Stop valve with flow stabilizer

Abstract

A stop valve with a flow stabilizing device comprises a valve body (23), a valve seat (2) is arranged on a partition plate (3) of the valve body, a first valve clack (4) is arranged above the valve seat and driven by a first valve rod (5), a second valve clack (13) is arranged below the valve seat and connected with a second valve rod (17), and the second valve rod extends out of a second valve cover (16) in a sealed mode. A spring (18) is sleeved on the part of the second valve rod extending out of the second valve cover; and a nut (19) for pressing the spring is screwed at the lower end of the second valve rod. The stop valve with the flow stabilizing device has the advantages that the stop valve with the flow stabilizing device has the opening and closing function and the flow stabilizing function, the influence of water pressure fluctuation on flow can be effectively eliminated, and the flow stabilizing structure is simple and convenient to maintain.

Description

Technical Field

[0001] The utility model relates to a stop valve. Background Art

[0002] The structure of existing stop valves generally includes a valve body, a valve disc and a valve seat. When the valve disc contacts the valve seat, the valve is closed, and when the valve disc separates from the valve seat, the valve closes. The flow rate can be adjusted by adjusting the gap between the valve disc and the valve seat. However, this type of valve has no flow stabilization function. When the valve inlet pressure fluctuates, the flow rate also changes. Therefore, it is necessary to improve it. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a stop valve with a flow stabilizing device. In addition to the functions of an ordinary stop valve, the valve also has a flow stabilizing function.

[0004] The technical solution of the utility model is a stop valve with a flow stabilizing device, which includes a valve body, a water inlet pipe is provided on the left part of the valve body, a water outlet pipe is provided on the right part of the valve body, a valve seat is provided on the partition of the valve body, a first valve disc is provided above the valve seat, the first valve disc is driven by a first valve stem, the first valve stem is sealed and extended from the first valve cover, and the first valve cover is sealingly connected to the upper part of the valve body. The utility model is characterized in that a second valve disc is provided below the valve seat, the second valve disc is connected to the second valve stem, the second valve stem is sealed and extended from the second valve cover, the second valve cover is sealingly connected to the lower part of the valve body, a spring is sleeved on the extended part of the second valve stem, and a nut for pressing the spring is screwed on the lower end of the second valve stem.

[0005] Compared with the existing technology, the stop valve with a flow stabilizing device has not only the opening and closing functions but also the flow stabilizing function, which can effectively eliminate the influence of water pressure fluctuations on the flow rate. The flow stabilizing structure is simple and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural diagram of the present utility model.

[0007] The symbols in the accompanying drawings respectively represent: 1-water inlet pipe, 2-valve seat, 3-partition, 4-first valve disc, 5-first valve stem, 6-first sealing ring, 7-first flange, 8-first valve cover, 9-first sleeve, 10-thread, 11-handwheel, 12-sealing ring, 13-second valve disc, 14-second sealing ring, 15-second flange, 16-second valve cover, 17-second valve stem, 18-spring, 19-nut, 20-cap, 21-sleeve, 22-second sealing ring, 23-valve body. DETAILED DESCRIPTION

[0008] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0009] A stop valve with a flow stabilizing device includes a valve body 23, a water inlet pipe 1 is provided on the left part of the valve body, a water outlet pipe is provided on the right part of the valve body, a valve seat 2 is provided on the partition 3 of the valve body, a first valve disc 4 is provided above the valve seat, the first valve disc is driven by a first valve stem 5, the first valve stem extends from a first valve cover 8, a first sleeve 9 extends axially from the center part of the first valve cover 8, a first sealing ring 6 is provided between the lower part of the first sleeve and the first valve stem, the first valve cover is connected to the upper first flange 7 of the valve body, a first sealing ring 12 is provided between the first valve cover and the first flange, the upper part of the first sleeve 9 has an internal thread, and the upper part of the first valve stem has an external thread 10 that cooperates with the internal thread.

