Y-shaped butt welding check valve

Abstract

The utility model relates to a check valve, in particular to a Y-shaped butt welding check valve, which solves the connection problem of the check valve. Comprising a valve body, the valve body is provided with an inlet end, a connecting end and an outlet end which are sequentially arranged and provided with an opening, the inlet end and the outlet end are arranged along the same axis, the axis of the connecting end and the axis of the outlet end form an included angle smaller than 90 degrees, and Y-shaped cavities are formed in the inlet end, the connecting end and the outlet end. A pressure pad, a valve seat, a screw, a valve clack and a spring are arranged in a connecting end of the cavity channel, a valve cover is arranged at an opening of the connecting end, the valve clack is provided with a movable end and a blocking end, a movable groove allowing the movable end to axially reciprocate is formed in the valve cover, a butt welding connecting mode is adopted, the connecting tightness and sealing performance are enhanced, meanwhile, an internal structure is designed in a matched mode, and the sealing performance is improved. And the service life of the product is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a check valve, especially a Y-shaped butt-welded check valve. BACKGROUND

[0002] Check valve is a kind of valve, and the closing member is circular valve clack, and it is driven by its own weight and medium pressure to block the backflow of medium. It belongs to automatic valve, also called non-return valve, one-way valve, backflow valve or isolation valve. The valve clack movement mode is divided into lifting type and swing type. The lifting type check valve is similar to the structure of stop valve, only lacks the valve stem for driving the valve clack. Medium flows from the inlet end (the swing type check valve has a valve clack which is obliquely arranged and can rotate around the shaft, and its working principle is similar to the lifting type check valve. The check valve is often used as the bottom valve of water pumping device to prevent the backflow of water. The check valve is combined with the stop valve to play the role of safety isolation. The disadvantage is that the resistance is large, and the sealing performance is poor when closed. The conventional product adopts thread connection at the valve cover connection position, which can affect the service life after long-term use, and has phenomena such as rust and blockage, and it is not easy to open and close. SUMMARY

[0003] In view of the existing technical deficiencies, the utility model provides a Y-shaped butt-welded check valve.

[0004] In order to achieve the above purpose, the utility model adopts the technical scheme: a Y-shaped butt-welded check valve, comprising a valve body, the valve body has an inlet end, a connecting end and an outlet end which are arranged in sequence and have openings, the inlet end and the outlet end are arranged along the same axis, the connecting end and the outlet end axis form an angle less than 90 degrees, the inlet end, the connecting end and the outlet end are provided with a Y-shaped cavity, the cavity is provided with a pressure pad, a valve seat, a screw, a valve clack and a spring in the connecting end, the opening of the connecting end is provided with a valve cover, the valve clack has a movable end and a blocking end, the valve cover is provided with a movable groove for the axial reciprocating movement of the movable end, the pressure pad, the valve seat and the valve clack are fixedly connected through the screw, the spring is sleeved on the movable end, the cavity has an abutting portion between the inlet end and the connecting end, the valve seat and the abutting portion are closed through elastic contact, the valve cover and the connecting end are butt-welded and fixed, and the valve cover and the connecting end are also provided with a labyrinth seal and a rubber seal.

[0005] The inlet end and the connecting end have a narrow opening, the narrow opening is notched on the side close to the connecting end, and the valve seat and the notch wall abut and seal.

[0006] The valve seat is provided with a mounting groove, and the pressure pad is arranged in the mounting groove.

[0007] The diameter of the movable end is smaller than the diameter of the blocking end.

[0008] The valve cover is also provided with a positioning groove for mounting the spring.

[0009] The connecting end is also provided with an axially blocking limiting frame, and the valve cover and the limiting frame abut against each other for limiting.

[0010] The connecting end has a groove at the opening, and a sealing ring is provided in the groove.

[0011] The connecting end has a slot on its inner wall, and the valve cover has a locking block that cooperates with the slot.

[0012] The valve disc has a pressure relief groove at the connection point.

