Swing check valve

Abstract

The utility model relates to a swing check valve which comprises a valve body, a valve seat, a valve clack, a spring, a spring plug, a spring plug gland, a valve clack nut, a rocker arm, a main shaft and a valve cover. A spring, a spring plug and a spring plug gland are arranged on the valve clack; the valve clack is fixed to the rocker arm through the valve clack nut, a blind hole is formed in the valve clack and used for installing the spring, and the spring plug is installed on the spring. The spring plug gland is connected with the valve clack through threads; the spring plug is limited through a spring plug gland, and a through hole is formed in the spring plug gland. According to the swing check valve, the spring is additionally arranged on the valve clack of a traditional swing check valve, the spring is compressed through steam-water pressure generated when a generator set works normally, the impact effect of the valve clack on the valve body and the main shaft is reduced, and the closing time of the valve is shortened.

Description

Technical Field

[0001] The utility model relates to a swing check valve and belongs to the field of thermal power station equipment. Background Art

[0002] The swing check valve is an important device to ensure the safe operation of thermal power generating units. Its main function is to prevent other power generation equipment from being damaged due to the reverse flow of high-pressure steam and water. When the thermal power generating unit is working normally, the valve disc of the swing check valve is in the open position due to the inflow of steam and water. When the thermal power generating unit equipment fails and causes the reverse flow of high-pressure steam and water, the valve disc of the swing check valve quickly rotates to the closed position under the action of the reverse flow of steam and water.

[0003] Normally, when a swing check valve is opened, there is a rigid impact between the valve disc and the valve body, and there is a jam between the valve disc and the main shaft. Both of these situations will accelerate the wear of valve parts and further reduce the life of the valve. In the closing process of the swing check valve, there is also a problem of long valve disc response time. Summary of the invention

[0004] In order to solve the above problems, the utility model provides a swing check valve, characterized in that: it includes a valve body, a valve seat, a valve disc, a spring, a spring plug, a spring plug gland, a valve disc nut, a rocker arm, a main shaft, and a valve cover; the valve disc is equipped with a spring, a spring plug, and a spring plug gland; the valve disc is fixed to the rocker arm through the valve disc nut, a blind hole is provided on the valve disc for installing the spring, and the spring plug is installed on the spring; the spring plug gland is connected to the valve disc through a thread; the spring plug is limited by the spring plug gland, and a through hole is provided on the spring plug gland.

[0005] Compared with the traditional swing check valve, the utility model makes full use of the mechanical characteristics of the spring to solve the problem of rigid impact between the valve disc and the valve body and the main shaft, as well as the problem of long valve disc response time. The working principle of the utility model is: first, the buffering effect of the spring is used to transform the severe rigid impact of the valve disc on the valve body and the main shaft into a smooth flexible impact, thereby reducing the impact of the valve disc on the valve body and the main shaft. Secondly, the reaction force of the spring after being compressed and restored to the free length is used. When the high-temperature soda water flows back, the spring on the valve disc is no longer affected by the pressure of the soda water and returns to the free length. The reaction force of the spring on the valve disc provides the valve disc with additional closing force, thereby achieving the beneficial effect of shortening the valve closing time. In addition, by opening a through hole on the spring plug gland, the pressure in the narrow space formed by the spring plug gland and the valve disc blind hole is released, thereby preventing the occurrence of the phenomenon that the spring cannot be compressed by the spring plug due to the pressure holding phenomenon.

[0006] It comprises a valve body (1), a valve seat (2), a valve disc (3), a spring (4), a spring plug (5), a spring plug gland (6), a valve disc nut (7), a rocker arm (8), a main shaft (9), a valve cover (10), etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural diagram of the swing check valve when it is closed.

[0008] Figure 2 It is a structural diagram of the swing check valve when it is open.

[0009] Figure 3 It is a schematic diagram of the valve disc assembly structure.

[0010] Figure 1 Among them, 1. valve body, 2. valve seat, 3. valve disc, 4. spring, 5. spring plug, 6. spring plug gland, 7. valve disc nut, 8. rocker arm, 9. main shaft, 10. valve cover.

[0011] Figure 3 In the figure, 3. valve disc, 4. spring, 5. spring plug, 6. spring plug gland. DETAILED DESCRIPTION

[0012] The swing check valve is in a normal working state, that is, the flat side of the valve disc contacts the positive flow of steam and water. The valve disc rotates around the main shaft under the action of the positive flow of steam and water to open, so that the spring plug contacts the inside of the valve body and compresses the spring in the blind hole of the valve disc. Under the elastic damping action of the spring, the impact between the valve disc and the valve body and the main shaft is reduced.

[0013] When the soda flows back, the flat side of the valve disc is no longer subject to the force generated by the soda, and the spring will return to a free state from a compressed state. At this time, the spring provides the valve disc with additional valve closing force, achieving the effect of shortening the valve closing time.

[0014] The beneficial effect of the utility model is that the service life of the valve is prolonged and the closing time of the valve is shortened by adding a spring to the valve flap.

[0015] exist Figure 3 In the embodiment shown, a blind hole is provided on the valve disc (3) for installing a spring (4), and a spring plug (5) is installed on the spring (4); the spring plug (5) is limited by a spring plug gland (6) to prevent the spring plug from being ejected by the spring; the spring plug gland (6) is connected to the valve disc (3) by threads. A through hole is provided on the spring plug gland (6) to release the pressure in the narrow space formed by the spring plug gland (6) and the blind hole of the valve disc, so as to further prevent the spring from being unable to be compressed by the spring plug due to the occurrence of pressure build-up.

Claims

1. A swing check valve, characterized in that: It includes a valve body, a valve seat, a valve disc, a spring, a spring plug, a spring plug gland, a valve disc nut, a rocker arm, a main shaft and a valve cover; the valve disc is equipped with a spring, a spring plug and a spring plug gland; the valve disc is fixed to the rocker arm through the valve disc nut, a blind hole is provided on the valve disc for installing the spring, and the spring plug is installed on the spring; the spring plug gland is connected to the valve disc through a thread; the spring plug is limited by the spring plug gland, and a through hole is provided on the spring plug gland.

Images