Pressure reducing valve with function of reducing pressure loss at tail end

Abstract

The utility model provides a pressure reducing valve with the function of reducing pressure loss at the tail end. The pressure reducing valve comprises a valve body, a valve element assembly and a valve rod assembly. The valve body is provided with a water inlet, a normal-pressure water outlet and a reduced-pressure water outlet; the valve element assembly is installed on the valve body, and the lower end of the valve element assembly extends into the pressure reduction water outlet and is sealed with the pressure reduction water outlet in the circumferential direction. The valve rod assembly is installed on the inner side of the valve element assembly, and the lower end of the valve rod assembly penetrates through the valve element assembly and then extends into the pressure reduction water outlet. A sealing assembly is fixed to the lower end of the valve rod assembly. The lower end of the valve element assembly is provided with an annular flow guide cavity. The side wall of the inner edge of the annular flow guide cavity forms a first annular inclined surface which gradually inclines towards the outer side from bottom to top, and the side wall of the outer edge of the annular flow guide cavity forms a second annular inclined surface which gradually inclines towards the outer side from top to bottom; according to the utility model, the flowing smoothness of water at the pressure-reducing water outlet can be improved, so that the influence on the water outlet pressure and flow of the pressure-reducing water outlet can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, and more specifically, to a pressure reducing valve with the function of reducing end pressure loss. Background Technology

[0002] Pressure reducing valves are commonly used valves on the market to reduce fluid pressure. Currently, Chinese Patent Announcement No. CN212509688U discloses a multi-functional pressure reducing valve. However, in the structure of this multi-functional pressure reducing valve, when the moving valve stem drives the sealing gasket to move down to allow water to flow from the pressure reducing outlet, the water discharged from the lower end of the valve core will horizontally impact the inner wall of the pressure reducing outlet, which may obstruct the water from the pressure reducing outlet, thus affecting the outlet pressure and flow rate. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a pressure reducing valve with the function of reducing end pressure loss, which can improve the smoothness of water flow at the pressure reducing outlet, thereby avoiding the impact on the outlet pressure and flow rate.

[0004] This utility model provides a pressure reducing valve with the function of reducing end pressure loss, including a valve body, a valve core assembly, and a valve stem assembly; the valve body is provided with an inlet, a normal pressure outlet, and a pressure reducing outlet; the valve core assembly is installed on the valve body, and the lower end of the valve core assembly extends into the pressure reducing outlet and seals the pressure reducing outlet circumferentially; the valve stem assembly is installed inside the valve core assembly, and the lower end of the valve stem assembly passes through the valve core assembly and extends into the pressure reducing outlet; a sealing assembly is fixed to the lower end of the valve stem assembly; an annular guide cavity is provided at the lower end of the valve core assembly; the sidewall of the inner edge of the annular guide cavity forms a first annular inclined surface that gradually slopes outward from bottom to top, and the sidewall of the outer edge of the annular guide cavity forms a second annular inclined surface that gradually slopes outward from top to bottom.

[0005] By adopting the above structure, when the valve stem assembly drives the sealing assembly to move downward to allow water to flow from the pressure-reducing outlet, the first annular inclined surface and the second annular inclined surface can guide the water flow from the valve core assembly, thereby preventing the water flow from impacting the inner wall of the pressure-reducing outlet horizontally. This improves the smoothness of the water flow at the pressure-reducing outlet and avoids affecting the water pressure and flow rate at the pressure-reducing outlet.

[0006] In one possible implementation, the sealing assembly includes a sealing gasket and a pressure sleeve; the sealing gasket and pressure sleeve are positioned vertically and fitted onto the lower end of the valve stem assembly, with the upper end of the sealing gasket abutting against a first annular step on the lower end of the valve stem assembly, and the pressure sleeve being threadedly fastened to the valve stem assembly and pressing the sealing gasket against the first annular step; an annular rib is provided on the lower end of the valve core assembly located inside the annular guide cavity, the lower edge of the annular rib forming an arc surface; when the valve stem assembly moves the sealing assembly upward, the annular rib is used to press the upper end face of the sealing gasket to make the sealing gasket tightly seal against the lower end of the valve core assembly; by adopting this structure, the pressure sleeve... Under the action of the valve stem assembly, the sealing gasket can be reliably pressed onto the first annular step, that is, the sealing gasket can be reliably fixed together with the valve stem assembly and circumferentially sealed. In addition, the inner circumferential wall of the sealing gasket is tightly sealed to the outer circumferential wall of the valve stem assembly. Furthermore, since the lower end of the valve core assembly located inside the annular guide cavity is provided with an annular rib, the lower edge of the annular rib forms an arc surface. Thus, when the valve stem assembly drives the sealing assembly to move upward, the annular rib can squeeze the upper end surface of the sealing gasket to cause greater deformation of the upper end surface of the sealing gasket. This allows the sealing assembly to be reliably tightly sealed to the lower end of the valve core assembly, thereby improving the sealing effect.

