Two-stage valve opening regulating valve

Abstract

The utility model discloses a two-stage type valve opening regulating valve which comprises a valve body, an outer valve element, a valve cover and a valve rod, the upper end and the lower end of a valve seat are communicated, a feeding cavity, a valve cavity and a discharging cavity are communicated through a communicating hole, the outer valve element for blocking the communicating hole is installed in the valve cavity in a sliding mode, and a positioning cover is fixedly installed at the upper end of the outer valve element in a covering mode. An inner valve element is installed in the outer valve element in a lifting sliding mode, a valve element cavity is formed in the outer valve element through a positioning cover, the valve element cavity is communicated with the valve seat installation opening, an inner valve element is installed in the valve element cavity in a lifting sliding mode, the inner valve element blocks an opening of the valve element cavity, a valve rod is fixedly connected to the upper end of the inner valve element, and the upper end of the valve rod penetrates through the valve cover. The outer valve element is provided with a normally-open liquid inlet channel enabling the valve element cavity to be communicated with the feeding cavity. The regulating valve can perform two-section regulation to more accurately control the flow, so that a pipeline is protected, and the use effect is improved.

Description

Technical Field

[0001] The utility model relates to a regulating valve, in particular to a two-stage valve-opening regulating valve. Background Art

[0002] The cage regulating valve is a pressure-balanced regulating valve, and the valve internals adopt a pilot valve core guided by a sleeve. At present, the cage pressure regulating valve includes a valve body, a valve core, a valve cover and a valve stem. The valve body and the valve cover are connected by a detachable device. The valve stem penetrates through the valve cover. The valve body is provided with a feed chamber, a discharge chamber, a feed port and a discharge port. A valve seat installation opening for separating the feed chamber and the discharge chamber is arranged inside the valve body. A valve seat is installed in the valve seat installation opening. A through hole is arranged on the valve seat. A valve core is installed in the valve seat. The valve core is connected to the upper end of the valve stem, and the valve stem is connected to a pneumatic actuator. The pneumatic actuator drives the valve stem to stretch and contract, thereby driving the valve core to axially move to open or close the through hole on the valve seat, thus realizing the opening and closing of the regulating valve. By changing the moving position of the valve core, the opening size of the through hole is changed, thereby realizing the regulation of flow rate and pressure.

[0003] Patent No. 202221914392.9 discloses a cage pressure regulating valve. The regulating valve is provided with a communication hole on the valve seat, and the communication hole is set in a shape that is wider at the top and narrower at the bottom. In this way, the valve core can gradually open or close the communication hole by lifting and lowering, and the flow rate first flows out from the narrow communication hole, so that the flow rate can be adjusted. However, a plurality of communication holes are arranged on the valve seat. When the valve rises, all the plurality of communication holes will surely open and the flow rate will flow out, and it is impossible to adjust a smaller flow rate, which affects the fine operation. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: a two-stage valve-opening regulating valve, which can perform two-stage regulation to more accurately control the flow rate, protect the pipeline and improve the use effect.

[0005] To solve the above technical problems, the technical solution of the present utility model is: a two-stage valve-opening regulating valve, including a valve body, an outer valve core, a valve cover and a valve rod. The valve body and the valve cover are connected by a detachable device. The valve body is provided with a feed chamber, a discharge chamber, a feed port and a discharge port. A valve seat installation opening for separating the feed chamber and the discharge chamber is arranged inside the valve body. A valve seat is installed inside the valve body. The upper end of the valve seat is clamped between the valve body and the valve cover, and the lower end of the valve seat is hermetically installed at the valve seat installation opening. A valve chamber and a plurality of communication holes are arranged on the valve seat. It is characterized in that: the upper end and the lower end of the valve seat are communicated, the communication holes communicate the feed chamber, the valve chamber and the discharge chamber, an outer valve core for blocking the communication holes is slidably installed in the valve chamber, a positioning cover is fixedly installed on the upper end of the outer valve core, an inner valve core is slidably installed in the outer valve core in a lifting manner, a valve core chamber is formed in the outer valve core through the positioning cover, the valve core chamber is communicated with the valve seat installation opening, an inner valve core is slidably installed in the valve core chamber in a lifting manner, the inner valve core blocks the opening of the valve core chamber, the upper end of the inner valve core is fixedly connected with a valve rod, the upper end of the valve rod penetrates through the valve cover, and a normally open liquid inlet channel for communicating the valve core chamber with the feed chamber is arranged on the outer valve core.

[0006] As a preferred solution, a support step is arranged on the upper end surface of the valve seat installation opening. The height at which the communication holes are opened is higher than the support step. The support step supports the outer valve core, and an inclined chamfer for cooperating with the valve seat installation opening is arranged at the lower end of the outer valve core.

