The Masoneilan 78-40 is a compact, high-performance air filter regulator, often branded as a 78 series or 78-4, designed for pressure reduction in pneumatic instrumentation, including control valve positioners. It features a 5–40 psi set range, 210 psi max inlet pressure, and a 1/4" NPT connection, with a self-relieving feature that allows for consistent pressure adjustment.
Key Features and Specifications of the Masoneilan 78-40:
- Model/Range: 78-4 or 78-40 (5–40 psi).
- Inlet Pressure Rating: 210 psi (1.5 MPa, 15 bar) maximum.
- Connections: 1/4 NPT.
- Flow Capacity: Rated \(C_{v}\) 0.25.
- Filter Element: Sintered Porous Polyethylene (5μ or 2 micron).
- Material: Aluminum die-cast body/casing with a VALOX 420 knob.
- Operation: Self-relieving, allowing downward adjustment of output pres
P/N 20450036299H