The ETS PJ1242-400 is an electric expansion valve engineered for precision liquid injection in evaporator circuits within air conditioning and refrigeration systems. Built around a balanced piston and linear positioning design, it delivers modulating control via stepper motor actuation and enables bi-directional flow operation with solenoid-actuated tight shut-off in both directions. The bi-polar permanent magnet stepper motor accepts chopper drive or constant voltage drive input, making it compatible with major electronic control platforms.
## Technical Specifications
**Electrical**
• Stepper Motor: Bi-polar, permanent magnet
• Phase Current (chopper drive): 100 mA RMS (−4% to +15%)
• Constant Voltage Drive: 12 V DC (−4% to +15%), 150 steps/sec
• Motor Enclosure: IP67 rated
• Connection: M12
**Flow & Pressure**
• Max. Opening Pressure Differential (normal flow): 33 bar (478.6 psi)
• Max. Opening Pressure Differential (reverse flow): 10 bar (145 psi)
• Max. Working Pressure: 34 bar / 493 psig
• Orifice Size: 17.2 mm (0.7 in.)
• Operation: Bi-flow capable with tight shut-off in both directions
**Physical**
• Body Material: Brass
• Connections Material: Copper
• Connection Size: 1 5/8 × 1 5/8 ODF (42 × 42 mm)
• Built-in sight glass with moisture indicator
• Corrosion-resistant internal and external design
## Key Features
• Modulating control via spindle-driven stepper motor
• Balanced piston design enabling bidirectional operation
• Solenoid tight shut-off function in both flow directions
• Chopper drive or constant voltage drive compatibility
• IP67-rated motor enclosure
• Integrated moisture indicator sight glass
## Refrigerant & Oil Compatibility
• Refrigerants: R410A, R407C, R404A, R507, R134a, R448A, R449A, R22, R1234ze (R744/CO₂ special valves available)
• Oils: Compatible with mineral and ester oils
## Typical Applications
• Precision evaporator liquid injection in air conditioning systems
• Refrigeration circuit expansion control
• Applications requiring modulating flow regulation and bidirectional capability
## Compatibility & Integration
The ETS PJ1242-400 integrates with electronic control solutions from Danfoss and compatible third-party manufacturers (EKC 316A, EKC 312, EKD 316). AST-g service driver available for manual operation.
