Most check valves are spring-loaded and use a ball or plate to seal the flow in one route. Check valves are built with seats and thus will be able to isolate circuits without having leakage. Balls, plates, poppets or poppets with gentle seals are applied as isolating aspects. Alongside one http://tubing-fitting78765.fitnell.com/27166496/hydraulic-check-valve-an-overview