Gate Valves is also known as knife valves or slide valves with linear motion in which a flat closure element slides into the flow stream to endow with shut-off. Gate valves are designed in order to minimize strain drop across the valve in fully opened position and stop the flow of fluid absolutely. The direction of fluid flow does not change, and the diameter through which the process fluid passes is effectively equal to that of the pipeline. Hence, they have a propensity to have minimal pressure drop when opened fully.
Gate Valves are most advantageous in applications relating to slurries. They are also used in applications that involve glutinous liquids such as heavy oils, varnish, molasses, honey, cream, light grease, and other non-flammable viscous liquids. They are available in large sizes to handle better thick flow. On the other hand, Gate Valves have low-pressure limitations, and are not most advantageous in applications that require cleanliness or sanitary conditions. They are excellent and efficient to use anywhere a shutoff valve is needed. They can also be used where throttling capabilities are preferred, While this is not generally recommended as erosion of the seat and disc occurs due to the vibrations of the disk in throttling applications.