A precision pressure reducing valve

Abstract

This invention relates to the field of pressure reducing valves, specifically a precision pressure reducing valve comprising a valve body assembly and a valve cover assembly, the valve body assembly and the valve cover assembly being threadedly connected. The valve body assembly includes: a valve seat, a first spring, a valve body, a spring seat, a valve core, and a valve seat support. The valve cover assembly includes: a silver-plated lubricating sleeve, a stop plate, a valve cover, a valve stem, a handle, a second spring, and a diaphragm. The valve body is provided with an outlet channel and an inlet channel that are connected in both the horizontal and vertical directions, and an air cavity is provided at the top. The valve seat support is threadedly connected to the valve body. The spring seat is located at the end of the vertical channel of the inlet channel away from the air cavity. The first spring is sleeved on the outer layer of the valve core. The valve core is abutted against the spring seat and the valve seat through the first spring. The diaphragm is abutted between the valve body and the stop plate. The second spring is abutted between the stop plate and the valve stem. The handle is threadedly connected to the valve stem. The lubricating sleeve is sleeved on the outer layer of the diaphragm. This design ensures no gas leakage and enhances the sealing performance of the pressure reducing valve.

Description

Technical Field

[0001] This invention relates to the field of pressure reducing valves, and more particularly to a precision pressure reducing valve. Background Technology

[0002] A pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure by adjustment, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. The sealing performance at the valve cover is a key technology; pressure reducing valves have extremely high requirements for the sealing performance of the valve cover assembly.

[0003] In the prior art, the external sealing surface of the pressure reducing valve is sealed by rotating and locking the valve cover. The valve cover presses the metal diaphragm against the valve body sealing surface for sealing. Although grease is applied to the contact surface between the valve cover and the metal diaphragm, most of the grease is squeezed out during the locking process due to the force on the contact surface, which reduces the lubrication effect. This can easily cause the valve cover to rotate, resulting in rotational displacement between the metal diaphragm and the valve body sealing surface, causing mutual abrasion and gas leakage at the external sealing surface.

[0004] Therefore, it is necessary to provide a precision pressure reducing valve to solve the above-mentioned technical problems. Summary of the Invention

[0005] To overcome the problems of existing rotary locking pressure reducing valves where most of the lubricating grease is squeezed out during valve cover rotation, causing the valve cover to rotate and the metal diaphragm to rotate, resulting in rotational displacement between the metal diaphragm and the valve body sealing surface, mutual abrasion, and gas leakage at the external sealing surface, this invention provides a precision pressure reducing valve.

[0006] To address the aforementioned technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] A precision pressure reducing valve includes a valve body assembly and a valve cover assembly, wherein the valve body assembly and the valve cover assembly are threadedly connected, and the valve body assembly includes: a valve seat, a first spring, a valve body, a spring seat, a valve core, and a valve seat support;

[0008] The valve cover assembly includes: a lubrication sleeve, a stop plate, a valve cover, a valve stem, a handle, a second spring, and a diaphragm.

[0009] The valve body is provided with an air outlet channel and an air inlet channel that are connected in both the horizontal and vertical directions, and an air cavity is provided at the top that is connected to the air outlet channel and the air inlet channel respectively; the valve seat, the first spring, the spring seat and the valve core are all disposed in the vertical channel of the air inlet channel; the valve seat is threadedly connected to the valve body and is located at the end of the vertical channel of the air inlet channel near the air cavity; the spring seat is disposed at the end of the vertical channel of the air inlet channel away from the air cavity; the first spring is sleeved on the outer layer of the valve core; the valve core is abutted and connected to the spring seat and the valve seat through the first spring;

[0010] The diaphragm is abutted between the valve body and the stop plate; the second spring is abutted between the stop plate and the valve stem; the handle is threadedly connected to the valve stem.

[0011] The lubrication sleeve is fitted over the outer layer of the diaphragm, and has two inverted L-shaped longitudinal sections, and is radially and longitudinally abutting and connected to the valve cover;

[0012] The surface of the lubricating sleeve is silver-plated.

