The Series 800 modulating valve utilizes the most advanced design in pilot operated valves. The non-flowing, modulating pilot can be set at pressures up to 6170 psig [425.52 barg]. Under these process conditions, the pilot and main valve can be tight up to 98 percent of set pressure.

Since the pilot is modulating, the main valve lifts proportionally according to required flow (relief demand), restricting product loss to the mass required to prevent the process pressure from exceeding the code allowance. The pilot provides stable lift even on hard liquid systems due to its unique trim. The 800 Series can also be used in liquids, gases, or mixed phase lading fluids, including dirty and/or wet services.

The Series 800 valve is available with the following: effective orifice areas of 0.110 to 9.489 in² [0.710 to 61.21 cm²], valve inlet sizes 1" to 4" [25 to 100 mm], set pressures between 1481 and 6170 psig [102.13 and 425.52 barg], and continuous temperatures from -65°F to +600°F [-54°C to +315°C].