Stop valve with multiple valve cores and valve seats

Abstract

The invention discloses a stop valve with multiple valve elements and valve seats, and relates to the field of valves, the stop valve comprises a valve body, a valve cover and a valve rod, a spring and a valve element pressing sleeve are sequentially installed along the valve rod, and the spring is always kept in a compressed state; the valve element pressing sleeve is connected with a main valve element, and a main valve seat corresponding to the main valve element is arranged in the valve body. A cavity is formed in the main valve element, and a plurality of flow guide holes communicated with the cavity are formed in the main valve element; an auxiliary valve seat is arranged at the bottom of the main valve element, and one end of the valve rod is arranged in the cavity and connected with the auxiliary valve element. The other end of the valve rod is connected with a driving nut, and the driving nut rotates to drive the valve rod to move downwards, so that the main valve element makes contact with the main valve seat firstly, the auxiliary valve element makes contact with the auxiliary valve seat later, and valve inner sealing is formed. Through a multi-valve-element and valve-seat structure and in cooperation with the continuously-pressed spring, the rotating torque can be reduced, and the sealing performance of the stop valve when the stop valve is closed is improved; therefore, stability and reliability of the stop valve are improved, service life is prolonged, and manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of valves, and in particular to a stop valve with multiple valve cores and valve seats. Background Art

[0002] As a fluid control device, the stop valve is widely used in pipeline systems in the petroleum, chemical, electric power, metallurgy, pharmaceutical and other industries to cut off or connect the medium in the pipeline. For example, the stop valve is often used in high-temperature and high-pressure pipelines in thermal power plants, nuclear power plants, and petrochemical systems. However, there are some problems that need to be solved in the actual application of the current stop valve.

[0003] The globe valve is a forced sealing valve. Its working principle determines that a large pressure needs to be applied to the valve core in the closed state to achieve a good sealing effect. However, in large-diameter, high-pressure pipelines, when opening and closing the valve, a large resistance torque needs to be overcome. When using a manually operated handwheel drive, the operator usually feels very strenuous; for electrically driven globe valves, large torque means that a higher-power motor is required to provide sufficient driving torque, which not only increases the cost and size of the equipment, but also the equipment is prone to wear and tear of the deceleration mechanism in this long-term working condition, thereby reducing the service life, increasing the frequency of maintenance and replacement, and further affecting production efficiency and cost. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a stop valve with multiple valve cores and valve seats. Through the multiple valve core and valve seat structure, in conjunction with a continuously compressed spring, the rotational torque can be reduced and the sealing of the stop valve when it is closed can be improved; thereby improving the stability, reliability and service life of the stop valve and reducing production costs.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] An embodiment of the present invention provides a stop valve with multiple valve cores and valve seats, including a valve body, a valve cover, and a valve stem, wherein a spring and a valve core compression sleeve are installed in sequence along the valve stem, and the spring is always kept in a compressed state; the valve core compression sleeve is connected to the main valve core, and a main valve seat is provided in the valve body corresponding to the main valve core; the main valve core has a cavity, and the main valve core has a plurality of guide holes connected to the cavity; an auxiliary valve seat is provided at the bottom of the main valve core, and one end of the valve stem is placed in the cavity and connected to the auxiliary valve core; the other end of the valve stem is connected to a driving nut, and the rotation of the driving nut can drive the valve stem to move downward, so that the main valve core contacts the main valve seat first, and the auxiliary valve core contacts the auxiliary valve seat later, thereby forming a seal inside the valve.

[0007] As a further implementation, the valve stem is provided with a sealing seat, the sealing seat is connected to the valve cover, and the spring is arranged between the sealing seat and the valve core pressing sleeve.

[0008] As a further implementation, the valve stem has a boss, and the spring is arranged between the boss and the valve core pressing sleeve.

[0009] As a further implementation, one or more guide holes are provided on the peripheral side of the main valve core; when the valve is closed, the high-pressure medium can flow out through the auxiliary valve seat and the guide holes.

[0010] As a further implementation method, the valve core compression sleeve is installed at the connection between the auxiliary valve core and the valve stem to limit the movement of the auxiliary valve core.