[0013] As a further aspect of the present invention, the thickness of the silver plating on the surface of the lubricating sleeve is 4 to 6 μm.

[0014] As a further aspect of the present invention: the valve core includes an upper valve core portion, a frustum portion and a lower valve core portion; the valve seat is in abutting connection with the conical surface of the frustum portion.

[0015] As a further aspect of the present invention: a spring button is provided between the second spring and the valve stem.

[0016] As a further aspect of the present invention: the end of the valve stem near the second spring is conical; the spring button is hollow conical, corresponding to the conical shape of the second spring, and the two are connected in abutting manner.

[0017] As a further embodiment of the present invention: the valve cover assembly further includes a handle cover, which is disposed at the upper center of the handle and the two are snap-fitted together.

[0018] As a further embodiment of the present invention: the longitudinal section of the handle is H-shaped, including a handle body, an upper hole and a lower hole, and a through hole connecting the upper hole and the lower hole.

[0019] As a further embodiment of the present invention: the valve cover assembly further includes a first nut and a second adjusting nut; both the first nut and the second adjusting nut are threadedly connected to the valve stem; the second adjusting nut is confined within the through hole; the first nut is disposed within the upper hole; the handle is threadedly connected to the valve stem via the second adjusting nut.

[0020] As a further aspect of the present invention: the valve body assembly further includes an air outlet, an air outlet pipe, an air inlet pipe, and an air inlet; the air outlet pipe and the air inlet pipe are both welded to the valve body and are respectively connected to the air outlet of the air outlet channel and the air inlet of the air inlet channel; the air outlet and the air inlet are respectively threaded to the air outlet pipe and the air inlet pipe, and are respectively disposed on the outer layer of the air outlet pipe and the air inlet pipe.

[0021] The beneficial effects of the precision pressure reducing valve involved in this invention are as follows:

[0022] Because a lubricating sleeve is added between the valve cover and the diaphragm, during assembly, the lubricating sleeve is pressed down by rotating and locking the valve cover. The lubricating sleeve then presses down on the diaphragm, and the diaphragm, under pressure, comes into contact with the sealing surface of the valve body seat, achieving a sealing effect. This solves the problem of the diaphragm rotating and scratching the sealing surface of the valve body seat when the valve cover is rotated and locked, thus ensuring no gas leakage and enhancing the sealing performance of the pressure reducing valve. Attached Figure Description

[0023] Figure 1 This is an exploded view of the precision pressure reducing valve of the present invention;

[0024] Figure 2 This is the present invention. Figure 1 Enlarged view of section A in the middle;

[0025] Figure 3 This is the present invention. Figure 1 Enlarged view of section B;

[0026] Figure 4 This is the present invention. Figure 1 Enlarged view of section C;

[0027] Figure 5 This is a three-dimensional view of the precision pressure reducing valve structure of the present invention;

[0028] Figure 6 This is a front view of the precision pressure reducing valve of the present invention;

[0029] Figure 7 This is the present invention. Figure 6 Enlarged view of section D;

[0030] Figure 8 This is a front view of the handle of the present invention;

[0031] Figure 9 This is a three-dimensional view of the valve core structure of the present invention.

[0032] In the diagram: 100 - Valve body assembly, 1a0 - Valve seat, 1b0 - First spring, 1c0 - Air outlet, 1d0 - Air outlet pipe, 1e0 - Valve body, 1e1 - Air cavity, 1e2 - Air outlet channel, 1e3 - Air inlet channel, 1f0 - Air inlet pipe, 1g0 - Air inlet, 1h0 - Spring seat, 1i0 - Valve core, 1i1 - Upper valve core, 1i2 - Conical part, 1i3 - Lower valve core, 1j0 - Valve seat Support, 200-valve cover assembly, 2a0-lubricating sleeve, 2b0-stop plate, 2c0-valve cover, 2d0-valve stem, 2e0-first nut, 2f0-handle, 2f1-handle body, 2f2-lower hole, 2f3-through hole, 2f4-upper hole, 2g0-handle cover, 2h0-second adjusting nut, 2i0-spring button, 2j0-second spring, 2k0-sealing ring, 2m0-diaphragm. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the following detailed description of a precision pressure-reducing valve, in conjunction with the accompanying drawings and embodiments, is provided. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0034] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "center," "longitudinal," "lateral," "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] like Figures 1 to 9 As shown, a precision pressure reducing valve includes a valve body assembly 100 and a valve cover assembly 200. The valve body assembly 100 and the valve cover assembly 200 are threadedly connected. The valve body assembly 100 includes: a tubular valve seat 1a0, a first spring 1b0, a valve body 1e0, a spring seat 1h0, a valve core 1i0, and a valve seat support 1j0. The valve core 1i0 includes an upper valve core portion 1i1, a frustum portion 1i2, and a lower valve core portion 1i3. The valve seat 1a0 and the frustum portion 1i2 are abutted together. The frustum portion 1i2 is provided to better exert the valve control function of the precision pressure reducing valve.

