10691-13-N-1-E, Watson McDaniel,

The R-Series & the 10691-Series Back Pressure & Relief Valves relieve upstream pres sure in a variety of pro cess es. R-Series has a stainless steel disc and the 10691-Series has a soft elastomeric disc for tight shut-off. These valves automatically maintain desired max i mum pressure in a vessel or system by re liev ing excess pressure into lower pres sure re turn line or to atmosphere. Ideally suited for use as pump bypass con trol valve by maintaining constant pump dis charge pressures. Used as a continuously operating valve or for protection against intermittent overpressure conditions.

NOT TO BE USED ON STEAM.