Normal-pressure self-closing valve

Abstract

The invention discloses a normal-pressure self-closing valve and belongs to the field of water supply valves. The normal-pressure self-closing valve comprises a straight-through single-seat valve body and a valve cover, and a valve seat and a valve element which are arranged in the straight-through single-seat valve body form a sealing pair. A valve rod is arranged on the valve element in the straight-through single-seat valve body, an unthreaded hole perpendicular to the valve seat in the straight-through single-seat valve body is arranged on the valve cover, the upper end of the valve rod penetrates through the unthreaded hole, a second valve element is arranged at the upper end of the valve rod, a free sliding gap is reserved between the unthreaded hole and the valve rod, a second valve seat is arranged on the lower surface of the valve cover and matches with the valve element in the straight-through single-seat valve body to form a second sealing pair, a third valve seat is arranged on the upper surface of the valve cover and matches with the second valve element outside the straight-through single-seat valve body to form a third sealing pair, and the first sealing pair in the straight-through single-seat valve body and the third sealing pair outside the same seal synchronously. The normal-pressure self-closing valve is used for preventing water from escaping.

Description

technical field [0001] The invention belongs to the field of water supply valves, in particular to a normal pressure self-closing valve. Background technique [0002] With the continuous improvement of the water supply system, although the phenomenon of tap water cut-off has rarely occurred, it is still unavoidable for maintenance and other reasons. When the water is cut off, people tend to forget to turn off the faucet after opening it, or deliberately do not turn off the faucet. , When there is a sound of running water when the water comes, you will know that the water is coming, but it is easy to ignore that the faucet is not turned off when you go out or sleep, so when the water comes, it is very easy to cause the phenomenon of water running, so the water running caused by this reason The phenomenon is not uncommon. It not only wastes water resources, but also causes damage to the houses and furniture of the neighbors downstairs. The economic loss is relatively large, an...

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Problems solved by technology

[0002] With the continuous improvement of the water supply system, although the phenomenon of tap water cut-off has rarely occurred, it is still unavoidable for maintenance and other reasons. When the water is cut off, people tend to forget to turn off the faucet after opening it, or deliberately do not turn off the faucet. , When there is a sound of running water when the water comes, you will know that the water is coming, but it is easy to ignore that the faucet is not turned off when you go out or sleep, so when the water comes, it is very easy to cause the phenomenon of water running, so the water running caused by this reason The phenomenon is not uncommon. It not only wastes water resources, but also causes damage to the houses and furniture of the neighbors downstairs. The economic loss is relatively large, and it may also affect the harmony of the neighbors.

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