Pressure reducing valve

Abstract

The utility model relates to the technical field of pressure reducing valves, in particular to a pressure reducing valve which comprises a pressure reducing valve body, and a pressure regulating mechanism is arranged at the upper end in the pressure reducing valve body. An opening and closing mechanism is arranged in the middle of the inner side of the pressure reducing valve body; and an anti-backflow mechanism is arranged on the right side in the pressure reducing valve body. The fixing ring, the sealing ring, the plugging disc and the third spring are used in cooperation, when fluid downwards presses the valve clack and then flows into the right side of the pressure reducing valve body, the fluid penetrates through the middle of the sealing ring to push the plugging disc, and after the plugging disc is pushed out of the right side of the fixing ring, the fluid can flow out of the right side of the pressure reducing valve body; when fluid stops entering from the left side of the pressure reducing valve body, due to the pressure difference between the left side and the right side of the pressure reducing valve body, the blocking disc can be contained in the fixing ring to block the channel, and therefore the purpose of preventing backflow can be achieved.

Description

Technical Field

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

[0002] A pressure reducing valve is a device used to control fluid pressure. It is usually used in pipeline systems or equipment to ensure that the fluid flows in the pipeline at a safe and constant pressure. The pressure reducing valve adjusts the pressure by adjusting the cross-sectional area of ​​the fluid passing through the valve. When the fluid pressure exceeds the set value, the pressure reducing valve will automatically adjust the valve opening to reduce the fluid pressure.

[0003] If the pressure difference that the pressure reducing valve needs to adjust is too large and exceeds the set range, then after the pressure reducing valve is closed, the high-pressure fluid in the upstream of the pipeline may flow back to the low-pressure side, causing reflux. If the valve fails to seal completely when the pressure reducing valve is closed, even if the pressure reducing valve is in the closed state, part of the fluid may flow back to the low-pressure side. Utility Model Content

[0004] The purpose of the utility model is to provide a pressure reducing valve to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A pressure reducing valve comprising

[0007] A pressure reducing valve body, wherein a pressure regulating mechanism is provided at the inner upper end of the pressure reducing valve body;

[0008] An opening and closing mechanism is provided in the middle of the inner side of the pressure reducing valve body;

[0009] A backflow prevention mechanism is arranged on the right side inside the pressure reducing valve body.

[0010] Preferably, the pressure regulating mechanism comprises an adjusting seat, the adjusting seat is movably mounted on the inner upper end of the pressure reducing valve body, a first screw is movably mounted on the middle of the top end of the pressure reducing valve body, an output shaft of the first screw is threadedly connected to the middle of the adjusting seat, and a first adjusting disk is arranged on the top end of the first screw;

[0011] Preferably, the pressure regulating mechanism further comprises a diaphragm, the diaphragm is arranged below the pressure reducing valve body near the adjusting seat, a pressure plate is movably mounted on the upper end of the diaphragm, the pressure plate and the adjusting seat are movably mounted via a second spring, and a through groove is penetrated through the upper right end of the pressure reducing valve body;

[0012] Preferably, the opening and closing mechanism includes a valve flap, which is movably mounted on the middle part of the inner side of the pressure reducing valve body, and the bottom end of the valve flap is movably connected to the inner lower part of the pressure reducing valve body through a first spring;

[0013] Preferably, the opening and closing mechanism further comprises a second screw rod, the second screw rod is movably mounted at the middle of the bottom end of the pressure reducing valve body, and a second adjusting disk is fixedly mounted at the bottom end of the second screw rod;

[0014] Preferably, the anti-backflow mechanism includes a fixing ring, which is arranged on the right side of the interior of the pressure reducing valve body, a sealing ring is arranged on the side of the fixing ring close to the valve disc, a blocking disk is movably installed inside the other side of the fixing ring, and a third spring is arranged between the blocking disk and the sealing ring.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] This kind of pressure reducing valve is used in cooperation with a fixing ring, a sealing ring, a blocking disk and a third spring. When the fluid presses down the valve disc and flows into the right side of the pressure reducing valve body, the fluid passes through the middle of the sealing ring and pushes the blocking disk. After the blocking disk is pushed out from the right side of the fixing ring, the fluid can flow out from the right side of the pressure reducing valve body. When the fluid stops entering from the left side of the pressure reducing valve body, due to the pressure difference between the left and right sides of the pressure reducing valve body, the blocking disk will be retracted into the fixing ring to block the passage, thereby preventing backflow.

