3D-Printable Check-Valve

What is a check valve?

A check valve only allows fluid (gas or liquid) to flow freely in one direction (marked by arrow), whilst blocking it in the opposite direction. This valve does not seal perfectly, this is due to the tolerances achievable with 3d printing.

How does it work?

Inside the valve body there is a moveable plug (red) which is puschend by the fluid flow. Depending on the position the plug either blocks the flow path or opens ist.  

valve in the open position	valve in the closed position

Print Instructions

• Material: PLA
• Brim: yes
  • for part “check valve cap” internal brim is recommended. (external brim might cause a bur wich leads to clearance issues) 
• Supports: no
• Layer Height: 0.15mm

Placement on print bed:

Assembly

For Assembly refer to the following image:

Assembly view

Additional thread caps:

The repository also contains a step ("Thread-Cap.step") file which can be modified to make custom attachments.

Thread Profile:

The exact dimensions of the threads are shown in the following image:

Thread Profile