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QZF-89 All Weather Fire-retardant Breathing Valve

Product overview

Product model: QZF-89
Valve Diameter: DN50-300mm, NPS2"~12"
Nominal pressure: PN1.0MPa
Explosion-proof grade: BS 5501: IIA, IIB, IIC
Main material: carbon steel WCB, stainless steel 304, 316, aluminum alloy
Positive pressure valve disc material: stainless steel 304, 316, aluminum alloy
Negative pressure valve disc material: stainless steel 304, 316, PTFE
Flange standard: ANSI, API, ASME, can be JIS standard

QZF-89 All Weather Fire-retardant Breathing Valve product details

QZF-89 All Weather Fire-retardant Breathing Valve performance and features

QZF-89 All Weather Fire-retardant Breathing Valve produced and sold by Baigang valve group is installed on the fixed roof tank ventilation device, play a reduction of oil evaporation loss, control of tank pressure and prevent the introduction of the role of the outside flame. The valve has a large amount of ventilation, leakage, corrosion resistance and other characteristics, and electrostatic grounding line so that the valve and the tank to maintain equipotential. The valve has antifreeze properties, suitable for cold areas.

QZF-89 All Weather Fire-retardant Breathing Valve main technical parameters

Positive pressure	353 Pa (36 mmH2O), 980.7 Pa (100 mmH2O)
Negative pressure	294.2 Pa (36 mmH2O)

QZF-89 All Weather Fire-retardant Breathing Valve parts and components of the material

Body material	Carbon Steel WCB, Stainless Steel 304,316, Aluminum Alloy
Positive pressure valve disc material	Stainless steel 304,316, aluminum alloy
Negative pressure valve disc material	Stainless steel 304,316, PTFE PTFE
Ambient temperature ℃	-30 ~ 60

QZF-89 All Weather Fire-retardant Breathing Valve GB flange connection Dimensions: GB, JB

specification	Installation size (mm)
specification	D1	D	L	H	Nd
DN50	Ø110	Ø140	362	360	4 × 14
DN80	Ø170	Ø185	513	445	4 × 18
DN100	Ø170	Ø205	513	445	4 × 16
DN150	Ø225	Ø260	640	610	8 × 18
DN200	Ø280	Ø315	770	700	8 × 18
DN250	Ø335	Ø370	918	828	12 × 18
DN300	Ø395	Ø435	1050	910	12 × 23

QZF-89 All Weather Fire-retardant Breathing Valve API flange connection size: ANSI, API, ASME for JIS standards

specification	Installation size (mm)
specification	D1	D	L	H	Nd
2	120.5	152	362	360	4 × 14
3	152.5	190	513	445	4 × 18
4	190.5	229	513	445	4 × 16
6	241.5	254	640	610	8 × 18
8	298.5	343	770	700	8 × 18
10	362	406	918	828	12 × 18
12	483	432	1050	910	12 × 23

Reminder:

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