The operation of the check valve is based on the move-ment of a small disc. The disc shifts within the housing as thepressure differential changes from forward to reverse. A flatsurface on one side of the disc seals off flow, while the otherside allows flow to pass. The advantages of the check valve design are low “crackingpressure” and a minimum differential for forward flow, lessthan 0.005 PSI in the Standard Units. Secondly, there is noresidual pressure difference across the check valve once flowhas ceased. Flow in the forward direction is relatively unre-stricted, approximately equivalent to the restriction of a 0.040 inch orifice in the Standard Units. The amount of flow permitted in the reverse direction, which is the sealing side, and theforward direction, which is full flow, is shown in the graphsbelow right.
FEATURES
- Minimum Cracking Pressure
- Miniature size
- Low Cost
SPECIFICATIONS
Maximum Supply: 0.7 bar (10 PSI)
Operating Temperature: 5 to 48 °C (40 to 120 °F)
Recommended Filtration: 5 micron
Cracking Pressure: Less than 0.002 bar (0.8″ H2O)
MATERIALS
Housing:
F-2804-401: Polysulfone
F-2804-402: Polysulfone
F-2804-403: Polysulfone
Disc:
F-2804-401: Celcon
F-2804-402: Celcon
F-2804-403: Silicone
TYPICAL FLOW CHARACTERISTICS
F-2804-401: Less than 2.98 SCIM
F-2804-402: Less than 1.00 SCIM
F-2804-403: Less than 0.20 SCIM
PORT CONNECTIONS
B80: Barb for Ø1.6 mm (1/16″) flexible I.D. tubing
B85: Barb for Ø3.2 mm (1/8″) flexible I.D. tubing
MOUNTING
Inline