[0010] A hand wheel 11 is connected to the top end of the first valve stem 5. Turning the hand wheel can raise or lower the valve stem to open or close the stop valve.

[0011] A second valve disc 13 is provided below the valve seat and is connected to a second valve stem 17. The second valve stem extends downward from a second valve cover 16. A second sealing ring 14 is provided between the second valve stem and the second valve cover. The second valve cover is connected to a second flange 15 at the lower part of the valve body. A second sealing ring 22 is provided between the second valve cover and the second flange. A spring 18 is sleeved on the portion of the second valve stem extending out of the second valve cover, and a nut 19 for pressing the spring is screwed onto the lower end of the second valve stem.

[0012] The second valve disc, the second valve stem, the spring and the nut constitute a flow stabilizing device. The flow stabilizing principle is that when the pressure in the water inlet pipe is constant, the water pressure on the second valve disc is balanced by the elastic force of the spring, the position of the second valve disc does not change, and the flow rate of the outlet pipe is the set value.

[0013] When the pressure in the water inlet pipe increases, the flow rate in the water outlet pipe tends to increase, but the water pressure on the second valve disc is greater than the elastic force of the spring, and the second valve disc will move toward the valve seat, making the water flow channel between the second valve disc and the valve seat smaller, and the flow rate in the water outlet pipe can be maintained near the set value. During the movement of the second valve disc toward the valve seat, the spring is compressed, and when its elastic force increases to be equal to the pressure on the second valve disc, the second valve disc stops moving.

[0014] When the pressure in the water inlet pipe decreases, the flow rate in the water outlet pipe tends to decrease, but the water pressure on the second valve disc is less than the elastic force of the spring, and the second valve disc will move back toward the valve seat, so that the water flow channel between the second valve disc and the valve seat becomes larger, and the flow rate in the water outlet pipe can still be maintained near the set value. During the movement of the second valve disc back toward the valve seat, the spring stretches, and when its elastic force is reduced to equal to the pressure on the second valve disc, the second valve disc stops moving.

[0015] The compression of the spring can be adjusted through the nut so that the elastic force of the spring adapts to the changes in water pressure in each period. For example, if the average water pressure in one period is low, the compression of the spring can be reduced, and if the average water pressure in another period is high, the compression of the spring can be reduced and increased; this can achieve a better flow stabilization effect.

[0016] When the spring fails, you can just loosen the nut and replace it with a spare spring without closing the upstream valve. The spring replacement operation is convenient.

[0017] To prevent the spring from being damaged by foreign objects, a sheath 21 is extended from the bottom of the second valve cover, and a cap 20 is screwed onto the bottom end of the sheath. The spring and the nut are located in a cavity surrounded by the sheath and the cap.

Claims

1. A stop valve with a flow stabilizing device, comprising a valve body (23), a water inlet pipe (1) provided on the left side of the valve body, a water outlet pipe provided on the right side of the valve body, a valve seat (2) provided on a partition (3) of the valve body, a first valve disc (4) provided above the valve seat, the first valve disc being driven by a first valve stem (5), the first valve stem sealingly extending from a first valve cover (8), the first valve cover sealingly connected to the upper part of the valve body, and characterized in that: A second valve flap (13) is provided below the valve seat. The second valve flap is connected to a second valve stem (17). The second valve stem extends out of a second valve cover (16) in a sealed manner. The second valve cover is sealed and connected to the lower portion of the valve body. A spring (18) is sleeved on the portion of the second valve stem extending out of the second valve cover. A nut (19) for pressing the spring is screwed onto the lower end of the second valve stem.

2. The stop valve with a flow stabilizing device according to claim 1, characterized in that: A hand wheel (11) is connected to the top end of the first valve stem (5).

3. The stop valve with a flow stabilizing device according to claim 1, characterized in that: A sheath (21) extends from the bottom of the second valve cover, a cap (20) is screwed onto the bottom end of the sheath, and a spring and a nut are located in a cavity surrounded by the sheath and the cap.

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