78 Series Air Filter Regulator and Air Lock Up Valves

The Model 78-40 air filter regulators are compact, lightweight, high performance pressure reducing valves. They are used primarily for
supplying a stable source of air to process control equipment, such as control valve positioners and current to pneumatic transducers. These regulators are externally adjustable for fine tuning and include a locking feature for maintaining output pressure at the desired level. The compact design is easy to mount onto a range of equipment using various methods and orientations.

The Model 78-80 transfer valve is used to switch the air flow from one port to another, when the signal pressure becomes lower than the
set pressure in case of the air failure. The 3-way transfer valve can be also used as the lockup valve by plugging off the exhaust port. The lockup valve is used to lock the control valve in its last position (Air-Failure-Lock) by confining the air pressure in the actuator, when the signal pressure becomes lower than the set pressure in case of the air failure. When the failed air pressure is recovered above the set pressure, the locked position is released and the control valve will go back to the normal operation.

Air Filter Regulator Model 78-40:
• Inlet pressure rating: 210 psi
• Pressure set range : 5-100 psi
• Filter: Polyethylene (5μm)
• Temperature range: -40ºC to 83ºC, option for -50ºC to 60ºC or 0 to 100ºC

Transfer/Lock Up Valves Model 78-80:
• Transfer valve pressure: 250 psi
• Max signal pressure: 150 psi
• Temperature range: -30ºC to 83ºC

Version 78-80S:
• Cv In to Out: 0.8
• Cv Out to Ex: 1.3

Version 78-80H:
• Cv In to Out: 4.5
• Cv Out to Ex: 5.0