3-Line Presco-Pilot® 
The 3-Line Presco-Pilot is a pressure-responsive, three-way poppet valve that is typically used to monitor pipeline pressure upstream or downstream of an emergency shutdown device (ESD) and to control the ESD valve. The 3-Line Presco-Pilot is available for a wide variety of pressure ratings, service conditions and hydraulic or pneumatic configurations.
Pressure Sensing Base Features –
- Pressure sensing bases use diaphragms, plungers or bellows.
- Interchangeable springs enable each basic unit to be used for a variety of pressure ranges.
- Accurate operation and repeatability are provided by the smooth plunger movement and precision manufacturing.
- Long life is ensured by a guided plunger, resulting in a useful life that exceeds other types of pressure switch mechanisms.
- High proof pressure is provided by a positive plunger stop so that the Presco-Pilot will withstand overpressure and surges.
- Rugged design enables the Presco-Pilot to withstand severe operating conditions including shock and corrosion.
