Pros And Cons Of Cast Steel Globe Valve

China cast iron globe valve supplier shares this article with you.

In recent years, since the appearance of the sealed valve, the medium flow direction of the cast steel globe valve has changed from above the valve disc to the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, and the force to open the valve is large. The diameter of the valve stem can be reduced accordingly. At the same time, this type of valve is also tight under the action of the medium.

China cast iron globe valves to have a simpler structure than gate valves and are easier to manufacture and maintain. The sealing surface is not easy to wear and has good sealing performance. There is no relative sliding between the valve disc and the sealing surface of the valve body when opening and closing. Therefore, the abrasion is not serious, the sealing performance is good, and the service life is long. When opening and closing, the valve plate stroke is small, so the height of the cast steel globe valve is smaller than that of the gate valve, but the structural length is larger than that of the gate valve. Closing is more laborious, and the principle is the time to open and close the door.

The fluid resistance is large because the medium passage in the valve body is tortuous, the fluid resistance is large, and the power consumption is large. When the nominal pressure PN≤16MPa, the medium flow direction is generally adopted, and the medium flows upward from the valve disc; when the nominal pressure PN≥20MPa, the reverse flow is generally adopted, and the medium flows downward from the valve disc. Increase the sealing capacity. When the cast steel globe valve is in use, the medium can only flow in one direction, and the flow direction cannot be changed. When fully opened, the valve disc is often corroded. The stem axis of the cast steel globe valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it has a very reliable closing action, which makes the valve suitable for cutting off or regulating and throttling the medium.

Cons of carbon steel stainless steel globe valve:

The fluid resistance is large, and the force required for opening and closing is large. It is not suitable for media with large particles, high viscosity, and poor adjustment performance.

Pros of cast steel globe valve: double-sealed design if the bellows fail, the valve stem will prevent the packing from leaking, and conform to international sealing standards, no fluid loss, reduced energy loss, improved plant equipment safety, and have a long service life, reduce maintenance times, reduce operating costs, sturdy and durable bellows seal design, ensure zero stem leakage, and provide maintenance-free conditions. The bellows-sealed cast steel globe valve adopts a bellows-sealed design, which completely eliminates the shortcomings of ordinary valve stem packing seals, such as aging and easy leakage. It not only improves the use of energy efficiency, but also increases the safety of production equipment, reduces maintenance costs, and provides a clean and safe working environment.