An exhaustable backflow preventer

Abstract

The utility model relates to valve technical field, and disclose a kind of backflow preventer of exhaust, including main valve body, the water release valve seat of main valve body lower side is provided, the water release valve disc is movably attached on the water release sealing ring upper side, water release valve disc and spacer sleeve between are provided with water release pressing plate, the water release sealing ring is movably attached on the water release pressing plate upper side outer surface, the diaphragm upper side of main valve body is provided with diaphragm pressing plate, long valve rod is inserted in the diaphragm inside, the third hexagon nut is provided at long valve rod top end.This backflow preventer of exhaust, by the water release sealing ring of valve cover inside being provided with trace exhaust regulation integrated valve, so that gas in the valve body can be discharged in use process, avoid internal gas to cause the problem that water release valve can not be opened, simultaneously adopt left and right two sub-valve body settings, respectively set spring, avoid long valve rod outer surface directly set spring to thereby seriously affect the sensitivity problem of water release valve opening.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a backflow preventer that can release air. Background Technology

[0002] The backflow preventer is a hydraulic control device developed to strictly limit the flow of water in the pipeline to one direction only, given the serious backflow pollution in tap water supply equipment, especially domestic drinking water pipelines, and the lack of effective backflow prevention devices. Its function is to prevent the backflow of the medium in the pipeline under any working condition, so as to avoid backflow pollution. However, the existing design cannot expel the air in the valve cover, which may cause the drain valve to fail to open during field testing. At the same time, the original design of the valve body and piston combination seriously affects the sensitivity of the drain valve opening.

[0003] To solve the above problems, we urgently need a backflow preventer that can vent air. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a backflow preventer with venting capability, thereby solving the problem mentioned in the background art that the air inside the valve cover of the existing design cannot be discharged, which may cause the drain valve to fail to open during field testing. At the same time, the original design of the valve body and piston combination seriously affects the sensitivity of the drain valve opening.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a backflow preventer capable of venting air, comprising a main valve body, a drain valve seat disposed on the lower side of the main valve body, a guide vane nut disposed inside the drain valve seat, a spacer disposed on the upper side of the guide vane nut, an external hexagonal nut disposed on the lower side of the guide vane nut, a drain connector threadedly connected to the lower side of the external hexagonal nut, a drain valve disc movably fitted to the upper side of the drain sealing ring, a drain pressure plate disposed between the drain valve disc and the spacer, a drain sealing ring movably fitted to the upper outer surface of the drain pressure plate, a diaphragm pressure plate disposed on the upper side of the main valve body, a diaphragm disposed inside the diaphragm pressure plate, a long valve stem inserted inside the diaphragm, a third hexagonal nut disposed at the top of the long valve stem, a valve cover movably fitted to the upper outer surface of the main valve body, a micro-venting regulating integrated valve disposed inside the valve cover, an exhaust port opened on the right side of the micro-venting regulating integrated valve, and the valve cover connected to the main valve body by fixing screws.

[0006] Preferably, a main valve seat is provided on the right side inside the main valve body, a main spring seat is provided on the right side inside the main valve body away from the main valve seat, a main valve stem is inserted inside the main spring seat, a first hexagonal nut is provided on the right side of the main valve stem, a main spring is sleeved on the outer surface of the main valve stem, and a valve disc is provided on the right side of the main valve stem.

[0007] Preferably, a secondary valve body is provided on the left side inside the main valve body, a secondary valve seat is provided inside the secondary valve body, a secondary spring seat is provided on the right side inside the secondary valve body, a secondary valve stem is inserted inside the secondary spring seat, a secondary spring is provided on the outer surface of the secondary valve stem, and a secondary valve disc is provided on the outer surface of the secondary valve stem.

[0008] Preferably, a first O-ring is provided between the main valve seat and the main valve body, and a second O-ring is provided between the valve disc and the main valve seat.

