In this design, weights were applied directly to the top of the valve mechanism. Another disadvantage was premature opening of the valve if the device was subjected to bouncing movement.ĭirect-acting deadweight pressure relief valves: Later to avoid the disadvantages of the lever arrangement, direct-acting deadweight pressure relief valves were installed on early steam locomotives. This simple system worked however more space was needed and it coud be easily tampered with leading to a possible overpressure and explosion. Designs requiring a higher relief pressure setting required a longer lever arm and/or larger weights. When the force of the steam pressure acting on the valve exceeded the force of the weight acting through the lever arm the valve opened. His pressure relief design consisted of a weight suspended on a lever arm. The development of the safety relief valve has an interesting history.ĭenis Papin is credited by many sources as the originator of the first pressure relief valve (circa 1679) to prevent overpressure of his steam powered “digester”. Pressure relief valves (safety relief valves) are designed to open at a preset pressure and discharge fluid until pressure drops to acceptable levels.
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