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Question:

What is the connection between the valve and the flange seal?

The back of a valve is sealed directly with a flange. What do they want to secure? I saw something called a double disk D219x6. What's this? If I were 150, how big would the pipe be?

Answer:

You need to see how thick your pipe is Match the DN150 flange and, of course, the wall thickness to match
Are standard parts, know the diameter and pressure level, buy ready-made on the line, do not need to know too detailed.
After the valve flange sealing plate is normally called flange blind plate, as they are sealed in the middle of things, generally have metal winding pad or Teflon pad. D219x6 (outside diameter * wall thickness) is the specification of the pipe. As to how big the 150 pipe is, this is the standard piece. When you go to the hardware store or the manufacturer to buy it, it is OK to tell him that it is DN150's flange.

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