QZF-89 Type all-weather fire breathing valveDetailed product description：

The QZF-89 all-weather fire breathing valve is a ventilation device installed on a fixed top tank, which reduces oil evaporation loss, controls tank pressure, and prevents external flames from entering. The QZF breathing valve has the characteristics of high ventilation, low leakage, corrosion resistance, and has an electrostatic grounding wire to maintain an equipotential between the valve and the tank body. The QZF-89 breathing valve has anti freezing performance and is suitable for cold regions.

QZF-89 all-weather fireproof breathing valve external dimensions:

Specification	Drawing number	Installation size (millimeters)
		H	L	D	D1	D2	n	d
DN20	RQZF-50	three hundred and sixty	three hundred and sixty-two	Φ140	Φ110	Φ90	four	fourteen
DN80	RQZF-80	four hundred and forty-five	five hundred and thirteen	Φ185	Φ150	Φ125	four	eighteen
DN100	RQZF-100	four hundred and forty-five	five hundred and thirteen	Φ205	Φ170	Φ145	four	eighteen
DN150	RQZF-150	six hundred and ten	six hundred and forty	Φ260	Φ225	Φ200	eight	eighteen
DN200	RQZF-200	seven hundred	seven hundred and seventy	Φ315	Φ280	Φ255	eight	eighteen
DN250	RQZF-250	eight hundred and twenty-eight	nine hundred and eighteen	Φ370	Φ335	Φ310	twelve	eighteen

Main performance specifications

Positive pressure

0.3～1.6MPa

Product Use
The QZF-89 all-weather fire breathing valve is a ventilation device installed on a fixed top tank, which reduces oil evaporation loss, controls tank pressure, and prevents external flames from entering.