GFQ-2 type all-weather breathing valveDetailed product description：

The GFQ-2 all-weather breathing valve is the main safety equipment used for installing fixed top storage tanks for crude oil, gasoline, kerosene, light diesel, aromatic hydrocarbons, etc. It plays a role in evaporation loss and protecting the storage tank from damage under overpressure or vacuum. This breathing valve is usually used in conjunction with flame arresters.

Main external dimensions of GFQ-2 all-weather breathing valve:

Specification	weight (Kg unit)	Installation size (millimeters)
		D1	D	L	H	n×Φ
DN50	six point five	Φ110	Φ140	one hundred and sixty	two hundred and fifty-five	4×18
DN80	nine point eight	Φ150	Φ185	two hundred and thirteen	two hundred and sixty	4×18
DN100	twelve	Φ170	Φ205	two hundred and sixty-five	two hundred and ninety	4×18
DN150	twenty-one	Φ225	Φ260	three hundred and five	three hundred and thirty	8×18
DN200	thirty-one	Φ280	Φ315	three hundred and fifty-five	three hundred and fifty	8×18
DN250	thirty-five	Φ335	Φ370	four hundred and twenty	four hundred	12×18

Product Structure Features
This valve has the characteristics of high ventilation, good sealing performance, low leakage, and corrosion resistance.

Main performance specifications for all-weather breathing valves:

A-grade positive pressure	355Pa (36mm water column)
negative pressure	295Pa (30mm water column)
B-level positive pressure	980Pa (100mm water column)
negative pressure	295Pa (30mm water column)
C-level positive pressure	1765Pa (180mm water column)
negative pressure	295Pa (30mm water column)