Certification and inspection documents

Service conditions

A check valve opens and closes automatically in response to fluid forces to restrict reverse flow. Its behavior depends on disc motion, velocity, differential pressure and installation orientation. Selection should consider flow changes and pump shutdown, balancing forward pressure loss against closing response.

Cryogenic fluids cause contraction and alter seal and operating conditions. Review low-temperature material behavior, stem-seal temperature management and orientation. System design must address expansion and pressure accumulation wherever liquid can become trapped.