CN216895823U

CN216895823U - Flow control valve with high differential pressure and minimum pressure

Info

Publication number: CN216895823U
Application number: CN202220114657.0U
Authority: CN
Inventors: 张�诚; 刘志耕; 李海君
Original assignee: Chengdu Dazheng Haiweier Control Valve Co ltd
Current assignee: Chengdu Dazheng Haiweier Control Valve Co ltd
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-07-05
Anticipated expiration: 2032-01-17

Abstract

The utility model relates to the technical field of regulating valves, and provides a high-pressure-difference minimum flow regulating valve which comprises a main valve body and a valve core assembly, wherein the valve core assembly comprises a valve rod and a valve cage, an accommodating groove extending upwards is formed in the bottom of the main valve body, and a medium outlet penetrating through the accommodating groove in the transverse direction is formed in the side wall of the accommodating groove; a valve cage is arranged in the accommodating tank, the valve rod is matched with the valve cage, an annular flow guide cavity is formed between the main valve body and the valve cage and is communicated with the medium outlet, a regulating groove extending downwards is formed in the top of the valve cage, a plurality of transversely-penetrating throttling holes are formed in the inner wall of the regulating groove and are communicated with the annular flow guide cavity, a communicating groove extending upwards and communicated with the regulating groove is formed in the bottom of the valve cage, and a plurality of transversely-extending annular throttling cavities are formed in the upper portion of the inner wall of the communicating groove; the bottom of the main valve body is provided with an auxiliary valve body, the auxiliary valve body and the main valve body are sealed, and the auxiliary valve body is provided with a medium inlet which penetrates through the main valve body along the longitudinal direction.

Description

Flow control valve with high differential pressure and minimum pressure

Technical Field

The utility model relates to the technical field of regulating valves, in particular to a high-pressure-difference minimum flow regulating valve.

Background

In the automatic control of chemical plants, regulating valves play a very important role. The level of the leakage grade of the regulating valve directly influences the quality and the economic benefit of the final product.

At present, a valve core assembly of a regulating valve on the market is close to a medium inlet, the medium is generally and directly limited to the required flow, the flow rate of the medium is extremely high at the moment when the valve core assembly is just opened, a sealing surface on the valve core assembly can be excessively eroded by the medium, and the service life of the regulating valve is shortened.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide the flow regulating valve with the high pressure difference and the small pressure difference, so that when the valve core assembly is opened, the sealing surface on the valve core assembly cannot be excessively eroded by a medium.

In order to achieve the purpose, the utility model is realized by the following technical scheme: a high pressure difference minimum flow regulating valve comprises a main valve body and a valve core assembly, wherein the valve core assembly is installed on the main valve body and comprises a valve rod, an accommodating groove extending upwards is formed in the bottom of the main valve body, and a medium outlet penetrating through the accommodating groove in the transverse direction is formed in the side wall of the accommodating groove;

a valve cage is arranged in the accommodating groove, the valve cage is matched with the accommodating groove and is in sliding connection with the inner wall of the accommodating groove, an annular flow guide cavity is formed between the valve cage and the main valve body and is communicated with the medium outlet, a regulating groove extending downwards is formed in the top of the valve cage and is matched with the valve rod, a plurality of throttling holes penetrating transversely are formed in the inner wall of the regulating groove and are communicated with the annular flow guide cavity, a communicating groove extending upwards and is communicated with the regulating groove is formed in the bottom of the valve cage, a plurality of annular throttling cavities extending transversely are formed in the upper portion of the inner wall of the communicating groove, and the annular throttling cavities are arranged at equal intervals in the longitudinal direction;

an auxiliary valve body is arranged at the bottom of the main valve body, the auxiliary valve body and the main valve body are sealed, and a medium inlet which penetrates through the auxiliary valve body along the longitudinal direction is formed in the auxiliary valve body.

Furthermore, a pressure reducing plate is installed in the communication groove, the pressure reducing plate is matched with the communication groove and is located below the annular throttling cavity, and a plurality of pressure reducing holes penetrating in the longitudinal direction are formed in the pressure reducing plate.

