There are different types and designs in check valves or one-way valves. These valves are designed to prevent backflow through the system at the point of the valve. The specific design, including the poppet check valve, offers specific advantages when used in systems and equipment that operate using both high and low pressures as well as high and low temperatures.
In general, the quality poppet check valve operates on pressure in the system. Carefully choosing the valve to meet the operational pressure and the cracking pressure, or the pressure at which the valve opens is essential to optimize performance.
How They Work
As with most types of check valves, a poppet check valve uses a similar operation to a ball check valve to control pressure and to prevent backflow in the event of inlet side pressure drops. The poppet is held in place by a spring, and the spring is designed with a specific cracking pressure in mind.
The spring exerts pressure on the poppet until the specific minimum cracking pressure is reached in the system. At this time, the pressure in the system pushes back on the poppet and the spring, opening the valve and allowing the flow of the air or media through the system. The valve stays open as long as the minimum cracking pressure is maintained, closing if it drops.
Most of the designs of these valves are simple, ensuring the interior of the valve does not require maintenance, ensuring the valve works even when open or closed for long periods of time.