Coliter ® Flow Control Valve – PN16, ≤80°C, Hydraulic Self-Regulating for Constant Flow in Water Systems

400X Flow Control Valve – Pilot-Operated Automatic Valve Maintaining Predetermined Flow Rate Despite Pressure Fluctuations

The Coliter® 400X Flow Control Valve is a multi-function, hydraulically self-operated valve designed to automatically maintain a constant flow rate in water distribution systems—regardless of upstream or downstream pressure variations. Widely used in high-rise buildings, industrial water supply networks, and pump-fed municipal systems, it ensures stable delivery to terminal units, prevents overflow, and enhances energy efficiency. Unlike conventional throttle valves that waste energy through fixed orifices, the 400X uses a high-precision pilot control system to dynamically adjust the main valve opening, minimizing throttling loss while precisely regulating flow. The valve can also function as an emergency shut-off: during abnormal conditions (e.g., pipe rupture), it fully closes to prevent catastrophic water loss. Key components include a main valve, flow-sensing pilot valve, needle valve, ball valves, micro filter, and pressure gauges. 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. With high control sensitivity, easy commissioning, and long service life, the 400X delivers reliable, intelligent flow management without external power—making it essential for modern variable-pressure water infrastructure.