Check valve and hot water circulation system including same

Abstract

The invention discloses a one-way valve and a hot water circulation system comprising it. The one-way valve includes a housing, a valve core and an elastic element, the elastic element is used to bias the valve core so that the valve core engages the valve seat of the housing to close the one-way valve; the one-way valve also includes a limiting part, The limiting part is configured to be switchable between a first position and a second position according to the hydraulic pressure at the fluid outlet side of the one-way valve; in the first position, the spool is not interfered; in the second position, the movement of the spool is restricted. The one-way valve can avoid false opening. The hot water circulation system has the one-way valve, the water outlet of which is connected to the cold water supply port of the water end. The cold water outlet at the water end flows out, which solves the defect that the one-way valve is mistakenly opened due to hydraulic pressure changes when using cold water, causing hot water to flow out and causing the water heater to start, which is more energy-saving.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to a check valve and a hot water circulation system comprising it. Background technique [0002] In the prior art, the water heater often has a hot water circulation function to realize instant heating. The hot water circulation function mainly uses the circulation pump to pump the cold water in the water pipeline back to the water heater for heating, and then transports it into the water pipeline for heating. Circulation, through continuous circulation heating, there is always hot water in the water pipeline, so that hot water can be supplied without heating time when the user boils the water. However, since most users are renovating old houses and want to use a water heater with a circulation function, they can only use a one-way valve to pass the cold water pipe as a circulation circuit. The one-way valve leads the hot water to the cold water circuit in one direction to for circulat...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a one-way valve and a hot water circulation system containing it in order to overcome the defects in the prior art that hot water flows out when cold water is used and causes the water heater to start

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