How does a vertical check valve work?

Check valve (cheek valve): Check valve, also known as check valve or check valve, is used to prevent the backflow of media in the pipeline. The foot valve of the suction off of the water pump also belongs to the category of check valves.

The opening and closing parts rely on the flow and force of the medium to open or close by themselves, so as to prevent the medium from flowing backwards. Check valves belong to the automatic valve category, which are mainly used on pipelines where the medium flows in one direction, and only allow the medium to flow in one direction to prevent accidents.

According to the structure, the check valve can be divided into three types: lifting check valve, swing check valve and butterfly check valve. Lifting check valves can be divided into vertical and horizontal types. There are three types of swing check valves: single-petal, double-petal and multi-petal.

The butterfly check valve is a straight-through type, and the above check valves can be divided into three types: threaded connection, flange connection and welding.

To put it simply, when the liquid flows, the pressure flushes the valve open. When it doesn't flow, the reverse liquid can't rush through the valve, and you can understand it as a one-way door with a spring, and the person pushes the door forward and walks forward. But on the other side of the door, you can't push, you can only pull to get through.

Italian OR check valve, relying on the flow of the medium itself and automatically opening and closing the valve disc, is used to prevent the medium from backflowing, also known as check valve, check valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve, and its main function is to prevent the backflow of the medium, prevent the pump and the drive motor from reversing, and the discharge of the container medium. Check valves can also be used on lines that supply auxiliary systems where pressure may rise above the system pressure.

Check valves can be mainly divided into swing-type check valves (rotating according to the center of gravity) and lifting check valves (moving along the axis).

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I believe that many people do not know much about the check valve, in fact, the check valve has a strong practicability, and rich functions, can ensure the normal use of mechanical functions, can effectively protect the safe use of equipment. The following is an introduction to the difference between horizontal check valve and vertical valve.

1. What is the difference between horizontal check valve and vertical valve?

1. The horizontal check valve is installed in the horizontal pipeline; Whereas the vertical type is installed in a vertical pipe. 2. The horizontal check valve is placed horizontally; The vertical type is placed vertically and is designed with pipes. 3. The horizontal check valve is to avoid the backflow of the pipeline medium, and the opening and closing parts are automatically opened and closed by the flow of the medium and gravity, while the vertical type inhibits the external force of the spring to make the valve open and close because of the pressure of the medium at the inlet end of the pipeline.

2. What are the selection criteria for check valves?

1. In order to prohibit the flow of medium in the opposite direction, check valves need to be installed in facilities, devices and pipelines;

2. Check valves are usually suitable for clean media, not for media with solid particles and great viscosity;

3. Usually horizontal lifting check valves should be used on horizontal pipelines with a nominal diameter of 50 mm;

4. The horizontal lifting check valve can only be installed in the horizontal pipeline;

5. For the inlet pipeline of the pump, it is suitable to use the bottom valve, which is usually only installed on the vertical pipeline of the pump inlet, and the medium flows from the bottom to the top;

6. The performance of the lifting type is better than that of the rotary type, the fluid force is large, and the horizontal type is suitable for installation on the horizontal pipeline, and the vertical type is installed on the vertical pipeline;

7. The installation direction of the swing check valve is not restricted, it can be installed on horizontal, vertical and inclined pipelines, such as installed on vertical pipelines, the direction of medium flow is from bottom to top;

8. The swing check valve is not suitable for making small-diameter valves, and can be made into a large working pressure, the nominal pressure is 42MPa, and the nominal diameter can not be large, generally reaching more than 2000.

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Abstract:Lifting check valve is a commonly used check valve, it can be divided into vertical check valve and horizontal check valve, the principle and function of these two check valves are almost the same, the main difference is in the installation, vertical check valve is vertically placed on the vertical pipeline, and the horizontal check valve is horizontally placed on the horizontal pipeline, which is better mainly depends on the specific application use. Whether it is vertical or horizontal, it is usually designed with pipes, and the two are not universal and cannot be installed interchangeably.

Let's take a look at the difference between vertical check valve and horizontal check valve. 1. What is the difference between vertical bend return valve and horizontal check valve?

Check valve is a kind of valve products that rely on their own weight and medium pressure to produce action to block the backflow of medium, lifting check valve is a more common structural form, it can be divided into vertical and horizontal two, so what is the difference between vertical and horizontal check valve?

Vertical check valve and horizontal check valve are both lifting check valves, there is basically no difference between the two in terms of structural principle and function, the main difference is that the vertical check valve is installed on the vertical pipeline, while the horizontal check valve is installed on the horizontal pipeline; When installed, vertical check valves are generally placed vertically, while horizontal check valves are placed horizontally.

In addition, there is basically no difference between the two to bury hunger, so which is better, vertical check valve or horizontal check valve?

Second, the check valve vertical type or horizontal type is better.

There are two kinds of check valves, vertical and horizontal, which is better mainly depends on the specific application, under normal circumstances, the effect of the two check valves is almost the same, but it is better to use vertical check valves when used in liquid flow system pipelines.

The above is in the case of the same specification material, when the actual choice, you can put the key performance technical indicators of each phase of the product given by the check valve manufacturer together for comparison to determine which check valve is better.

3. Can the vertical and horizontal type of check valve be used?

The functions and principles of vertical check valves and horizontal check valves are the same, but the installation methods and suitable pipelines are different, so are the horizontal and vertical check valves interchangeable?

In general, whether it is a vertical check valve or a horizontal check valve, it is designed together with the pipeline, and the two valves are not universal, so one of them should be selected according to the installation location and the situation of the pipeline.

Working principle: under the action of the fluid pressure flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the fluid pressure and the self-closing disc of the disc act on the valve seat, thus cutting off the flow.

Among them, check valves belong to this type of valve, which includes swing check valves and lifting check valves. The swing check valve has a medium hinge mechanism and a door-like disc resting freely against the sloping seat surface.

In order to ensure that the disc reaches the right position on the seat surface every time, the disc is designed with a hinge mechanism so that the disc has enough room to swing and that the disc is in true and full contact with the seat.

The disc can be made entirely of metal, or it can be inlaid with leather, rubber, or synthetic overlay, depending on the performance requirements.

When fully open, the fluid pressure is virtually unhindered, so the pressure drop through the valve is relatively small. The disc of the lift check valve is located on the seat seal on the valve body.

Except for the disc that can be raised and lowered freely, the rest of the valve is like a globe valve, the fluid pressure lifts the disc from the sealing surface of the valve seat, and the backflow of the medium causes the disc to fall back to the valve seat and cut off the flow.

Depending on the conditions of use, the disc can be an all-metal construction or in the form of a rubber pad or rubber ring inlaid on the disc holder. Like the globe valve, the passage of the fluid through the lift check valve is narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is rarely limited by the old stove.