The OCV 1340 is a two-way, normally open pilot, that senses pressure under its diaphragm and balances it against an adjustable spring load. An increase in pressure above the spring set point tends to make the pilot close. The 1340 is the standard pilot for the OCV Series 127 Pressure Reducing Valves. It senses downstream pressure and modulates the main valve to maintain that pressure. There are additional applications for the 1340 as a normally open, pressure to close control.