Differential pressure adjusting control valve

Abstract

The utility model relates to the technical field of valves, in particular to a pressure difference adjusting control valve which comprises a valve body, a valve core rod perpendicular to the flow direction of media is connected in an inner cavity of the valve body, a valve clack connected with a valve body hole in a movable fit mode is connected to the valve core rod, the bottom end of the valve core rod is connected with a spring, and the bottom end of the valve core rod is connected with a pressure sensing diaphragm. The periphery of the pressure sensing diaphragm is connected to the top of the valve body in an embedded mode, the pressure sensing diaphragm and the valve clack divide an inner cavity of the valve body into a water inlet side pressure branch cavity, a water outlet side pressure branch cavity and a diaphragm top side pressure branch cavity, and a pressure difference adjusting device connected with the diaphragm top side pressure branch cavity and the water inlet side pressure branch cavity is installed on the side body portion of the valve body in a connected mode. The top of the valve body is provided with a pressure guide pipe communicated with the pressure branch cavity on the top side of the diaphragm. The pressure control valve is novel in structure, simple in construction, low in cost, economical, practical, high in pressure difference control precision, large in adjusting range, wide in application range and easy and convenient to operate and use.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pressure difference regulating control valve. Background Art

[0002] The differential pressure control valve does not require any external energy, and relies on the pressure changes of the regulated medium to automatically adjust, automatically eliminate the residual pressure head of the pipeline network and the flow changes caused by pressure fluctuations, and maintain a constant user inlet and outlet pressure difference. It is particularly suitable for household metering or automatic control systems. In order to ensure the safe and stable operation of the pipeline network, it is usually necessary to install a differential pressure control valve in the return pipeline. The existing differential pressure control valve mainly adopts a main valve composed of a valve body, a valve cover, a valve seat, a valve stem, a valve disc, a diaphragm, a pressure plate, a spring, a sealing ring, a gasket and other components. It has a complex structure, high cost, and cumbersome processing and installation operations. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a pressure difference regulating control valve which has a simple structure, low cost and is easy to operate and use.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure differential regulating control valve, comprising a valve body, a valve core rod perpendicular to the medium flow direction is installed in the inner cavity of the valve body, a valve disc which is movably connected to the valve body hole is installed on the valve core rod, a spring and a pressure-sensitive diaphragm are respectively connected to the bottom and bottom ends of the valve core rod, the periphery of the pressure-sensitive diaphragm is embedded in the top of the valve body, the pressure-sensitive diaphragm and the valve disc divide the inner cavity of the valve body into a water inlet side pressure chamber, a water outlet side pressure chamber and a diaphragm top side pressure chamber, the side body of the valve body is equipped with a pressure differential regulating device connecting the diaphragm top side pressure chamber and the water inlet side pressure chamber, and a pressure-conducting pipe connecting the diaphragm top side pressure chamber is installed on the top of the valve body.

[0007] Preferably, the pressure difference regulating device is configured as an adjustable flow valve.

[0008] Preferably, the spring is fixedly connected to the valve core rod via a spring sleeve.

[0009] Preferably, a limit baffle is fixedly connected to the valve core rod.

[0010] Preferably, a sealing gasket is provided at the connection between the pressure difference regulating device and the valve body.

[0011] Preferably, it also includes a sealing base, which is threadedly connected to the bottom of the valve body, and the bottom end of the spring is connected to the sealing base.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model provides a pressure difference regulating control valve, which has the following beneficial effects:

[0014] The differential pressure regulating control valve adopts a new structure of a self-operated differential pressure control valve. In particular, the upper and lower pressures of the diaphragm of the differential pressure valve are synchronized with the differential pressure signals at both ends of the controlled system, and the differential pressure adjustment range is 0.01-0.2MPa. The differential pressure regulating control valve is an energy-saving product that uses the pressure change of the medium itself to perform self-control and keep the differential pressure of the medium flowing through the controlled system unchanged. It is suitable for differential pressure control of a double-pipe system in a heating mode, ensuring that the system's differential pressure remains basically unchanged, reducing noise, balancing resistance, and eliminating hydraulic imbalance in the heating network. The differential pressure regulating control valve has a novel structure, simple construction, low cost, economy and practicality, high differential pressure control accuracy, a large adjustment range, a wide range of applications, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the overall partial section of the utility model;

[0016] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0017] Markings in the attached drawing: 1. valve body; 2. valve core rod; 3. valve disc; 4. spring; 5. pressure-sensitive diaphragm; 6. pressure chamber on the water inlet side; 7. pressure chamber on the water outlet side; 8. pressure chamber on the top side of the diaphragm; 9. pressure difference regulating device; 10. spring sleeve; 11. limit baffle; 12. sealing gasket; 13. sealing base; 14. pressure guiding pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example:

