100 series0 pages
100 Series
0 to 25 psig Check Valves
Features & Benefits
Low pressure
• Lightweight check valve for pressures to 25 psig.
Ultra-sensitive
• Unique design allows flow with minimum pressure
differential. Cracking pressure is 4˝ H2O maximum.
Positive sealing
• Unique knife-edge on the poppet positions snugly to
provide zero sealing even with extremely low pressure.
Zero leakage
• Compact, easy installation. Efficient, inline design reduces
size and weight. The valve can be mounted in any position.
Technical Data
Connection Sizes
Aluminum, brass, steel, 303 or 316 stainless steel
Buna N or Viton®
25 psig (1.7 bar)
4˝ H2O maximum
−40° F to +400° F (−40° C to +204° C)
Based on o-ring & body material, see “How to Order”
1⁄8˝ to ¾˝
Note: Proper filtration is recommended to prevent damage to sealing surfaces.
How it Works
Open
Full flow passages offer minimum restriction to flow. Spring is
completely removed from flow path
Circle Seal Controls
2301 Wardlow Circle • Corona, CA 92880
Phone (951) 270-6200 • Fax (951) 270-6201
www.circlesealcontrols.com
Closed
As the inlet supply pressure decreases, a light spring closes
the poppet, positioning the knife-edge automatically in line of
contact sealing against the o-ring. The impression of the knife
edge is limited by a metal-to-metal seat, which carries the reverse
pressure load and serves to prevent sticking of the o-ring.
check valves
Body Construction Materials
O-ring Materials
Operating Pressure
Cracking Pressure
Temperature Range