Latest articles

Links

  • Historically manhole covers have been manufactured from cast iron [3], which is iron that is melted down and poured into a mold. When it comes to manhole cover material, gray cast iron and ductile cast iron are preferred as they are both economical and extremely durable. Gray cast iron is made up of iron alongside alloys including carbon and silicon. It is the carbon that results in the strength associated with cast iron. Ductile cast iron differs from gray cast iron because manganese is added to the molten iron during the casting process, which influences the formation of the carbon, resulting in an even stronger finished product.

  • In power generation, particularly in steam systems, wedge type gate valves facilitate the control and regulation of water and steam flow. Additionally, they are frequently found in chemical processing plants, where robust performance amid corrosive or high-temperature environments is critical.


  • Municipalities also need to establish clear protocols regarding who has the keys to these manhole locks. Proper training and accountability measures must be enforced to ensure that only designated maintenance workers have access to these critical infrastructures.


  • The fully open position of a gate valve can significantly impact not only the flow characteristics but also the longevity of the valve itself. Operating the valve partially open for prolonged periods can lead to mechanical wear, causing premature failure. In contrast, a fully opened gate valve reduces the contact between the fluid and the sealing surfaces, thus mitigating erosion and corrosion.