Description
Lennox 18M40 Thermostatic Expansion Valve
The Lennox 18M40 is a precision-engineered Thermostatic Expansion Valve (TXV) designed to deliver accurate refrigerant metering and optimal system efficiency in residential and light commercial HVAC and refrigeration applications. With its robust construction and reliable performance, this OEM-quality valve helps maintain proper superheat levels, protecting the compressor and maximizing system capacity.
Key Features
- Inlet connection: 3/8″ ODF for straightforward field installation
- Outlet connection: 1/2″ ODF for compatibility with standard line sets
- 1/4″ external equalizer port for accurate pressure sensing across the evaporator
- 30″ capillary tube provides flexible bulb placement for precise superheat sensing
- Thermostatic sensing bulb design responds dynamically to evaporator outlet conditions
- OEM replacement part engineered to Lennox specifications
- Suitable for use in split-system air conditioners, heat pumps, and refrigeration equipment
Why Use a TXV?
A Thermostatic Expansion Valve regulates the flow of liquid refrigerant into the evaporator coil based on real-time superheat readings. Compared to fixed orifice metering devices, a TXV continuously adjusts to varying load conditions — improving efficiency, extending equipment life, and maintaining consistent comfort levels.
Application
- Residential and light commercial split-system air conditioning
- Heat pump systems
- Refrigeration equipment requiring precise metering control
- Direct OEM replacement for Lennox systems specifying the 18M40 valve
Specifications
- SKU: 18M40
- Brand: Lennox
- Valve Type: Thermostatic Expansion Valve (TXV)
- Inlet Connection: 3/8″ ODF
- Outlet Connection: 1/2″ ODF
- Equalizer Port: 1/4″ External Equalizer
- Capillary Tube Length: 30″
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