[0007] As a preferred solution, a positioning retaining ring is arranged on the lower end surface of the positioning cover. The positioning retaining ring cooperates with the side wall of the valve core chamber of the outer valve core. The positioning cover is fixedly installed on the outer valve core by screws. A cylindrical protrusion penetrating the positioning cover is arranged on the inner valve core. The valve rod is threadedly connected with the cylindrical protrusion. An inclined chamfer for blocking the opening of the valve core chamber is also arranged on the lower end surface of the inner valve core.

[0008] As a preferred solution, a plurality of cover plate balance through holes are arranged on the positioning cover. Valve core balance through holes corresponding to the cover plate balance through holes are arranged on the inner valve core. The cover plate balance through holes and the valve core balance through holes communicate the valve chamber and the valve core chamber.

[0009] As a preferred solution, a sealing ring for sealingly cooperating with the valve seat is clamped on the outer valve core.

[0010] As a preferred solution, the valve seat is of a cylindrical structure. A clamping step is provided at the lower end of the valve seat, and an installation step opening is provided at the valve seat installation port. The clamping step is inserted into the installation step opening, and a gasket is provided between the two; a clamping flange portion is provided at the upper end of the valve seat, and a flange clamping step is provided at the upper end of the valve body. The clamping flange portion is installed on the flange clamping step, and a gasket is provided between the two. A pressing portion for pressing the clamping flange portion is provided on the valve cover.

[0011] As a preferred solution, a sealing packing for sealingly cooperating with the valve cover when the valve stem moves up and down is provided inside the valve cover.

[0012] After adopting the above technical solution, the effects of the present utility model are as follows: Since the two-stage open-valve regulating valve includes a valve body, an outer valve core, a valve cover and a valve stem, the valve body and the valve cover are connected by a detachable device. The valve body is provided with a feed chamber, a discharge chamber, a feed port and a discharge port. A valve seat installation port for separating the feed chamber and the discharge chamber is provided inside the valve body. A valve seat is installed inside the valve body. The upper end of the valve seat is clamped between the valve body and the valve cover, and the lower end of the valve seat is sealingly installed at the valve seat installation port. A valve cavity and a plurality of communication holes are provided on the valve seat. It is characterized in that: the upper end and the lower end of the valve seat are communicated, the communication holes communicate the feed chamber, the valve cavity and the discharge chamber, an outer valve core for blocking the communication holes is slidably installed in the valve cavity, a positioning cover is fixedly covered on the upper end of the outer valve core, an inner valve core is slidably installed in the outer valve core in a lifting manner, a valve core cavity is formed in the outer valve core through the positioning cover, the valve core cavity is communicated with the valve seat installation port, an inner valve core is slidably installed in the valve core cavity in a lifting manner, the inner valve core blocks the opening of the valve core cavity, the upper end of the inner valve core is fixedly connected to the valve stem, the upper end of the valve stem penetrates through the valve cover, and a normally open liquid inlet channel for communicating the valve core cavity with the feed chamber is provided on the outer valve core; First, a discharge pipeline is connected to the discharge port, and a feed pipeline is connected to the feed port. At this time, the regulating valve is in a closed state. The feed pipeline inputs fluid, and the fluid enters the feed chamber, and then enters the valve core cavity through the liquid inlet channel. At this time, the inner valve core blocks the opening of the valve core cavity. At this time, the valve stem is driven to rise by a pneumatic actuator to drive the inner valve core to rise, so that the opening of the valve core cavity is opened. The fluid flows out from the opening of the valve core cavity, and then flows out from the valve seat installation port and enters the discharge chamber, and finally is discharged from the discharge hole. At this time, a smaller flow rate is adjusted, and at the same time, the internal fluid pressure can be reduced when the flow rate is large later to protect the discharge pipeline. The valve stem continues to rise, the inner valve core abuts against the positioning cover and continues to rise to drive the outer valve core to rise, and the communication holes are gradually opened. The fluid enters the valve cavity, and then continues to be discharged from the valve seat installation port, enters the discharge chamber, and finally is discharged from the discharge hole; This regulating valve can perform two-stage regulation to more accurately control the flow rate, protect the pipeline, and improve the use effect.

[0013] Also, since a support step is provided on the upper end surface of the valve seat mounting port, the height at which the communication hole is opened is higher than the support step, the support step supports the outer valve core, and an inclined chamfer for cooperating with the valve seat mounting port is provided at the lower end of the outer valve core; this facilitates the placement of the outer valve core in the valve cavity, ensures a good sealing effect, and the height at which the communication hole is opened can also effectively prevent fluid leakage.

