Silicon Expansion Valve

Overview
The precise thermal actuation of silicon makes silicon-based micro-electromechanical systems (MEMS) ideal actuators for proportional refrigerant expansion valves. Microstaq's Silicon Expansion Valve (SEV) series uses proven MEMS technology to provide the following capabilities.

  • Proportional refrigerant flow control
  • Fast response to changing operating conditions
  • Simple electronic control
  • Compatibility with HCFC and HFC/blend refrigerants
  • Diagnostics capabilities


Benefits
Microstaq's technology and product capability aligns well with the global trends in HVAC and refrigeration, allowing manufacturers and retailers to provide:

  • More energy efficient systems
  • Lower maintenance
  • Improved system reliability
  • Wider capacity range


Ideal Applications

Specifications

Compatible Refrigerants

R410A; R407C; R404A; R134A; R22

Compatible Oils

Polyolester, Alkylbenzene, Mineral

Response Time

0.25 seconds

Power Consumption

12 watts; 6 watts at steady state (in N2)

Voltage

12 or 24V

Maximum Operating Pressure

500 Psig (34.7 Bar)

Maximum Working Pressure

650 Psig (44.8 Bar)

Burst Pressure

1500 Psig (105 Bar)

Life Cycle

Minimum 1 million cycles

Resolution Range (2 ton+)

0.5 PWM step from 25% to 85%

Resolution Range (<2 ton)

0.5 PWM step from 25% to 55%

Valve Shutoff Leakage

< 7L/m at 100Psig nitrogen

Refrigerant Temperature

-40°F to 155°F (-40°C to 70°C)