The model BV/BS pressure/vacuum relief valves designed, manufactured and tested according to the API 2000 standard. The model BV/BS pressure/vacuum relief valves are used to relieve excess pressure and vacuum that has developed in a tank. To avoid product loss, BV/BS pressure vacuum relief valves are recommended for use on atmospheric storage tank. The set pressure and vacuum shall be consistent with the requirements of the standard according to which the tank was designed and fabricated. The model BV/BS can be manufactured the range of pressure and vacuum setting form ±22 mm W.C to ±8,000 mm W.C. The model BV type is weight-loaded type with minimum setting ±22 mm W.C and maximum setting ±700 mm W.C. The model BS type is spring-loaded type over weight loaded type.
The materials for BV/BS shall be selected for the stored-product service temperatures and pressures. Also, the materials should be compatible with the product stored in the tank and with any products formed in the vicinity of the relief valve during filling and discharge. Usually the materials are available in Aluminum, Carbon Steel, Stainless Steel grade 304, 316 and 316L to suit individual requirements.