Valve rod and valve clack assembly of stop valve

Abstract

The utility model belongs to the technical field of valves, and discloses a valve rod and valve clack assembly of a stop valve, which comprises a valve rod arranged in a valve body, the valve rod is connected with a valve clack, the bottom of the valve rod is an adjusting head structure, the bottom of the adjusting head structure is an arc-shaped surface, a blind hole is arranged on the valve clack, and the adjusting head structure is positioned in the blind hole; a circle of limiting groove is formed in the adjusting head structure, a split circular ring is installed in the limiting groove, a pressing ring is arranged on the valve clack, the valve rod is sleeved with the pressing ring, and the pressing ring is located above the split circular ring. According to the valve rod and valve clack assembly of the stop valve, the valve rod is in contact with the valve clack through an adjusting head structure, self-adjustment of a sealing face can be achieved, and the sealing performance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a valve stem and valve disc assembly of a globe valve. Background Art

[0002] The globe valve is one of the most widely used valves. During the opening and closing process of the globe valve, the friction between the sealing surfaces is small, it is relatively durable, the opening height is not large, and it is easy to manufacture. It is applicable not only to medium and low pressures but also to high pressures. The closing principle of the globe valve is that the valve stem makes the sealing surface of the valve disc and the sealing surface of the valve seat fit tightly to prevent the medium from flowing through. However, for large globe valves, there may be a situation where the sealing surface of the valve disc and the sealing surface of the valve seat cannot fit completely during closing, resulting in poor sealing performance and affecting the closing of the globe valve. Content of the Utility Model

[0003] The utility model aims to solve the above technical problems at least to a certain extent. For this purpose, the utility model aims to provide a valve stem and valve disc assembly of a globe valve.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A valve stem and valve disc assembly of a globe valve includes a valve stem disposed in the valve body. The valve stem is connected to the valve disc. The bottom of the valve stem is an adjusting head structure, and the bottom of the adjusting head structure is an arc-shaped surface. A blind hole is provided on the valve disc, and the adjusting head structure is located in the blind hole. A circumferential limiting groove is provided on the adjusting head structure, and a split ring is installed in the limiting groove. A pressure ring is provided on the valve disc, and the pressure ring is sleeved on the valve stem and is located above the split ring.

[0006] Preferably, a guide sleeve is provided in the valve body, the valve disc is slidably installed in the guide sleeve, and an O-ring is provided on the outer wall of the valve disc. A sealing ring and a gland for fixing the sealing ring on the valve disc are provided at the bottom of the valve disc.

[0007] The beneficial effects of the utility model are as follows:

[0008] For the valve stem and valve disc assembly of the globe valve provided by the utility model, the contact between the valve stem and the valve disc adopts an adjusting head structure, which can realize self-adjustment of the sealing surface and improve the sealing performance. Description of the Drawings

[0009] Figure 1 It is a schematic diagram of the valve stem and valve disc assembly of the globe valve of the utility model.

[0010] In the figure: 1-valve body; 2-valve stem; 3-valve disc; 4-adjusting head structure; 5-ring; 6-pressure ring; 7-guide sleeve; 8-O-ring; 9-sealing ring; 10-gland. Detailed Embodiment

[0011] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model. Components of the embodiments of the present utility model generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0012] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements.

[0013] The present utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0014] As Figure 1 shown, the stem-disc assembly of the globe valve in this embodiment includes a stem 2 movably disposed in a valve body 1. The lower end of the stem 2 is connected to a disc 3. The bottom of the stem 2 is an adjusting head structure 4. The bottom of the adjusting head structure 4 is an arc-shaped surface. A blind hole is provided on the disc 3, and the adjusting head structure 4 is located in the blind hole.

[0015] A circumferential limit groove is provided on the adjusting head structure 4. An open split ring 5 is installed in the limit groove. A pressure ring 6 is provided on the disc 3. The pressure ring 6 is sleeved on the stem 2. The pressure ring 6 is located above the open split ring 5. The pressure ring 6 can press the open split ring 5 to prevent the adjusting head structure 4 from disengaging from the blind hole.

[0016] A guide sleeve 7 is provided in the valve body 1. The disc 3 is slidably installed in the guide sleeve 7. An O-ring 8 is provided on the outer wall of the disc 3. The stem 2 can drive the disc 3 to move up and down in the guide sleeve 7.

[0017] A sealing ring 9 and a gland 10 for fixing the sealing ring 9 on the disc 3 are provided at the bottom of the disc 3. The sealing ring 9 forms the sealing surface of the disc 3 for contacting the seat sealing surface in the valve body 1.

[0018] When the globe valve is in use, when the valve stem 2 moves upward, the split ring 5 abuts against the split ring 5, so that the valve flap 3 can move upward together with the valve stem 2; when the valve stem 2 moves downward, the adjusting head structure 4 abuts against the bottom of the blind hole and pushes the valve flap 3 to move downward synchronously until the sealing ring 9 contacts the valve seat sealing surface. The arc-shaped surface at the bottom of the adjusting head structure 4 enables the valve flap 3 to have a certain swing amplitude in the horizontal plane. The pressure of the valve stem 2 can be transmitted to the sealing ring through the contact between the arc-shaped surface and the bottom of the blind hole, and the self-adjustment of the sealing surface where the sealing ring is located is realized during this process, so that the sealing ring is in good contact with the valve seat sealing surface.

[0019] The present utility model is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they all fall within the protection scope of the present utility model.

Claims

1. A valve stem and valve disc assembly of a stop valve, characterized in that: The valve body (1) comprises a valve stem (2) which is arranged in the valve body (1), the valve stem (2) is connected to the valve disc (3), the bottom of the valve stem (2) is an adjusting head structure (4), the bottom of the adjusting head structure (4) is an arc-shaped surface, the valve disc (3) is provided with a blind hole, and the adjusting head structure (4) is located in the blind hole; the adjusting head structure (4) is provided with a circle of limiting grooves, and a split circular ring (5) is installed in the limiting groove; the valve disc (3) is provided with a pressure ring (6), the pressure ring (6) is sleeved on the valve stem (2), and the pressure ring (6) is located above the split circular ring (5).

2. The valve stem and valve disc assembly according to claim 1, characterized in that: A guide sleeve (7) is arranged in the valve body (1), the valve flap (3) is slidably mounted in the guide sleeve (7), and an O-ring (8) is arranged on the outer wall of the valve flap (3).

3. The valve stem and valve disc assembly according to claim 1, characterized in that: A sealing ring (9) and a pressure cover (10) for fixing the sealing ring (9) on the valve disc (3) are provided at the bottom of the valve disc (3).

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