Automatic Expansion Valve for R404A Refrigeration System

Brass/Copper Material | Hot Gas Bypass | New Condition | For Hotels, Cold Storage, and Farm Cooling Systems

Product Description

The Automatic Expansion Valve (AXV) is a key component in R404A refrigeration and air-conditioning systems, designed to automatically regulate refrigerant flow to maintain constant evaporator pressure and stable system performance under varying load conditions. Unlike thermostatic or electronic expansion valves, the AXV operates purely by pressure balance — making it ideal for systems that require stable evaporator pressure, simple structure, and minimal maintenance.

This valve is manufactured with high-quality brass and copper materials, providing excellent corrosion resistance, durability, and pressure tolerance. It ensures reliable performance in both cooling and hot gas bypass applications. In cold storage, dairy farms, and hotel refrigeration systems, the valve helps to maintain optimal evaporating temperature and prevent compressor overload during low-load conditions.

The hot gas bypass function allows for efficient control of system capacity during light-load or standby periods, improving temperature stability and extending compressor life. The design conforms to industrial standards and is compatible with R404A, R134a, R22, R407C, and other refrigerants upon request.

Key Features & Advantages

• Automatic Constant Pressure Regulation: Maintains stable evaporating pressure independent of load fluctuations.

• Durable Brass & Copper Construction: Provides excellent corrosion resistance and long service life.

• Hot Gas Bypass Function: Prevents short cycling and stabilizes suction pressure during low-load conditions.

• Stable Operation: Reduces system vibration and temperature swings.

• Energy Efficiency: Improves compressor lifespan by avoiding rapid cycling.

• Easy Installation & Maintenance: Compact design, suitable for new systems or retrofits.

• Wide Application Range: Suitable for R404A, R134a, R407C, and R22 refrigeration systems.

• Reliable for Agricultural and Commercial Uses: Commonly used in dairy farms, hotel cooling, and food preservation systems.

Applications

• Hotel and restaurant refrigeration systems

• Cold storage and walk-in freezers

• Farm milk cooling and processing equipment

• Display cabinets and cold rooms

• Ice makers and beverage chillers

• Refrigerated trucks and transport cooling systems

Technical Specifications

Working Principle

The Automatic Expansion Valve maintains constant pressure at the evaporator outlet by balancing refrigerant pressure against a spring-loaded diaphragm.

• When the evaporator pressure drops (due to reduced load), the valve closes slightly, restricting refrigerant flow and maintaining the set pressure.

• When evaporator pressure rises, the valve opens to increase flow, preventing overheating and pressure buildup.
  This mechanical balance ensures consistent evaporator temperature and efficient refrigerant utilization without external control signals or temperature sensing elements.

In hot gas bypass operation, the valve diverts part of the discharge gas back into the suction line or evaporator, maintaining a minimum evaporating pressure during light-load conditions, avoiding compressor cycling, and ensuring system stability.