Profile: Sims Pump Valve Co. Inc specializes in pump technology. We manufacture Simsite® structural composites. It is a graphite combination-fiber continuously interwoven and reinforced composite with phenolic/epoxy thermoset resin. It is designed using fibers in an interwoven bi-directional or tri-directional weave. Continuous fibers provide the highest strength and flexibility available on the market. We provide new composite pumps and replacement parts for all centrifugal pumps.