Profile: 3B Controls Ltd. is a manufacturer of low pressure & vacuum relief valves, breather valves, gauge hatches, emergency vents, gas blanketing valves and flame arresters. Our PV valves are manufactured in carbon steel, stainless steel, hastelloy, aluminium, variety of exotic alloys and plastics such as polypropylene. Steam jacketed valves are also available with us. Our B200 series vacuum relief valves ensure that tanks and vessels are kept safe during periods of excessive vacuum caused by emptying of product and changes in temperature due to climatic changes. Its features include standard vacuum settings, removable seats, standard full form flanges and lightweight design. Its standard seating design ensures minimum leakage of less than 1 scfh at 90% of set pressure. It encloses standard body materials namely aluminium, carbon steel and stainless steel.