Breather valve, Flame arresting breather valve
Description of products
According to national standard《Fire-prevention code of petrochemical enterprise design》( GB50160-92 ) that the vat for containing Cat.A and B liquids must have flame arrestor and breathing valve. It is very clear that breather valve and flame arrestor is an indispensable device for container. It can keep the storage pressure balanced to prevent the container from being damaged during over-pressure or vacuum condition and reduce the loss and volatilization of medium in the container.
Breather valves manufactured by our company feature compact structure, large flow rate, high-quality sealing performance and less leakage. Our company has developed an advanced world-level breather valve with arrester on the inlet of the breather valve, which can prevent any fire source into the valve body and features small compact, lightweight and convenient repair, cleaning and replacement.

Main technical specifications
◆Suitable to special liquid and gas of petroleum, chemical, medicinal energy engineering;
◆ Operating pressure:
A： -295Pa (-30mmH2O) +355Pa (+36mmH2O)
B： -295Pa (-30mmH2O) +980Pa (+100mmH2O)
C： -295Pa (-30mmH2O) +1750Pa (+180mmH2O)
D： -295Pa (-30mmH2O) +98000Pa (+10000mmH2O)
◆Explosion class; BS 5501：IIA、IIB、IIC
◆Shell material: Carbon steel Al. alloy,
◆Material of valve disc and seat: Al.alloy, stainless steel;
◆Sealing material: Tetrafluoroethylene;
◆Flange standards: HG20592-97 PN1.0. If the customer requires GB,HGJ, JB, ANSI,JIS or change pressure grade, clear it in the contract.
◆Manufacturing, test and inspection should be in accordance with standards: SY7511, 《Manufacturing, test and inspection of breather valve used for petroleum container 》, GB5908-1986 《Fire arrestment performance and test methods of arrestor used for petroleum container》.
Product model and specifications

DN	50	80	100	150	200	250
H	280 350	430 500	430 600	530 600	630 700	730 820
H1	110 180	182 250	180 250	220 290	260 330	320 400
L	320	450	450	320	750	850

Figures in the bottom line refer to SLG-IZ size

DN	50	80	100	150	200	250
H	280	430	430	530	630	730
H	350	500	500	600	700	820
L	210	350	350	535	700	850

Figures in the bottom line refer to SLG-IIZ size

DN	50	80	100	150	200	250
H	280	400	400	470	550	620
H	320	470	470	540	625	700
H1	110	160	160	200	250	290
H1	180	270	270	270	320	370
L	320	420	420	520	650	760
L1	185	250	250	320	400	480

Figures in the bottom line refer to SLG-IIIZ size

DN	50	80	100	150	200	250
H	280	430	530	530	630	730
H	350	500	600	600	700	820
H1	110	180	180	200	260	320
H1	180	250	250	290	330	400
L	310	450	450	635	800	950

Figures in the bottom line refer to SLG-IVZ size

DN	50	80	100	150	200	250
H	250	400	400	470	550	625
H	320	470	470	540	620	700
L	290	420	420	535	700	635

Figures in the bottom line refer to SLG-VZ size

DN	50	80	100	150	200	250
H	250	400	400	470	550	620
H	320	470	470	540	625	700
H1	110	160	160	200	250	290
H1	180	230	270	270	320	370
L	300	420	420	520	650	760
L1	185	250	250	320	400	480

Figures in the bottom line refer to SLG-VIZ size

DN	50	80	100	150	200	250
H	270	400	400	470	550	620
H	340	470	470	540	620	700
L	290	420	420	535	700	635

Figures in the bottom line refer to SLG-VIIZ size

DN	50	80	100	150	200	250
H	280	430	430	530	630	730
H	350	500	500	600	700	820
H1	110	180	180	220	260	320
H1	180	250	250	290	330	400
L	310	450	450	635	800	950

Figures in the bottom line refer to SLG-VIIIZ size

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