[0037] The valve body 1e0 is provided with an air outlet channel 1e2 and an air inlet channel 1e3 that are connected in both the horizontal and vertical directions. An air cavity 1e1 is provided at the top, which is connected to both the air outlet channel 1e2 and the air inlet channel 1e3. The valve seat 1a0, the first spring 1b0, the spring seat 1h0, and the valve core 1i0 are all disposed in the vertical channel of the air inlet channel 1e3. The valve seat support 1j0 is threadedly connected to the valve body 1e0 and is positioned at the end of the vertical channel of the air inlet channel 1e3 near the air cavity 1e1. The spring seat 1h0 is disposed at the end of the vertical channel of the air inlet channel 1e3 away from the air cavity 1e1. The first spring 1b0 is sleeved on the outer layer of the valve core 1i0. The valve core 1i0 is abutted against and connected to the spring seat 1h0 and the valve seat 1a0 via the first spring 1b0.

[0038] The valve cover assembly 200 includes: a lubrication sleeve 2a0, a stop plate 2b0, a valve cover 2c0, a valve stem 2d0, a first nut 2e0, a handle 2f0, a handle cover 2g0, a second adjusting nut 2h0, a second spring 2j0, a sealing ring 2k0, and a diaphragm 2m0; the handle cover 2g0 is located at the upper center of the handle 2f0, and the two are snap-fitted together; the sealing ring 2k0 is fastened to the outer layer of the stop plate 2b0, and serves as a radial limiter.

[0039] The handle 2f0 has an H-shaped longitudinal section, including a handle body 2f1, an upper hole 2f4 and a lower hole 2f2, and a through hole 2f3 connecting the upper hole 2f4, the lower hole 2f2 and the through hole 2f3;

[0040] The first nut 2e0 and the second adjusting nut 2h0 are both threadedly connected to the valve stem 2d0; the second adjusting nut 2h0 is confined within the through hole 2f3; the first nut 2e0 is disposed within the upper hole 2f4; the handle 2f0 is threadedly connected to the valve stem 2d0 via the second adjusting nut 2h0.

[0041] The diaphragm 2m0 is abutted between the valve body 1e0 and the stop plate 2b0; the second spring 2j0 is abutted between the stop plate 2b0 and the valve stem 2d0; the handle 2f0 is threadedly connected to the valve stem 2d0;

[0042] The lubrication sleeve 2a0 is fitted over the outer layer of the diaphragm 2m0, and has two inverted L-shaped longitudinal sections, and is radially and longitudinally abutting against the valve cover 2c0.

[0043] During assembly, first place the valve cover 2c0 on the special fixture, then insert the lubrication sleeve 2a0 into the valve cover 2c0 according to the required orientation, then insert the diaphragm 2m0 into the lubrication sleeve 2a0 according to the required orientation, and finally rotate the valve body assembly 100 clockwise into the valve cover 2c0, then tighten it with a torque wrench to a torque of 200 N·m to complete the installation of the valve cover 2c0. After the valve cover 2c0 is installed, test it and then install the remaining parts of the valve cover assembly 200.

