Coliter ® Slow Closing Check Valve – PN16, ≤80°C, Hydraulic Automatic for Water Hammer Prevention

300X Slow Closing Check Valve – Pilot-Operated Non-Return Valve with Controlled Closing Speed to Eliminate Water Hammer in Pump Systems

The Coliter® 300X Slow Closing Check Valve is a hydraulically operated, non-return valve designed to prevent backflow while eliminating damaging water hammer through controlled, two-stage closing. Unlike conventional swing or lift check valves that slam shut during pump shutdown—causing pressure surges—the 300X uses an integrated hydraulic control system to achieve optimal closing speed: rapid initial closure followed by a slow, cushioned final seal. This significantly reduces noise, vibration, and stress on pipelines and equipment. The valve assembly includes a main valve, one-way valve, needle valve, ball valve, micro filter, and pressure gauges. During normal flow, water enters the main valve’s control chamber via the micro filter and needle valve; when flow stops or reverses, the ball valve drains the chamber at a controlled rate (adjusted via the needle valve), allowing the main disc to close smoothly. Constructed from ductile iron or cast steel, rated at PN16 (1.6 MPa), and suitable for media temperatures up to 80°C, it handles clean water only. Available in sizes from DN20 to DN800 with flanged end connections per GB/T 17241.6. Widely installed downstream of pumps in high-rise buildings, municipal water networks, and industrial systems, the 300X ensures safe, quiet, and reliable backflow prevention—protecting infrastructure and extending system life.