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Hunt Valve’s proportional poppet valve for descaling pump bypass applications lasts three to five times longer than traditional poppet or automatic recirculation control (ARC) valves. The valve’s ceramic technology optimizes the component’s useful service life while the electromechanical actuation eliminates pilot shifting.

Cutting Edge Technology to Fight Water Hammer

At steel mills, persistent water hammer from quick-shifting poppet-style descale pump bypass valves often leads to burst pipes, cracked welds and descale header damage. Hunt Valve’s proportional poppet valve eliminates water hammer in the system using a variable speed stroke profile—a technology that no other company is using for descale valves in the steel industry.

The stroke speed of the proportional ceramic pump bypass valve is programmed to travel at the closing or opening time/speed required to eliminate water hammer from the system. The rate of closure can be fine-turned via the integrated local control interface or programmable logic controller (PLC) to an optimum level for the hydraulic system. A typical stroke profile is rapid-closed and then transitioned to slow-close for the last 10–20% of the stroke or slow-opened until pressure is equalized between the valve and the pressure breakdown orifice.

Electro-Mechanical Linear Actuator

Minimizing the effects of water hammer and system shock, the proportional pump bypass valve promotes safety, reduces annual operating costs and decreases unscheduled downtime in the plant. In addition, Hunt Valve is the only company using electro-mechanical linear actuator technology in its proportional poppet valve design to eliminate the shifting reliability issues commonly associated with media pilot valves.