[0017] The pressure reducing valve is used in combination with a pressure reducing valve body, a valve disc, a first spring, a second screw and a second adjusting disk. When in use, the valve can also control the opening and closing degree of the valve disc. During control, the second screw at the middle of the bottom end of the pressure reducing valve body is rotated, and the second screw drives the end to rise. The distance of the valve disc's descent is limited by adjusting the distance between the end of the second screw and the valve disc, thereby controlling the flow rate of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall main structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0020] Figure 3 For the utility model Figure 2 The enlarged schematic diagram at A in the middle;

[0021] Figure 4 For the utility model Figure 2 Enlarged schematic diagram of point B in the middle.

[0022] In the figure: 1. pressure reducing valve body; 2. adjusting seat; 3. first screw; 4. diaphragm; 5. pressure plate; 6. second spring; 7. groove; 8. valve disc; 9. first spring; 10. second screw; 11. second adjusting plate; 12. first adjusting plate; 13. fixing ring; 14. sealing ring; 15. blocking plate; 16. third spring. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1 and Figure 2 As shown, a technical solution provided by the utility model:

[0025] A pressure reducing valve, comprising a pressure reducing valve body 1, a pressure regulating mechanism is arranged at the inner upper end of the pressure reducing valve body 1, the pressure regulating mechanism comprises an adjusting seat 2, the adjusting seat 2 is movably mounted at the inner upper end of the pressure reducing valve body 1, a first screw 3 is movably mounted at the middle of the top end of the pressure reducing valve body 1, the output shaft of the first screw 3 is threadedly connected to the middle of the adjusting seat 2, a first adjusting disk 12 is arranged at the top end of the first screw 3, the pressure regulating mechanism further comprises a diaphragm 4, the diaphragm 4 is arranged below the pressure reducing valve body 1 close to the adjusting seat 2, a pressure plate 5 is movably mounted at the upper end of the diaphragm 4, the pressure plate 5 and the adjusting seat 2 are movably mounted via a second spring 6, and a through groove 7 is penetrated and opened at the upper right end of the pressure reducing valve body 1;

[0026] In this embodiment, when the valve is in use, the fluid enters from the left side of the pressure reducing valve body 1, and the fluid presses down the valve flap 8, causing the valve flap 8 to drop and open, and the fluid passes through the middle of the pressure reducing valve body 1 and flows out from the right side. If the pressure is too high, part of the fluid enters the upper end of the pressure reducing valve body 1 from the groove 7, and then lifts the diaphragm 4, which can play a role in pressure regulation.

[0027] like Figure 2 and Figure 3 As shown, an opening and closing mechanism is provided in the middle of the inner side of the pressure reducing valve body 1, and the opening and closing mechanism includes a valve flap 8, which is movably mounted in the middle of the inner side of the pressure reducing valve body 1, and the bottom end of the valve flap 8 is movably connected to the lower part of the inner side of the pressure reducing valve body 1 through a first spring 9, and the opening and closing mechanism also includes a second screw rod 10, which is movably mounted in the middle of the bottom end of the pressure reducing valve body 1, and a second adjusting disk 11 is fixedly mounted on the bottom end of the second screw rod 10;

[0028] In this embodiment, when the valve is in use, the opening and closing degree of the valve flap 8 can also be controlled. During control, the second screw 10 at the middle of the bottom end of the pressure reducing valve body 1 is rotated, and the second screw 10 drives the end to rise. By adjusting the distance between the end of the second screw 10 and the valve flap 8 to limit the descending distance of the valve flap 8, the flow rate of the fluid can be controlled.

