Teleflo Polished Stainless Steel Bv-200 Breather Valve, For Industrial, Certification : Isi Certified

Pressure / vacuum relief valves or breather valves are special types of relief valves which are specifically  designed  for tank protection. The range  includes pressure only, vacuum only and combined pressure / vacuum valves, all available with flanged outlets or vented to atmosphere Pressure / vacuum relief valves are used extensively on bulk storage tan s, including fixed roof tanks with floating covers, to minimize evaporation loss. The valves prevent the buildup of excessive pressure or vacuum which can unbalance the system or damage the storage vessel.
The range inClUdes pressure only, vaCuum only and combined Pressure/Vacuum Valves, all available with flanged outlets or vented to atmosphere. Pressure/Vacuum Relief Valves are used extensively on Dulk storage tanks, including fixed roof tanKs with floating covers, to minimize evaporation loss. Pressure/vacuum relief valves  prevent emission  losses until very close to the set pressure, and prevents air intake until very close to the set vacuum.
The geometry of the valves has been developed in order to optimize overall performance in terms of high flow capacity, set pressure, sealing and re-sealing.