Pressure regulating valve

Abstract

The utility model relates to a pressure regulating valve which comprises a control cavity and a valve, the opening degree of the valve is changed according to the water pressure in the control cavity, the pressure regulating valve further comprises a control cavity pressure mechanism, a pressure reducing mechanism and a pressure stabilizing mechanism, and the input end of the control cavity is connected with the input end of the valve through the control cavity pressure mechanism. The output end of the control cavity is connected with the output end of the valve through the pressure reducing mechanism, and the pressure stabilizing mechanism is connected with the control cavity and the input end of the valve. Compared with the prior art, the external control pipeline of the pressure regulating valve respectively controls the opening degree of the valve through the pilot valve according to the change of the upstream pressure, so that the downstream pressure reaches a required stable value, and water resources can be reasonably distributed according to the pipeline pressure.

Description

Technical Field

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

[0002] In the water supply system, pipeline pressure and flow are usually supplied at the maximum daily amount. At the maximum usage, it is hoped that the water loss of the equipment on the pipeline is as small as possible to save resources, the water volume used reaches the peak, and the pressure regulating valve does not reduce pressure. However, during the low-peak period, the water consumption will decrease, and the inlet end of the valve will have a very high static pressure. At this time, the valve needs to realize the function of a pressure reducing valve to ensure the stability of the pressure after the valve and protect the equipment on the downstream pipeline. The pressure reducing valves currently used must reduce pressure at any time, and it is difficult to switch between the peak and low-peak periods of water consumption. Utility Model Content

[0003] The purpose of the utility model is to provide a pressure regulating valve in order to overcome the defects of the prior art.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A pressure regulating valve comprises a control chamber and a valve whose opening changes according to the water pressure in the control chamber. The pressure regulating valve also comprises a control chamber pressure mechanism, a pressure reducing mechanism and a pressure stabilizing mechanism. The input end of the control chamber is connected to the input end of the valve through the control chamber pressure mechanism, the output end of the control chamber is connected to the output end of the valve through the pressure reducing mechanism, and the pressure stabilizing mechanism is respectively connected to the control chamber and the input end of the valve.

[0006] Furthermore, the control chamber pressure mechanism includes a high-pressure pilot valve PV1, a needle valve NV1, a first pressure gauge P1 and a ball valve BV1; one end of the high-pressure pilot valve PV1 is connected to the control chamber through the needle valve NV1, and the other end is connected to the valve input end; the first pressure gauge P1 is connected to the connecting line between the high-pressure pilot valve PV1 and the valve input end through the first ball valve BV1, and is used to measure the front end pressure of the valve.

[0007] Furthermore, when the front end pressure of the valve is higher than the high pressure setting value of the high pressure pilot valve PV1, the high pressure pilot valve PV1 opens to pass water into the control chamber and reduce the valve opening until the front end pressure of the valve drops to the high pressure setting value.

[0008] Furthermore, the control chamber pressure mechanism further comprises a filter ST, and the filter ST is located in the connection line between the high-pressure pilot valve PV1 and the valve input end.

[0009] Furthermore, the pressure stabilizing mechanism comprises a low-pressure pilot valve PV3 and a fourth ball valve BV4, one end of the low-pressure pilot valve PV3 is connected to the valve input end, and the other end is connected to the control chamber through the fourth ball valve BV4.

[0010] Furthermore, when the pressure at the valve input end is lower than the low pressure setting value of the low pressure pilot valve PV3, the low pressure pilot valve PV3 opens, and the water in the control chamber is discharged from the low pressure pilot valve PV3, so that the valve opens until the front end pressure of the valve rises to the low pressure setting value.

[0011] Furthermore, the pressure reducing mechanism includes a pressure reducing pilot valve PV2, a check valve CV, a third ball valve BV3, a second pressure gauge P2 and a second ball valve BV2. One end of the pressure reducing pilot valve PV2 is connected to the control chamber, and the other end is connected to the valve output end through the check valve CV and the third ball valve BV3. The check valve CV prevents the water after the valve from flowing into the control chamber 2 and affecting the pressure in the control chamber. The second pressure gauge P2 is connected to the connecting line between the third ball valve BV3 and the valve output end through the second ball valve BV2 and is used to measure the outlet pressure of the valve.

