Class 150 Cast Steel Gate Valve

Class 150 Cast Steel Gate Valve

Class 150 cast steel gate valve is one of the particular types of the gate valve, which opens by lifting a round or rectangular gate/wedge out of the path of the fluid. Class 150 refers to the pressure/temperature rating of the valve. It means that the nominal pressure is from 1.6MPA to 2.0 MPA. The class applies to steel and alloy steel valve. Definitely, the main manufacturing material would be the cast steel.

Class 150 cast steel gate valve has a full port design with OS&Y, outside screw and yoke and BB, Bolted bonnet. It has a fully guided and flexible wedge. The main parts of Class 150 gate valves are one body, two seats, one wedge, one stem, one gasket, one bonnet, one back seat, several packing, one gland, one gland flange, one stem nut, two eye nut, two pins, two spilt pins, one name plate, one hand wheel, one stem nut and so on. On opening the Class 150 gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. This means that flow rate does not change evenly with stem travel. Also, 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. Typical gate valves are designed to be fully opened or closed. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss.