Magnetic Pump Recommendation for Refrigerant R134a

Email: sales01@cxflowmeter.com

WhatsApp: +86 180 4984 1995

1. Understanding the Requirements

Medium: Refrigerant R134a (1,1,1,2-Tetrafluoroethane) is a widely used HFC refrigerant known for its low toxicity and ozone-depletion 

potential (ODP = 0). It is commonly used in air conditioning, refrigeration, and heat pump systems.

Flow Rate: 0.1–0.6 L/min – This is a relatively low flow rate, typical for precision metering applications.

Temperature: 25°C – At this temperature, R134a is in a gaseous state under standard pressure but may be in a liquid state under the operating 

pressure (since the pump must withstand 3 MPa).

Viscosity: 195 μPa·s (0.195 cP) – This is a very low viscosity, similar to water (1 cP at 20°C), which means the pump must be designed for

 low-viscosity fluids.

Pressure Requirements:

Pump Body Pressure Rating: 3 MPa (30 bar) – This is a high-pressure requirement, indicating the pump must be robust enough to handle

 elevated pressures.

Outlet Back Pressure: 5 bar – The pump must be capable of overcoming this back pressure while maintaining the desired flow rate.

Size Constraint: The pump must be as small as possible, likely for integration into a compact system.

Motor Quality: A good motor is required, likely for precision control, energy efficiency, and reliability.

2. Why a Magnetic Pump?

Leak-Free Operation: Magnetic drive pumps (mag-drive pumps) are ideal for handling refrigerants like R134a because they eliminate the 

need for dynamic seals (e.g., mechanical seals), which can be prone to leakage, especially with low-viscosity fluids.

Corrosion Resistance: R134a is chemically stable but may require materials compatible with refrigerants (e.g., stainless steel, PTFE, or other

 fluoropolymer components).

Precision Metering: Magnetic pumps can be designed for precise flow control, which is essential for refrigerant metering applications.

3. Recommended Pump: 0.6-57 High-Pressure Model with Servo Motor

Model Number (0.6-57): This likely refers to a specific series or size within the manufacturer's lineup, designed for high-pressure, low-flow

 applications.

0.6: May refer to the maximum flow rate (0.6 L/min) or another performance parameter.

57: Could indicate a design feature (e.g., impeller size, motor power, or pressure rating).

High-Pressure Design: The pump is rated for 3 MPa (30 bar), meeting the customer's requirement.

Servo Motor:

Precision Control: A servo motor allows for precise speed and torque control, which is essential for maintaining a stable

 flow rate (0.1–0.6 L/min).

Energy Efficiency: Servo motors are more efficient than standard AC/DC motors, especially under variable load conditions.

Compactness: Servo motors can be designed to be compact, fitting the customer's size constraint.

Materials: The pump is likely constructed from materials compatible with R134a (e.g., stainless steel, PTFE diaphragms, or EPDM seals).

4. Key Considerations for the Customer

Flow Control: The pump must be paired with a suitable controller (e.g., a variable frequency drive or a dedicated flow controller) to achieve

 the 0.1–0.6 L/min range.

NPSH (Net Positive Suction Head): Ensure the pump is designed to handle the vapor pressure of R134a at 25°C (0.66 MPa absolute pressure)

 to avoid cavitation.

Temperature Stability: The pump should maintain performance at 25°C, though R134a's properties are relatively stable in this range.

Mounting and Integration: The compact size and servo motor make it suitable for integration into refrigeration systems, but mounting

 orientation (horizontal/vertical) should be confirmed.

5. Why Not Other Pump Types?

Diaphragm Pumps: While suitable for low flows, they may struggle with high pressure (3 MPa) and precision metering.

Gear Pumps: Can handle high pressure but may have higher pulsation and leakage risks with low-viscosity fluids.

Centrifugal Pumps: Not ideal for low flows (0.1–0.6 L/min) and may not meet the pressure requirement.

6. Final Recommendation

The 0.6-57 high-pressure magnetic pump with servo motor is a well-suited choice for the customer's needs:

High Pressure: 3 MPa rating ensures safety under elevated conditions.

Low Flow, Precision Metering: The servo motor allows for accurate flow control in the 0.1–0.6 L/min range.

Compactness: Meets the size constraint for integration into refrigeration systems.

Reliability: Magnetic drive eliminates leakage risks, and the servo motor ensures long-term, efficient operation.

7. Contact Information

For similar inquiries or custom solutions, the customer can reach out to:

Email: sales01@cxflowmeter.com

WhatsApp: +86 180 4984 1995

This recommendation balances performance, reliability, and compactness, making it an excellent fit for refrigerant R134a metering

 applications.