Masoneilan 78-40 Air Filter Regulators and SVI Series Valve Positionor for Thermal Power Plants

The Masoneilan 78-40 is a high-performance air filter regulator (also known as an air set) . It provides clean, stable, and regulated compressed air to pneumatic instruments in industrial process control systems.

The Masoneilan 78-40 Air Filter Regulator is a compact, lightweight, and reliable pressure-reducing device with integrated filtering and relief functions. It delivers precise pressure regulation while removing contaminants from the air supply, ensuring consistent and dependable operation of downstream equipment. Built with corrosion-resistant materials and robust construction, it is ideal for demanding industrial environments where clean instrument air is essential.

This model features an output pressure range of 5-100 psi (0.35-7 bar), making it suitable for a wide variety of pneumatic control applications. It combines high flow capacity, low air consumption, and excellent stability in a compact design.

• Compact and lightweight design for easy installation and space-saving mounting
• Integrated 5-micron sintered porous polyethylene filter to remove particulates from the air supply
• Built-in relief valve for overpressure protection
• Corrosion-resistant finish with stainless steel hardware for use in harsh or corrosive environments
• Manual pressure adjustment via a top-mounted knob for precise setpoint control
• Low air consumption for energy efficiency
• Includes gauge port (1/8" NPT) for easy monitoring
• Mounting bracket option available
• High-performance pressure regulation with minimal droop and fast response

• The Masoneilan 78-40 is widely used to supply clean and regulated instrument air in process industries, including:
• Supplying stable air to control valve positioners and pneumatic actuators
• Providing filtered air to I/P (current-to-pneumatic) transducers and other pneumatic instruments
• General process plant air regulation in oil & gas, petrochemical, refining, power generation, and chemical processing facilities
• Harsh or corrosive environments where reliable air quality is critical for instrument performance

• Masoneilan 78-4 Air Filter Regulator (5-40 psi range)
• Masoneilan other instrumentation accessories (e.g., 77-6 Air Lock-up Valve)
• Masoneilan control valve positioners and I/P transducers
• Masoneilan full range of pneumatic and control valve solutions

We are happy to assist with any customization, spares, or application-specific requirements!