[0014] Also, since a positioning retaining ring is provided on the lower end surface of the positioning cover, the positioning retaining ring cooperates with the side wall of the valve core cavity of the outer valve core, the positioning cover is fixedly installed on the outer valve core by screws, a cylindrical protrusion penetrating the positioning cover is provided on the inner valve core, the valve stem is threadedly connected to the cylindrical protrusion, and an inclined chamfer for blocking the opening of the valve core cavity is also provided on the lower end surface of the inner valve core; the installation efficiency and accuracy can be improved through the positioning retaining ring, and the inner valve core penetrating the positioning cover facilitates the lifting of the inner valve core, and the inclined chamfer can better achieve sealing.

[0015] Also, since a plurality of cover plate balance through holes are provided on the positioning cover, and corresponding valve core balance through holes are provided on the inner valve core, the cover plate balance through holes and the valve core balance through holes communicate between the valve cavity and the valve core cavity; this can balance the pressures in the two chambers and improve the usage effect.

[0016] Also, since a sealing ring that is hermetically fitted with the valve seat is clamped on the outer valve core; the sealing effect is further improved.

[0017] Also, since the valve seat is of a cylindrical structure, a clamping step is provided at the lower end of the valve seat, an installation step opening is provided at the valve seat mounting port, the clamping step is inserted into the installation step opening and a sealing gasket is provided between them; a clamping flange portion is provided at the upper end of the valve seat, a flange clamping step is provided at the upper end of the valve body, the clamping flange portion is installed on the flange clamping step and a sealing gasket is provided between them, and a pressing portion for pressing the clamping flange portion is provided on the valve cover; when assembling the regulating valve, the valve seat is placed into the valve body. Since the clamping step is inserted into the installation step opening and the clamping flange portion is installed on the flange clamping step, the installation position of the valve seat is defined, which facilitates installation and the sealing gasket can reduce the friction between components, and also makes the components fit more tightly, improving the sealing performance.

[0018] Also, since a sealing packing for hermetically fitting with the valve cover when the valve stem moves up and down is provided inside the valve cover; it can prevent fluid from being carried out by the valve stem after entering the valve cavity, improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following further describes the present invention in conjunction with the drawings and embodiments.

[0020] Figure 1 is a perspective view of an embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the valve seat and the outer valve core in the embodiment of the present utility model;

[0022] Figure 3 It is a schematic structural diagram of the valve seat, the outer valve core and the inner valve core rising to the highest position in the embodiment of the present utility model;

[0023] Figure 4 It is a schematic structural diagram of the inner valve seat and the positioning cover in the embodiment of the present utility model;

[0024] In the drawings: 1, valve body; 2, outer valve core; 3, valve cover; 4, valve rod; 5, feed chamber; 6, discharge chamber; 7, valve seat mounting port; 8, feed port; 9, discharge port; 10, valve seat; 11, valve cavity; 12, communication hole; 13, positioning cover; 14, inner valve core; 15, valve core cavity; 16, liquid inlet channel; 17, support step; 18, inclined chamfer; 19, positioning retaining ring; 20, cylindrical protrusion; 21, cover plate balance through hole; 22, valve core balance through hole; 23, sealing ring; 24, clamping step; 25, mounting step opening; 26, gasket; 27, clamping flange portion; 28, flange clamping step; 29, sealing packing. Detailed implementation manners

[0025] The present utility model will be further described in detail below through specific embodiments.

[0026] As Figures 1 to 4 shown, since the two-stage open-valve regulating valve includes a valve body 1, an outer valve core 2, a valve cover 3 and a valve rod 4, the valve body 1 and the valve cover 3 are connected by a detachable device, the valve body 1 is provided with a feed chamber 5, a discharge chamber 6, a feed port 8 and a discharge port 9, a valve seat mounting port 7 for separating the feed chamber 5 and the discharge chamber 6 is arranged inside the valve body 1, a valve seat 10 is installed inside the valve body 1, the upper end of the valve seat 10 is clamped between the valve body 1 and the valve cover 3, the lower end of the valve seat 10 is hermetically installed at the valve seat mounting port 7, a valve cavity 11 and a plurality of communication holes 12 are arranged on the valve seat 10, and it is characterized in that: the upper end and the lower end of the valve seat 10 are communicated, the communication holes 12 communicate the feed chamber 5, the valve cavity 11 and the discharge chamber 6, an outer valve core 2 for blocking the communication holes 12 is slidably installed in the valve cavity 11, a positioning cover 13 is fixedly installed on the upper end of the outer valve core 2, an inner valve core 14 is installed in the outer valve core 2 in a lifting and sliding manner, a valve core cavity 15 is formed in the outer valve core 2 through the positioning cover 13, the valve core cavity 15 is communicated with the valve seat mounting port 7, an inner valve core 14 is installed in the valve core cavity 15 in a lifting and sliding manner, the inner valve core 14 blocks the opening of the valve core cavity 15, the upper end of the inner valve core 14 is fixedly connected with the valve rod 4, the upper end of the valve rod 4 penetrates through the valve cover 3, and a normally open liquid inlet channel 16 for communicating the valve core cavity 15 with the feed chamber 5 is arranged on the outer valve core 2.

