SENTINEL Diaphragm Seals and Valves: Protect pumping systems and instrumentation, and enhance all around system performance with our complete line of SENTINEL Diaphragm Seals and Valves.

Check Valves

316 Stainless Steel Check Valves ensure chemical flow only goes in one direction, with quality machined construction for reliability and maximum performance.

By preventing reverse flow, check valves can be used as one-way valves, injection valves, or to prevent backflow. Check valves allow flow in one direction, automatically prevent back flow when process fluid in the line reverses direction, and will work even if the system loses air or electricity. Installed in the process pipe, check valves are flow sensitive and rely on the line fluid to open and close. The internal ball or poppet functions as a positive shutoff to ensure process fluid does not go back up the line. Check valves can be installed vertically or horizontally. Robust construction ensures reliability in the rigorous service of municipal and industrial applications.

  • Check valves are designed to ensure chemical flow only goes in one direction and can be installed vertically or horizontally.
  • The check valve prevents the process fluid from going back up the chemical line as well as the chemical draining into the process.
  • Robust construction ensures reliability in the rigorous service of municipal and industrial applications.

O-Ring Poppet Valves

Features & Benefits
  • Compact length
  • Spring-loaded 2 or 10 PSI cracking pressure
  • Full range of sizes ¼” to 1” MNPT or BSP
  • All 316 stainless steel construction
  • (Hastelloy C and Alloy 20 available special order)
  • Viton® or PTFE O-Rings as standard
  • Pressures to 2,500 PSI
  • Temperatures -15° to +400°F
  • Usable on metering pumps
  • Usable as injection line check valves
  • Contact Blacoh for custom valve inquiries

Ball Check Valves

Features & Benefits
  • Compact length
  • Spring-loaded 2 or 10 PSI cracking pressure
  • Full range of sizes ¼” to 1” MNPT or BSP
  • All 316 stainless steel construction (Hastelloy C and Alloy 20 available special order)
  • Easily disassembled for inspection or cleaning
  • Pressures to 2,500 PSI
  • Temperatures -15° to +650°F
  • Usable on metering pumps
  • Usable as injection line check valves
  • Contact Blacoh for custom valve inquiries