gap between the small diameter section and the valve core, partial pressure is lost, so that the fluid pressure is further reduced, and the fluid reaches the set pressure.
In order to increase the sealing performance between the valve core and the throttling opening in a non-working state, the throttling opening is a conical flaring, an annular conical surface matched with the conical flaring is arranged on the valve core, the throttling opening is closed when the annular conical surface is pressed against the conical flaring, and the throttling opening is opened when the annular conical surface is separated from the conical flaring under the action of the jacking force of the ejector rod. Under the non-working state, the valve core and the throttling opening are matched by adopting an annular conical surface and a conical flaring, so that the sealing property of the valve core to the throttling opening can be improved, and the service life of a product is prolonged.
For the leakproofness of case and disk seat under the increase non-operating condition, in this scheme the disk seat includes base and compact heap, press from both sides between compact heap and the base and be equipped with the sealing member that is used for sealed throttle mouthful when the throttle mouth is closed, compact heap screw-thread assembly is in the valve body. The pressing block is assembled in the valve body in a threaded mode, the sealing element is convenient to replace when the sealing element fails, the sealing effect of the valve seat and the valve core is guaranteed, and the service life of a product is prolonged.
In order to increase the application range of the pressure reducing valve, the pressure reducing valve is a two-stage pressure reducing valve comprising a high-pressure reducing part and a low-pressure reducing part, a fluid inlet for a fluid to enter the valve body and a fluid outlet for the fluid to flow out of the valve body are respectively communicated with a high-pressure cavity of the high-pressure reducing part and a low-pressure cavity of the low-pressure reducing part, the low-pressure cavity of the high-pressure reducing part is communicated with the high-pressure cavity of the low-pressure reducing part so that the fluid decompressed by the high-pressure reducing part flows into the low-pressure reducing part to be subjected to secondary pressure reduction, an adjusting rod of the high-pressure reducing part and an adjusting rod of the low-pressure reducing part are respectively arranged at two. On one hand, the fluid can be subjected to two-stage pressure reduction through the communicated high-pressure reduction part and the low-pressure reduction part, so that the pressure span of an inlet and an outlet of the pressure reducing valve is increased, and the application range of the pressure reducing valve is enlarged; on the other hand, the arrangement mode of the high-pressure reducing part and the low-pressure reducing part facilitates the processing of the valve body.
In consideration of the difference of the elastic force between the elastic pressure regulating parts on the high-pressure reducing part and the low-pressure reducing part, the elastic pressure regulating part of the high-pressure reducing part is a disc spring, and the elastic pressure regulating part of the low-pressure reducing part is a spring. Due to the structural characteristics of the disc spring and the spring, the elastic pressure regulating parts of the high-pressure reducing part and the low-pressure reducing part respectively adopt the disc spring and the spring to meet the stress requirements of each part respectively.
In order to ensure the stability of the jacking force of the ejector rod acting on the valve core, the valve core in the scheme is provided with a spherical surface, the ejector rod is provided with a plane, and the valve core and the ejector rod are in jacking fit with the plane through the spherical surface. Through spherical surface and planar cooperation, conveniently realize the automatic alignment of ejector pin and case, guarantee the stability of the jacking force of applying on the case.
In order to avoid inaccurate pressure of an outlet of the pressure reducing valve caused by rotation of the adjusting rod when the pressure reducing valve works, the valve body is provided with a locking nut used for locking the adjusting rod for adjusting the compression amount of the pressure regulating elastic part on the valve body. The adjusting rod is locked on the valve body through the locking nut, so that the rotation of the adjusting rod during the work of the pressure reducing valve can be avoided, and the outlet pressure of the valve body is ensured to be the set pressure.
The invention has the beneficial effects that: the valve seat hole not only supplies to insert with case roof pressure complex ejector pin, still can supply to get into the low-pressure chamber through the fluid behind the choke decompression, only need process out the valve seat hole that supplies ejector pin male on the disk seat like this, can introduce the low-pressure chamber with the fluid that flows through the choke, need not process a plurality of runners that move about freely and quickly alternately on the disk seat, not only make things convenient for the processing of disk seat, and the reduction of runner has also increased the overall structure intensity of disk seat, the problem that the processing of the disk seat that exists is complicated and structural strength is low among the prior art has been solved.
