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ROYEON ENTERPRISES Knife Gate Valve Overview

Knife gate valves were originally designed for use in the pulp and paper industry. Utilizing a sharp, beveled edge, a knife gate was ideally designed to cut through the stringy pulp encountered in the pulp and paper industries. The benefits of knife gates also include that they are easy to actuate and cheap to produce. As a result, use of knife gate valves quickly expanded into numerous other markets, including wastewater treatment, oil and gas, mining, and power, in a short period of time. Knife gate valves became advantageous in sludge and slurry applications because their blades can cut right through thick liquids easily.
Today, a knife gate valve can be found in many processing plants. They are available in large sizes to better handle thick flows of heavy oils, light grease, slurry, paper pulp, varnish, and wastewater. However it is important to note that knife gate valves have low-pressure limitations.
Even though knife gates handle liquids and gases well, their utility is greatly diminished when used in dry bulk applications. The knife gate is designed to seat the blade into an elastomer seal after the blade cuts through the material. Thick liquids easily glide over these soft seals with no interference. In contrast, when a powder or a solid passes through a knife gate, the dry bulk material packs into the soft seals against the end of the gate. The seals become abraded and, over time, the blade will not close tightly. This prevents positive air and material shutoff. The knife gate starts to leak material dust. In both situations, you will need to replace the knife gate’s seals once it begins to dust, and depending on the valve and its placement, it may be necessary to remove the entire valve out of the system line to replace the seals. This can be cumbersome as knife gates are generally constructed of heavy metal cast iron. The weight of the valve makes it very difficult to maintain while in place, or to replace.

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