What is a Check Valve?

A check valve is a mechanical mechanism that only enables fluids to flow in one direction at a time. They have two ports, one for the media to be fed into and another for the media to be fed out of them. As a result of the fact that they only allow material to flow in one direction, they are often referred to as “one way valves” or “non return valves.” The primary function of a check valve is to prevent backflow of fluid through the system. Figure 1 depicts an illustration of a check valve.

A check valve’s ability to function is dependent on the presence of a pressure differential. To open the valve, they demand a greater amount of pressure on the input side of the valve than on the output side of the valve. When the pressure on the outlet side is greater than the pressure on the input side (or when the input side pressure is insufficient), the valve will close. The closure mechanism varies depending on the type of valve being utilised. In contrast to other valves, they do not require the use of a handle, lever, actuator, or a human to function properly.

The majority of the time, they are put in applications where backflow would cause a problem. However, because they are non-return valves, they offer a cost-effective, simple, and quick solution to a possible problem. It is possible for backflow to produce problems if the backflow is contaminated and, as a result, contaminates the medium upstream. For example, a non-return valve will be installed in a sewer pipe to ensure that waste can exit the system but cannot be re-entered. Furthermore, they are used when the presence of backflow will cause harm to downstream equipment that can only allow media to flow in one direction. For example, because a reverse osmosis filter can only allow water to pass through it in one direction, a one-way valve is put downstream to prevent this from happening.. There are check valves malaysia comes in a variety of sizes, designs, and materials, ensuring that there is one for every purpose.

Cracking Force

Unblocking a check valve requires a minimum upstream pressure (pressure difference between input and exit). The check valve ‘cracking pressure’ is the minimal upstream pressure at which the valve opens. It is important to check that your system can create this cracking pressure and that it is adequate for the application.

Closing

The valve closes if the upstream pressure falls below the breaking pressure or if there is back pressure (flow from the outlet to the inlet). The closing mechanism of a check valve varies. This forces a gate, ball, diaphragm or disc against the aperture, sealing it. Depending on the design, a spring or gravity can help close the door.

Orientation

It is critical to know the proper installation orientation for a one-way valve. An arrow on the valve casing indicates the flow direction. If not, check that the valve is installed in the intended flow direction. If it’s reversed, no flow will occur and pressure will build up, causing damage.
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