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4057 / 4457 Manual & Pilot Operated 3-Way Pilot Valves

SKU 4057-4457

AMOT Models 4057 and 4457 3-way valves have been developed for use in manual and automatic hydraulic or pneumatic control systems. They offer versatility in operating requirements and allowable pressure limits. For a 1/4” size control valve, they offer exceptional flow capacity.

Note: This product replaces model 4459.

Features and Benefits 

  • Balanced force design pressure
  • Can be applied to any port center dead spot-std
  • Port overlap-optional
  • Arranged for panel or bracket mounting
  • Available in Aluminum or 316 Stainless Steel
Body material: 4057 Precision cast aluminum
  4457 Stainless steel
Standard spool material: Anodized aluminum
Standard seal material: Viton  
Max. pressure at Ports 1,2 or 3: 860 kPa 125 psi
Max. pressure at Ports A or B: 1034 kPa 150psi
Max. pressure at Port C: 860 kPa 125 psi
  • Hydraulic Fluid Control

  • Actuator Control

  • Pneumatic Panel Systems

  • Safety Control Systems


The 3-way pilot valves feature modular construction and incorporate a sliding spool. The standard spool has a small center dead spot position and no valve port overlap. With the spool fully to the left (rest position), Port 2 is open to Port 3 and Port 1 is closed. With the spool moved to the right (actuated position), Port 2 is open to Port 1 and Port 3 is closed. The valves are available with a variety of manual and pressure operators and with manual, pressure or spring returns.