For closed heating systems (according to EN12828) and cooling systems.

When the temperature in the system rises, the water expands. The expansion water is temporarily stored in the expansion vessel to keep the pressure in the system constant. The best expansion vessels thanks to innovative technology. Every expansion vessel is checked for leaks and pre-pressure before it leaves the production line. The membranes are suitable for antifreeze. Membranes and steel vessels of the highest quality. The water connection thread remains coated, resulting in a better screw connection. Gas side filled with nitrogen to protect against corrosion and pressure loss.

Maximum operating overpressure: 3/6 bar.

Vessels conform to EN13831.

Suitable for systems with a maximum system temperature of 120 ° C..

Min. / max. operating temperature (at the membrane): -10 / 70 °C.

(at higher temperatures we recommend taking suitable measures to reduce the temperature).

Diaphragm: Inverted diaphragm made of SBR rubber.

Suitable for the addition of up to 50% glycol-based antifreeze.

High-quality steel vessels with galvanised clamping ring.

Approval according to EU Pressure Equipment Directive 2014/18/EU.

White (RAL 9010) epoxy powder coating.

Contra-Flex W 35 - W 80: With welded feet for fixing.

Classification Attribute

Ultimate pressure [bar]: 3

For domestic water: No

Capacity [l]: 25

Pre-pressure [bar]: 1.5

With fixed wall support: No

Vertical placement: Yes

Maximum mean temperature (continuous) [°C]: 70

Horizontal placement: No

With feet: No

With replaceable membrane: No

Nominal inner diameter expansion connection: 3/4 inch (20)

Outer pipe diameter expansion connection [mm]: 26.5

Connection external thread gas conical (BSPT)

Colour: white

Diameter [mm]: 328

Height [mm]: 356.