Caleffi 3/4" Solar Air Valve - Auto Solar Air Venting Valve

CALEFFI 3/4" SOLAR AIR VALVE - AUTO SOLAR AIR VENTING VALVE KIT

Caleffi AutoClose Solar Air Vent Kit - 3/4" NPT

PN - 251003A

Air separators are used to continuously eliminate air from the primary circuits of solar heating systems. The air vent capacity of these devices is extremely high. They are able to automatically remove all the air from the solar circuits, including microbubbles. The circulation of fully separated fluid allows the system to work under optimal conditions without any trouble with noise, corrosion, local overheating and mechanical damage.

This particular series of air separaots has been specifically designed to work at high temperature with a glycol medium, which is typical of solar heating systems.

Made In Italy

Products for solar applications

Caleffi offers an extensive range of automatic air vents and deaerators for solar applications. These products are specially designed and developed further for use at higher pressures and temperatures. Just like the rest of our product range, the solar applications of Caleffi are 100% leak-free. They are a reliable and low-maintenance factor in your installation.

For use with 1/2" piping use of a 3/4" to 1/2" reducer are required. 

Dual effect

In terms of solar applications, too, our products have a dual effect. Caleffi automatic air vents and deaerators improve the efficiency of your installation and save time and money during their installation, commissioning and maintenance.

Continuous deaeration also available for solar systems

Extremely high temperatures can occur in solar systems, which leads to the formation of steam. Valves are installed to prevent vapour release and overheating. Without valves, solar systems can even boil dry.

Caleffi can offer a solar product range with the so-called AutoClose function. These valves only close if it is really necessary.

AutoClose benefits:

• system will not boil dry via the deaerator;
• a permanent air-free, efficient installation;
• solar fluid will not prematurely degenerate;
• no more climbing to the top to deaerate;
• prevents false stagnation;
• suitable for new and existing installations.

TECHNICAL SPECIFICATIONS OF 251 SERIES VALVE MATERIALS:

• Body: brass chrome plated
• Cover: brass chrome plated
• Int. element: stainless steel
• Float: high resistance polymer
• Floating guide: brass
• Stem: antidezincification alloy
• Float lever: stainless steel
• Spring:  stainless steel
• Hydraulic Seals: high resistance elastomer
• Medium: water, glycol solutions
• Max. percentage of glycol: 50%
• Working temperature range: -20 to 320ºF (-30 to 160ºC)
• Max. working pressure: 150 psi (10 bar)
• Max. discharge pressure: 150 psi (10 bar)
• Connections: Main 3/4” F NPT, Drain: 1/2” F NPT