expansion units

What Are Expansion Valves in a Refrigeration System?

In a refrigeration system, the expansion valve, commonly referred to as a thermostatic expansion valve (TXV), manages the flow of refrigerant into the evaporator. It lowers the refrigerant's pressure and temperature to promote evaporation and heat absorption.

Function: The main function of the expansion valve is to control the quantity of refrigerant entering the evaporator. This regulation ensures efficient cooling while preventing problems such as liquid refrigerant flooding the compressor.

Location: The expansion valve is strategically located in the liquid line, positioned between the condenser and the evaporator inlet.

Common types of expansion units include:

  • Thermostatic Expansion Valves
  • Electronic Expansion Valves
  • Automatic Expansion Valves
  • Capillary Tubes

Let’s dive into this chapter with the essential details.

Thermostatic Expansion Valve

THERMOSTATIC EXPANSION VALVE

What Are Expansion Valves ? A thermostatic expansion valve (TXV) is a crucial device in a refrigeration system that decreases the pressure of the refrigerant liquid received from the condenser.

Learn More
Electronic Exp

ELECTRONIC EXPANSION VALVE

What is an Electronic Expansion Valve? An Electronic Expansion Valve (EEV) is a crucial component in refrigeration systems that accurately regulates refrigerant flow into the evaporator. It utilizes an electronic controller and a stepper motor, providing enhanced precision and efficiency compared to traditional Thermostatic Expansion Valves (TXVs).

Learn More
Automatic Exp

AUTOMATIC EXPANSION VALVE

What is an Automatic Expansion Valve? An automatic expansion valve (AEV), often referred to as a constant pressure expansion valve, is a component utilized in refrigeration and air conditioning systems to control the flow of refrigerant and uphold a steady evaporating pressure within the evaporator. Unlike thermostatic expansion valves (TXVs), which rely on an external thermal sensing device, AEVs modify the valve opening based solely on the evaporator pressure.

Learn More
Capillary

CAPILLARY TUBES

What are Capillary Tubes in HVAC? In refrigeration systems, a capillary tube is a slender, elongated tube utilized as a throttling device to regulate the flow of refrigerant from the condenser to the evaporator, effectively lowering its pressure and temperature.

Learn More

Frequently Asked Questions

Who is Compress India, and what sets you apart?▼

Compress India has grown from humble beginnings into a respected leader in industrial HVAC and customized cooling solutions. With over 30 years of experience, we deliver turnkey systems, chillers, and bespoke services across diverse industries, underpinned by innovation, customer satisfaction, and trust.

What industries do you serve?▼

We’re proud to serve a wide range of sectors, including pharmaceuticals, healthcare, IT, telecommunications, logistics, warehousing, steel, textiles, chemicals, food processing, finance, and educational institutions—tailoring solutions to meet each industry's unique needs.

What services do you provide?▼

We offer end-to-end HVAC services, including system design, installation, turnkey project execution, chiller and VRV/VRF system solutions, ducting, fabrication, automation, electrical works, and industrial refrigeration. Whether it’s a small requirement or a large-scale project, we deliver reliable, energy-efficient, and cost-effective solutions.

Do you provide customized HVAC solutions?▼

Yes. Every client has different needs, and we specialize in offering tailored services—ranging from inspection and preventive maintenance to upgrades like insulation replacement, motor servicing, and specialized fabrication. Our customized approach ensures you get solutions that truly fit your operations.

What common AC problems do you address?▼

We handle issues like water leakage (caused by clogged drains or trays), poor airflow (due to dirty filters or fan faults), and cooling failures (caused by refrigerant leaks, outdoor unit problems, or electrical issues). Our expert technicians ensure quick, lasting fixes for all major and minor problems.

How can I reduce AC energy consumption?▼

We recommend regular servicing, using the timer function, keeping rooms sealed, and setting the temperature to 24 °C for maximum efficiency. Upgrading to inverter ACs with higher star ratings is also an effective long-term solution for reducing energy bills.

What is the lifespan of an AC system?▼

On average, centralized HVAC systems last 10–15 years, while room or split AC units run efficiently for 3–6 years under normal daily usage. With regular servicing and proper care, their lifespan can be extended.

How do you ensure quality in your HVAC projects?▼

Every project we undertake goes through strict quality checks at every stage—right from design to installation and maintenance. We use trusted brands, follow industry standards, and our team of skilled engineers ensures that the systems are safe, reliable, and long-lasting.

Do you provide consultation before starting a project?▼

Yes. We believe every client has unique requirements, so we offer detailed consultation and site inspections before starting any project. This helps us understand your needs better and design a solution that balances performance, cost-efficiency, and sustainability.

Can businesses upgrade their existing HVAC systems with you?▼

Absolutely. We specialize in retrofitting and upgrading older HVAC systems with the latest technology. Whether it’s energy-efficient chillers, modern ducting, or smart automation, we help businesses transition to advanced systems without disrupting ongoing operations.