Product details
2028E/4S09 PWM Expansion Valve CO₂ | 1/2″ x 5/8″ ODS | Without Coil | Castel
The Castel 2028E/4S09 PWM Expansion Valve is a specialized electronic expansion valve designed for CO₂ (R744) refrigeration systems. It operates using PWM (Pulse Width Modulation) technology, allowing precise control of refrigerant flow for high-efficiency system performance.
This model is supplied without coil (S version) and features orifice size 09, making it suitable for defined capacity ranges in CO₂ applications. Built for high-pressure environments, it ensures safe and reliable operation in modern refrigeration systems.
As shown in the datasheet, the valve is specifically engineered for R744 systems and offers high pressure resistance along with accurate flow control .
Key Benefits
Designed specifically for CO₂ (R744) systems
PWM-controlled operation for precise flow regulation
Supplied without coil for flexible configuration
Orifice size 09 for controlled capacity range
High pressure rating up to 90 bar
Reliable performance in transcritical CO₂ systems
Compact and efficient design
Specifications
Brand: Castel
Model: 2028E/4S09
Product Type: PWM Expansion Valve (CO₂)
Connections
Inlet Connection: 1/2″ ODS
Outlet Connection: 5/8″ ODS
Performance
Orifice Type: 09
Flow Coefficient (Kv): 0.25 m³/h
Electrical
Coil: Not included (S version)
Pressure & Temperature
Maximum Working Pressure (PS): 90 bar
Maximum Working Pressure (MWP): 1305 psi
Minimum Temperature: -50°C
Maximum Temperature: +100°C
Compatibility
Refrigerant:
CO₂ (R744)
Applications
CO₂ refrigeration systems
Transcritical refrigeration systems
Supermarket refrigeration
Industrial CO₂ cooling systems
Advanced HVAC applications
FAQs
What refrigerant is this valve designed for?
It is specifically designed for CO₂ (R744) systems.
Does this valve include a coil?
No, this is the S version supplied without a coil.
What type of control does it use?
It uses PWM (Pulse Width Modulation) for precise refrigerant control.
What are the connection sizes?
It has a 1/2″ ODS inlet and 5/8″ ODS outlet.
What is the pressure rating?
It supports up to 90 bar (1305 psi).
