The operation of the check valve is based on the movement of a small disc. The disc shifts within the housing as the pressure differential changes from forward to reverse. A flat surface on one side of the disc seals off flow, while the other side allows flow to pass. The advantages of the check valve design are low “cracking pressure” and a minimum differential for forward flow, less than 0.005 PSI in the Standard Units. Secondly, there is no residual pressure difference across the check valve once flow has ceased. Flow in the forward direction is relatively unrestricted, 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 the forward direction, which is full flow, is shown in the graphs below right.
FEATURES
- Minimum Cracking Pressure
- Miniature size
- Low Cost
SPECIFICATIONS
Maximum Supply:
F-2804-401: 0.69 bar (10 PSI)
F-2804-402: 0.69 bar (10 PSI)
F-2804-403: 0.69 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
Straight ports for Ø1.6 mm (1/16″) flexible I.D. tubing
MOUNTING
Inline
