There are many different types of standard and custom valves on the market, and each valve is designed for a specific type of purpose. Some valves are engineered to allow precise control of the flow of media through a system, while others are used simply to turn the flow on or off.
Other valves, including a vacuum check valve, have a very different purpose. Unlike the valve types mentioned above, these valves work automatically and are not controlled from external automated controls of manual controls in the system. Instead, all types of vacuum check valve designs are developed to operate based on pressure differences in the system. Their role is to open and close to prevent low pressure on the inlet port side of the valve from allowing air back up and into the system. In this way, they are essential to the operation to eliminate the risk of the loss of the vacuum.
Choosing the Best Check Valve
Most, but not all systems using a vacuum check valve are designed with a diaphragm check valve as the component. They can also be designed with a spring closure, which is often a consideration when larger lines are in place, and there is a higher flow of air through the valve.
In choosing a check valve for a vacuum system, preventing any types of leaks in the valve or in the connection of the valve to the inlet and outlet line is critical. Valves that are designed and manufactured as one-piece valves have a much lower rate of failure and can last for extended duty cycles without any loss of performance.
A key factor with any type of check valves is the cracking pressure. This is the pressure that triggers the opening and closing of the valve, and it has to be selected based on the operating pressure and the pressure drops that are found in the specific application.
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