GFQ-1 type all-weather fire-resistant breathing valveDetailed product description：

The GFQ-1 all-weather fire-resistant breathing valve is used as the main safety equipment 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. The all-weather flame retardant breathing valve is usually used in conjunction with a flame arrester.

The main features of GFQ-1 all-weather fire-resistant breathing valve include high ventilation, good sealing performance, low leakage, and corrosion resistance.

Main technical parameters of GFQ-1 all-weather fire-resistant breathing valve
Operating pressure:
A-grade positive pressure: 355Pa (36mm water column), 295Pa (30mm water column)
B-level positive pressure: 980Pa (100mm water column), 295Pa (30mm water column)
C-level positive pressure: 1765Pa (30mm water column), 295Pa (30mm water column)

Please indicate the product name, model, specifications, and pressure rating when placing an order.

The main appearance and flange connection dimensions of GFQ-1 all-weather fire-resistant breathing valve

Specification	Weight (Kg unit)	Installation size of all-weather fire-resistant breathing valve (mm)
		D1	D1	L	H	n×Φ
DN50	six point five	Φ110	Φ140	one hundred and sixty	two hundred and fifty-five	4×14
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

Note: The connecting flange complies with the provisions of JB78-59 "Cast Iron Flanges"