Thermal Expansion Valves (TXV)

Thermal Expansion Valves (TXV)

 Thermal Expansion Valves (TXV) in Refrigeration and Air Conditioning Systems

Introduction

Thermostatic Expansion Valves (TXV) are used to regulate the flow of coolant to the evaporator, helping to improve the efficiency of cooling and air conditioning systems. These valves come in two major types of equations:

External Equalizer: Used in systems with very low pressure in the evaporator.

Internal Equalizer: Suitable for small systems where pressure bands inside the evaporator are limited.

Valve models and their specifications

1. STE-X-6 Valve

Equalizer: Outer

Operating range: -40°C to +10°C

Ability according to the type of Freon:

R22: 16.87 kW

R134a: 9.50 kW

R407c : 16.40 kW

R404a : 12.16 kW

2. SME-X-4 Valve

Equalizer: Outer

Operating range: -40°C to +10°C

Ability according to the type of Freon:

R22: 8.43 kW

R134a: 6.20 kW

R407c : 8.80 kW

R404a : 8.40 kW

3. NRF-3 Valve

The Equator: Inside Me

Operating range: -40°C to +10°C

Ability according to the type of Freon:

R410a: 7.04 kW

R134a: 3.52 kW

R22 : 5.28 kW

R407c : 5.28 kW

R404a : 3.52 kW

4. RTBM-2 Valve

Equalizer: Outer

Operating range: -40°C to +10°C

Ability according to the type of Freon:

R22: 49.30 kW

R407c : 49.30 kW

R134a: 27.10 kW

R404a : 37.00 kW

R410a : 59.20 kW

5. RTE-1 Valve

Equalizer: Outer

Operating range: -40°C to +10°C

Ability according to the type of Freon:

R410a: 3.52 kW

R134a: 0.88 kW

R22: 1.76 kW

R407c : 1.76 kW

R404a : 1.17 kW

6. NRF-12 Valve

The Equator: Inside Me

Operating range: -40°C to +10°C

The ability :

R410a: 42.24 kW

7. ST-X-2 Valve

The Equator: Inside Me

Operating range: -40°C to +10°C

Ability according to the type of Freon:

R22: 3.37 kW

R134a: 2.50 kW

R407c : 3.35 kW

R404a : 3.30 kW

8. CRFE-12 Valve

Equalizer: Outer

Operating range: -40°C to +10°C

Ability according to the type of Freon:

R22: 26.5 kW

R407c : 25.5 kW

R134a: 14.6 kW

R404a : 21.1 kW

R410a : 31.7 kW

R290 : 15.9 kW

The difference between an internal and external equator

Internal Equator: Used when the pressure bands in the ev