BV-100 & BV-101 series valves are highly developed pressure and vacuum relief valves with excellent flow performance. These valves are useful as relief valves for blanketed vessels in which solvents are filled & drawn at a high flow rate. This valve is installed in the in-and out breathing lines of tanks, vessels and process equipment to protect against unpredicted fluctuations in pressure & vacuum. By retaining toxic vapors and avoiding atmospheric contamination, these valves provide increased fire protection and safety.