[0012] Furthermore, when the outlet pressure of the valve is higher than the set value of the pressure reducing pilot valve PV2, the opening of the pressure reducing pilot valve PV2 decreases, the water in the control chamber increases, and the valve opening decreases; when the outlet pressure of the valve is lower than the set value of the pressure reducing pilot valve PV2, the opening of the pressure reducing pilot valve PV2 increases, the water in the control chamber decreases, and the valve opening increases.

[0013] Furthermore, the control chamber and the valve are separated by a diaphragm.

[0014] Furthermore, the input end of the valve is connected to the pipeline, and the output end is connected to the downstream pipeline.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] (1) The external control pipeline of the pressure regulating valve of the utility model controls the valve opening through the pilot valve according to the change of the pressure before the valve, so that the pressure after the valve reaches the required stable value. When the water volume is large and the inlet pressure is low, the water in the control chamber is discharged through the low-pressure pilot valve PV3, so that the valve is fully opened without reducing the pressure, and the water loss of the valve is minimized; when the water volume is small and the inlet pressure is high, water is passed to the control chamber through the high-pressure pilot valve PV1 to reduce the valve opening; the pressure reducing pilot valve PV2 set at the output end of the valve can automatically sense the pipeline pressure to control the pressure after the valve, and can reasonably distribute water resources according to the pipeline pressure. The traditional pilot-operated pressure reducing valve needs to maintain a pressure difference of more than 0.15MPa to ensure that the outlet pressure reaches the set value. The adjustment and use mode is relatively simple and inflexible, and the use occasions are relatively limited.

[0017] (2) The utility model adjusts the pressure in the control chamber of the main valve by means of a control chamber pressure mechanism, a pressure stabilizing mechanism and a pressure reducing mechanism, thereby achieving control of the opening of the main valve and realizing that the pressure after the valve reaches the required set value.

[0018] (3) The control chamber pressure mechanism of the utility model can set the opening pressure of the high-pressure pilot valve and the set value of the low-pressure pilot valve according to actual needs. The pressure at the valve outlet is controlled by the high-pressure pilot valve and the pressure-reducing pilot valve to a stable set value, which can fully and reasonably utilize water resources and protect equipment on the downstream pipeline.

[0019] (4) The high-pressure pilot valve in the control chamber pressure mechanism of the utility model controls its own opening and closing by sensing the pressure before the valve, thereby supplying water to the valve control chamber and cutting off the water supply, further realizing the opening and closing of the automatic pressure regulating valve.

[0020] (5) The pressure reducing pilot valve in the pressure reducing mechanism of the utility model realizes its own opening and closing by sensing the pressure behind the valve, thereby outputting water to the upper chamber of the valve and cutting off the output water, further realizing the opening and closing of the automatic pressure regulating valve.

[0021] (6) The low-pressure pilot valve in the pressure-stabilizing mechanism of the utility model drives the valve to open and close by sensing the pressure in front of the valve, thereby realizing drainage and stopping of drainage in the control chamber, and further realizing the opening and closing of the automatic pressure regulating valve.

[0022] (7) The utility model provides a filter between the high-pressure pilot valve and the valve input end, thereby avoiding the failure of the high-pressure pilot valve and the needle valve of the water pressure control component due to blockage caused by water quality problems, thereby causing the entire automatic pressure regulating valve to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural schematic diagram of a pressure regulating valve provided in an embodiment of the utility model;

[0024] In the figure, 1. control chamber pressure mechanism, 2. control chamber, 3. pressure reducing mechanism, 4. pressure stabilizing mechanism. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a pressure regulating valve, the input end of the pressure regulating valve is connected to the upstream pipeline, and the output end is connected to the downstream water pipeline, including a main valve, the main valve includes a control chamber 2 and a valve whose opening changes according to the water pressure in the control chamber 2, the control chamber and the valve are separated by a diaphragm, the pressure regulating valve also includes an external control pipeline of the main valve, and the pipeline is provided with a high-pressure pilot valve, a low-pressure pilot valve and a pressure reducing pilot valve for controlling the opening and closing of the valve.

[0031] The external control pipeline of the main valve of the pressure regulating valve controls the valve opening according to the changes in the pressure before and after the valve, so as to achieve the required stable value of the pressure after the valve. When the water volume is large and the inlet pressure is low, the valve can still remain fully open, that is, the valve does not reduce pressure.