[0011] As a further implementation, the mounting surfaces of the valve core pressing sleeve and the main valve core are stepped surfaces to simultaneously limit the auxiliary valve core and the spring.

[0012] As a further implementation, a sealing ring is provided between the valve cover and the valve stem to form a valve stem seal.

[0013] As a further implementation, the contact surface between the auxiliary valve core and the auxiliary valve seat is a conical surface.

[0014] As a further implementation, the auxiliary valve seat has a matching portion adapted to the auxiliary valve core head and a through-hole communicated with the matching portion, and the through-hole and the matching portion form a variable cross-section structure.

[0015] The beneficial effects of the present invention are as follows:

[0016] During the closing process of the valve of the present invention, the main valve core contacts the main valve seat first, and the auxiliary valve core contacts the auxiliary valve seat later, forming a seal inside the valve; and a valve stem seal is provided to improve the sealing of the stop valve when it is closed; the valve stem is installed with a compression spring, and the spring moves synchronously with the valve stem and is continuously compressed during the downward movement of the valve stem, which can offset the medium resistance and reduce the valve stem rotation torque. An auxiliary valve seat is provided below the main valve core, and guide holes are provided around the auxiliary valve seat. When the valve is closed, high-pressure medium can flow out through the auxiliary valve seat and the guide holes, thereby reducing the resistance of the main valve core. The valve stem only needs to overcome the resistance of the medium to the auxiliary valve seat, greatly reducing the rotation torque; thereby improving the stability, reliability and service life of the stop valve and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 1 is a schematic diagram of the stop valve structure of Example 1 of the present invention;

[0019] Figure 2 It is a schematic diagram of the stop valve structure of Example 2 of the present invention.

[0020] Among them, 1. drive nut; 2. valve cover; 3. valve stem; 4. sealing ring; 5. sealing seat; 6. spring; 7. valve core sleeve; 8. guide hole; 9. main valve core; 10. main valve seat; 11. valve body; 12. auxiliary valve core; 13. auxiliary valve seat. DETAILED DESCRIPTION

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0022] For the convenience of description, the words "upper" and "lower" appearing in the present invention only indicate that the upper and lower directions are consistent with the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] Embodiment 1:

[0024] Since the stop valve is a forced sealing valve, it is necessary to overcome the resistance of the medium and apply a large pressure to the valve core in the closed state to ensure a good sealing effect; this problem is particularly prominent in large-diameter, high-pressure pipelines due to the large pressure area and long stroke. The large diameter means that the sealing surface between the valve core and the valve seat is larger, and a higher sealing pressure is required to prevent the leakage of the medium; and the high pressure makes the medium exert a greater force on the valve core, further increasing the pressure required to close the valve. At the same time, the longer valve stroke also increases the difficulty and time of operation.

[0025] Based on this, the present embodiment provides a stop valve with multiple valve cores and valve seats, which adopts a multiple valve core and valve seat structure. An auxiliary valve seat 13 is provided under the main valve core 9, and the main valve core 9 is provided with a guide hole 8. When the valve is closed, the high-pressure medium can flow out through the auxiliary valve seat 13 and the guide hole 8, thereby reducing the resistance of the main valve core 9. The valve stem 3 only needs to overcome the resistance of the medium to the auxiliary valve seat 13, thereby greatly reducing the rotational torque.

[0026] The stop valve is described in detail below with reference to the accompanying drawings.

[0027] like Figure 1As shown, the stop valve of this embodiment includes a valve body 11, a valve cover 2, a valve stem 3, a main valve core 9, a main valve seat 10, an auxiliary valve core 12, an auxiliary valve seat 13, etc. The valve body 11 is connected to the valve cover 2 by bolts. The main valve seat 10 is arranged in the valve body 11, wherein the main part of the main valve seat 10 is a cylindrical channel, and only the contact surface with the main valve core 9 at the top is set as a conical surface. The valve stem 3, the valve cover 2, and the valve body 11 are all coaxially installed, and the driving nut 1 is installed at the top of the valve stem 3, and the up and down movement of the valve stem 3 is achieved by rotating the driving nut 1.

