277 Cat Pump Nickel Aluminum Bronze

Cat Pumps 277 Brass Triplex Plunger Pump (3.5 GPM, 1500 PSI)

The Cat Pumps 277 is an industrial-duty, 3-frame triplex positive displacement plunger pump engineered for high-pressure, continuous-duty liquid transfer in harsh environments. Constructed with a premium Nickel Aluminum Bronze manifold and precision-machined 316 stainless steel valve assemblies, this pump offers superior corrosion resistance and structural strength. This specialized metallurgy makes it an ideal, high-efficiency choice for demanding applications such as reverse osmosis (RO), desalination, and intermittent-duty seawater handling where standard brass components would prematurely degrade. Its internal wet-end features highly polished, solid ceramic plungers that provide a true wear surface to minimize friction and heat, significantly extending seal life under rigorous industrial conditions.

Designed to maximize uptime and efficiency, the 277 model delivers a steady, low-pulsation flow rate of 3.5 gallons per minute (GPM) while operating at a maximum pressure of 1,500 PSI. Driven at an optimal speed of 1420 RPM, it features a durable die-cast aluminum crankcase with splash oil lubrication to ensure maximum load capacity and bearing life. The pump comes standard with NBR (Buna-N) seals and O-rings, allowing it to safely handle liquid temperatures up to 160°F (71°C). Its compact footprint and versatile design permit multiple drive configurations—including belt drive, clutch, or direct-drive with a bell housing and flexible coupling—providing a highly reliable fluid handling solution for aggressive liquids and high-salinity water systems.