A thermostatic expansion valve is a useful piece of equipment that regulates pressure and temperature in a hydronic heating system. It makes the system safer and more efficient by reducing the backflow into the boiler and preventing damage to sensitive components.
At Reliable Ducts Heating & Cooling, we offer TEV services such as installations, repairs, maintenance, and replacements. When your TEV needs attention, you can count on us to provide top-notch inspections and diagnostics. Whether you’re looking for a new TEV for your system or you simply need a few repairs, we’re the ones to call.
What Do Thermostatic Expansion Valves Do?
TEVs are commonly used to control hot water and steam. In simple terms, TEVs are valves with multiple functions. They act as a check valve, shut-off valve, pressure controller, and thermostat in one device.
Check valves prevent backflow, while shut-off valves allow you to turn the hot water on or off. Pressure controllers reduce pressure to prevent damage to equipment. They also reduce pressure in the event of high pressure to prevent blowback.
Thermostats use a heating element and probe to measure the temperature and turn the valve on or off accordingly. The thermostatic expansion valve is most commonly used with hydronic heating systems such as hot water heaters or boilers.
When using gas as a heat source, this device can be replaced with a manual or automatic gas control valve. In other words, it’s not mandatory but recommended for the optimal performance of your system.
How Does a Thermostatic Expansion Valve Work
A TEV is used to control pressure and temperature in a hydronic heating system by regulating the flow of water or steam to a boiler. It has two main components: a nozzle and a thermostat. The nozzle is installed in the system’s water supply line, and the thermostat is installed in the water return line.
The water enters the nozzle, and the pressure of the system pushes the water through the nozzle and into the return line. The hot water is then delivered to the circulation pump, and the return line is sent back to the boiler. As the water travels to the boiler, it is heated by the boiler’s water.
The nozzle acts as a restriction in the line that allows the water to enter the return line under a predetermined amount of pressure. The thermostat in the return line acts as a pressure controller and temperature sensor. The boiler’s temperature is also monitored.
Why Are Thermostatic Expansion Valves Important?
They are important for a number of reasons. They help prevent low and high water pressures, which can cause damage to equipment. TEVs prevent blowback, which happens when the water pressure exceeds 100 pounds per square inch in residential systems.
They also help prevent scalding by regulating the temperature of the water. The pressure in a hydronic heating system is controlled by the amount of flow to the boiler. The more flow there is, the higher the pressure.
If you have low water pressure, it’s usually due to the boiler not receiving enough flow. In this case, the water stays in the system too long. If the pressure exceeds 100 psi, then there is possibly an issue with the system.
Tev Maintenance
A trained professional can help you maintain the functionality of your TEV. An HVAC technician can clean the nozzle once a year by removing it from the line and running water through it. This will allow a slow and steady flow of water through the nozzle, which will prevent erosion.
You should also have a technician replace the nozzle every five years or when there are signs of wear and tear. Your technician should make sure to replace the existing nozzle with exactly the same model.
It’s important to know that if the nozzle is not closing properly, it might also be a sign that your thermostat needs replacement.
Thermostat Replacement
If the nozzle is working just fine, but you still need to replace the thermostat, a technician can get to the root of the problem by shutting off the system. Then, he or she will remove the old thermostat and check the gauge on the side if there is one.
Next, the technician will install the new thermostat and place it in the return line where the old one was. The new thermostat should be the same model and have the same settings as the old one.
If you notice that the new thermostat isn’t working as efficiently as the old one, it could be due to the type of piping being used. The new type of piping might restrict the flow too much.
Maintaining Your System
When a TEV needs replacement, it’s important to handle this job right away. If a worn-out TEV remains in place for too long, it could compromise the boiler and thermostat, necessitating extensive repairs. A repair technician from Reliable Ducts Heating & Cooling can perform yearly inspections to ensure that your TEV is in proper working order.
Under normal conditions, you shouldn’t need to interact with your system’s TEV. It will continue working without your interaction for many years, although regular inspections and maintenance will extend its lifespan considerably. TEV maintenance is straightforward and affordable. At Reliable Ducts Heating & Cooling, we aim to make TEV repairs as fast and efficient as possible.
Our Services
We offer reliable TEV installation and maintenance services to folks throughout Jacksonville, Florida, and the surrounding areas. A properly working TEV is essential for hydronic heating systems in Jacksonville homes, and we’ll go the extra mile to ensure that your TEV is free of damage. Our professionals are friendly and organized, so you can expect us to finish our work quickly and without any hassle.
The Takeaway
A TEV is a convenient and efficient device that helps prevent low water pressure and scalding. It prevents blowback into the system, which can result in extensive damage and costly repairs. The TEV is commonly used with hydronic heating systems and is easy to maintain.
If you have a TEV installed in your system, make sure to have a professional clean the nozzle and check the thermostat on a regular basis. When it’s time to replace the nozzle or thermostat, make sure you get exactly the same model.
At Reliable Ducts Heating & Cooling, we can handle any HVAC repairs, maintenance, or installations you send our way. Our services include air conditioner and heater replacements, air duct cleaning, and home air quality assurance testing. Whether you’re looking for a new heat pump or professional air conditioner repairs, we’ve got you covered.
We have been serving Jacksonville, Florida, and the surrounding areas since 2003. You can count on us for consistent, honest, and transparent services. Our technicians will always arrive on time, your bill will never have hidden costs, and we guarantee superior customer service. We know this region well, and we understand how to keep our customers’ homes comfortable throughout the long, hot summers and brief, cold winters.
If you’d like expert service for your TEV, call us today for more information and to schedule an appointment.
