A relief valve for relieving pressure in a fluid conduit that includes a cradle positioned in the relief valve conduit and having a ball support surface and a ball mounted on the ball support surface adapted for sealing against the valve seat of the pressure relief port. A spring supported surface and a spring positioned in the pressure relief conduit urges the cradle and the ball into sealing position against the valve seat of the pressure relief port.

A relief valve for relieving pressure in a fluid conduit that includes a cradle positioned in the relief valve conduit and having a ball support surface and a ball mounted on the ball support surface and adapted for sealing against the valve seat of the pressure relief port. A spring support surface and a spring positioned in the pressure relief conduit urges the cradle and the ball into sealing position against the valve seat of the pressure relief port.

A heat accumulator for storing and providing heat energy accruing when power is generated, includes a tank for a fluid, including an expansion line, which exits from the tank and which extends above the tank in order to increase the static pressure in the tank, the expansion line having an open end opposite the tank-side end for establishing a connection between the tank interior and the atmosphere, wherein the expansion line extends into the tank. A method for storing and providing heat energy accruing when power is generated wherein the fluid is used in a district heating grid and is stored in a tank.

An expansion tank includes a tank internally divided into at least two volumes by at least one fixed partition, wherein a first volume is configured to be connected to a hydraulic system and to contain water, thus acting as a storage tank, while the second volume is divided into two parts by a membrane. The first of the two parts, or water section, is configured to be hydraulically connected to the hydraulic system and filled with water from the hydraulic system, while the second of the two parts, or gas section, is configured to be filled with gas at a given pressure, the water section being in hydraulic communication with the first volume.

An adjustable universal tank mount that is mountable to a ceiling, a floor, or a wall. The device is constructed such that it will hold a tank that is 6 to 40 inches in diameter and 9 to 72 inches in height and the support legs can be from 1 inch to 36 inches in length. The tank mount is constructed using 8- to 14 gauge metal. The device is adjustable in height and typically is mounted using fasteners such as bolts or pins. The adjustable universal tank mount allows the user to mount the expansion tank with a single mount making it much more convenient for anyone installing an expansion tank.

An expansion tank control device and a water heater and expansion tank including the expansion tank control device. The device may include a water flow sensor arranged in a water inlet waterway of a water heater to detect water flow in the water inlet waterway. The device can further include a controller outputting a driving electric signal after receiving a first electric signal output by the water flow sensor, and a reset electric signal after receiving a second electric signal output by the water flow sensor. The expansion tank can include an electric driving part arranged on a shell of the expansion tank, and a push plate on a driving end of the part, a controlled end of the electric driving part driving the push plate to move toward the expansion tank after receiving the driving electric signal or away from the expansion tank after receiving the reset electric signal.

A hot water heating system of a dwelling includes a storage tank and a hot water pipe that collects water from a relative upper portion of the storage tank. This water is fed towards a hot water distribution network of the dwelling. The hot water heating system includes in addition a cross-connection pipe that is activated during an emergency mode of the system to direct water from a relative lower portion of the storage tank to be supplied to occupants of the dwelling via the hot water distribution network of the dwelling.