[0013] The beneficial effects of this utility model are as follows: The Y-type butt-welded check valve provided by this utility model adopts a butt-welding connection method, which strengthens the connection tightness and sealing performance. At the same time, the internal structure is designed to improve the service life of the product, which has practical and economic benefits. Attached Figure Description

[0014] Fig. 1 This is a schematic diagram of the structure of this utility model;

[0015] Fig. 2 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0016] like Figs. 1-2 As shown, a Y-type butt-welded check valve includes a valve body 1. The valve body 1 has an inlet end 2, a connecting end 3, and an outlet end 4 arranged sequentially with openings. The inlet end 2 and the outlet end 4 are arranged along the same axis, and the axes of the connecting end 3 and the outlet end 4 form an angle of less than 90 degrees. A Y-shaped cavity 5 is provided within the inlet end 2, the connecting end 3, and the outlet end 4. This layout facilitates forward flow while providing a reverse locking effect. It is also a basic structural form for many products, and will not be elaborated or limited further here. Butt welding refers to the method of placing the workpieces between two clamping devices, aligning their end faces, and heating them at the contact point. Butt welding requires that the cross-sectional dimensions and shapes of the workpieces at the contact point be the same or similar to ensure uniform heating of the contact surface. Butt welding is mainly used for manufacturing enclosed parts (such as bicycle rims, steel windows, etc.); extending rolled materials (such as steel weights, steel pipes, reinforcing bars, etc.); and welding dissimilar materials (such as butt welding of dissimilar materials to save valuable materials and improve the life of the working parts of the cutting tools). Butt welding is widely used because it has high productivity and is easy to automate.

[0017] The cavity 5 is provided with a pressure pad 6, a valve seat 7, a screw 8, a valve flap 9 and a spring 10 in the connecting end 3, the connecting end 3 is provided with a valve cover 11 at the opening, the valve flap 9 has a movable end 12 and a blocking end 13, the valve cover 11 is provided with a movable groove 14 for the axial reciprocating movement of the movable end 12, the pressure pad 6, the valve seat 7 and the valve flap 9 are fixedly connected through the screw 8, and the spring 10 is sleeved on the movable end 12. The valve flap 9 is a core component, the linear reciprocating movement of the valve flap 9 affects the on-off of the cavity 5, and the valve seat 7 plays a role in fixing and positioning the valve flap 9. On this basis, the mounting screw 8 strengthens the connection between the valve seat 7 and the valve flap 9, and the pressure pad 6 is provided for local protection. The movable end 12 is limited to move, and the blocking end 13 is directly contacted to realize the on-off of the cavity 5.

[0018] The cavity 5 has an abutting portion 15 between the inlet end 2 and the connecting end 3, the valve seat 7 and the abutting portion 15 are closed by elastic contact, the valve cover 11 and the connecting end 3 are fixed by butt welding connection, and the valve cover 11 and the connecting end 3 are also provided with a labyrinth seal and a rubber seal. The butt welding connection strengthens the connection, reduces the possibility of vibration loosening, and directly improves the connection sealing performance. The labyrinth seal is a continuous and tortuous passage through which the medium passes, achieving a throttling sealing effect. The rubber seal directly uses a sealing ring 22 to achieve sealing and damping auxiliary effects.

[0019] The inlet end 2 and the connecting end 3 have a narrow opening 16, the narrow opening 16 is provided with a slot 17 near the connecting end 3, and the valve seat 7 and the slot wall of the slot 17 are in abutting sealing. The design of the narrow opening 16 and the slot 17 is beneficial to the fixation of the valve seat 7. In this embodiment, the slot 17 is a bevel slot to facilitate the valve seat 7 to enter the predetermined position, and the accuracy is relatively high. The valve seat 7 is provided with a mounting groove 18, and the pressure pad 6 is arranged in the mounting groove 18. The mounting groove 18 and the accessories do not affect the sealing performance, and are convenient for assembly and use. The diameter of the movable end 12 is smaller than the diameter of the blocking end 13. The movable end 12 can be directly sleeved with the spring 10, which is convenient for processing and production, and realizes the movable limiting. The valve cover 11 is further provided with a positioning groove 20 for mounting the spring 10, which is essentially an annular structure, and the machining of the positioning groove 20 directly forms the connected part. The connecting end 3 is further provided with a limiting frame 21 for axial blocking, and the valve cover 11 and the limiting frame 21 are in abutting limiting. The design of the limiting frame 21 plays a role in protection and support, and strengthens the local structural strength, and the specific size is determined according to the actual use needs.