Drawings
FIG. 1 is a cross-sectional view of a front view of a particular embodiment 1 of the pressure relief valve of the present invention;
FIG. 2 is a cross-sectional view of the left side view of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
in the figure: 1-a low-pressure reducing part, 2-an outlet aluminum gasket, 3-an outlet joint, 4-a valve core spring, 5-a base, 6-a sealing ring, 7-a valve core, 8-a sealing element, 9-a pressing block, 10-a mandril, 11-an inlet joint, 12-a low-pressure cavity, 13-a stopper, 14-a valve core spring seat, 15-a disc spring seat, 16-a high-pressure reducing part, 17-an adjusting rod, 18-a locking nut, 19-a conical flaring, 20-an annular conical surface, 21-a spring, 22-an inlet aluminum gasket, 23-a plug, 24-a large-diameter section, 25-a small-diameter section, 26-a high-pressure membrane, 27-a spring disc, 28-a steel ball, 29-a flaring structure and 30-a communication groove.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the specific embodiment of the pressure reducing valve of the present invention, as shown in fig. 1 to 3, the pressure reducing valve includes a valve body having a high pressure chamber and a low pressure chamber 12, a valve seat, a valve core 7 and a push rod 10 in press fit with the valve core 7 are disposed in the valve body, the valve seat is further provided with a throttling orifice and a valve seat hole for communicating the throttling orifice with the low pressure chamber 12, a fluid flowing through the throttling orifice enters the low pressure chamber 12 through the valve seat hole, and the push rod 10 is inserted into the valve seat hole. The valve seat hole not only supplies ejector pin 10 to insert, still can supply the fluid entering low-pressure chamber 12 after the choke decompression, only need process out the valve seat hole that supplies ejector pin male on the disk seat like this, can introduce low-pressure chamber 12 with the fluid that flows through the choke, need not process a plurality of runners that move about freely and quickly alternately on the disk seat, not only make things convenient for the processing of disk seat, and the reduction of runner has also increased the overall structure intensity of disk seat, the problem that the processing of disk seat that exists is complicated and structural strength is low among the prior art has been solved.
As shown in fig. 1 and 2, to increase the range of use of the pressure reducing valve, the pressure reducing valve in this embodiment is a two-stage pressure reducing valve including a high pressure reducing portion 16 and a low pressure reducing portion 1, a fluid inlet on the valve body through which a fluid enters the valve body and a fluid outlet through which the fluid exits the valve body are respectively communicated with a high pressure chamber of the high pressure reducing portion 16 and a low pressure chamber 12 of the low pressure reducing portion 1, and the low pressure chamber of the high pressure reducing portion 16 is communicated with the high pressure chamber of the low pressure reducing portion 1 so that the fluid decompressed by the high pressure reducing portion 16 flows into the low pressure reducing portion 1 to be subjected to secondary decompression. The regulation rod 17 of the high-pressure reducing portion 16 and the regulation rod of the low-pressure reducing portion 1 are respectively arranged at two opposite ends of the valve body, and the regulation rod 17 of the high-pressure reducing portion 16 and the regulation rod of the low-pressure reducing portion 1 are coaxially disposed. On one hand, the fluid can be decompressed in two stages through the communicated high-pressure decompression part 16 and the low-pressure decompression part 1, so that the span of the pressure at the inlet and the outlet of the decompression valve is increased, and the application range of the decompression valve is enlarged; on the other hand, the high-pressure reducing portion 16 and the low-pressure reducing portion 1 are arranged in such a manner as to facilitate the valve body processing. In other embodiments, the pressure relief valve may include only a high pressure relief portion or a low pressure relief portion; the high-pressure relief portion and the low-pressure relief portion may also be arranged in the left-right direction.
In order to reduce the volume of the valve body, a fluid inlet on the valve body for fluid to enter the valve body and a fluid outlet on the valve body for fluid to flow out of the valve body are both arranged in the middle of the valve body, and the central lines of the fluid inlet and the fluid outlet are both used for adjusting the axis of the rod 17. The arrangement mode of the fluid inlet and the fluid outlet of the valve body can reduce the volume of the valve body to the maximum extent and reduce the cost of the valve body. The fluid inlet in this embodiment is provided on the inlet connection 11 and the fluid outlet is provided on the outlet connection 3. The junction of the inlet joint 11 and the valve body is also provided with an inlet aluminum gasket 22, and the junction of the outlet joint 3 and the valve body is provided with an outlet aluminum gasket 2, so that the sealing performance of the inlet and the outlet is ensured. It should be noted that, in order to ensure the cleanliness of the fluid entering the valve body, the inlet structure 11 in this embodiment is further provided with a filtering structure for filtering the fluid. In other embodiments, the center lines of the fluid inlet and the fluid outlet can also be arranged at a certain included angle with the adjusting rod; the inlet connection may also be provided without a filter structure.