[0028] The bottom end of the valve stem 3 is connected to the auxiliary valve core 12, which is a cone structure. The connection between the auxiliary valve core 12 and the valve stem 3 forms a step surface, on which the valve core pressing sleeve 7 is installed; the valve core pressing sleeve 7 is connected to the main valve core 9. The outer side of the valve core pressing sleeve 7 is also a step structure, and the valve core pressing sleeve 7 plays a role in limiting the auxiliary valve core 12 through the step structure and the inner wall and top surface of the main valve core 9.

[0029] The outer side of the valve stem 3 is sleeved with a sealing seat 5, which has a protrusion facing the side of the valve cover 2, and is fixed to the bottom of the valve cover 2 by plugging or threading. The spring 6 is connected between the sealing seat 5 and the valve core pressing sleeve 7, and the valve core pressing sleeve 7 also limits the spring 6 and the auxiliary valve core 12. Whether the valve is in a closed state or an open state, the spring 6 is in a compressed state. As the valve stem 3 moves downward, the spring 6 is continuously compressed, which can offset the medium resistance and move synchronously with the valve stem 3, which can reduce the rotation torque of the valve stem 3.

[0030] like Figure 1 As shown, the main valve core 9 has a cavity inside, and the auxiliary valve core 12 is arranged in the cavity; the bottom of the main valve core 9 is provided with an auxiliary valve seat 13, which is coaxially arranged with the valve stem 3 and the auxiliary valve core 12; the main valve core 9 and the main valve seat 10, the auxiliary valve seat 13 and the auxiliary valve core 12 together constitute the valve internal sealing structure. In addition, a sealing ring 4 is installed between the valve stem 3 and the valve cover 2 to form a valve stem 3 seal; the valve stem 3 seal cooperates with the valve internal seal to improve the overall sealing of the valve.

[0031] One or more guide holes 8 are provided on the peripheral side of the main valve core 9, and the axial direction of the guide hole 8 is perpendicular to the axial direction of the valve stem 3; when the valve is closed, the high-pressure medium can flow out through the auxiliary valve seat 13 and the guide hole 8, thereby reducing the resistance of the main valve core 9, and the valve stem 3 only needs to overcome the resistance of the medium to the auxiliary valve seat 13, thereby greatly reducing the rotational torque.

[0032] The auxiliary valve core 12 is a conical structure as a whole, and the auxiliary valve seat 13 is matched with the head of the auxiliary valve core 12, that is, a conical surface structure. In order to form a good seal between the auxiliary valve core 12 and the auxiliary valve seat 13, the auxiliary valve seat 13 is composed of two parts that are interconnected, namely, a matching part that is matched with the head of the auxiliary valve core 12 and a through-hole that is connected with the matching part. The through-hole is a columnar structure, so that the auxiliary valve seat 13 structure with a variable cross-section is formed through the through-hole and the matching part, which can not only achieve a good seal when the auxiliary valve core 12 contacts the auxiliary valve seat 13, but also enable the medium to smoothly enter the main valve seat 10 from the auxiliary valve seat 13.

[0033] The working principle of this embodiment is:

[0034] The driving nut 10 rotates clockwise, driving the valve stem 3 to move downward. At this time, since the spring 6 is in a compressed state, the main valve core 9 is pushed downward by the spring 6 and moves synchronously with the valve stem 3 until the main valve core 9 contacts the main valve seat 10. At this time, the driving nut 1 continues to rotate until the auxiliary valve core 12 contacts the auxiliary valve seat 13, so that the valve is completely closed and a seal is formed.

[0035] This embodiment achieves the purpose of reducing the rotational torque through the following cooperation: first, a continuously compressed spring 6 is provided to offset the medium resistance and move synchronously with the valve stem 3; second, a multiple valve core and valve seat structure is adopted, the main valve core 9 cooperates with the main valve seat 10, and the auxiliary valve core 12 cooperates with the auxiliary valve seat 13. At the same time, the main valve core 9 is provided with one or more guide holes 8. When the valve is closed, the high-pressure medium can flow out through the auxiliary valve seat 13 and the guide hole 8, thereby reducing the resistance of the main valve core 9, and the valve stem 3 only needs to overcome the resistance of the medium to the auxiliary valve seat 13.

