cast steel gate valve

cast steel gate valve

A cast steel gate valve is constructed from cast steel material, opens by lifting a round or rectangular gate/wedge out of the path of the fluid.. It takes the advantage of the structures of gate valve as well as the properties of its material.

Cast steel gate valve’s the sealing surfaces are between the gate and seats are planar.Therefore gate valves are often used when a straight-line flow of fluid and minimum restric?tion is desired. The gate faces can form a wedge shape or they can be parallel. A partially open gate disk tends to vibrate from the fluid flow. Most of the flow change occurs near shutoff with a relatively high fluid velocity causing disk and seat wear and eventual leakage if used to regulate flow.Bonnets provide leakproof closure for the valve body. Screw-in bonnet is the simplest, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection and cleaning. It also gives the body added strength. This construction is adopted for valves for high pressure service, typically in excess of 15 MPa (2250 psi).

Steel is an alloy of iron and carbon. It is produced in a two-stage process. First, iron ore is reduced or smelted with coke and limestone in a blast furnace, producing molten iron which is either cast into pig iron or carried to the next stage as molten iron. In the second stage, impurities are removed and alloying elements are added to produce the exact steel required. Steel then turn molten steel into blooms, ingots, slabs and sheet through casting, hot rolling and cold rolling.