[0044] Because a lubricating sleeve 2a0 is added between the valve cover 2c0 and the diaphragm 2m0, during assembly, the lubricating sleeve 2a0 is pressed down by rotating and locking the valve cover 2c0. The lubricating sleeve 2a0 then presses down on the diaphragm 2m0. Under pressure, the diaphragm 2m0 comes into contact with the sealing surface of the valve body 1e0, achieving a sealing effect. This solves the problem of the diaphragm 2m0 being rotated and scratching the sealing surface of the valve body 1e0 when the valve cover 2c0 is rotated and locked, thus ensuring no gas leakage and enhancing the sealing performance of the pressure reducing valve.

[0045] like Figure 1 , Figure 6 , Figure 7 As shown, as a further embodiment of the present invention, the surface of the lubricating sleeve 2a0 is silver-plated.

[0046] The silver plating layer acts as a lubricant, exhibiting strong adhesion and preventing it from being squeezed out under stress, thus providing excellent lubrication. Adding a lubricating sleeve 2a0 to the precision pressure reducing valve allows for rotational locking of the lubricating sleeve 2a0 during assembly, preventing the diaphragm 2m0 from rotating. This solves the problem of traditional grease being easily squeezed out under stress during the rotational locking process, reducing lubrication effectiveness, and also addresses the issue of the diaphragm 2m0 being rotated by the lubricating sleeve 2a0 and damaging the sealing surface of the valve body 1e0. This ensures no gas leakage and further enhances the sealing performance of the pressure reducing valve.

[0047] like Figure 1 , Figure 6 , Figure 7 As shown, as a further embodiment of the present invention: the silver plating thickness on the surface of the lubrication sleeve 2a0 is 4μm, 5μm, or 6μm. This serves both a lubricating function and enhances the sealing performance of the pressure reducing valve, while also being economical and practical. The sealing effect is shown in Table 1.

[0048] like Figure 1 , Figure 6 As shown, as a further embodiment of the present invention: a spring button 2i0 is provided between the second spring 2j0 and the valve stem 2d0.

[0049] Setting the spring button 2i0 helps the second spring 2j0 and valve stem 2d0 to better perform their supporting function.

[0050] like Figure 1 , Figure 6As shown, as a further embodiment of the present invention: the end of the valve stem 2d0 near the second spring 2j0 is conical; the spring button 2i0 is hollow conical, corresponding to the conical shape of the second spring 2j0, and the two are connected by abutting against each other.

[0051] By setting the contact surfaces of the spring button 2i0 and the valve stem 2d0 to be conical, the supporting effect between the second spring 2j0 and the valve stem 2d0 can be better utilized, thus better controlling the regulating valve cover assembly 200.

[0052] like Figure 1 , Figure 5 , Figure 6 As shown, as a further embodiment of the present invention: the valve body assembly 100 further includes an air outlet 1c0, an air outlet pipe 1d0, an air inlet pipe 1f0, and an air inlet 1g0; the air outlet pipe 1d0 and the air inlet pipe 1f0 are respectively connected to the air outlet of the air outlet channel 1e2 and the air inlet of the air inlet channel 1e3 by welding to the valve body 1e0; the air outlet 1c0 and the air inlet 1g0 are respectively threaded to the air outlet pipe 1d0 and the air inlet pipe 1f0, and are respectively disposed on the outer layer of the air outlet pipe 1d0 and the air inlet pipe 1f0.

[0053] The system is equipped with an air outlet nozzle 1c0, an air outlet pipe 1d0, an air inlet pipe 1f0, and an air inlet nozzle 1g0, which allows for the rapid assembly of a precision pressure reducing valve, making it convenient to use and improving work efficiency.

