How to choose the stem of cast steel gate valve

Cast steel gate valves have a component called the valve stem. How should this valve stem be selected? What are the other precautions?



The common gate valve stem is prone to accumulation of welding slag, stones, mud and other debris, which is not conducive to sealing and flow surface. In addition, some manufacturers' elastic seat seal gate valves adopt a flat bottomed full basin straight through design, which is not easy to accumulate debris and ensures reliable sealing, allowing fluid to flow smoothly.

In fact, it is the valve stem that we often buy from the valve accessories market. The standard is better and can be mass-produced. There is a reference standard for basic data and dimensions. If it is non-standard, it needs to be customized separately. Another important thing is that the valve stem of cast steel gate valve also has material differences. This small accessory is now used by many manufacturers as a "hands-on" place. In order to maximize their own interests or win a customer, the usual practice is to make the valve with 304, but the valve stem is 321 or other worse. Buyers rarely pay attention to this small accessory, which also leads to many honest bosses who cannot figure out why they want to lower their prices. A 304 valve costs 28 yuan to make, but some manufacturers sell it for only 26 yuan. If it doesn't have a significant impact, it's okay. These are also small sales techniques, but I still hope they don't disrupt the entire valve sales market