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Double Check Valves
Double Check Valves
New Apollo® 4SG Series double check valves and double-check detector assemblies combine a short lay length with consistently low pressure loss and an extremely flat flow curve to make them the easiest to design into any piping system.
Sized from 2-1/2" to 8", new Apollo 4SG assemblies feature grooved end connections that reduce weight and length. They also allow for the use of lightweight grooved-end butterfly valves as shut-offs. OS&Y or NRS gate valves, with either grooved or flanged end connections, are also available.
Designed, built and tested in the U.S., Apollo 4SG devices employ patented modular check making seat replacement easy. They also feature reversible EPDM seat discs.
The individually accessible check modules make service fast and easy while the valve remains in-line. No special retaining clips or tools are needed. Top-mounted test cocks assure easy testing.
Their epoxy coated ductile iron bodies resist corrosion for long service life in a vari
