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Check the check valve spring.
检查逆止阀的弹簧。
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Lift check valve with a spring load can withstand light valve flap, flap valve lift is not high.
升降式止回阀使用一个可承受弹簧载荷的轻量阀瓣，阀瓣的升程不高。
Control supply line water pressure. install a soft seated spring loaded check valve upstream of the assembly.
控制供应管道的水压。在总成的上游安装一个软阀座，弹簧负载止回阀。
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