The E5700 series has revolutionized the knife gate industries by offering features not found in standard valves. We start with our investment cast body, one of the first in industry to be offered in a knife gate design. The lost wax concept, allows features & strength to incorporate in the body, not previously found in standard knife gate valves.
Our studies show, that the gate & seat are to most critical area in a valve, and are subject to the most amount of wear. Our designer, have included a fully replaceable seat design, which not only allows for ease of maintenance, but allows for alternate materials to be used depending on the application. The investment cast yokes have been design to offer ease of use, but also incorporates mounting holes for such items safety lockout, and position sensing switches.
Reverse Flow Concept
Standard valves installation suggests flow pushes the gate into the seat, which exposed cavities in the body, with flow line pressure against the packing. This works well in clean fluids applications, but most knife gate valves are installed in slurry applications. The de-watering of solids then become impacted in the cavities, wear the gate, which result in packing leaks.
The reverse flow concept suggests that installing the valve with flow pushing the gate away from the seat. This idea goes against years of experience, but inherently has immediate benefits. First, the upstream port is typically smaller, resulting in higher velocity thru the valve, reducing the opportunity for solid to settle. The sacrificial replaceable seat, acts as a wear component, and is fully replaceable. Second, there are no cavities present for solids to become impacted while being closed. And finally, the sealing surface of the seat is removed from the abrasive flow stream, while the packing will only see a reduced pressure from down stream media while in the closed position. Any de-watering that could occur, only serves to assist with the seal, and becomes washed down stream, with the high velocity flow once in the open position.