In consideration of the difference in the elastic force required for the elastic pressure-regulating members of the high-pressure relief portion 16 and the low-pressure relief portion 1, in the present embodiment, the elastic pressure-regulating member of the high-pressure relief portion 16 is a disc spring 27, and the elastic pressure-regulating member of the low-pressure relief portion 1 is a spring 21. The structural characteristics of the disc spring 27 and the spring 21 can respectively meet the stress requirements of pressure reducing parts of all stages. In other embodiments, the elastic pressure regulating member of the high pressure reducing portion may also be a spring; the elastic pressure-regulating member of the low-pressure relief portion may also be a disc spring. It should be noted that, in order to facilitate the installation of the disc spring 27 and the spring 21, the disc spring 27 in this embodiment is guided and assembled in the disc spring seat 15 on the valve body, and the spring 21 is guided and assembled in the spring seat on the valve body. In addition, a valve core spring 4 is arranged between the valve core 7 and the valve body in a propping mode, the valve core spring 4 is assembled on a valve core spring seat 14 in a guiding mode, and similarly, due to the fact that the elasticity required by the valve core spring on the high-pressure reducing part 16 and the elasticity required by the valve core spring on the low-pressure reducing part 1 are different, the elasticity of the valve core spring seat 14 of the high-pressure reducing part 16 is larger than that of the valve core spring. The high pressure reducing portion 16 and the low pressure reducing portion 1 have the same structure except for the difference in the elastic force between the elastic pressure adjusting member and the spool spring, and the high pressure reducing portion will be described below.
As shown in fig. 3, the valve seat comprises a base 5 and a pressing block 9, a sealing element 8 used for sealing the throttling opening when the throttling opening is closed is clamped between the pressing block 9 and the base 5, the pressing block 9 is assembled in the valve body in a threaded mode, the sealing element 8 is convenient to replace when the sealing element 8 fails in a sealing mode, the sealing effect of the valve seat and the valve core 7 is guaranteed, and the service life of a product is prolonged. Note that, in the present embodiment, the seal member 8 provided in the high-pressure relief portion 16 is made of a polyimide (Ys-20) material, and the seal member of the low-pressure relief portion 1 is made of a fluoroplastic (F3) material. In addition, still be equipped with sealing washer 6 between base 5 and the valve body, guarantee the leakproofness between base 5 and the valve body. In addition, in order to increase the sealing performance of the valve core on the throttling opening under the non-working state, the throttling opening in the embodiment is a conical flaring 19, the valve core 7 is provided with an annular conical surface 20 matched with the conical flaring 19, the throttling opening is closed when the annular conical surface 20 is pressed against the conical flaring 19, and the throttling opening is opened when the annular conical surface 20 leaves the conical flaring 19 under the pushing force of the ejector rod 10. The choke is formed by a gap between the conical flaring 19 and the annular conical surface 20, and the opening of the choke is adjusted by adjusting the gap between the annular conical surface 20 and the conical flaring 19 through the adjusting rod 17.
The valve seat hole in this embodiment includes minor diameter section 25 and major diameter section 24, and the choke sets up in the one end that major diameter section 24 is kept away from to minor diameter section 25, and case 7 cartridge is in minor diameter section 25, and ejector pin 10 and case 7 are in major diameter section 24 top press fit. On one hand, the small-diameter section 25 reduces the gap between the valve core 7 and the valve seat, and can play a good role in radially positioning the valve core 7; on the other hand, the fluid passing through the orifice also loses a part of the pressure when flowing through the clearance between the small diameter section 25 and the valve element 7 to further reduce the fluid pressure to bring the fluid to the set pressure. In order to prevent the ejector rod 10 from pressing against the end face of the valve seat to block the fluid from flowing into the low pressure chamber 12, in this embodiment, the end part of the valve seat far away from the throttling opening is provided with a communicating groove 30 for communicating the valve seat hole with the low pressure chamber 12. In addition, in order to avoid the throttling phenomenon of the fluid between the ejector rod 10 and the pressing block 9, the end part of the large-diameter section 24, which is far away from the small-diameter section 25, is provided with a flaring structure 29, and the communication groove 30 is communicated with the flaring structure 29. On the one hand, the flow area between the ejector rod 10 and the pressing block 9 is increased through the flaring structure 29, the throttling phenomenon of the fluid after pressure reduction between the ejector rod 10 and the valve seat is prevented, and on the other hand, the communicating groove 30 is communicated with the flaring structure 29, so that the communicating groove 30 and the flaring structure 29 are convenient to process. In other embodiments, the valve core may not be provided with the annular conical surface, but the valve core is provided with a stopping surface in stopping fit with the end surface of the base, and the throttle opening is closed when the stopping surface is in stopping fit with the base; the valve seat can also be of an integrated structure, and a sealing element can also not be arranged between the valve seat and the valve body; the aperture of each section of the valve seat hole can be the same; the large-diameter section can be provided with no flaring structure, so that the fluid flowing through the large-diameter section directly flows into the low-pressure cavity; the end of the valve seat may not be provided with a communicating groove.
