HLSW／KHLSW air operated / electrically operated bellows-operated pilot sealed small caliber single-seat control valve HLSW／KHLSW air operated / electrically operated bellows-operated pilot sealed small caliber single-seat control valve mostly used in the situation of extremely poison, flammability and highly explosive, uncommon valuable medium and vacuum.

> HTSJ／KHTSJ air operated / electrically operated bellows-operated pilot sealed single-seat control valve HTSJ／KHTSJ air operated / electrically operated bellows-operated pilot sealed single-seat control valve mostly used in the situation of extremely poison, flammability and highly explosive, uncommon valuable medium and vacuum.

HCBW／KHCBW air operated / electrically operated bellows-operated pilot sealed balance cage shaped control valve HCBW／KHCBW air operated / electrically operated bellows-operated pilot sealed balance cage shaped control valve mostly used in the situation of extremely poison, flammability and highly explosive, uncommon valuable medium and vacuum.