Industrial Excess Flow Valves
Choice of tube, pipe, or face seal end connections
increases system versatility
lowers overall cost.
The spring-loaded poppet remains in the open position during normal system operation. Should an excess ow condition occur downstream, the poppet rapidly moves to the tripped position, stopping uncontrolled release of system media. When the system pressure equalizes through the bleed vent, the spring automatically resets the poppet to the open position. The ow through the bleed vent of a standard XS series valve is less than 1 % of the ow rate in the trip range.
Medium- and low-flow springs are available as an option. For valves with either of these spring options, the flow through the bleed vent may be greater than 1 % of the flow rate in the trip range. See the Swagelok XS Series Excess Flow Valve technical report, MS-06-11, for more details.
improves performance and reliability
provides high-ow capacity
eliminates nuisance tripping.
allows valve to work in any
orientation, enhancing system safety.
eliminates complex bypass mechanisms
allows spring to reset poppet automatically.
All metal seat
Ratings based on uorocarbon FKM O-rings. See Optional O-Ring Materials, page 4.
Pressure ratings may be limited by the end connection. See Ordering Information and Dimensions, page 4.
ASME Class Material Group Material Name Temperature, °F (°C)
2500 2.2 316 SS Working Pressure, psig (bar)
–10 (–23) to 100 (37) 200 (93) 250 (121) 300 (148) 400 (204)
6000 (413) 5160 (355) 4910 (338) 4660 (321) 4280 (294)
For more information about valves with tube fitting end connections, see Swagelok® Tubing Data, MS-01-107.