80% to 90% less than conventional full-body swing check valves
Simplifies piping
Reduces termal and seismic considerations
Optimizes space utilization
Lowers installation costs
Reduces pipe supports
Requires less number of man-hours
Dual Dics open to 85 degrees
Low cracking pressure and overall pressure drop
Ensures positive closure
Spring-loaded discs calculated to increase the responsiveness of the discs
Alleviates water hammer and resultant damaging effects
Extended long-leg spring
Prevents seat wear caused by scrubbing
Products List
GENERAL APPLICATION
General service piping systems
Water, Oil, gasoline, Chemicals
Gas (compressible gases)
Air (compressed air and blower)
INSTALLATION
SEJIN FS wafer check valves are designed for installation in flanged piping systems, between
two flanges. Valves may be installed in vertical or horuzontal piping. Care must be taken to
always install the valves with the shafts in a vertical position when installing in a horizontal
pipeline. Vertical up flow is always a good installation. Consult factory for vertical down flow.
SEJIN FS wafer check valves are designed to provide long service life if the velocity is kept within
the flow rate shown in the table on page 8~9 and if a minimum of 5 pipe diamaeters of straight pipe in
front of the valve is maintained downstream from a likely cause of turbulence (i.e., pump discharge, reducers or elbows).
INDUSTRY STANDARDS
ASME B16.1, B16.5, B16.34, B16.47 and B31.1
API 594 and 598
MSS-SP-25, MSS-SP-55
API 6A and 6D (as applicable)
MSS-SP-61 (standard for the resilient seated, metal seated when required)