556 Breather Valve

556 Breather Valve

The 556 two-way breather valve is used extensively on military enclosures and provides pressure relief in a variety of scenarios. It protects the enclosure from excess pressure and vacuum during air transport, equalizes pressure due to temperature fluctuations, and relieves back pressure developed when a door is opened and closed.

The 556 can be configured with many pressure settings, with an airtight cover or louvered cover, and for various installation wall thickness. Just let us know your specific needs.

Drawing
3D Model

 

Description

Specifications

Diameter 4.00 in
Housing Aluminum
Housing Finish Hard Anodized
Seals Neoprene
Standard Cracking Pressure 1.0-2.0 inH2O
Operating Temperature Range -65°F to +160°F
Operating Media  Air & Inert Gas
Weight 1.5 lbs

Configurations

New P/N Old P/N Cracking Pressure
(inH2O)
Cracking Vacuum
(inH2O)
Wall
Adapter (in)
Cover (C)
Louver (L)
EMI Shield Type
Shield (S)
Nut (N)
556-1 556-100-L1.0-S0.5-RFL 1.00 0.50 2.06 L S
556-2 556-100-L1.0-S0.75-RFL 1.00 0.75 2.06 L S
556-3 556-100-L1.0-S1.0-RFL 1.00 1.00 2.06 L S
556-4 556-100-L2.0-S2.0-RFL 2.00 2.00 2.06 L S
556-5 556-100-L1.0-S1.7-RFL 1.00 1.70 2.51 L S
556-6 556-100-L1.0-S1.0-RFL 1.00 1.00 1.56 L S
556-7 556-100-L1.0-S1.5-RFL 1.00 1.50 2.06 L S
556-8 556-100-L1.0-S0.1-RFL 1.00 0.10 2.06 L S
556-9 556-100-L1.0-S1.0-RFL 1.00 1.00 1.97 L S
556-10 556-100-L0.1-S0.1-RFL 0.10 0.10 2.06 L S
556-11 556-100-L0.2-S0.2-RFL 0.20 0.20 2.06 L S
556-12 556-100-L1.0-S1.0-RFC 1.00 1.00 2.06 C S
556-13 N/A 1.00 1.00 2.06 L N
556-14 N/A 1.00 1.00 1.56 L N
556-15 N/A 1.00 1.00 2.25 L N
556-16 N/A 0.20 0.20 2.06 L N

Contact Us if Another Configuration is Required

  • Diameter: 4.00 in
  • Housing: Aluminum Alloy
  • Housing Finish: Hard Anodized
  • Seals: Neoprene
  • Standard Cracking Pressure: 1.0-2.0 inH2O
  • Operating Temperature Range: -65°F to +160°F
  • Operating Media: Air & Inert Gas
  • Weight: 1.5 lbs