[0020] The connecting end 3 is provided with a cutting groove 17 at the opening, and a sealing ring 22 is arranged in the cutting groove 17, which plays an auxiliary sealing role through rubber sealing. The connecting end 3 is provided with a clamping groove 23 on the inner side wall, and the valve cover 11 is further provided with a clamping block 24 matched with the clamping groove 23. The design of the clamping block 24 and the clamping groove 23 strengthens the installation of the valve cover 11 and improves the connection tightness. The valve clack 9 is provided with a pressure relief groove at the connecting position. The pressure relief groove of the check valve is a key structure for balancing the internal pressure of the valve body and preventing equipment damage caused by medium backflow or pressure mutation. The core function and design points are as follows: the pressure relief groove is opened through a specific structure (such as a pressure relief hole, a spring 10 assembly) when the valve core is abnormally pressed, and the excess pressure is released to the outside of the valve body, so as to avoid the rupture of the valve body or pipeline due to overpressure. When the medium backflow or water hammer effect (such as sudden pump stop leading to pressure surge) occurs, the pressure relief groove can quickly respond, reduce the impact force, and prolong the service life of the check valve and pipeline.

[0021] In the description of the utility model, it is necessary to explain that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the utility model, at the same time, the basic principle, main features and advantages of the utility model are shown and described above, and those skilled in the art should understand.

Claims

1. A Y-type butt welded check valve comprising a valve body, characterized in that, The valve body has an inlet end, a connecting end and an outlet end which are arranged in sequence and have openings, the inlet end and the outlet end are arranged along the same axis, the connecting end and the outlet end have an angle less than 90 degrees, the inlet end, the connecting end and the outlet end are provided with a Y-shaped cavity, the cavity is provided with a pressing pad, a valve seat, a screw, a valve flap and a spring in the connecting end, the connecting end is provided with a valve cover at the opening, the valve flap has a movable end and a blocking end, the valve cover is provided with a movable groove for the axial reciprocating movement of the movable end, the pressing pad, the valve seat and the valve flap are fixedly connected through the screw, the spring is sleeved on the movable end, the cavity has an abutting portion between the inlet end and the connecting end, the valve seat and the abutting portion are closed through elastic contact, the valve cover and the connecting end are fixedly connected through butt welding, the valve cover and the connecting end are also provided with a labyrinth seal and a rubber seal.

2. A Y-type butt welded check valve as defined in claim 1, characterized in that The inlet end and the connecting end have a narrow opening, the narrow opening is cut on the side close to the connecting end, and the valve seat and the slot wall are abutted and sealed.

3. A Y-type butt welded check valve as defined in claim 2, wherein, The valve seat is provided with a mounting groove, and the pressing pad is arranged in the mounting groove.

4. A Y-type butt welded check valve according to claim 2 or 3, c h a r a c t e r i s e d in that The diameter of the movable end is smaller than the diameter of the blocking end.

5. A Y-type butt welded check valve as defined in claim 4, wherein, The valve cover is further provided with a positioning groove for mounting the spring.

6. A Y-type butt welded check valve as defined in claim 1, wherein, The connecting end is further provided with a limiting frame for axial blocking, and the valve cover and the limiting frame are abutted and limited.

7. A Y-type butt welded check valve as defined in claim 6, wherein The connecting end is provided with a cut groove at the opening, and the cut groove is provided with a sealing ring.

8. A Y-type butt welded check valve as defined in claim 6 wherein, The connecting end is provided with a clamping groove on the inner side wall, and the valve cover is further provided with a clamping block matched with the clamping groove.

9. A Y-type butt welded check valve as defined in claim 1 wherein, The valve flap is provided with a pressure relief groove at the connecting portion.

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