[0032] Specifically, the external control pipeline of the main valve includes a control chamber pressure mechanism 1, a pressure reducing mechanism 3 and a pressure stabilizing mechanism 4. The input end of the control chamber 2 is connected to the valve input end through the control chamber pressure mechanism 1, and the output end of the control chamber 2 is connected to the valve output end through the pressure reducing mechanism 3. The pressure stabilizing mechanism 4 is respectively connected to the control chamber 2 and the valve input end.

[0033] The control chamber pressure mechanism 1 includes a high-pressure pilot valve PV1, a needle valve NV1, a first pressure gauge P1 and a ball valve BV1. One end of the high-pressure pilot valve PV1 is connected to the control chamber 2 through the needle valve NV1, and the other end is connected to the valve input end; the first pressure gauge P1 is connected to the connecting line between the high-pressure pilot valve PV1 and the valve input end through the first ball valve BV1, and is used to measure the front end pressure of the valve.

[0034] That is, the input end of the control chamber 2 is connected to the valve inlet through the filter ST, the high-pressure pilot valve PV1, the needle valve NV1, the ball valve BV1, and the pressure gauge P1 to form a loop.

[0035] When the front-end pressure of the valve is higher than the high-pressure setting value of the high-pressure pilot valve PV1, the high-pressure pilot valve PV1 opens to pass water into the upper chamber of the MV main valve, reducing the valve opening, so that the pressure behind the automatic pressure regulating valve reaches the set value, that is, the pressure reducing function is realized.

[0036] When the front-end pressure of the valve is lower than the high-pressure setting value of the high-pressure pilot valve PV1, the high-pressure pilot valve PV1 is closed and water stops flowing into the upper chamber of the main valve MV.

[0037] The pressure stabilizing mechanism 4 comprises a low-pressure pilot valve PV3 and a fourth ball valve BV4. One end of the low-pressure pilot valve PV3 is connected to the valve input end, and the other end is connected to the control chamber 2 through the fourth ball valve BV4.

[0038] When the pressure at the valve input end is lower than the low pressure setting value of the low pressure pilot valve PV3, the low pressure pilot valve PV3 opens, and the water in the control chamber 2 is discharged from the low pressure pilot valve PV3, so that the valve MV opens until the pressure at the front end of the valve rises to the low pressure setting value. The pressure before and after the automatic pressure regulating valve is almost balanced without pressure reduction. The pressure reduction and non-pressure reduction functions are achieved according to the change of the pressure before the valve, and the limited water resources of the pipeline are utilized to the maximum extent.

[0039] The pressure reducing mechanism 3 includes a pressure reducing pilot valve PV2, a check valve CV, a third ball valve BV3, a second pressure gauge P2 and a second ball valve BV2. One end of the pressure reducing pilot valve PV2 is connected to the control chamber 2, and the other end is connected to the valve output end through the check valve CV and the third ball valve BV3. The check valve CV prevents the water after the valve from flowing into the control chamber 2 and affecting the pressure in the control chamber. The second pressure gauge P2 is connected to the connection line between the third ball valve BV3 and the valve output end through the second ball valve BV2 to measure the outlet pressure of the valve.

[0040] That is, the output port end of the control chamber 2 forms a loop with the valve outlet end through the pressure reducing pilot valve PV2, the ball valve BV3, the pressure gauge P2, the ball valve BV2 and the valve outlet end.

[0041] The outlet pressure of the pressure reducing valve is determined by setting the set value of the pressure reducing pilot valve PV2, and the set value of the pressure reducing pilot valve PV2 is recorded by the pressure gauge P2.

[0042] When the outlet pressure of the valve is higher than the set value of the pressure reducing pilot valve PV2, the opening of the pressure reducing pilot valve PV2 decreases, the water in the control chamber 2 increases, and the valve opening decreases; when the outlet pressure of the valve is lower than the set value of the pressure reducing pilot valve PV2, the opening of the pressure reducing pilot valve PV2 increases, the water in the control chamber 2 decreases, and the valve opening increases. Thus, the pressure after the automatic pressure regulating valve is stabilized at the set value, and the function of the pressure change after the valve is not affected by the change of the water consumption after the valve.

