Di/Da-Designation of connections
The shut-off valves and other connections for reciprocating compressors are named according to the following rule:
Di19 / Da25 / TT |
Inside diameter of the connection in mm, rounded up/down as necessary |
Di19 / Da25 / TT |
Outside diameter of the connection in mm (if suitable for welding), rounded up/down as necessary |
Di19 / Da25 / TT |
Maintenance connections (position and quantity, not for bushes) |
If necessary for differentiation, the hole spacing of the flange connection is also indicated in mm, e.g. "LA52". |
![Model of valve Di19/Da25/S/TT. For designation, the diameters are rounded up/down as necessary. The real values are 19.15 mm and 25.4 mm.](../Images/png/403360523__Web.png)
Sometimes (especially with screw compressors) another designation is used: Brazing-welding designation of connections.
For the actual valve bodies and also for individual bushes, there is a more detailed nomenclature (Nomenclature of valve bodies, Nomenclature of brazing and welding bushes).