2L expansion tank

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An expansion tank is divided into two non-communicating chambers by a flexible elastomeric diaphragm having a peripheral outward projecting, sidewall engaging protrusion that is held in compressed and sealing engagement with the tank walls by a backup ring. The diaphragm-ring assembly facilitates insertion of the diaphragm, provides a positive seal, and prevents the assembly from being forced out of position by extreme pressure differentials.An expansion tank or expansion vessel is a small used in closed systems and domestic hot water systems to absorb excess water pressure, which can be caused by as water is heated, or by . The vessel itself is a small container divided in two by a rubber . One side is connected to the pipe work of the heating system and therefore contains water. The other, the dry side, contains air under pressure, and normally a car-tire type valve stem for checking pressures and adding air. When the heating system is empty or at the low end of the normal range of working pressure the diaphragm will be pushed against the water inlet. As the water pressure increases, so the diaphragm moves compressing the air on its other side. The compressibility of the air cushions the pressure shock, and relieves pressure in the system that could otherwise damage the plumbing system.

When expansion tanks are used in domestic hot water systems, the tank and the diaphragm must conform to regulations and must be capable of accommodating the required volume of water.

2L expansion tank