Gfq-2 Stainless Steel Breathing Valve

• Media: Water
• Standard: Water Vapour Oil
• Certification: CCC, RoHS, ISO, CE
• Temperature: High Temperature
• Connection: Flange
• Valve Seat: Double-Seat
• Model NO.: GFQ-2
• Structure: Piston
• Material: Cast Iron
• Transport Package: Wooden Box
• Specification: DN15-DN800
• Trademark: XC
• Origin: China
• HS Code: 8421219990
• Production Capacity: 9999

Product Description

Product Name:	Stainless steel Breather valve	Product model:	GFQ-2
Nominal diameter:	DN25 to DN400	Function Function:	Exhale and inhale
Nominal pressure:	1.6 MPa	Connection method:	Flange
Applicable temperature:	-28ºC to +60ºC	Installation position:	Top of storage tank
Body material:	Cast iron, cast steel, stainless steel, aluminum alloy	Manufacturing standard:	GB, German DIN, American API, ANSI
Applicable media:	Gasoline, diesel, kerosene, crude oil, toluene, etc	Manufacturer:	Xuan Cheng Valve Co., LTD

Product Description

GFQ-2 stainless steel breathing valve is used for oil and liquid tank, used to exclude the positive pressure and negative pressure gas in the tank, so that the liquid in and out of the tank is convenient, such as the tank is not equipped with breathing valve the liquid in and out of the tank has certain obstacles, it is likely to appear tank deformation and vibration, GFQ-2 stainless steel breathing valve design is reasonable, simple structure, easy to use, is an essential product of the storage tank.

Product Features

1, stainless steel breathing valve shell selection of stainless steel, cast steel and aluminum alloy, good corrosion resistance;
2, the valve disc is made of tetrafluoroidal material, low temperature resistance, good anti-freeze performance;
3. Simple structure, easy maintenance, safe and convenient.
4, the performance is fully in line with the Ministry of petroleum industry standard SY7511-87.

Working principle

The QFQ-2 stainless steel breathing valve is composed of pressure valve and vacuum valve, which is installed on the cargo oil tank ventilation pipe. It can automatically open and close with the positive and negative pressure changes in the cargo oil tank, so that the pressure difference between the inside and outside of the cargo oil tank is kept within the allowable value. When the pressure of the medium in the tank is within the control operating pressure range of the breathing valve, the breathing valve does not work to maintain the tightness of the oil tank; When the medium is added to the tank, the pressure of the upper gas space in the tank rises, and when the operating pressure of the breathing valve is positive, the pressure valve is topped open, and the gas escapes from the breathing valve outlet, so that the pressure in the tank does not continue to increase; The atmosphere outside the tank will top open the negative pressure valve disc of the breathing valve.

Product action

GFQ-2 stainless steel breathing valve is installed on the top of the storage tank, is to solve the positive pressure in the tank, negative pressure of the gas, so that the liquid in the tank is not hindered, when the external liquid is input into the tank there is a large number of gas to call out (called positive pressure). If the liquid in the tank is exported, the tank must be sucked into the tank from the outside air (called negative pressure). If the breathing valve is automatically closed when it stops working, it will not leak the liquid gas in the tank outwards, so that the liquid quality in the tank has been favorable protection.

Scope of application

Stainless steel breathing valve is suitable for storing Class A oil with flash point below 28 ° C and Class B oil with flash point below 60 ° C, such as gasoline, benzine, methyl benzine, kerosene, light diesel, oil, crude oil and other oil products and chemical product storage tanks with the same nature. Stainless steel breather valve can be used with ZGB ripple flame arrester.

Operating pressure

Pressure	Grade
	A	B	C	D
Exhalation pressure	+355Pa(36mmH20)	+980Pa(100mmH20)	+1765Pa(180mmH20)	Special designation
Suction pressure	-295Pa(30mmH20)	-295Pa(30mmH20)	-392Pa(40mmH20)	Special designation

Ventilation scale

Code Names	Specifications mm	50	80	100	150	200	250
	Stress rating Pa	Ventilation m3/h
A	+ 335	25	60	90	190	340	550
	- 295.	20	50	75	160	280	450
B	+ 980	30	70	100	200	380	600
	- 295.	20	50	75	160	280	450
C	+ 1765	40	95	140	280	500	800
	- 295.	20	50	75	160	280	450
Standard allowable leakage m3/h		0.04 or less				0.4 or less

Material code

Code name	Materials
	ZALSi7Mg	Cast aluminum alloy	Aluminum alloy	1Cr13	304	Te-flon	Oils
	CS	Carbon steel	304	304	304	Te-flon	Oil products, chemicals
	OCr18Ni9	SS304	304	304	304	Tef-lon	Chemicals
	00Cr19Ni11	SS304L	304L	304L	304L	Te-flon	chemicals
	0Cr17Ni12Mo2	SS316	316	316	316	Te-flon	Chemicals
	00Cr17Ni14Mo2	SS316L	316L	316L	316L	Te-flon	chemicals

Major parts

Body material	WCB, 304, 316, aluminum alloy
Positive pressure valve disc material	304, 316, aluminum alloy
Negative pressure valve disc material	304, 316, tetrafluoroPTFE
Ambient temperature ° C	- 30 ~ 60

 

Main overall dimensions

Nominal diameter (mm)	Mounting dimensions (mm)
	D	K	L	H	N x phi
DN25	115	85	160	165	4 x 14
DN32	135	100	180	185	4 x 18
DN40	145	110	190	190	4 x 18
DN50	160	125	220	220	4 x 18
DN80	195	160	270	260	8 x 18
DN100	215	180	310	280	8 x 18
DN150	280	240	380	330	8 x 22
DN200	335	295	450	380	12 x 22
DN250	395	350	520	420	12 x 22
DN300	565	515	670	520	16 x 26

Instructions for use

The breathing valve is installed on the top of the storage tank, which is to solve the positive pressure and negative pressure of the gas in the tank, so that the liquid in the tank is not hindered, and when the external liquid is input into the tank, there is a large amount of gas to call out (called positive pressure). If the liquid in the tank is exported, the tank must be sucked into the tank from the outside air (called negative pressure). If the breathing valve is automatically closed when it stops working, it will not leak the liquid gas in the tank outwards, so that the liquid quality in the tank has been favorable protection.

Maintenance

In order to use the breathing valve safely, check that the guide rod and valve disc are flexible before use. The valve should be regularly (within 6 months) check whether the positive and negative valve disc of the vent is flexible, and whether the contact surface of the valve disc is damaged. If there is damage, it should be repaired immediately. After the overhaul is completed, everything can be used again if normal.