[0029] like Figure 2 and Figure 4 As shown, a backflow prevention mechanism is provided on the right side of the interior of the pressure reducing valve body 1, and the backflow prevention mechanism includes a fixing ring 13, which is provided on the right side of the interior of the pressure reducing valve body 1, and a sealing ring 14 is provided on one side of the fixing ring 13 close to the valve disc 8, and a blocking disk 15 is movably installed inside the other side of the fixing ring 13, and a third spring 16 is provided between the blocking disk 15 and the sealing ring 14;

[0030] In this embodiment, when the fluid presses down the valve disc 8 and flows into the right side of the pressure reducing valve body 1, the fluid passes through the middle of the sealing ring 14 and pushes the blocking plate 15. After the blocking plate 15 is pushed out from the right side of the fixing ring 13, the fluid can flow out from the right side of the pressure reducing valve body 1. When the fluid stops entering from the left side of the pressure reducing valve body 1, due to the pressure difference between the left and right sides of the pressure reducing valve body 1, the blocking plate 15 will be retracted into the fixing ring 13 to block the passage, thereby preventing backflow.

[0031] Working principle: When the valve is in use, the fluid enters from the left side of the pressure reducing valve body 1, and the fluid presses down the valve disc 8, causing the valve disc 8 to drop and open, and the fluid passes through the middle part of the pressure reducing valve body 1 and flows out from the right side. If the pressure is too high, part of the fluid enters the upper end of the pressure reducing valve body 1 from the groove 7, and then lifts the diaphragm 4. When the valve is in use, the opening and closing degree of the valve disc 8 can also be controlled. During control, the second screw 10 in the middle of the bottom end of the pressure reducing valve body 1 is rotated, and the second screw 10 drives the end head to rise. The distance between the end head of the second screw 10 and the valve disc 8 is adjusted to limit the descending distance of the valve disc 8. When the fluid presses down the valve disc 8 and flows into the right side of the pressure reducing valve body 1, the fluid passes through the middle part of the sealing ring 14 and pushes the blocking disk 15. After the blocking disk 15 is pushed out from the right side of the fixing ring 13, the fluid can flow out from the right side of the pressure reducing valve body 1. When the fluid stops entering from the left side of the pressure reducing valve body 1, due to the pressure difference between the left and right sides of the pressure reducing valve body 1, the blocking disk 15 will be retracted into the fixing ring 13 to block the passage.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A pressure reducing valve, characterized in that: include A pressure reducing valve body (1), wherein a pressure regulating mechanism is provided at the upper end of the interior of the pressure reducing valve body (1); An opening and closing mechanism is provided in the middle of the inner side of the pressure reducing valve body (1); A backflow prevention mechanism is provided on the right side of the interior of the pressure reducing valve body (1); The pressure regulating mechanism comprises an adjusting seat (2), the adjusting seat (2) being movably mounted on the inner upper end of the pressure reducing valve body (1), a first screw rod (3) being movably mounted on the middle part of the top end of the pressure reducing valve body (1), an output shaft of the first screw rod (3) being threadedly connected to the middle part of the adjusting seat (2), and a first adjusting disk (12) being arranged on the top end of the first screw rod (3).

2. A pressure reducing valve according to claim 1, characterized in that: The pressure regulating mechanism further comprises a diaphragm (4), the diaphragm (4) being arranged below the pressure reducing valve body (1) near the adjusting seat (2), a pressure plate (5) being movably mounted on the upper end of the diaphragm (4), the pressure plate (5) being movably mounted on the adjusting seat (2) via a second spring (6), and a through groove (7) being penetrated through the upper right end of the pressure reducing valve body (1).

3. A pressure reducing valve according to claim 1, characterized in that: The opening and closing mechanism comprises a valve flap (8), the valve flap (8) being movably mounted on the middle part of the inner side of the pressure reducing valve body (1), and the bottom end of the valve flap (8) being movably connected to the inner lower part of the pressure reducing valve body (1) via a first spring (9).

4. A pressure reducing valve according to claim 3, characterized in that: The opening and closing mechanism further comprises a second screw rod (10), the second screw rod (10) being movably mounted at the middle of the bottom end of the pressure reducing valve body (1), and a second adjusting disk (11) being fixedly mounted at the bottom end of the second screw rod (10).

5. A pressure reducing valve according to claim 4, characterized in that: The anti-backflow mechanism comprises a fixing ring (13), the fixing ring (13) being arranged on the right side inside the pressure reducing valve body (1), a sealing ring (14) being arranged on the side of the fixing ring (13) close to the valve disc (8), a blocking disk (15) being movably installed inside the other side of the fixing ring (13), and a third spring (16) being arranged between the blocking disk (15) and the sealing ring (14).

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