Coliter ® Pressure Relief Valve / Pressure Control Valve – PN16, ≤80°C, Hydraulic Self-Control for Water Systems

500X Pressure Relief Valve / Pressure Control Valve – Pilot-Operated Multi-Function Valve for Overpressure Protection or Pressure Holding in Pipelines

The Coliter® 500X Pressure Relief/Pressure Control Valve is a versatile, hydraulically self-operated control valve that functions either as a pressure relief valve (to limit upstream pressure) or as a pressure sustaining (holding) valve (to maintain minimum upstream pressure), depending on pilot configuration. Ideal for water supply networks in high-rise buildings, residential complexes, and municipal projects, it ensures system safety and stability without requiring external power. The valve assembly includes a main valve, pilot valve, needle valve, ball valves, micro filter, and pressure gauges. In relief mode, when inlet pressure exceeds the pilot’s setpoint, the pilot opens to discharge water via ball valve C, reducing pipeline pressure. In holding mode, if upstream pressure drops below the setpoint, the pilot closes to restrict flow and maintain required pressure—typically with ball valve C closed or plugged. The entire system operates using line pressure only, enabling reliable, energy-efficient, and maintenance-friendly performance. 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 exclusively. Available in sizes from DN20 to DN800 with flanged end connections per GB/T 17241.6. By integrating dual functionality into one unit, the 500X simplifies system design while providing critical overpressure protection or pressure stabilization in dynamic water distribution networks.