The Swing Check Vavle is used for single-directional flow in a horizontal pipeline and/or to isolate product in a multi-product handling system. Poppet and seats are metal and may allow some seepage over long periods of time. Expansion relief is available (except in the 246 AL).

Cold, non-shock pressure limit is 200 PSI WOG in Fig. 246A and 125 PSI WOG in Fig. 246AL.