A Pilot Operated Non Return Valve controls a limited-flow control feed to a separated piloted valve. It is good for controlling high pressure / high flow feed. These valves are frequently used in critical applications (safety & emergency controls). They normally allow fluids only in one direction. Non return valve is designed to keep a cylinder in a specific position. This can be used as a shut-off valve. The product is ideal for high pressure, high volume flow, and mounting between lines. It is highly useful in keeping the pressure.