The slide valve uses the simplest and oldest mechanism to control the fluid flow. A long time ago, they used a rectangular valve that was placed in a grooved mold on both sides to control the flow of the stream. In these valves, when the valve valve, which can have rectangular or round shapes, is placed in the valve, the flow of fluid is stopped, and on the contrary, when this sliding valve reaches its position, the fluid continues its path without any resistance or pressure drop. to give In the industry, these valves are usually used as flanges to prevent leakage from the respective washers. Due to the fact that the flow of fluid has a linear and specific relationship with the opening of the valve, the valve cannot be used for the full control of the fluid flow, except for those that are specially designed, and most of the valves are closed or open. Very long working life and no sedimentation, disconnection and disconnection of flow in the water supply of treatment houses, sewage, irrigation, engine houses, dams, hydropower plants, etc. are the advantages and reasons of using rubber tongue washer. It is necessary to mention that this product is item
