Drip-proof check valve

Abstract

The utility model discloses a drip-proof check valve which comprises a valve body, a valve cover and a bolt, the top of the valve body is connected with the valve cover through the bolt, a sealing gasket is arranged at the bottom of the valve cover, a spring is connected to the center of the interior of the valve cover, one side of the spring is connected with a guide rod, the center of the guide rod is connected with a spherical valve clack, and the spherical valve clack is connected with the valve cover. A guide sleeve is connected to the side, away from the spring, of the guide rod, a valve seat is arranged in the center of the interior of the valve body, a first filter screen and a second filter screen are arranged on the two sides of the valve body, a lifting type check valve is adopted for the anti-leakage check valve, the valve body and the valve seat form a sealing face through the spherical valve clack, and therefore water flow impact is reduced, and the anti-leakage check valve is convenient to use. The sealing performance is improved, vibration and noise generated during opening and closing can be reduced, the two layers of filter screens are arranged at the positions of the pipelines on the two sides of the valve body, filter screen holes of the filter screens are different, water impurities can be effectively filtered, parts in the valve body are prevented from being damaged by the impurities, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a drip-proof check valve. Background Art

[0002] A check valve is an automatic valve used to prevent fluid from flowing backwards in a pipe. It opens and closes automatically according to the flow of the fluid, usually allowing only one-way flow. Check valves play a key role in a variety of industrial applications, including water supply systems, oil and gas transportation, chemical processes, etc. Its design must ensure low resistance opening under positive pressure and tight closing under reverse pressure.

[0003] According to patent number CN213176920U, a drip-proof check valve includes: a valve body, a valve cavity is opened inside the valve body, an upper flow cavity is opened above the valve body, a lower flow cavity is opened below the valve body, and the valve cavity, the upper flow cavity and the lower flow cavity are connected from top to bottom; upper support blocks are fixed on the left and right sides of the inner wall of the upper flow cavity, and a slot is opened on the upper surface of the upper support block, and a pull rope is fixed at the middle position of the bottom of the inner surface of the slot; a piston block is movably embedded in the upper flow cavity, and an insert block is vertically fixed on the left and right sides of the lower surface of the piston block, and a spring rod is fixed at the center of the lower surface of the piston block; symmetrically arranged triangular support blocks are welded on the left and right sides of the inner wall of the valve cavity, and a middle support block is fixed on the adjacent ends of the triangular support blocks; the patent can enhance the sealing performance of the check valve, and effectively avoid leakage and dripping, and improve its use effect, but it is easy to cause the problem of impurities in the water damaging the internal parts during use, and frequent switching of the valve will cause vibration and noise problems, affecting the use of the valve.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and an anti-drip check valve is proposed to achieve a more practical purpose. Utility Model Content

[0005] The purpose of the utility model is to provide a drip-proof check valve to solve the problem proposed in the above-mentioned background technology that water impurities in the above-mentioned check valve may damage the valve body parts during use, and vibration and noise may be generated when the valve is frequently opened and closed, resulting in a reduction in the life of the valve and affecting the use of the valve.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a drip-proof check valve, comprising a valve body, a valve cover and bolts, characterized in that: the top of the valve body is connected to the valve cover by bolts, a sealing gasket is arranged at the bottom of the valve cover, a spring is connected to the inner center of the valve cover, a guide rod is connected to one side of the spring, a spherical valve disc is connected to the center of the guide rod, a guide sleeve is connected to the side of the guide rod away from the spring, a valve seat is arranged at the inner center of the valve body, a No. 1 filter screen and a No. 2 filter screen are arranged on both sides of the valve body, both sides of the valve body are connected to the pipeline side flanges by bolts, and a metal spiral wound gasket is arranged on the side of the pipeline side flange close to the valve body.

[0007] Furthermore, the spherical valve flap is a sphere, and a sealing ring is provided on the contact surface between the spherical valve flap and the valve seat.

[0008] Furthermore, fixing buckles are connected to both sides of the spherical valve disc, and the fixing buckles are connected to the guide rod.

[0009] Furthermore, the mesh diameter of the No. 1 filter is larger than that of the No. 2 filter.

[0010] Furthermore, the metal wound gasket includes an outer metal sheet, a rubber sealing ring and an inner metal sheet, the rubber sealing ring is bonded to the center of the outer metal sheet, and the inner metal sheets are arranged on both sides of the rubber sealing ring.

