The Vortex Roller Gate (Square Shut-off Gate) is for handling dry material in gravity flow or low-pressure applications. This gate is available in a wide variety of configurations including rectangular sizes and customer specific hole patterns. The gate valve's live-loaded seals extend the service life by compensating for wear. The seals provide an excellent material seal across the gate and to atmosphere. The seals can also be replaced while the valve is in-line. Similar slide gate valves have seals made of soft packing, rubber or felt, which will erode away over time allowing product leakage.