"P" Pump

A revolutionary pump design when it was developed 35-years ago, the radial piston diaphragm design now has a worldwide track record of proven performance in a multitude of industrial, maritime and pipe cleaning applications. The standard "P" pump produces variable flows to 18 gpm and variable pressures to 4,000 psi.

With a standard 5-year warranty, users are able to avoid unanticipated pump repair expenses. There are no interacting parts to wear - no valves, valve seats, springs or seals - and no packing to cool or lubricate. "P" pumps are not damaged if allowed to "run dry" - even at maximum power for hours at a time.

Power end linkage to the water manifold is via cushioned direct drive. There are no belts or sprockets to replace or adjust.

How a Rotary Piston Pump Works:

Each stainless steel barrel holds a resilient rubber diaphragm that is blocked at opposite ends by a poly check valve. Water enters and leaves the diaphragm through these two check valves. As the offset pump shaft rotates, pistons connected to the shaft enter each barrel sequentially through a port machined in the side of the barrel. As a piston enters each barrel, the piston draws oil from the oil filled pump case and presses it into the barrel. This action squeezes the rubber diaphragm and forces water out one of the two check valves, known as the "delivery" valve. In effect, the action is like squeezing a cow's udder. Finally, as each piston withdraws sequentially from the corresponding barrel, water is drawn into the rubber diaphragm through the inlet check valve. It's a straightforward, simple to understand and easy-to-maintain pump.

No parts wear means reduced downtime

At no time does water act on machined parts, springs or seals to create water pressure. As a result, there is never an opportunity for metal parts or seals to corrode or wear, a weakness inherent in the design of triplex and multiplex pumps that is overcome by the rotary piston pump.

Pump a wide array of liquids at variable pressure and flow rates

The rotary piston pump may be used to draw and expel most fluids through the rubber diaphragm. Among these fluids are reclaimed water, sea and brackish water, many solvents and diesel fuel. This feature contributes to the pump's versatile application in a diverse array of industrial, marine and commercial applications. For example, Harben pumps are installed on U.S. and U.K. nuclear powered submarines to cool nuclear reactors with sea water 24 hours a day, nonstop. In addition, the pump has been engineered to achieve multiple flow and pressure combinations to fit specific applications.

Jump Jet Pulsation

The shaft rotates at 1,000 to 1,200 rpm reliably creating constant pressure and flow. However, if an operator elects to divert water from two of the barrels away from the jetter's high pressure hose and return it to the water tank, high pressure water entering the jet hose will pulsate. This creates Harben's "Jump Jet" performance.

The jump jet feature allows operators to jump high pressure hose around radius bends, move nozzles and cutting tools longer distances through difficult-to-climb pipes, penetrate blockages with greater efficiency and free nozzles and cutters trapped by offsets and obstructions.

Because the diversion of high pressure water occurs outside the pump, operators are able to pulsate at the pump's full rated output pressure without damaging water manifolds, a common shortcoming of triplex and multiplex pumps.

* Harben is a registered trade mark of Flowplant Group, Ltd., the parent company of Harben, Inc.