[0036] This embodiment fundamentally solves the problem of large closing torque of high-pressure and large-diameter stop valves, thereby improving the stability, reliability and service life of the stop valves and reducing production costs.

[0037] Embodiment 2:

[0038] This embodiment provides a stop valve with multiple valve cores and valve seats, such as Figure 2 As shown, the difference from Example 1 is that the sealing seat 5 is not provided, and a boss is provided on the valve stem 3, the boss is provided in the valve body 11 and is located below the valve cover 2, and the spring 6 is connected between the boss and the valve core pressing sleeve 7. Similarly, the spring 6 is always in a compressed state.

[0039] The working principle of this embodiment is:

[0040] The driving nut 1 rotates clockwise, driving the valve stem 3, spring 6, valve core sleeve 7 and main valve core 9 to move downward as a whole, and the valve gradually closes until the main valve core 9 contacts the main valve seat 10. At this time, the driving nut 1 continues to be rotated until the auxiliary valve core 12 contacts the auxiliary valve seat 13, so that the valve is completely closed and a seal is formed.

[0041] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stop valve with multiple valve cores and valve seats, comprising a valve body, a valve cover, and a valve stem, characterized in that: A spring and a valve core compression sleeve are installed in sequence along the valve stem, and the spring is always kept in a compressed state; the valve core compression sleeve is connected to the main valve core, and a main valve seat is provided in the valve body corresponding to the main valve core; a cavity is provided in the main valve core, and a plurality of guide holes connected to the cavity are provided in the main valve core; an auxiliary valve seat is provided at the bottom of the main valve core, and one end of the valve stem is placed in the cavity and connected to the auxiliary valve core; the other end of the valve stem is connected to a driving nut, and the rotation of the driving nut can drive the valve stem to move downward, so that the main valve core contacts the main valve seat first, and the auxiliary valve core contacts the auxiliary valve seat later, so as to form a seal inside the valve.

2. A stop valve with multiple valve cores and valve seats according to claim 1, characterized in that: The valve stem is provided with a sealing seat, the sealing seat is connected to the valve cover, and the spring is arranged between the sealing seat and the valve core pressing sleeve.

3. A stop valve with multiple valve cores and valve seats according to claim 1, characterized in that: The valve stem has a boss, and the spring is arranged between the boss and the valve core pressing sleeve.

4. A stop valve with multiple valve cores and valve seats according to any one of claims 1 to 3, characterized in that: One or more guide holes are arranged on the peripheral side of the main valve core; when the valve is closed, the high-pressure medium can flow out through the auxiliary valve seat and the guide holes.

5. A stop valve with multiple valve cores and valve seats according to any one of claims 1 to 3, characterized in that: The valve core compression sleeve is installed at the connection between the auxiliary valve core and the valve stem, and is used to limit the movement of the auxiliary valve core.

6. A stop valve with multiple valve cores and valve seats according to claim 5, characterized in that: The mounting surfaces of the valve core pressing sleeve and the main valve core are stepped surfaces so as to limit the auxiliary valve core and the spring at the same time.

7. A stop valve with multiple valve cores and valve seats according to any one of claims 1 to 3, characterized in that: A sealing ring is arranged between the valve cover and the valve stem to form a valve stem seal.

8. A stop valve with multiple valve cores and valve seats according to any one of claims 1 to 3, characterized in that: The contact surface between the auxiliary valve core and the auxiliary valve seat is a conical surface.

9. The stop valve with multiple valve cores and valve seats according to claim 8, characterized in that: The auxiliary valve seat has a matching portion matched with the auxiliary valve core head and a through-hole communicated with the matching portion.

10. A stop valve with multiple valve cores and valve seats according to claim 9, characterized in that: The through opening and the matching portion form a variable cross-section structure.

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