Tilting disc check valves, otherwise called “equilibrated disc check valves”, have the well known features of a typical “no slam” behavior. The disc is maintained open in equilibrium by the fluid flow and when it stops the reversed flow makes the disc move to the closed position by rotating it against the seat, not slamming into it as it happens in a swing check valve.
Such a valve is obtained in case of lower range pressure classes (ANSI 150# and 300#) in the so called bolted bonnet configuration. Indeed the body (cast construction) is in two halves with a bolted connection at 45 degrees angle in relation to the horizontal axis of the valve.
FLUITEK ORSENIGO VALVES has a unique design that eliminates that bolted connection (and consequent possible leakages to the external) while maintaining the basic features of the tilting disc. No change in possible maintenance necessities: both configurations require disassembling of the valve from the line to access to the internals.