The check valve, or often known as a non-return valve, is a self-operating valve installed in a pipe, tube or line to prevent the flow of the media back through the valve in the system. In other words, the check valve plays an important role in making sure the media only flows one way through the system.
There are several important reasons to use a check valve in any type of system. They are essential in maintaining the pressure through the system and eliminating the risk of contamination that could occur with the media backing up from one part of the process into another.
Depending on where they are positioned in the system, the check valve can also be used as a bypass valve. They are an inline valve, and they have no external control, so they have to be dependable and reliable, even with only infrequent use.
The Addition of PTFE Wetted Surfaces
The advantages of adding a check valve in a system are evident, but selecting the right size and type of valve is always a factor to consider. In any type of application, eliminating any damage to the interior of the valve through corrosion or exposure to acids or chemicals in the media is essential.
Choosing PTFE check valve option is instrumental in eliminating the risk of failure of the check valve within the manufacturer’s stated duty cycle. The PTFE, more commonly known as Teflon coating, creates a surface in the check valve that prevents any corrosion or buildup of the media in the valve.
With the media sliding through the PTFE check valve without the ability to attach to the wetted surfaces, the risk of the valve sticking in the open or closed position is virtually eliminated. The sides of the valve and other components are also protected from corrosion, pitting and flaking, ensuring optimal operation.
It is critical for any PTFE check valve to be selected based on the system temperature, pressure, flow volume, and correct sizing. Matching the valve to the system needs further enhances both the duty cycle and the functioning of the valve.