[0027] In this embodiment, a support step 17 is provided on the upper end surface of the valve seat mounting port 7. The height at which the communication hole 12 is opened is higher than that of the support step 17. The support step 17 supports the outer valve core 2. An inclined chamfer 18 that cooperates with the valve seat mounting port 7 is provided at the lower end of the outer valve core 2. The support step 17 can ensure that the outer valve core 2 is effectively supported, so that the outer valve core 2 can block the main communication hole 12. It is more convenient to place the outer valve core 2 in the valve cavity 11, and at the same time, a good sealing effect is ensured. The height at which the communication hole 12 is opened can also well prevent fluid leakage.

[0028] As Figure 1 shown, a positioning retaining ring 19 is provided on the lower end surface of the positioning cover 13. The positioning retaining ring 19 cooperates with the side wall of the valve core cavity 15 of the outer valve core 2. The positioning cover 13 is fixedly installed on the outer valve core 2 by screws. A cylindrical protrusion 20 that penetrates the positioning cover 13 is provided on the inner valve core 14. The valve stem 4 is threadedly connected to the cylindrical protrusion 20. An inclined chamfer 18 that blocks the opening of the valve core cavity 15 is also provided on the lower end surface of the inner valve core 14. The positioning retaining ring 19 can improve the installation efficiency and accuracy, and the inner valve core 14 penetrating the positioning cover 13 facilitates the lifting and lowering of the inner valve core 14. The inclined chamfer 18 can better complete the sealing.

[0029] As Figure 3 and Figure 4 shown, a plurality of cover plate balance through holes 21 are provided on the positioning cover 13. Corresponding valve core balance through holes 22 are provided on the inner valve core 14. The cover plate balance through holes 21 and the valve core balance through holes 22 communicate the valve cavity 11 and the valve core cavity 15. When the inner valve core 14 rises to contact the positioning retaining ring 19 or descends to block the opening of the valve core cavity 15, the fluid can flow smoothly, reducing the internal pressure and balancing the pressure in the two chambers, improving the use effect.

[0030] As Figure 2 shown, a sealing ring 23 that is hermetically fitted with the valve seat 10 is clamped on the outer valve core 2; improving the sealing performance of the outer valve core 2 during lifting and lowering and ensuring the accurate delivery of the flow rate.

[0031] In this embodiment, the valve seat 10 has a cylindrical structure. A clamping step 24 is provided at the lower end of the valve seat 10, and an installation step opening 25 is provided at the valve seat installation port 7. The clamping step 24 is inserted into the installation step opening 25, and a sealing gasket 26 is provided between them; a clamping flange portion 27 is provided at the upper end of the valve seat 10, and a flange clamping step 28 is provided at the upper end of the valve body 1. The clamping flange portion 27 is installed on the flange clamping step 28, and a sealing gasket 26 is provided between them. A pressing portion for pressing the clamping flange portion 27 is provided on the valve cover 3; when assembling the regulating valve, the valve seat 10 is placed into the valve body 1. Since the clamping step 24 is inserted into the installation step opening 25 and the clamping flange portion 27 is installed on the flange clamping step 28, the installation position of the valve seat 10 is defined, making it convenient and quick to install. Moreover, the sealing gasket 26 can reduce the friction between components, make the installation between components closer, and improve the sealing performance.

[0032] Furthermore, the communication hole 12 is a through hole that is wider at the top and narrower at the bottom; when the valve stem 4 starts to drive the outer valve core 2 to rise, due to the communication hole 12 being wider at the top and narrower at the bottom, the lower part plays an effective blocking role. Therefore, the flow rate increases from small to large, avoiding excessive pressure when the fluid directly enters the valve cavity 11 and effectively protecting the valve seat 10.

[0033] A sealing packing 29 for sealing cooperation between the valve stem 4 and the valve cover 3 during the lifting and lowering process is provided inside the valve cover 3; this prevents the fluid from being carried out by the valve stem 4 after entering the valve cavity 11 and improves the sealing effect.

