Confirm the exact configuration
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

Festo
The Festo part number 557775 is a pilot-controlled diaphragm regulator featuring a 3-way proportional pressure control valve function with a 5 mm nominal width pressurization and a 2.5 mm exhaust nominal width. This electrically actuated component operates within a DC voltage range of 21.6 V to 26.4 V, utilizing a soft sealing principle, a mechanical spring reset method, and an integrated LED indicator with a 3-digit display. It provides a pressure regulation range of 0.06 bar to 6 bar, an inlet pressure range of 6 bar to 8 bar, a normal nominal flow rate of 800 l/min, and a maximum pressure hysteresis of 0.03 bar, complete with short-circuit and reverse polarity protection for all electrical connections. Please submit the exact part number, quantity, and application requirements to request a quote.
Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Festo references — within one business day.
For a faster response, include quantity, condition, and delivery destination.
Verified configuration
Engineering context
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.
Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.
Our sourcing response is prepared against Festo 557775. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.