Check valves are used in virtually all types of applications. They are called by many different names including one-way valves, non-return valves and even a clack valve, which is a very descriptive name based on the sound these valves can make when closing.
The function of the check valve is to allow a liquid or a gas, or sometimes slurries and other types of media, to flow in one direction only through the valve. This prevents the media in the system from reversing direction if there is a pressure drop on the inlet side of the valve. They can be used in general plumbing systems, in processing systems, and in high purity systems. In high purity applications, a PTFE check valve is the most common option.
The design of the check valve is generally very simple with one inlet and one outlet port. The interior of the valve can be configured differently and may use a ball, diaphragm, swinging or hinged discs or other less common types of configurations. The valve works automatically, without the need for operator control or management.
Materials to Consider
As the check valve is an essential safety component in any system, ensuring the valves are dependable, reliable and have a long duty cycle is critical. A PTFE check valve is particularly beneficial in any application where corrosion or build-up of material in the valve is a concern.
PTFE or polytetrafluoroethylene is highly resistant to corrosion, provides an inert and non-reactive surface, and is extremely resistant to any type of adhesion of materials to the valve.
The PTFE check valve is also resistant to temperature changes in both the media as well as the ambient temperature. It is resistant to shock and stress and, with correct installation, offers a leakproof valve that provides years of reliable operation.