[0007] In one possible implementation, an annular vertical edge is provided at the outer edge of the upper end of the pressure sleeve, and the sealing gasket is embedded in the inner side of the annular vertical edge. By adopting this structure, radial limiting of the pressure sleeve can be achieved, thereby preventing radial displacement of the sealing gasket and improving the reliability of the sealing gasket after assembly with the valve stem assembly. In addition, when the annular rib compresses the sealing gasket, the annular vertical edge can support the outer wall of the sealing gasket, thereby making the annular rib more reliably fit tightly against the sealing gasket to improve the sealing effect.

[0008] In one possible implementation, the pressure reducing valve further includes a check valve core; the check valve core is installed in the pressure reducing outlet located below the valve stem assembly and circumferentially seals the inner wall of the pressure reducing outlet; the check valve core prevents water from flowing back into the valve body.

[0009] In one possible implementation, a second annular step is provided on the inner wall of the pressure-reducing outlet, and the lower end of the check valve core abuts against the second annular step; a retaining spring is clamped on the inner wall of the pressure-reducing outlet above the check valve core, and the outer edge of the upper end of the check valve core abuts against the bottom of the inner edge of the retaining spring; with this structure, the check valve core can be reliably pressed into the interior of the pressure-reducing outlet under the action of the second annular step and the retaining spring. Attached Figure Description

[0010] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0011] Figure 2for Figure 1 A magnified structural diagram of point A in the middle. Detailed Implementation

[0012] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0013] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0014] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0015] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] See Figure 1-2 As shown in the figure, this application discloses a pressure reducing valve with the function of reducing end pressure loss, including a valve body 1, a valve core assembly 2, and a valve stem assembly 3; the valve body 1 is provided with an inlet 11, a normal pressure outlet 12, and a pressure reducing outlet 13; the valve core assembly 2 is installed on the valve body 1, and the lower end of the valve core assembly 2 extends into the pressure reducing outlet 13 and is circumferentially sealed with the pressure reducing outlet 13; the valve stem assembly 3 is installed inside the valve core assembly 2, and the lower end of the valve stem assembly 3 passes through the valve core assembly 2 and extends into the pressure reducing outlet 13; a sealing assembly 4 is fixed to the lower end of the valve stem assembly 3; an annular guide cavity 21 is provided at the lower end of the valve core assembly 2; the sidewall of the inner edge of the annular guide cavity 21 forms a first annular inclined surface 22 that gradually slopes outward from bottom to top, and the sidewall of the outer edge of the annular guide cavity 21 forms a second annular inclined surface 23 that gradually slopes outward from top to bottom.

[0017] The sealing assembly 4 includes a sealing gasket 41 and a pressure sleeve 42. The sealing gasket 41 and the pressure sleeve 42 are distributed vertically and fitted onto the lower end of the valve stem assembly 3. The upper end of the sealing gasket 41 abuts against the first annular step 31 on the lower end of the valve stem assembly 3. The pressure sleeve 42 is threadedly fastened to the valve stem assembly 3 and presses the sealing gasket 41 onto the first annular step 31. An annular rib 24 is provided on the lower end of the valve core assembly 2 located inside the annular guide cavity 21. The lower edge of the annular rib 24 forms an arc surface. When the valve stem assembly 3 drives the sealing assembly 4 to move upward, the annular rib 24 is used to squeeze the upper end surface of the sealing gasket 41 so that the sealing gasket 41 and the lower end of the valve core assembly 2 are tightly sealed. With this structure, under the action of the pressure sleeve, the sealing gasket can be reliably pressed onto the first annular step, meaning the sealing gasket can be reliably fixed to the valve stem assembly and provide a circumferential seal. Furthermore, the inner circumferential wall of the sealing gasket is tightly sealed against the outer circumferential wall of the valve stem assembly. And because the lower end of the valve core assembly located inside the annular guide cavity is provided with an annular rib, the lower edge of which forms an arc surface, when the valve stem assembly moves the sealing assembly upwards, the annular rib can compress the upper end face of the sealing gasket, causing greater deformation of the upper end face. This, in turn, allows the sealing assembly to reliably seal against the lower end of the valve core assembly, thereby improving the sealing effect.

