Gate valve for tar pipelines

Based on the information you provided, it can be preliminarily inferred that the following reasons are to blame: 1. Incompatible materials: Carbon steel gate valves are designed to operate within a temperature range of -29°C to 425°C, whereas the temperature of the tar medium reaches as high as 365°C, exceeding the temperature limit that the valve material can withstand; as a result, the material of the valve is damaged due to the high temperatures. 2. Corrosion issue: Tar is a complex chemical mixture containing many highly corrosive components. If the material used for the gate valve is not resistant to corrosion, then over time corrosion will occur in the flow channels and internal cavities of the valve, which in turn leads to damage to the valve’s sealing surfaces. 3. Improper operation method: When using a gate valve, it must be opened and closed slowly; forceful twisting is not allowed. If the user frequently uses abnormal operating methods, such as suddenly shutting down the gate valve, it will increase the wear on the gate valve, thereby causing damage to the sealing surfaces. To address the above issues, it is recommended to upgrade to gate valves made of materials that are more resistant to high temperatures and corrosion. Additionally, proper usage methods should be followed during daily operations. .

For this Z41H-16C, there are various types available in the market now, including heavy-duty and medium-duty versions and so on. If you are an organization using it, you might not be familiar with this concept. Taking our own manufacturers as an example, for normal medium and heavy-duty valves, aside from the difference in weight, the valve bodies of the medium-duty valves have not undergone heat treatment; many of their elemental components do not meet the required standards. The valve stems are made of medium-carbon steel, so the normal operating temperature is within 250°C. The material for the heavy-duty valve body is quenched and tempered, while the valve stem is made of 2CR13, which meets the required standards; it can function without issue at temperatures up to nearly 400°C. It is recommended to purchase a heavy-duty version and try welding STL on the sealing surface. If that still doesn’t work, then the medium is corrosive; use a different material instead

Petroleum tar has the molecular formula C10H8 and a molecular weight of 128.17; it is a mixture of aromatics, polycyclic aromatics, and heterocyclic aromatic compounds containing nitrogen, oxygen, and sulfur. A black, viscous liquid with the smell of mothballs and tar. It is recommended to use stainless steel plug valves or ball valves.