[0011] Furthermore, the rubber sealing ring is V-shaped, and a plurality of groups of the rubber sealing rings are arranged along the longitudinal direction of the outer metal sheet.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the anti-drip check valve adopts a lifting check valve, the valve body uses a spherical valve disc and a valve seat to form a sealing surface, thereby reducing the impact of water flow, improving the sealing performance, and reducing the vibration and noise generated during switching. Two layers of filter screens are arranged at the pipes on both sides of the valve body, and the filtering accuracy of the filter screens is different and gradually decreases, which can effectively filter water impurities, prevent the parts in the valve body from being damaged by impurities, and extend the service life. Metal spiral wound gaskets are arranged at the flange connections on both sides to strengthen the sealing of the valve body and the pipe connection to prevent leakage. The specific contents are as follows:

[0013] The top of the valve body is connected to the valve cover by bolts, and the bottom center of the valve cover is connected to a spring. One side of the spring is connected to a guide rod, and a spherical valve disc is arranged at the center of the guide rod. The spherical valve disc is fixed by a fixing buckle to prevent the spherical valve disc from being displaced on the guide rod due to the pressure of the water flow, thereby reducing the sealing effect of the spherical valve disc. The other side of the guide rod is connected to the guide sleeve. The guide sleeve can regulate the movement of the guide rod in one direction without deviation, thereby improving the sealing performance of the spherical valve disc. The spherical valve disc is a sphere, and the curved surface can better guide the water flow and reduce the water hammer effect. The impact on the valve disc, thereby improving the durability of the check valve, two layers of filter screens are arranged on both sides of the valve body, and the filtering accuracy of the two layers of filter screens is different and gradually decreases, filtering out impurities in the water, preventing the parts in the valve body from being damaged by impurities and causing damage to the sealing, reducing the maintenance frequency, and the two sides of the valve body are connected with pipeline side flanges by bolts. A metal spiral wound gasket is arranged on the side of the pipeline side flange close to the valve body. The metal spiral wound gasket is wound by the stacking of metal sheets and rubber sealing rings to provide higher compression rebound performance and good sealing performance to prevent the valve body from leaking from the pipeline connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of an anti-drip check valve of the utility model;

[0015] Figure 2 It is a partial schematic diagram of a drip-proof check valve disc of the utility model;

[0016] Figure 3 The utility model is a schematic diagram of the structure of a metal spiral wound gasket for a drip-proof check valve.

[0017] In the figure: 1. Valve body; 2. Valve cover; 3. Spherical valve disc; 4. Valve seat; 5. Guide rod; 6. Sealing gasket; 7. Bolt; 8. Guide sleeve; 9. Spring; 10. Sealing ring; 11. Fixing buckle; 12. No. 1 filter screen; 13. No. 2 filter screen; 14. Pipe side flange; 15. Metal spiral wound gasket; 16. Outer metal sheet; 17. Rubber sealing ring; 18. Inner metal sheet. 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] See also Figure 1 - Figure 3The utility model provides a technical solution: a check valve that is convenient for preventing dripping, comprising a valve body 1, a valve cover 2 and a bolt 7. The top of the valve body 1 is connected to the valve cover 2 by the bolt 7. The valve cover 2 is made of metal material and plays a role in protecting internal parts and supporting. A spring 9 is connected to the center of the bottom of the valve cover 2. A guide rod 5 is connected to one side of the spring 9. The guide rod 5 is a cylinder made of metal material. A valve disc 3 is arranged at the center of the guide rod 5. The spherical valve disc 3 is a sphere. The upper and lower sides of the spherical valve disc 3 are fixed to the guide rod 5 by fixing buckles 11. The fixing buckle 11 is made of soft material and plays a role in fixing the valve disc position. The bottom of the guide rod 5 The guide sleeve 8 is connected to the valve body 1 and is made of metal material. It plays the only role of regulating the movement direction of the guide rod 5. A valve seat 4 is arranged at the center of the valve body 1. A hole is opened at the center of the valve seat 4. The two water chambers of the valve body 1 are connected through the hole. The diameter of the spherical valve disc 3 is slightly larger than the hole opened at the center of the valve seat 4. A sealing ring 10 is arranged at the center of the outer surface of the valve disc 3. The sealing ring 10 is made of soft waterproof material. When the spherical valve disc 3 is placed in the hole of the valve seat 4, the sealing ring 10 can play a role of strengthening the seal, so that the spherical valve disc 3, the valve seat 4 and the sealing ring 10 together constitute a sealing surface to prevent leakage.

[0020] A No. 1 filter 12 and a No. 2 filter 13 are arranged on both sides of the valve body 1. The filtering accuracy of the No. 1 filter 12 is 50 microns, which can intercept larger impurities and reduce the subsequent filtering pressure. A No. 2 filter 13 is arranged on the rear side of the No. 1 filter 12. The filtering accuracy of the No. 2 filter 13 is 10 microns. The No. 2 filter 13 performs secondary filtration. The reduced filtering accuracy can maintain a longer service life and avoid premature clogging.

