Steps below will guide on converting Node (like Junction or Hydrants) to Isolation Valve.

Steps to Accomplish

A)  Create a Selection Set

 1) Select the desired elements. It can be selected as shown below or by creating a windw (by clicking and draging).
 2) After selecting, right click > Create Selection Set.
 3) Give a name when prompted.
 x) Above steps and media below can also be found at:
http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/how-to-create-a-selection-set.aspx
http:/communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/how-to-create-a-selection-set.aspx" target="_blank">

B)  Batch Morph elements from Junction to TCV (or GPV or PBV)

1) Create a selection set OR simple select the elemnts that you like to morphed to something else.
2) Tools > Batch Morph
3) Depending on whether you have a selection set or elements selected in the model, select appropriate radio button. In the media below, Selection is used as elements selected the drawing are planned to use.
4) Select the desired type of element and click OK.
x) Above steps and media below can also be found at:
http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/how-to-batch-morph-elements-from-one-type-to-another.aspx

C)  Convert TCV, GPV or PBV to Isolation Valve

1) Open up Skelebrator (Tools > Skelebrator Skeletonizer)
2) Right click on Inline Isolating Valve Replacement and click on Add Inline Isolation Valve Replacement
3) Put a check mark on TCVs, GPVs, or PBVs (depending on elements that you like to convert to)
4) [Optional] You may add some condition under Conditions tab.
5) [Optional] Click on preview button.
6) Either click on Manual or Automatic button
x) Above steps and media below can also be found at:
http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/how-to-convert-tcv-gpv-or-pbv-to-isolation-value-using-skelebrator.aspx