Cast steel gate valve has a spare part called stem. How should this stem be selected? What are the precautions?
Common gate valve stem is easy to accumulate welding slag, stone, sediment and other debris, which is not conducive to sealing and flow surface. Moreover, some manufacturers'elastic seat gate valves adopt flat-bottom all-basin through design, which is not easy to accumulate debris, ensure reliable sealing, and make the fluid unimpeded and unimpeded.
In fact, we often go to the valve accessories market to buy the valve stem, the standard is better, can be mass production, basic data and size have a reference standard, if it is not standard, it will be customized, there is an important thing is: cast steel valve stem also has material differences, this small Parts are now used by many manufacturers as a "hands-on" place, in order to maximize their own interests, or to win a customer, let themselves reduce prices, the usual practice is that the valve has 304 to do, but the stem is 321 or other worse, the buyer seldom care about this small accessories, which also guides. To many honest bosses, how can not understand, why their own valve 304 to do up to 28, but some manufacturers sell only 26 yuan. If it doesn't have a big impact, these are also small sales skills, but I hope not to disrupt the entire valve sales market.
