Features

• Capacity: 8 litres
• Crimped or welded carbon steel shells
• Synthetic SBR rubber according to DIN 4807-3 norms suitable for every capacity for maximising tank drawdown.
• Vessels are painted externally with long-lasting epoxy polyester

Advantages

The Cal-Pro expansion vessels absorb the water volume variations in closed heating systems maintaining constant pressure and help to reduce energy consumption. The wide range available meets the requirements of various heating system sizes.

Technical features

Crimped or welded carbon steel shells and synthetic SBR rubber conforming to DIN 4807-3 norms are suitable for every capacity for maximising tank draw down. Vessels are painted externally with long-lasting epoxy polyester powder coating and are l 00% factory tested.

Working

In a closed heating system, water cannot be compressed and any increase in water volume due to the increase in its temperature is absorbed by the expansion vessel. When water is cold, the pre-charge pressure of the tank presses the diaphragm against the tank. As the temperature increases, the expanded water volume pushes against the membrane and water enters the tank, providing additional space to the system. When the temperature decreases, the air cushion forces water back into the system. This permits the system to maintain the pressure, helping to reduce energy consumption of the heating system.