[0018] An annular vertical edge 43 is provided at the outer edge of the upper end of the pressure sleeve 42, and the sealing gasket 41 is embedded in the inner side of the annular vertical edge 43. By adopting this structure, the radial limit of the pressure sleeve can be achieved, thereby preventing the sealing gasket from undergoing radial displacement, and thus improving the reliability of the sealing gasket after assembly with the valve stem assembly. In addition, when the annular rib compresses the sealing gasket, the annular vertical edge can support the outer wall of the sealing gasket, thereby making the annular rib more reliably fit tightly with the sealing gasket, so as to improve the sealing effect.

[0019] The pressure reducing valve also includes a check valve core 5; the check valve core 5 is installed in the pressure reducing outlet 13 located below the valve stem assembly 3 and is circumferentially sealed to the inner wall of the pressure reducing outlet 13; the check valve core prevents water from flowing back into the valve body.

[0020] A second annular step 131 is provided on the inner wall of the pressure-reducing outlet 13, and the lower end of the check core 5 abuts against the second annular step 131; a retaining spring 6 is clamped on the inner wall of the pressure-reducing outlet 13 above the check core 5, and the outer edge of the upper end of the check core 5 abuts against the bottom of the inner edge of the retaining spring 6; by adopting this structure, under the action of the second annular step and the retaining spring, the check core can be reliably pressed into the interior of the pressure-reducing outlet.

[0021] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pressure reducing valve with a function of reducing end pressure loss, comprising a valve body (1), a valve core assembly (2), and a valve stem assembly (3); the valve body (1) is provided with an inlet (11), a normal pressure outlet (12), and a pressure reducing outlet (13); the valve core assembly (2) is mounted on the valve body (1), and the lower end of the valve core assembly (2) extends into the pressure reducing outlet (13) and is circumferentially sealed to the pressure reducing outlet (13); the valve stem assembly (3) is mounted inside the valve core assembly (2), and the lower end of the valve stem assembly (3) extends into the pressure reducing outlet (13) after penetrating the valve core assembly (2); a sealing assembly (4) is fixed to the lower end of the valve stem assembly (3); characterized in that: The lower end of the valve core assembly (2) is provided with an annular flow guide cavity (21); the side wall of the inner edge of the annular flow guide cavity (21) forms a first annular inclined surface (22) that gradually slopes outward from bottom to top, and the side wall of the outer edge of the annular flow guide cavity (21) forms a second annular inclined surface (23) that gradually slopes outward from top to bottom.

2. The pressure reducing valve with end-point pressure loss reduction function according to claim 1, characterized in that: The sealing assembly (4) includes a sealing gasket (41) and a pressure sleeve (42); the sealing gasket (41) and the pressure sleeve (42) are distributed vertically and fitted onto the lower end of the valve stem assembly (3). The upper end of the sealing gasket (41) abuts against the first annular step (31) on the lower end of the valve stem assembly (3). The pressure sleeve (42) is threadedly fastened to the valve stem assembly (3) and presses the sealing gasket (41) onto the first annular step (31). An annular rib (24) is provided on the lower end of the valve core assembly (2) located inside the annular guide cavity (21). The lower edge of the annular rib (24) forms an arc surface. When the valve stem assembly (3) drives the sealing assembly (4) to move upward, the annular rib (24) is used to squeeze the upper end surface of the sealing gasket (41) so that the sealing gasket (41) and the lower end of the valve core assembly (2) are tightly sealed.

3. The pressure reducing valve with end-point pressure loss reduction function according to claim 2, characterized in that: An annular vertical edge (43) is provided at the outer edge of the upper end of the pressure sleeve (42), and the sealing gasket (41) is embedded in the inner side of the annular vertical edge (43).

4. The pressure reducing valve with end-point pressure loss reduction function according to any one of claims 1-3, characterized in that: The pressure reducing valve also includes a check valve core (5); the check valve core (5) is installed in the pressure reducing outlet (13) located below the valve stem assembly (3) and is circumferentially sealed to the inner wall of the pressure reducing outlet (13).

5. The pressure reducing valve with end pressure loss reduction function according to claim 4, characterized in that: The inner wall of the pressure-reducing outlet (13) is provided with a second annular step (131), and the lower end of the check valve core (5) abuts against the second annular step (131); a retaining spring (6) is installed on the inner wall of the pressure-reducing outlet (13) above the check valve core (5), and the outer edge of the upper end of the check valve core (5) abuts against the bottom of the inner edge of the retaining spring (6).

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