It should be noted that the low-pressure reducing portion 1 and the high-pressure reducing portion 16 of the valve body are communicated through a flow passage, a fabrication hole for processing the flow passage is formed in the valve body, and a plug 23 for plugging the fabrication hole is connected to the valve body. In order to ensure the stability of the jacking force of the ejector rod 10 acting on the valve core 7, the valve core 7 is provided with a spherical surface, the ejector rod 10 is provided with a plane, and the valve core 7 and the ejector rod 10 are in jacking fit with the plane through the spherical surface. Through the cooperation of spherical surface and plane, conveniently realize the automatic alignment of ejector pin 10 and case 7, guarantee the stability of the jacking force of exerting on case 7. In other embodiments, the pushing surface on the valve core, which is in pushing fit with the push rod, may also be a planar structure. In consideration of the inaccurate pressure at the outlet of the pressure reducing valve caused by the rotation of the adjusting rod 17 under the action of the fluid pressure when the pressure reducing valve is operated, the valve body in the embodiment is provided with a lock nut 18 for locking the adjusting rod 17 for adjusting the compression amount of the spring 21 or the disc spring 27 to the valve body. In other embodiments, the valve body may not have a lock nut disposed thereon.
The steel ball 28 is arranged between the adjusting rod 17 and the disc spring seat 15, even if the force transmitted to the disc spring seat 15 by the adjusting rod 17 is uneven, the force on two sides of the disc spring seat 15 is even through the adjustment of the steel ball 28, and finally the force transmitted to two sides of the disc spring 27 is also even, so that the phenomenon of blocking caused by uneven stress of the disc spring 27 is effectively prevented. The fluid in this embodiment is a gas, but in other embodiments the fluid may also be a liquid. The high-pressure reducing part 16 and the low-pressure reducing part 1 both adopt a diaphragm type structure, gas decompressed by the high-pressure reducing part enters a low-pressure cavity 12 of the high-pressure reducing part, the high-pressure diaphragm 26 is balanced with the elastic force of the disc spring 27 due to gas pressure, meanwhile, the gas decompressed by the high-pressure reducing part 16 enters a high-pressure cavity of the low-pressure reducing part 1, and the gas pressure borne by the low-pressure diaphragm is balanced with the elastic force of the spring 21, so that the pressure stabilizing effect is achieved. It should be noted that the high-pressure diaphragm 26 and the low-pressure diaphragm are both stably assembled in the valve body through the stopper 13.
The embodiment of the pressure reducing valve of the invention: the high-pressure relief portion 16 of the valve body is arranged in the up-down direction with the low-pressure relief portion 1. Slowly rotating the adjusting rod 17, compressing the disc spring 27 and the spring 21, transmitting force to the ejector rod 10 through the high-pressure diaphragm 26, and pushing the valve core 7 to move downwards to leave the conical flaring 19 to a certain opening height by the ejector rod 10; the force is transmitted to the ejector rod of the low-pressure reducing part 1 through the low-pressure membrane, and the ejector rod pushes the valve core of the low-pressure reducing part 1 to move downwards to leave the corresponding conical flaring to a certain opening height. When high-pressure gas entering from a fluid inlet of the inlet joint 11 sequentially passes through a throttling opening, a gap between the small-diameter section 25 and the valve core 7, the pressure loss part reaches the design pressure reduction requirement, the 40MPa high-pressure gas is reduced to 2MPa and then enters a high-pressure cavity of the low-pressure reduction part 1 through the large-diameter section 24 and the flaring structure 29, and the 2MPa low-pressure gas is reduced to 0.16MPa through the low-pressure reduction part 1 to meet the use requirement. In other embodiments, the pressure of the gas passing through the high-pressure decompressing portion 16, the low-pressure decompressing portion 1 may be other set pressures.
The pressure reducing valve is a two-stage diaphragm type pressure reducing valve, the inlet pressure can reach 40 MPa-0.5 MPa, the outlet pressure can reach 0.16 +/-0.02 MPa, the flow is between 0.1L/S and 4.5L/S (normal temperature), the inlet pressure and the flow span are large, and the high-precision use working condition of the pressure reducing valve can be met.
