QFHQ-2 all-weather fire breathing valveDetailed product description：

Performance Specification for QFHQ-2 All Weather Fire Breathing Valve:

Positive pressure	353Pa(36mmH2O)， 980Pa(100mmH20)
negative pressure	295Pa(30mmH2O)

Product Usage

This 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.

Structural features:

The QFHQ-2 all-weather fire breathing valve has the characteristics of high ventilation, low leakage, corrosion resistance, etc. It also has an electrostatic grounding wire to maintain equipotential with the tank body. This valve has anti freezing performance and is suitable for cold regions.

Overall dimensions:

Specification	Drawing number	weight (Kg unit)	Installation size (millimeters)
			H	L	D	D1	D2	n	d
DN20	RQZF-50	twenty-five	three hundred and sixty	three hundred and sixty-two	Ø140	Ø110	Ø90	four	fourteen
DN80	RQZF-80	forty	four hundred and forty-five	five hundred and thirteen	Ø185	Ø150	Ø125	four	eighteen
DN100	RQZF-100	forty-seven	four hundred and forty-five	five hundred and thirteen	Ø205	Ø170	Ø145	four	eighteen
DN150	RQZF-150	seventy-one	six hundred and ten	six hundred and forty	Ø260	Ø225	Ø200	eight	eighteen
DN200	RQZF-200	ninety-eight	seven hundred	seven hundred and seventy	Ø315	Ø280	Ø255	eight	eighteen
DN250	RQZF-250	one hundred and thirty	eight hundred and twenty-eight	nine hundred and eighteen	Ø370	Ø335	Ø310	twelve	eighteen