Respirator

1.HXF-88 type respiratory valve for the main safety equipment installation of crude oil, gasoline, kerosene, diesel, aromatics and other fixed type storage tank on top of, is to reduce the evaporation loss of oil tank and protection under overpressure or vacuum from damage. This valve is usually used with a flame arrester.
2 the valve has a large amount of ventilation, good sealing performance, small leakage, corrosion resistance of the prominent features.
3 operating pressure: a positive pressure: 1765Pa (180 mm water column); negative pressure: 294Pa (30 mm water column) B positive pressure: 980Pa (100 mm water column); negative pressure: 294Pa No Information

Model	positive pressure	negative pressure
HXF-88AⅠ HXF-88BⅠ	353pa 36mmH2O	294pa 30mmH2O
HXF-88AⅡ HXF-88BⅡ	980pa 100mmH2O	294pa 30mmH2O
HXF-88AⅢ HXF-88BⅢ	1765pa 180mmH2O	294pa 30mmH2O

Specifications	size（mm)
	D	D1	D2	n	d
DN50	φ140	φ110	φ90	4	14
DN100	φ205	φ170	φ145	4	18
DN150	φ260	φ225	φ200	8	18
DN200	φ315	φ280	φ255	8	18
DN250	φ370	φ335	φ310	12	18