High-pressure stop valve convenient to maintain

Abstract

A high-pressure stop valve convenient to maintain comprises a valve body, a valve clack, a valve deck and a valve rod, the valve deck is fixedly connected to the top of the valve body, the valve rod is installed in the center of the valve deck in a penetrating mode, the lower end of the valve rod extends into an inner cavity of the valve body, and the valve clack is fixedly connected to the lower end of the valve rod. A valve seat matched with the valve clack is arranged in the valve body, an annular circular bead is arranged at the upper end of an inner hole of the valve seat, a detachable valve seat ring is installed on the annular circular bead in a pressing mode, and sealing is achieved through the fact that the sealing face of the valve clack is tightly attached to the valve seat ring. By improving the structure of the valve body and installing the replaceable valve seat ring, when the contact face of the valve seat ring and the valve clack is damaged, the valve seat ring can be replaced in time, rapid maintenance of the stop valve is achieved, and the maintenance cost is low.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure shut-off valve technology, and in particular to a high-pressure shut-off valve that is easy to maintain. Background Technology

[0002] A gate valve is a type of valve that controls the flow of fluid and regulates its flow rate by moving a valve disc up and down. When the valve disc moves downward, the gap between the valve disc and the valve seat gradually decreases until they are tightly fitted, thus preventing the fluid from passing through. When the valve disc moves upward, the gap gradually increases, allowing the fluid to pass through. High-pressure gate valves contain high-speed, high-temperature, and high-pressure fluid. When the valve disc moves downward to seal with the valve seat, as the gap between the valve disc and the valve seat gradually decreases, the scouring pressure exerted by the fluid on the valve seat and valve disc increases rapidly and geometrically. This damages the contact surface between the valve seat and valve disc, resulting in poor sealing and internal leakage.

[0003] Most existing high-temperature and high-pressure steam traps use the aforementioned gate valve structure. If a leak occurs, leading to internal leakage, it prevents the isolation and repair of operating equipment, threatening the safety of maintenance personnel. Since the valve seat and body are integrated, the solutions are either to replace the valve body or to repair the valve seat. Replacing the valve body is time-consuming and expensive, while repairing the valve seat is both difficult and time-consuming. Utility Model Content

[0004] In order to solve the above-mentioned problems in the prior art, this utility model provides a high-pressure shut-off valve that is easy to maintain.

[0005] This utility model is achieved through the following technical solution: a high-pressure shut-off valve that is easy to maintain, comprising a valve body, a valve disc, a valve cover, and a valve stem. The valve cover is fixedly connected to the top of the valve body. The valve stem is installed through the center of the valve cover and its lower end extends into the inner cavity of the valve body. The valve disc is fixedly connected to the lower end of the valve stem. A valve seat that cooperates with the valve disc is provided in the valve body. The valve seat is characterized in that: an annular shoulder is provided at the upper end of the inner hole of the valve seat, and a removable valve seat ring is pressed on the annular shoulder. The sealing is achieved by the sealing surface of the valve disc being in close contact with the valve seat ring.

[0006] Furthermore, an annular groove is provided on the sealing surface of the valve disc, and a sealing ring is embedded in the annular groove. When sealing, the sealing ring is in close contact with the valve seat ring.

[0007] Furthermore, the sealing ring is made of Stellite alloy, and the valve seat ring is made of wear-resistant material.

[0008] Furthermore, the valve body is provided with an annular positioning groove at the top, a central gasket is provided at the bottom of the annular positioning groove, and an annular positioning boss is provided at the lower end of the valve cover to match the annular positioning groove, and the annular positioning boss is embedded in the annular positioning groove.

[0009] Furthermore, a packing pressure plate and a packing sleeve are fitted on the valve stem. The packing pressure plate is connected to the valve cover by bolts. The packing sleeve is pressed down by the packing pressure plate to compact the sealing packing between the valve stem and the valve cover.

[0010] The beneficial effects of this utility model are:

[0011] 1. This utility model improves the valve body structure and installs a replaceable valve seat ring. When the contact surface between the valve seat ring and the valve disc is damaged, the valve seat ring can be replaced in time, which can achieve rapid repair of the gate valve and reduce the repair cost.

[0012] 2. The valve seat ring of this utility model can also be made of wear-resistant material, which can further extend the service life and replacement cycle of the valve seat ring.

[0013] 3. The present invention may also provide a Stellite alloy sealing ring at the contact surface between the valve disc and the valve seat ring. Due to the high hardness and erosion resistance of Stellite alloy material, the service life and replacement cycle of the valve disc can be extended. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of a specific area;

[0016] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0017] Figure labels: Valve body 1, Annular positioning groove 1-1, Middle gasket 1-2, Valve disc 2, Annular groove 2-1, Sealing ring 2-2, Valve cover 3, Annular positioning boss 3-1, Valve stem 4, Valve seat 5, Annular shoulder 5-1, Valve seat ring 5-2, Rotary handwheel 6, Packing pressure plate 7, Bolt 8, Packing sleeve 9, Sealing packing 10. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in detail with reference to specific embodiments.