Further, the auxiliary valve body is detachably connected with the main valve body.

Further, a sealing ring is arranged between the auxiliary valve body and the main valve body, and the sealing ring surrounds the outer side of the accommodating groove and is used for realizing sealing between the auxiliary valve body and the main valve body.

Further, the pressure reducing plate is in threaded connection with the inner wall of the communication groove.

The utility model has the beneficial effects that: according to the high-pressure-difference minimum flow regulating valve provided by the utility model, when the valve core assembly is opened, the medium can be decompressed and throttled by the plurality of annular throttling cavities and then is contacted with the sealing surface on the valve core assembly, so that the sealing surface on the valve core assembly cannot be excessively eroded by the medium, and the service life of the regulating valve is prolonged.

Drawings

FIG. 1 is a schematic front view of the present invention;

fig. 2 is a schematic diagram of the internal cross-sectional structure of the present invention.

Reference numerals: 10-main valve body, 11-accommodating groove, 12-medium outlet, 20-valve core assembly, 21-valve rod, 30-valve cage, 31-annular diversion cavity, 32-adjusting groove, 33-orifice, 34-communicating groove, 35-annular throttling cavity, 36-pressure reducing plate, 40-auxiliary valve body, 41-medium inlet and 42-sealing ring.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.

In this application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present application, it is to be understood that the terms "longitudinal," "lateral," "horizontal," "top," "bottom," "upper," "lower," "inner" and "outer" and the like refer to orientations and positional relationships illustrated in the drawings, which are used for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or components must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

As shown in fig. 1-2, the present invention provides a high pressure difference minimum flow regulating valve, which includes a main valve body 10 and a valve core assembly 20, wherein the valve core assembly 20 is installed on the main valve body 10, the valve core assembly 20 includes a valve rod 21, and the valve rod 21 can move up and down on the main valve body 10. The bottom of the main valve body 10 is provided with an upward extending accommodating groove 11, and the side wall of the accommodating groove 11 is provided with a medium outlet 12 which penetrates along the transverse direction.

A valve cage 30 is arranged in the accommodating groove 11, the valve cage 30 is adapted to the accommodating groove 11 and is in sliding connection with the inner wall of the accommodating groove 11, an annular flow guide cavity 31 is formed between the valve cage 30 and the main valve body 10, and the annular flow guide cavity 31 is communicated with the medium outlet 12. The top of the valve cage 30 is provided with a downwardly extending regulating groove 32, the regulating groove 32 is adapted to the valve rod 21, the inner wall of the regulating groove 32 is provided with a plurality of transversely penetrating throttling holes 33, and the throttling holes 33 are communicated with the annular diversion cavity 31. The bottom of the valve cage 30 is provided with a communication groove 34 which extends upwards and is communicated with the adjusting groove 32, the inner wall of the communication groove 34 is provided with a plurality of annular throttling cavities 35 which extend transversely, and the annular throttling cavities 35 are arranged at equal intervals along the longitudinal direction.

An auxiliary valve body 40 is mounted at the bottom of the main valve body 10, the auxiliary valve body 40 keeps a seal with the main valve body 10, and a medium inlet 41 penetrating through the auxiliary valve body 40 along the longitudinal direction is formed.

The valve core assembly 20 is far away from the medium inlet 41, when the valve core assembly 20 is opened, the valve rod 21 moves upwards, the medium in the medium inlet 41 is firstly decompressed and throttled by the annular throttle cavities 35 and then contacts with the sealing surface on the valve core assembly 20, and therefore the sealing surface on the valve core assembly 20 cannot be excessively eroded by the medium, and the service life of the regulating valve is prolonged. Then the medium continues to enter the regulating groove 32, is further throttled and decompressed by the decompression small hole, enters the annular diversion cavity 31, and finally flows out of the medium outlet 12.

According to the utility model, the medium is limited to the required flow through the annular throttling cavity 35 and the small throttling hole, and the medium is throttled and decompressed for multiple times when reaching the sealing surface of the valve core assembly 20, so that the medium flow rate at the sealing surface of the valve core assembly 20 is very low, the flushing is basically avoided, and the service life of the valve core is very long.

