The “RV”, with its unique poppet type seal, senses the pressure being applied and opens at a pre-adjusted point to provide a pilot signal for circuit control. Because the output force of a cylinder is a direct function of pressure times area, the “RV” provides direct and precision adjustable force sensing.• Simple - One moving part • Corrosion resistant construction • Black anodized aluminium body • Light weight • Compact • Repairable • Buna-N seals • Simple adjustment• Operating temperature 0° to + 180°F • Operating pressure: 20 to 150 psi • Standard Spring: 50 to 150 psi • Light Spring: 20 to 55 psi. Light spring and instructions included with each unit.