[0009] Preferably, a third O-ring is provided between the secondary valve disc and the secondary valve seat, a fourth O-ring is provided between the secondary valve body and the main valve body, the secondary valve body and the main valve body are connected by a double-ended bolt, a gasket is provided between the double-ended bolt and the secondary valve body, and a second hexagonal nut is threaded to the right side of the double-ended bolt.

[0010] Preferably, a fifth O-ring is provided between the micro-venting regulating integrated valve and the valve cover.

[0011] Preferably, a drain pressure sleeve is movably fitted to the lower outer surface of the drain valve seat, and the drain pressure sleeve is connected to the main valve body via a connector bolt. The upper outer surface of the drain pressure sleeve is movably fitted to the lower outer surface of the drain valve seat. Compared with the prior art, the beneficial effects of this utility model are: This ventable backflow preventer features a micro-venting regulating valve inside the valve cover, allowing gas inside the valve body to escape during use. This prevents the drain valve from being unable to open due to internal gas. Additionally, it uses two separate valve bodies, each with its own spring, avoiding the problem of directly mounting a spring on the outer surface of a long valve stem, which would severely affect the sensitivity of the drain valve opening. Attached Figure Description

[0012] Figure 1 This is a frontal sectional view of the present invention. Figure 2 This is an enlarged structural diagram of point A in this utility model.

[0013] In the diagram: 1. Drain connector; 2. External hexagonal nut; 3. Drain valve seat; 4. Guide vane nut; 5. Spacer; 6. Drain sealing ring; 7. Drain valve disc; 8. Main valve body; 9. First O-ring seal; 10. Main valve seat; 11. Second O-ring seal; 12. Valve disc; 13. First hexagonal nut; 14. Main spring; 15. Main spring seat; 16. Long valve stem; 17. Secondary valve stem; 18. Secondary spring; 19. Third O-ring seal; 20. Secondary valve body; 21. Fourth O-ring seal; 22. Double-ended bolt; 23. Gasket; 24. Second hexagonal nut; 25. Diaphragm pressure plate; 26. Diaphragm; 27. Third hexagonal nut; 28. Micro-venting regulating integrated valve; 29. ​​Fifth O-ring seal; 30. Valve cover; 31. Fixing screw; 32. Drain pressure plate; 33. Secondary valve seat; 34. Main valve stem; 35. Drain pressure sleeve; 36. Connecting bolt; 37. Vent; 38. Secondary spring seat; 39. Secondary valve disc. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Referring to Figures 1-2, in order to address the problem that air cannot be expelled from the valve cover 30 in the existing design, which may cause the drain valve to fail to open during field testing, and that the original design of the valve body and piston combination seriously affects the sensitivity of the drain valve opening, a drain valve seat 3 is provided on the lower side of the main valve body 8. A guide vane nut 4 is provided inside the drain valve seat 3. A spacer 5 is provided on the upper side of the guide vane nut 4. An external hexagonal nut 2 is provided on the lower side of the guide vane nut 4. A drain connector 1 is threadedly connected to the lower side of the external hexagonal nut 2. The drain valve is movably fitted on the upper side of the drain sealing ring 6. A drain valve disc 7 and a spacer 5 are provided with a drain pressure plate 32. A drain sealing ring 6 is movably fitted to the upper outer surface of the drain pressure plate 32. A diaphragm pressure plate 25 is provided on the upper side of the main valve body 8. A diaphragm 26 is provided inside the diaphragm pressure plate 25. A long valve stem 16 is inserted inside the diaphragm 26. A third hexagonal nut 27 is provided at the top of the long valve stem 16. A valve cover 30 is movably fitted to the upper outer surface of the main valve body 8. A micro-venting regulating integrated valve 28 is provided inside the valve cover 30. A vent 37 is opened on the right side of the micro-venting regulating integrated valve 28. The valve cover 30 and the main valve body 8 are connected by fixing screws 31.

