Caleffi 519502A Differential Pressure Bypass Valve

The Differential Pressure Bypass Valve is the essential solution for protecting fixed speed circulating pumps. The Caleffi 519502A model features a 3/4 inch nominal size brass body designed for durable performance, with a temperature range of 32 to 230 Deg F and a pressure rating up to 150 PSI. This by-pass valve helps balance pressure differences and prevent pump overload in domestic and radiant heating systems.

Constructed for reliability, the valve uses corrosion resistant materials and convenient components to ensure smooth operation and easy maintenance. It pairs a brass valve plug with EPDM gaskets and O-rings, plus asbestos-free NBR seals for long life. The stainless steel spring delivers consistent response, while the ABS plastic control knob provides simple manual adjustment.

• Nominal size: 3/4 inch; End connections: Female Threaded Union x Male Threaded Union
• Brass body with stainless steel spring for durability
• Inclusions: Brass Valve Plug, EPDM Valve Plug Gasket, EPDM O-Ring Seal, Asbestos Free NBR Union Seal
• ABS plastic control knob for easy operation
• Flow rating up to 9 GPM
• Application: Fixed Speed Circulating Pump
• Applicable standards: ISO 9001, FM 21654, BSI

Ideal for boiler and hydronic systems requiring reliable differential pressure management and energy-efficient operation.