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。
It can guarantee the coasting body not over-sink or over-float with the support of light-load spring under light load and heavy-load spring under heavy load.
轻载时由轻载弹簧支承，重载时重载弹簧加入承重，保证惯性体不会超限下沉或上浮；
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