[0021] The two sides of the valve body 1 are connected with pipeline side flanges 14 by bolts 7. The pipeline side flanges 14 are connection structures made of metal materials, which are convenient for disassembling and installing the valve body 1 on the pipeline. A metal spiral wound gasket 15 is arranged between the pipeline side flange 14 and the valve body 1. The metal spiral wound gasket 15 includes an outer metal sheet 16, a rubber sealing ring 17 and an inner metal sheet 18. The outer metal sheet 16 and the pipeline side flange 14 can be fixed to the valve body 1 together by bolts 7. The center of the outer metal sheet 16 is bonded with a rubber sealing ring 17 by an adhesive. The adhesive is nitrile rubber, styrene butadiene rubber, polybutadiene rubber, silicone rubber, propylene One or more of acrylic rubber, natural rubber, butyl rubber, chloroprene rubber, ethylene propylene rubber, fluororubber, polyurethane rubber, acrylic adhesive and silicone adhesive plays the role of fixing the rubber sealing ring 17 on the outer metal sheet 16. The rubber sealing ring 17 is arranged in a V-shape in multiple groups longitudinally. The middle of each group of rubber sealing rings 17 is connected by an adhesive to enhance the sealing performance of the flange connection. Inner metal sheets 18 are provided on both sides of the rubber sealing ring 17. The inner metal sheet 18 is made of the same material as the outer metal sheet 16 to protect the rubber sealing ring 17 from deformation due to tightening pressure.

[0022] Working principle: When using a drip-proof check valve, the pipeline side flange 14 is first tightly connected to the pipeline, and then both sides of the check valve body 1 are connected to the pipeline side flange 14 through bolts 7. The pipeline side flange 14 is provided with a metal spiral wound gasket 15 on one side close to the valve body 1. The metal spiral wound gasket 15 is formed by a combination of an outer metal sheet 16 and a rubber sealing ring 17 to enhance the sealing performance of the flange connection, provide higher compression rebound performance and good sealing effect, and avoid the deformation of the rubber sealing ring 17 due to the tightening pressure, thereby leaking. Under the action of different water pressures on both sides, the spring 7 arranged at the bottom center of the valve cover 2 drives the valve disc 3 on the guide rod 5 to move, so that the water pipes on both sides are connected or closed, and the curved surface of the spherical valve disc 3 can be more Good water flow guidance reduces the turbulence and eddy current of water flow inside the valve, effectively reduces water flow resistance, reduces the vibration of parts and the noise caused by the flow of water, and strengthens the sealing effect of the sealing surface between the spherical valve disc 3 and the valve seat 4 through the sealing ring 10 arranged on the outer surface of the spherical valve disc 3 to prevent dripping. A No. 1 filter 12 and a No. 2 filter 13 are arranged on the water pipes on both sides. The water flow is first filtered through the 50-micron filtration accuracy of the No. 1 filter 12 to remove larger particle impurities, and then flows into the No. 2 filter 13 behind the No. 1 filter 12. The filtration accuracy of the No. 2 filter 13 is 10 microns. After the secondary filtration of smaller impurities, it enters the valve body 1. The filtered water can prevent damage to the parts in the valve body 1, extend the service life, and reduce the number of maintenance times.

Claims

1. A drip-proof check valve, comprising a valve body (1), a valve cover (2) and a bolt (7), characterized in that: The top of the valve body (1) is connected to the valve cover (2) by bolts (7), the bottom of the valve cover (2) is provided with a sealing gasket (6), the inner center of the valve cover (2) is connected to a spring (9), one side of the spring (9) is connected to a guide rod (5), the center of the guide rod (5) is connected to a spherical valve flap (3), the side of the guide rod (5) away from the spring (9) is connected to a guide sleeve (8), a valve seat (4) is provided at the inner center of the valve body (1), both sides of the valve body (1) are provided with a first filter screen (12) and a second filter screen (13), both sides of the valve body (1) are connected to a pipeline side flange (14) by bolts (7), and the side of the pipeline side flange (14) close to the valve body (1) is provided with a metal spiral wound gasket (15).

2. The anti-drip check valve according to claim 1, characterized in that: The spherical valve flap (3) is a sphere, and a sealing ring (10) is provided on the contact surface between the spherical valve flap (3) and the valve seat (4).

3. The anti-drip check valve according to claim 1, characterized in that: Both sides of the spherical valve flap (3) are connected with fixing buckles (11), and the fixing buckles (11) are connected to the guide rod (5).

4. The anti-drip check valve according to claim 1, characterized in that: The mesh diameter of the No. 1 filter screen (12) is larger than that of the No. 2 filter screen (13).

5. The anti-drip check valve according to claim 1, characterized in that: The metal spiral wound gasket (15) comprises an outer metal sheet (16), a rubber sealing ring (17) and an inner metal sheet (18); the rubber sealing ring (17) is bonded at the center of the outer metal sheet (16), and the inner metal sheets (18) are arranged on both sides of the rubber sealing ring (17).

6. The anti-drip check valve according to claim 5, characterized in that: The rubber sealing ring (17) is V-shaped, and a plurality of groups of the rubber sealing rings (17) are arranged along the longitudinal direction of the outer metal sheet (16).

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