Wegman valves offers various types of check valves
Swing check valve
The closure part of the swing check valve is doing what it says in the name, it’s swinging.
It opens up by the flow and drops down to the seat when the flow stops and it’s getting pushed to the seat when the flow turns in direction.
Available in forged body material and usually from 2 “and up in cast version.
Standard the disc is not fully opening so if a pig should pass then select one in accordance with the API 6D standard.