[0019] A high-pressure shut-off valve with easy maintenance includes a valve body 1, a valve disc 2, a valve cover 3, and a valve stem 4. The valve cover 3 is fixedly connected to the top of the valve body 1. The valve stem 4 is installed through the center of the valve cover 3, with its lower end extending into the inner cavity of the valve body 1, and a rotating handwheel 6 is provided at its upper end. The valve disc 2 is fixedly connected to the lower end of the valve stem 4. A valve seat 5 that mates with the valve disc 2 is provided inside the valve body 1. An annular shoulder 5-1 is provided at the upper end of the inner hole of the valve seat 5, and a removable valve seat ring 5-2 is pressed onto the annular shoulder 5-1. Sealing is achieved by the sealing surface of the valve disc 2 closely adhering to the valve seat ring 5-2. During operation, rotating the handwheel 6 moves the valve stem 4 downward, causing the sealing surface of the valve disc 2 to closely adhere to the valve seat ring 5-2, thus achieving a seal.

[0020] To extend the service life and replacement cycle of the valve disc and valve seat ring, an annular groove 2-1 is provided on the sealing surface of the valve disc 2, and a sealing ring 2-2 is embedded in the annular groove 2-1. During sealing, the sealing ring 2-2 is in close contact with the valve seat ring 5-2. The sealing ring 2-2 is made of Stellite alloy, and the valve seat ring 5-2 is made of wear-resistant material.

[0021] When installing the valve seat ring 5-2, the installation area of ​​the valve body 1 is heated by utilizing the thermal expansion characteristics of metal, so that the annular shoulder 5-1 expands appropriately. Then, the valve seat ring 5-2 is quickly pressed onto the annular shoulder 5-1. After the valve body cools and shrinks naturally, the valve body and the valve seat ring form a tight interference fit, which avoids the valve seat ring from loosening or shifting due to thermal cycling or scouring force under high pressure, and significantly improves the sealing performance and durability of the valve.

[0022] When the valve seat ring needs to be replaced, the principle is the same as during installation. First, heat the valve body 1 to make it expand appropriately, then quickly remove the damaged valve seat ring and replace it with a new valve seat ring, thus achieving rapid repair of the gate valve.

[0023] In one embodiment, the valve body 1 has an annular positioning groove 1-1 at its top, a central gasket 1-2 at the bottom of the annular positioning groove 1-1, and an annular positioning boss 3-1 at the lower end of the valve cover 3 that matches the annular positioning groove 1-1, with the annular positioning boss 3-1 embedded in the annular positioning groove 1-1. This seals the connection between the valve cover 3 and the valve body 1.

[0024] In one embodiment, a packing pressure plate 7 and a packing sleeve 9 are fitted onto the valve stem 4. The packing pressure plate 7 is connected to the valve cover 3 by bolts 8. By pressing down the packing sleeve 9 with the packing pressure plate 7, the sealing packing 10 between the valve stem 4 and the valve cover 3 is compacted, thereby achieving a rotational seal between the valve stem 4 and the valve body 1.

[0025] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A high-pressure shut-off valve that is easy to maintain, comprising a valve body (1), a valve disc (2), a valve cover (3), and a valve stem (4), wherein the valve cover (3) is fixedly connected to the top of the valve body (1), the valve stem (4) is installed through the center of the valve cover (3) and its lower end extends into the inner cavity of the valve body (1), the valve disc (2) is fixedly connected to the lower end of the valve stem (4), and a valve seat (5) that cooperates with the valve disc (2) is provided inside the valve body (1), characterized in that: The valve seat (5) has an annular shoulder (5-1) at the upper end of its inner hole, and a removable valve seat ring (5-2) is press-fitted onto the annular shoulder (5-1). The valve disc (2) is sealed by its sealing surface being in close contact with the valve seat ring (5-2).

2. The high-pressure shut-off valve with convenient maintenance according to claim 1, characterized in that: The valve disc (2) has an annular groove (2-1) on its sealing surface, and a sealing ring (2-2) is embedded in the annular groove (2-1). When sealing, the sealing ring (2-2) is in close contact with the valve seat ring (5-2).

3. The high-pressure shut-off valve with convenient maintenance according to claim 2, characterized in that: The sealing ring (2-2) is made of Stellite alloy, and the valve seat ring (5-2) is made of wear-resistant material.

4. A high-pressure shut-off valve that is easy to maintain according to claim 1, characterized in that: The valve body (1) is provided with an annular positioning groove (1-1) at the top, and a middle gasket (1-2) is provided at the bottom of the annular positioning groove (1-1). The valve cover (3) is provided with an annular positioning boss (3-1) at the lower end that is adapted to the annular positioning groove (1-1), and the annular positioning boss (3-1) is embedded in the annular positioning groove (1-1).

5. A high-pressure shut-off valve that is easy to maintain according to claim 1, characterized in that: The valve stem (4) is fitted with a packing pressure plate (7) and a packing sleeve (9). The packing pressure plate (7) is connected to the valve cover (3) by bolts (8). The packing pressure plate (7) presses down on the packing sleeve (9) to compact the sealing packing (10) between the valve stem (4) and the valve cover (3).

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