Class IV Shut Off
If an application requires the valve to modulate clean fluid, there are several designs that will provide both tight shut-off and control. However, when the media contains solids (i.e. slurry), there is no perfect valve. The designs typically chosen to modulate slurry will provide tight shut-off when brand new, but often leak shortly after being in service.
SlurryFlo control valves provide Class IV shut-off when new and well into their service life. The unique metal-to-metal seating surface overlaps to maintain Class IV, even after substantial wear. A Class IV shut-off isolates 99.99% of the flow.