[0043] When setting the set value of the high-pressure pilot valve PV1 and the low-pressure pilot valve PV3, the set value can be recorded through the first pressure gauge P1. When setting the set value of the pressure reducing valve pilot valve PV2, the set value can be recorded through the second pressure gauge P2.

[0044] Preferably, the control chamber pressure mechanism 1 also includes a filter ST, which is located in the connection line between the high-pressure pilot valve PV1 and the valve input end, thereby avoiding failure of the high-pressure pilot valves PV1 and NV1 caused by blockage of the pressure relief pilot valve PV1 and the needle valve NV1 of the water pressure control component due to water quality problems, thereby causing failure of the entire automatic pressure regulating valve.

[0045] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A pressure regulating valve, comprising a control chamber (2) and a valve whose opening varies according to the water pressure in the control chamber (2), characterized in that: The pressure regulating valve further comprises a control chamber pressure mechanism (1), a pressure reducing mechanism (3) and a pressure stabilizing mechanism (4); the input end of the control chamber (2) is connected to the valve input end via the control chamber pressure mechanism (1); the output end of the control chamber (2) is connected to the valve output end via the pressure reducing mechanism (3); and the pressure stabilizing mechanism (4) is respectively connected to the control chamber (2) and the valve input end; The pressure stabilizing mechanism (4) comprises a low-pressure pilot valve PV3 and a fourth ball valve BV4, one end of the low-pressure pilot valve PV3 is connected to the valve input end, and the other end is connected to the control chamber (2) through the fourth ball valve BV4; When the pressure at the valve input end is lower than the low pressure setting value of the low pressure pilot valve PV3, the low pressure pilot valve PV3 opens, and the water in the control chamber (2) is discharged from the low pressure pilot valve PV3, so that the valve opens until the pressure at the front end of the valve rises to the low pressure setting value.

2. A pressure regulating valve according to claim 1, characterized in that: The control chamber pressure mechanism (1) comprises a high-pressure pilot valve PV1, a needle valve NV1, a first pressure gauge P1 and a ball valve BV1; one end of the high-pressure pilot valve PV1 is connected to the control chamber (2) via the needle valve NV1, and the other end is connected to the valve input end; the first pressure gauge P1 is connected to the connection line between the high-pressure pilot valve PV1 and the valve input end via the first ball valve BV1, and is used to measure the front end pressure of the valve.

3. A pressure regulating valve according to claim 2, characterized in that: When the pressure at the front end of the valve is higher than the high pressure setting value of the high pressure pilot valve PV1, the high pressure pilot valve PV1 opens to pass water into the control chamber (2) and reduce the valve opening until the pressure at the front end of the valve drops to the high pressure setting value.

4. A pressure regulating valve according to claim 2, characterized in that: The control chamber pressure mechanism (1) further comprises a filter ST, which is located in the connection line between the high-pressure pilot valve PV1 and the valve input end.

5. A pressure regulating valve according to claim 1, characterized in that: The pressure reducing mechanism (3) comprises a pressure reducing pilot valve PV2, a check valve CV, a third ball valve BV3, a second pressure gauge P2 and a second ball valve BV2; one end of the pressure reducing pilot valve PV2 is connected to the control chamber (2), and the other end is connected to the valve output end via the check valve CV and the third ball valve BV3; the second pressure gauge P2 is connected to the connection line between the third ball valve BV3 and the valve output end via the second ball valve BV2, and is used to measure the outlet pressure of the valve.

6. A pressure regulating valve according to claim 5, characterized in that: When the outlet pressure of the valve is higher than the set value of the pressure reducing pilot valve PV2, the opening of the pressure reducing pilot valve PV2 decreases, and the water in the control chamber (2) increases, so that the valve opening decreases; when the outlet pressure of the valve is lower than the set value of the pressure reducing pilot valve PV2, the opening of the pressure reducing pilot valve PV2 increases, and the water in the control chamber (2) decreases, so that the valve opening increases.

7. A pressure regulating valve according to claim 1, characterized in that: The control chamber (2) is separated from the valve by a diaphragm.

8. The pressure regulating valve according to claim 1, characterized in that: The input end of the valve is connected to the pipeline, and the output end is connected to the downstream pipeline.

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