H77X對夾蝶型止回閥、對夾止回閥是用于防止管道和設備使用中介質倒流的一種閥門；其閥板采用對偶板上加兩個扭力彈簧的設計，可使閥板在壓力范圍內自行開閉。可根據用戶的需要，而選用不同的膠種及其它各部件。閥體結構長度為短系列，剛性好，安裝方便；使用性能可靠，抗干擾性好。

Wafer swing check valve is used to prevent media from flowing backwards in pipeline and device ;Its design two torque springs on the double disks which are closed by torque springs in the scope of pressure .Different rubber and other parts will be used according to requirement of customer .Face to face dimension for body is short series .It is of good stiffness and convenient installation .