Spring less non-return valves from STÖHR cut pressure drops Springless non-return valves introduced by STÖHR ARMATUREN create a smaller pressure differential when open compared with conventional spring operated check valves. By using a magnetic field rather than a spring to provide the closing force, the MAGROS valves reduce energy losses, eliminate shutter vibration and offer improved reliability. Traditional spring check valves produce increasing resistance as the shutter opens and the spring becomes more compressed. However, with MAGROS valves the magnetic closing force decreases as the shutter opens further. The minimum cracking pressure is also low at less than 0.1 bar. The valve body of MAGROS is machined from solid stainless steel, with surfaces in contact with the product machined, ground, electrolytically polished or passivated. The valves are suitable for gases and liquids in the temperature range from -40 °C to +50 °C. Cryogenic models are also available, suitable for fluid temperatures between -196 °C for nitrogen (down to -271 °C for helium in special execution) and +50 °C and with a minimum cracking pressure of less than 0.03 bar. Both warm and cold versions of MAGROS will be on exhibition at Valve World 2012 at the stand of STÖHR ARMATUREN (hall 3A, stand 82). Various modifications or special executions are available on request!