[0016] Working principle: When using this ventable backflow preventer, a micro-venting regulating integrated valve 28 is installed inside the valve cover 30, and an exhaust port 37 is provided on the right side of the micro-venting regulating integrated valve 28, so that the gas inside the valve body can be discharged during use. At the same time, two separate valve bodies are set on the left and right, each with a spring, which avoids the problem of directly wrapping the spring on the outer surface of the long valve stem 16, which would seriously affect the sensitivity of the drain valve opening.

[0017] Compared with related technologies, the backflow preventer with exhaust capability provided by this utility model has the following beneficial effects: it can exhaust the gas inside the valve body during use, while avoiding the problem of directly sleeved springs on the outer surface of the long valve stem, which would seriously affect the opening sensitivity of the drain valve.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backflow preventer capable of venting air, comprising a main valve body (8), characterized in that: A drain valve seat (3) is provided on the lower side of the main valve body (8). A guide vane nut (4) is provided inside the drain valve seat (3). A spacer (5) is provided on the upper side of the guide vane nut (4). An external hexagonal nut (2) is provided on the lower side of the guide vane nut (4). A drain connector (1) is threadedly connected to the lower side of the external hexagonal nut (2). A drain pressure plate (32) is provided between the spacer (5) and the drain valve disc (7). A drain sealing ring (6) is movably fitted on the upper outer surface of the drain pressure plate (32). A membrane is provided on the upper side of the main valve body (8). A diaphragm pressure plate (25) is provided with a diaphragm (26) on its inner side. A long valve stem (16) is inserted inside the diaphragm (26). A third hexagonal nut (27) is provided at the top of the long valve stem (16). A valve cover (30) is movably attached to the outer surface of the upper side of the main valve body (8). A micro-venting regulating integrated valve (28) is provided inside the valve cover (30). A vent (37) is opened on the right side of the micro-venting regulating integrated valve (28). The valve cover (30) is connected to the main valve body (8) by a fixing screw (31).

2. The ventable backflow preventer according to claim 1, characterized in that: The main valve body (8) has a main valve seat (10) on the right side inside. The main valve body (8) has a main spring seat (15) on the right side away from the main valve seat (10). The main spring seat (15) has a main valve stem (34) inserted inside. The main valve stem (34) has a first hexagonal nut (13) on the right side. The main valve stem (34) has a main spring (14) sleeved on the outer surface. The main valve stem (34) has a valve disc (12) on the right side.

3. The ventable backflow preventer according to claim 1, characterized in that: The main valve body (8) has a secondary valve body (20) on the left side inside. The secondary valve body (20) has a secondary valve seat (33) inside. The secondary valve body (20) has a secondary spring seat (38) on the right side inside. The secondary spring seat (38) has a secondary valve stem (17) inserted inside. The secondary valve stem (17) has a secondary spring (18) on its outer surface. The secondary valve stem (17) has a secondary valve disc (39) on its outer surface.

4. The ventable backflow preventer according to claim 2, characterized in that: A first O-ring (9) is provided between the main valve seat (10) and the main valve body (8), and a second O-ring (11) is provided between the valve disc (12) and the main valve seat (10).

5. A backflow preventer capable of venting air according to claim 3, characterized in that: A third O-ring (19) is provided between the secondary valve disc (39) and the secondary valve seat (33), and a fourth O-ring (21) is provided between the secondary valve body (20) and the main valve body (8). The secondary valve body (20) and the main valve body (8) are connected by a double-ended bolt (22). A gasket (23) is provided between the double-ended bolt (22) and the secondary valve body (20). A second hexagonal nut (24) is threaded on the right side of the double-ended bolt (22).

6. The ventable backflow preventer according to claim 1, characterized in that: A fifth O-ring (29) is provided between the micro-venting regulating integrated valve (28) and the valve cover (30).

7. The ventable backflow preventer according to claim 1, characterized in that: The drain valve seat (3) has a drain pressure sleeve (35) that is movably fitted to the lower outer surface. The drain pressure sleeve (35) is connected to the main valve body (8) by a connector bolt (36). The upper outer surface of the drain pressure sleeve (35) is movably fitted to the lower outer surface of the drain valve seat (3).

Images