In one embodiment, a pressure reducing plate 36 is installed in the communication groove 34, the pressure reducing plate 36 is adapted to the communication groove 34 and located below the annular throttling chamber 35, and a plurality of pressure reducing holes penetrating in the longitudinal direction are formed in the pressure reducing plate 36. The pressure reducing plate 36 is designed to throttle the medium to reduce pressure before the medium enters the annular throttle chamber 35.

In one embodiment, secondary valve body 40 is removably coupled to main valve body 10. When the decompression assembly needs to be overhauled, the auxiliary valve body 40 can be detached by a worker, so that the accommodating groove 11 at the bottom of the main valve body 10 can be exposed, and the worker can directly take out the decompression assembly conveniently.

In one embodiment, a sealing ring 42 is disposed between the sub-valve body 40 and the main valve body 10, and the sealing ring 42 surrounds the outside of the receiving groove 11 for sealing between the sub-valve body 40 and the main valve body 10, so as to improve the sealing performance between the sub-valve body 40 and the main valve body 10.

In one embodiment, the pressure reduction plate 36 is threaded into the inner wall of the communication groove 34 to facilitate removal of the pressure reduction plate 36. The size of the pressure reducing holes on different pressure reducing plates 36 is different, and workers can change the pressure reducing plates 36 according to actual needs.

While there have been shown and described what are at present considered the fundamental principles and essential features of the utility model and its advantages, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A high differential pressure minimum flow control valve comprising a main valve body (10) and a spool assembly (20), the spool assembly (20) being mounted on the main valve body (10), the spool assembly (20) comprising a valve stem (21), characterized in that: the bottom of the main valve body (10) is provided with an accommodating groove (11) extending upwards, and the side wall of the accommodating groove (11) is provided with a medium outlet (12) penetrating along the transverse direction;

a valve cage (30) is arranged in the accommodating groove (11), the valve cage (30) is matched with the accommodating groove (11) and is in sliding connection with the inner wall of the accommodating groove (11), an annular flow guide cavity (31) is formed between the valve cage (30) and the main valve body (10), the annular flow guide cavity (31) is communicated with the medium outlet (12), a regulating groove (32) extending downwards is formed in the top of the valve cage (30), the regulating groove (32) is matched with the valve rod (21), a plurality of transversely-penetrating throttling holes (33) are formed in the inner wall of the regulating groove (32), the throttling holes (33) are communicated with the annular flow guide cavity (31), an upwardly-extending communicating groove (34) communicated with the regulating groove (32) is formed in the bottom of the valve cage (30), a plurality of transversely-extending annular throttling cavities (35) are formed in the upper portion of the inner wall of the communicating groove (34), a plurality of the annular throttling cavities (35) are arranged at equal intervals along the longitudinal direction;

an auxiliary valve body (40) is installed at the bottom of the main valve body (10), the auxiliary valve body (40) and the main valve body (10) are sealed, and a medium inlet (41) penetrating along the longitudinal direction is formed in the auxiliary valve body (40).

2. The high differential pressure minimum flow control valve of claim 1, wherein: a pressure reducing plate (36) is arranged in the communicating groove (34), the pressure reducing plate (36) is adapted to the communicating groove (34) and is positioned below the annular throttling cavity (35), and a plurality of pressure reducing holes penetrating in the longitudinal direction are formed in the pressure reducing plate (36).

3. A high differential pressure minimum flow control valve as defined in claim 2, wherein: the auxiliary valve body (40) is detachably connected with the main valve body (10).

4. A high differential pressure minimum flow control valve as defined in claim 1, wherein: a sealing ring (42) is arranged between the auxiliary valve body (40) and the main valve body (10), and the sealing ring (42) surrounds the outer side of the accommodating groove (11) and is used for realizing sealing between the auxiliary valve body (40) and the main valve body (10).

5. A high differential pressure minimum flow control valve as defined in claim 3, wherein: the pressure reducing plate (36) is in threaded connection with the inner wall of the communication groove (34).