[0054] Table 1

[0055]

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A precision pressure reducing valve, comprising a valve body assembly (100) and a valve cover assembly (200), the valve body assembly (100) being threadedly connected to the valve cover assembly (200), characterized in that the valve body assembly (100) comprises: Valve seat (1a0), first spring (1b0), valve body (1e0), spring seat (1h0), valve core (1i0), and valve seat support (1j0); The valve cover assembly (200) includes: a lubrication sleeve (2a0), a stop plate (2b0), a valve cover (2c0), a valve stem (2d0), a handle (2f0), a second spring (2j0), and a diaphragm (2m0); The valve body (1e0) is provided with an air outlet channel (1e2) and an air inlet channel (1e3) that are connected in both the horizontal and vertical directions. An air cavity (1e1) is provided at the top, which is connected to both the air outlet channel (1e2) and the air inlet channel (1e3). The valve seat (1a0), the first spring (1b0), the spring seat (1h0), and the valve core (1i0) are all disposed in the vertical channel of the air inlet channel (1e3). The valve seat support (1j0) is connected to the valve body. (1e0) threaded connection, and placed at the end of the vertical channel of the air intake channel (1e3) near the air cavity (1e1); the spring seat (1h0) is disposed at the end of the vertical channel of the air intake channel (1e3) away from the air cavity (1e1); the first spring (1b0) is sleeved on the outer layer of the valve core (1i0); the valve core (1i0) is abutted and connected to the spring seat (1h0) and the valve seat (1a0) through the first spring (1b0); The diaphragm (2m0) is abutted between the valve body (1e0) and the stop plate (2b0); the second spring (2j0) is abutted between the stop plate (2b0) and the valve stem (2d0); the handle (2f0) is threadedly connected to the valve stem (2d0); The lubrication sleeve (2a0) is fitted over the outer layer of the diaphragm (2m0), and has two inverted L-shaped longitudinal sections. It is radially and longitudinally abutting and connected to the valve cover (2c0). The surface of the lubrication sleeve (2a0) is silver-plated.

2. The precision pressure reducing valve according to claim 1, characterized in that: The thickness of the silver plating on the surface of the lubricating sleeve (2a0) is 4-6 μm.

3. The precision pressure reducing valve according to claim 1 or 2, characterized in that: The valve core (1i0) includes an upper valve core portion (1i1), a frustum portion (1i2), and a lower valve core portion (1i3); the valve seat (1a0) is abutted and connected to the conical surface of the frustum portion (1i2).

4. The precision pressure reducing valve according to claim 3, characterized in that: A spring button (2i0) is provided between the second spring (2j0) and the valve stem (2d0).

5. The precision pressure reducing valve according to claim 4, characterized in that: The valve stem (2d0) has a conical shape at the end near the second spring (2j0); the spring button (2i0) has a hollow conical shape, corresponding to the conical shape of the second spring (2j0), and the two are connected by abutting against each other.

6. The precision pressure reducing valve according to claim 5, characterized in that: The valve cover assembly (200) also includes a handle cover (2g0), which is located at the upper center of the handle (2f0) and the two are snap-fitted together.

7. The precision pressure reducing valve according to claim 6, characterized in that: The handle (2f0) has an H-shaped longitudinal section and includes a handle body (2f1), an upper hole (2f4) and a lower hole (2f2), as well as a through hole (2f3) connecting the upper hole (2f4), the lower hole (2f2) and the through hole.

8. The precision pressure reducing valve according to claim 7, characterized in that: The valve cover assembly (200) further includes a first nut (2e0) and a second adjusting nut (2h0); both the first nut (2e0) and the second adjusting nut (2h0) are threadedly connected to the valve stem (2d0); the second adjusting nut (2h0) is confined within the through hole (2f3); the first nut (2e0) is disposed within the upper hole (2f4); and the handle (2f0) is threadedly connected to the valve stem (2d0) via the second adjusting nut (2h0).

9. The precision pressure reducing valve according to any one of claims 1, 2, or 4 to 8, characterized in that: The valve body assembly (100) further includes an air outlet (1c0), an air outlet pipe (1d0), an air inlet pipe (1f0), and an air inlet (1g0); the air outlet pipe (1d0) and the air inlet pipe (1f0) are both welded to the valve body (1e0) and are respectively connected to the air outlet of the air outlet channel (1e2) and the air inlet of the air inlet channel (1e3); the air outlet (1c0) and the air inlet (1g0) are respectively threaded to the air outlet pipe (1d0) and the air inlet pipe (1f0) and are respectively disposed on the outer layer of the air outlet pipe (1d0) and the air inlet pipe (1f0).

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