[0034] The working principle of this embodiment: First, the discharge port 9 is connected to the discharge pipeline, and the feed port 8 is connected to the feed pipeline. At this time, the regulating valve is in the closed state. The fluid is input through the feed pipeline and enters the feed chamber 5, and then enters the valve core chamber 15 through the liquid inlet channel 16. At this time, the inner valve core 14 blocks the opening of the valve core chamber 15. Then, the valve stem 4 is driven to rise by the pneumatic actuator, driving the inner valve core 14 to rise, opening the opening of the valve core chamber 15. The fluid flows out from the opening of the valve core chamber 15, then flows out from the valve seat installation port 7 and enters the discharge chamber 6, and finally is discharged from the discharge hole. The valve stem 4 continues to rise, the inner valve core 14 abuts against the positioning cover 13 and continues to rise, driving the outer valve core 2 to rise, and the communication hole 12 is gradually opened. The fluid enters the valve cavity 11, then continues to be discharged from the valve seat installation port 7, enters the discharge chamber 6, and finally is discharged from the discharge hole.

[0035] The above-described embodiments are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and modifications made to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A two-stage open-valve regulating valve, comprising a valve body, an outer valve core, a valve cover and a valve stem, wherein the valve body and the valve cover are connected by a detachable device, the valve body is provided with a feed chamber, a discharge chamber, a feed port and a discharge port, the valve body is provided with a valve seat installation port for separating the feed chamber and the discharge chamber, the valve body is provided with a valve seat, the upper end of the valve seat is clamped between the valve body and the valve cover, the lower end of the valve seat is sealingly installed at the valve seat installation port, the valve seat is provided with a valve cavity and a plurality of communicating holes, and is characterized in that: The upper and lower ends of the valve seat are connected, and the connecting hole connects the feed chamber, the valve chamber and the discharge chamber. An outer valve core is slidably installed in the valve chamber to block the connecting hole, and a positioning cover is fixed on the upper end of the outer valve core. An inner valve core is lifted and slidably installed in the outer valve core. A valve core chamber is formed in the outer valve core through the positioning cover, and the valve core chamber is connected to the valve seat mounting port. An inner valve core is lifted and slidably installed in the valve core chamber. The inner valve core blocks the valve core chamber opening, and a valve stem is fixedly connected to the upper end of the inner valve core. The upper end of the valve stem passes through the valve cover, and a normally open liquid inlet channel is provided on the outer valve core to connect the valve core chamber with the feed chamber.

2. A two-stage opening regulating valve as claimed in claim 1, characterized in that: The upper end surface of the valve seat installation port is provided with a support step, the connecting hole is opened at a height higher than the support step, the support step supports the outer valve core, and the lower end of the outer valve core is provided with an inclined chamfer that matches the valve seat installation port.

3. A two-stage opening regulating valve as claimed in claim 2, characterized in that: A positioning retaining ring is provided on the lower end surface of the positioning cover, and the positioning retaining ring cooperates with the side wall of the valve core cavity of the outer valve core. The positioning cover is fixedly installed on the outer valve core by screws, and a cylindrical protrusion penetrating the positioning cover is provided on the inner valve core. The valve stem is threadedly connected to the cylindrical protrusion, and an inclined chamfer is also provided on the lower end surface of the inner valve core to seal the valve core cavity opening.

4. A two-stage opening regulating valve as claimed in claim 3, characterized in that: The positioning cover is provided with a plurality of cover plate balancing through holes, and the inner valve core is provided with a valve core balancing through hole corresponding to the cover plate balancing through hole. The cover plate balancing through hole and the valve core balancing through hole communicate with each other between the valve cavity and the valve core cavity.

5. A two-stage opening regulating valve as claimed in claim 4, characterized in that: A sealing ring which is in sealing cooperation with the valve seat is clamped on the outer valve core.

6. A two-stage opening regulating valve as claimed in claim 5, characterized in that: The valve seat is a cylindrical structure, and a clamping step is provided at the lower end of the valve seat, and an installation step opening is provided at the valve seat installation opening. The clamping step is inserted into the installation step opening and a sealing gasket is provided between the two; a clamping flange portion is provided at the upper end of the valve seat, and a flange clamping step is provided at the upper end of the valve body. The clamping flange portion is installed on the flange clamping step and a sealing gasket is provided between the two, and a clamping portion is provided on the valve cover to clamp the clamping flange portion.

7. A two-stage opening regulating valve as claimed in claim 6, characterized in that: The valve cover is provided with a sealing packing which is in sealing cooperation with the valve cover when the valve stem is lifted or lowered.

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