Expansion vessel VAREM LR CE 35 L, 3/4" connection, for gas systems up to 6 bar

The VAREM LR CE 35 L expansion vessel with a 3/4" connection is a diaphragm-type accumulator designed for gas systems operating up to 6 bar. With a net capacity of 35 liters, this pressure vessel provides hydraulic compensation to absorb pressure variations, reducing stress on pipes, valves and other system components. It is intended for domestic and light commercial gas installations, boiler circuits and heating systems that require a compact 35 L expansion vessel to stabilize system pressure and improve operational reliability.

Advantages

This expansion vessel uses a pre-charged diaphragm to separate the gas and fluid sections, ensuring rapid response to pressure changes and minimizing fluid loss. The 3/4" threaded connection simplifies installation on standard gas and heating fittings. Constructed to meet CE requirements for LR series vessels, it is suitable for use in systems with working pressures up to 6 bar and offers a compact footprint that fits into tight mechanical spaces.

Suitable for

• Domestic gas installations and residential boiler systems
• Light commercial heating systems and small commercial boiler circuits
• Systems requiring hydraulic compensation and protection against pressure surges
• Installations where a 35 L diaphragm expansion vessel is specified

Key specifications

• Type: diaphragm (membrane) expansion vessel
• Net capacity: 35 liters
• Connection size: 3/4" threaded inlet
• Maximum working pressure: up to 6 bar
• Application: gas and heating system hydraulic compensation
• Compliance: designed to meet CE requirements for LR series vessels

How to use

Install the expansion vessel vertically or horizontally according to available space and installer recommendations, ensuring the 3/4" connection is compatible with the system piping. Before commissioning, check and adjust the pre-charge pressure of the gas side to match the system static pressure, following the manufacturer's guidance for initial pressure settings. Secure the vessel to prevent movement, connect to the system at an appropriate location such as near the boiler or pump station, and test the system for leaks and correct pressure compensation during initial operation.

Usage recommendations

Regularly inspect the vessel and fittings for signs of corrosion, leaks or diaphragm failure. Verify the pre-charge pressure periodically, particularly after maintenance or system draining, and replace the vessel if the diaphragm shows loss of elasticity or if the unit fails to maintain system pressure within expected ranges.