Stainless steel breathing valve

According to the national standard "petrochemical enterprise design fire code" (GB50160-92) provisions: "a, B liquid fixed roof tank, should be equipped with flame arrester and breathing valve". Visible breathing valve, flame arrester is an indispensable safety facilities tank. The utility model not only can maintain the pressure balance of the storage tank, ensure the storage tank is protected from overpressure or vacuum, but also can reduce the volatilization and the loss of the medium in the tank. I produced the valve, with a compact structure, large ventilation, small leakage, good sealing performance and other characteristics.

body material	Carbon steel WCB, stainless steel 304, 316, aluminum alloy
Positive pressure valve disc material	Stainless steel 304, 316, aluminum all
Negative pressure valve disc m	Stainless steel 304, 316, PTFE
Ambient temperature	-30~60

Operating pressure	+355Pa-295Pa, +1750Pa-295Pa, +980Pa-295Pa, special pressure, etc.
Texture of material	HT, 20#, Q235, 304, 304L, 316, 316L, etc.
Explosion proof grade	BS 5501:IIA、IIB、IIC
Seal material	Teflon
Flange standard	HG20592-97, SH, GB, JB/T81-94, etc.
Specifications	DN50~DN350

DN	50	80	100	150	200	250	300
H	250	400	400	470	550	620	700
H1	110	160	160	200	250	290	320
L	300	420	420	520	650	760	880
L1	165	250	250	320	400	480	550