Legris
Legris 4203 15 22 20 Axial Valve 1/2" FNPT
Nickel-plated brass axial valve with 1/2" FNPT connections, normally closed operation, 150 psi maximum pressure and FKM seals for -4 to 275 °F service
- Nickel-plated brass body resists corrosion for long service life
- Normally closed design ensures fail-safe shut-off when pilot pressure is lost
- FKM seals handle temperatures from -4 °F to 275 °F across demanding applications
- 1/2" FNPT connections provide direct pipe-thread fit without extra adapters
- 150 psi maximum operating pressure suits high-demand compressed-air systems
Legris 4203 Axial Valve
The Legris 4203 is a normally closed axial valve designed for compressed air and vacuum systems. Its nickel-plated brass body and FKM seals suit industrial environments where chemical resistance and durability matter. The 1/2 inch FNPT ports integrate directly into standard piping without adapters. Maintenance teams and OEMs specify it for reliable on-off control in automated lines.
Pilot Pressure Operating Window
The valve requires a minimum pilot pressure of 60 psi to shift and tolerates up to 115 psi at the pilot port. System pressure must not exceed 150 psi, defining a clear operating envelope for safe actuation. The 1/8 inch FNPT pilot port accepts standard fittings for remote or manifold-mounted pilot supply. Designers must ensure the control circuit stays within these limits to avoid failure to shift or seal damage.
Build Quality and Mounting Implications
A 27 mm hex on the body allows secure installation with standard wrenches without damaging the nickel-plated finish. Overall length of 4.13 inches and height of 2.33 inches fit tight machine envelopes while leaving room for pilot line routing. The FKM seal material withstands temperatures from -4 to 275 degrees F, covering most shop-floor and process conditions. Threaded FNPT connections on both ports eliminate the need for separate unions during maintenance.
Highlights
- Nickel-plated brass body resists corrosion for long service life
- Normally closed design ensures fail-safe shut-off when pilot pressure is lost
- FKM seals handle temperatures from -4 °F to 275 °F across demanding applications
- 1/2" FNPT connections provide direct pipe-thread fit without extra adapters
- 150 psi maximum operating pressure suits high-demand compressed-air systems
Specifications
| Brand | LEGRIS |
|---|
Questions about this item
Should I choose the 1/2" FNPT version or look for a different port size?
This valve has 1/2" FNPT connections on both ends, so select it when your piping uses 1/2" female NPT threads.
What does the 150 psi rating mean once the valve is installed in my system?
The valve will hold up to 150 psi operating pressure; the pilot circuit needs at least 60 psi and no more than 115 psi to actuate reliably.
How does the FNPT connection standard limit what I can thread into this valve?
FNPT threads mate only with male NPT fittings; you cannot use BSP, metric or compression ends without an adapter.
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