Imports, also known as one-way valve or checkvalvecheckvalve is automatically prevent fluid backflow valve.
进口止回阀又称单向阀或逆止阀,是能自动阻止流体倒流的阀门。
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This includes removing any mineral deposits around the seat beneath the valve. Also check that the pull chain attached to the valve is not too short and holding the valve slightly open.