Create an Onshape.com account.
Get familiar with the 5 introductory lessons.
(There are plenty of other lessons available, too.)
Print out the drawings for the UM Valve: UM Valve 2016
As you go through the videos, try to model each component in the following order:
- 5000-005 End Plate
- 5000-006 O-Ring (use revolve)
- 5000-003 Operating Knob
- 5000-001 Valve Body
- 5000-002 Fulcrum
- 5000-004 Spool
- 5000-007 Lever
Then create an assembly of the components.