[0020] See also Figure 1-2, a pressure differential regulating control valve comprises a valve body 1, in the inner cavity of the valve body 1 is connected a valve core rod 2 which is perpendicular to the flow direction of the medium, on the valve core rod 2 is connected a valve disc 3 which is movably connected to the hole of the valve body 1, the bottom end and the bottom end of the valve core rod 2 are respectively connected with a spring 4 and a pressure-sensitive diaphragm 5, the periphery of the pressure-sensitive diaphragm 5 is embedded in the top of the valve body 1, the pressure-sensitive diaphragm 5 and the valve disc 3 divide the inner cavity of the valve body 1 into a water inlet side pressure chamber 6, a water outlet side pressure chamber 7 and a diaphragm top side pressure chamber 8, the side body of the valve body 1 is connected with a pressure differential regulating device 9 which connects the diaphragm top side pressure chamber 8 and the water inlet side pressure chamber 6, the top of the valve body 1 is provided with a pressure guiding pipe 14 which communicates with the diaphragm top side pressure chamber 8, further, the water inlet side pressure chamber 6 and the water outlet side pressure chamber 7 are respectively provided with a water inlet and a water outlet.

[0021] Specifically, the pressure difference regulating device 9 is configured as an adjustable flow valve for controlling the flow rate.

[0022] Specifically, the spring 4 is fixedly connected to the valve core rod 2 via a spring 4 sleeve, which is convenient for installation.

[0023] Specifically, a limit baffle 11 is fixedly connected to the valve core rod 2 to facilitate limiting and increase the stability of the structure.

[0024] Specifically, a sealing gasket 12 is provided at the connection between the pressure difference regulating device 9 and the valve body 1 to improve the sealing performance.

[0025] Specifically, it also includes a sealing base 13, which is threadedly connected to the bottom of the valve body 1, and the bottom end of the spring 4 is connected to the sealing base 13, which is convenient for processing and installation.

[0026] When in use, the outlet of the pressure differential regulating control valve is connected to the return pipe at the outlet of the thermal inlet device, the water inlet is connected to the return pipe behind the controlled system, and the pressure pipe 14 is connected to the water supply pipe at the thermal inlet device of the external network. When the water supply pressure increases or decreases, the pressure signal is transmitted from the pressure pipe 14 to the pressure sub-chamber 8 on the top side of the diaphragm, so that the pressure-sensitive diaphragm 5 drives the valve core rod 2 together with the valve disc 3 to move downward or upward, and the flow area in the valve body 1 is reduced or increased, and the pressure differential is adjusted to restore and keep the original value constant; when the return pipe pressure increases or decreases, the pressure flowing through the valve body 1 is The flow rate of the water outlet decreases or increases, and the pressure of the outlet side pressure chamber 7 also increases or decreases in an instant until the chamber pressures of the inlet side pressure chamber 6 and the outlet side pressure chamber 7 on both sides of the pressure-sensitive diaphragm 5 are balanced again, and the controlled pressure difference is restored to remain constant at the original value; when the resistance of the controlled system decreases or increases, the valve disc 3 is driven to move up or down, and the flow area in the valve body 1 increases or decreases, causing the pressure in the rear pipe of the controlled system to decrease or increase, and the working pressure difference of the pressure differential regulating control valve also decreases or increases accordingly, until the controlled pressure difference is restored to remain constant at the original value.

[0027] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0028] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0029] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0030] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pressure differential regulating control valve, characterized in that: The invention comprises a valve body (1), wherein a valve core rod (2) perpendicular to the flow direction of the medium is installed in the inner cavity of the valve body (1), a valve disc (3) movably connected to the hole of the valve body (1) is installed on the valve core rod (2), the bottom end and the bottom end of the valve core rod (2) are respectively connected to a spring (4) and a pressure-sensitive diaphragm (5), the periphery of the pressure-sensitive diaphragm (5) is embedded in the top of the valve body (1), the pressure-sensitive diaphragm (5) and the valve disc (3) divide the inner cavity of the valve body (1) into a water inlet side pressure chamber (6), a water outlet side pressure chamber (7) and a diaphragm top side pressure chamber (8), the side body of the valve body (1) is installed with a pressure difference regulating device (9) connecting the diaphragm top side pressure chamber (8) and the water inlet side pressure chamber (6), and the top of the valve body (1) is installed with a pressure guide pipe (14) communicating with the diaphragm top side pressure chamber (8); The valve core rod (2) is fixedly connected to a limit baffle (11).

2. The differential pressure regulating control valve according to claim 1, characterized in that: The pressure difference regulating device (9) is configured as an adjustable flow valve.

3. The differential pressure regulating control valve according to claim 2, characterized in that: The spring (4) is fixedly connected to the valve core rod (2) via a spring (4) sleeve.

4. The differential pressure regulating control valve according to claim 3, characterized in that: A sealing gasket (12) is provided at the connection between the pressure difference regulating device (9) and the valve body (1).

5. The differential pressure regulating control valve according to claim 4, characterized in that: It also comprises a sealing base (13), wherein the sealing base (13) is threadedly connected to the bottom of the valve body (1), and the bottom end of the spring (4) is connected to the sealing base (13).

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