check valve 是什么意思

	1.	The second check valve has a lighter weight spring 第二止回阀则配置较轻的弹簧。
	2.	Marine forged steel male thread stop and check valves 船用外螺纹锻钢截止止回阀
	3.	Marine flanged cast steel over board stop check valve 船用法兰铸钢舷侧截止止回阀
	4.	J kind of flanged cast iron 0 . 5mpa stop check valves J类法兰铸铁0 . 5mpa截止止回阀
	5.	J kind of flanged cast iron 1 . 0mpa stop check valves J类法兰铸铁1 . 0mpa截止止回阀
	6.	J kind of flanged cast steel 1 . 0mpa stop check valves J类法兰铸钢1 . 0mpa截止止回阀
	7.	J kind of flanged cast steel 2 . 0mpa stop check valves J类法兰铸钢2 . 0mpa截止止回阀
	8.	J kind of flanged bronze 1 . 6mpa stop check valves J类法兰青铜1 . 6mpa截止止回阀
	9.	Check valve guiding shall be plastic to plastic 止回阀引导装置应该是塑料对塑料。
	10.	J kind of flanged bronze 0 . 5mpa stop check valves J类法兰青铜0 . 5mpa截止止回阀

check valve是什么意思