Claims (8)
1. The pressure reducing valve is characterized in that a valve seat hole for communicating the throttling port with the low-pressure cavity is further formed in the valve seat, fluid flowing through the throttling port enters the low-pressure cavity through the valve seat hole, and the ejector rod is inserted into the valve seat hole; the throttling opening is a conical flaring, an annular conical surface matched with the conical flaring is arranged on the valve core, the throttling opening is closed when the annular conical surface is pressed against the conical flaring, and the throttling opening is opened when the annular conical surface leaves the conical flaring under the action of the jacking force of the jacking rod; the valve seat comprises a base and a pressing block, a sealing element used for sealing the throttling opening when the throttling opening is closed is clamped between the pressing block and the base, and the pressing block is assembled in the valve body in a threaded mode; the conical flaring is arranged on the base; the throttle orifice is formed by a gap between the conical flaring and the annular conical surface, and the opening of the throttle orifice is adjusted by adjusting the gap between the annular conical surface and the conical flaring by an adjusting rod.
2. The pressure reducing valve according to claim 1, wherein a communication groove communicating the valve seat hole with the low pressure chamber is provided at an end portion of the valve seat remote from the orifice.
3. The pressure reducing valve according to claim 2, wherein a flaring structure is arranged at the end part of the valve seat hole far away from the throttling port, and the communication groove is communicated with the flaring structure.
4. The pressure reducing valve according to claim 1, 2 or 3, wherein the valve seat hole comprises a small diameter section and a large diameter section, the throttling port is arranged at one end of the small diameter section far away from the large diameter section, the valve core is inserted into the small diameter section, and the ejector rod and the valve core are in top press fit in the large diameter section.
5. The pressure reducing valve according to claim 1, 2 or 3, wherein the pressure reducing valve is a two-stage pressure reducing valve including a high pressure reducing portion and a low pressure reducing portion, a fluid inlet through which fluid enters the valve body and a fluid outlet through which fluid exits the valve body are respectively communicated with a high pressure chamber of the high pressure reducing portion and a low pressure chamber of the low pressure reducing portion, the low pressure chamber of the high pressure reducing portion is communicated with the high pressure chamber of the low pressure reducing portion so that fluid reduced in pressure by the high pressure reducing portion flows into the low pressure reducing portion for secondary pressure reduction, the regulating rods of the high pressure reducing portion and the low pressure reducing portion are respectively disposed at two opposite ends of the valve body, and the regulating rods of the high pressure reducing portion and the low pressure reducing portion are coaxially disposed.
6. The pressure reducing valve according to claim 5, wherein the elastic pressure regulating member of the high pressure reducing portion is a disc spring, and the elastic pressure regulating member of the low pressure reducing portion is a spring.
7. The pressure reducing valve according to claim 1, 2 or 3, wherein the valve core has a spherical surface, the stem has a flat surface, and the valve core and the stem are in press fit with the flat surface through the spherical surface.
8. The pressure reducing valve according to claim 1, 2 or 3, wherein the valve body is provided with a lock nut for locking an adjusting rod for adjusting the compression amount of the pressure regulating elastic member to the valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810402491.0A CN108591558B (en) | 2018-04-28 | 2018-04-28 | Pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810402491.0A CN108591558B (en) | 2018-04-28 | 2018-04-28 | Pressure reducing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108591558A CN108591558A (en) | 2018-09-28 |
| CN108591558B true CN108591558B (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810402491.0A Active CN108591558B (en) | 2018-04-28 | 2018-04-28 | Pressure reducing valve |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112524113B (en) * | 2020-11-30 | 2023-04-14 | 重庆红江机械有限责任公司 | Hydraulic pressure stabilizing valve |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT241069Y1 (en) * | 1996-12-16 | 2001-04-20 | Macrifin Spa | REGULATING VALVE WITH PRESSURE VALUE INDICATOR |
| CN2305530Y (en) * | 1997-03-10 | 1999-01-27 | 范杰 | Two stage pressure reducing integrated gas pressure reducer |
| KR100656278B1 (en) * | 2006-02-17 | 2006-12-11 | 주식회사 노비타 | Pressure reducing valve |
| JP2008224040A (en) * | 2008-04-17 | 2008-09-25 | Kawasaki Precision Machinery Ltd | Overflow preventing valve device |
| CN201715057U (en) * | 2010-06-18 | 2011-01-19 | 同济大学 | Balance piston induction type pneumatic pressure relief valve |
| CN202032139U (en) * | 2011-04-21 | 2011-11-09 | 饶华林 | Pressure reduction, stabilization and relief integrated safety valve |
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