Cyclone vacuum valve / Zyklon Unterdruckventil

This Vacuum Valve can prevent container collapse due to high vacuum pressure, especially when the suction hose becomes blocked. By adjusting the spring preload using the screw, this valve ensures closure during regular operation while opening if the hose is obstructed. Additionally, you have the option of directly mounting it next to the cyclone using the cutout version, which accommodates a 110-120mm (4 42/127" - 4 3/4")  flange size.

Required Components:  

• 2x heat-set insert M4x8.1x6.3 (if using the version with heat-set inserts)
• Spring (wire diameter: 0.6mm, outer diameter: 10mm, length: 20-30 mm)
• M4 socket head screw (length varies depending on spring size, for a 30mm long spring, use a M4x50 screw)
• 2x M4 screws for mounting the valve to your container (length depends on the container thickness)
• 1x M4 Nut
• Sealing rubber (soft rubber approximately 1mm thick)
• 28mm and 4mm drill or 1 1/8" and 1/8" drill
• Printed parts 
  • 1x Main body 
  • 1x Insert
  • 1x Washer
  • 1x Plunger
  • Optional: Template for 
    • cutting the rubber seal 
    • drilling holes

Update: I've incorporated a new parametric feature: Insert length adjustment. 

The original insert was designed to fit an M4 socket head screw (head height is 4mm (0.157")) and a container thickness of up to 3mm (0.118"). Now, with this enhancement, customizing the insert for different container thicknesses and screw head heights is even easier. Simply add the screw head height and container thickness together, and input the sum in millimeters into the Move Face operation in Onshape. With this update, I can assure that this valve can fit almost any container and screw combination. 

Link: https://cad.onshape.com/documents/c2229dd07f6228cea7f10b6d/w/ac004a1f699a5de0b577b4dd/e/43ddd693066756844f866ae6?renderMode=0&uiState=65e28607fea1831428920ac4.

Assembly Instructions:

1. Rubber Seal Preparation:

• Start by cutting out the rubber seal. You have the option to glue the rubber seal to the plunger, but it's not necessary.

2. Support Material Removal:

• Carefully remove all support material, paying close attention to the glue-up surface of the main body to ensure a flush alignment with the insert.

3. Main Body and Insert Glue-up:

• Apply adhesive to the mating surfaces of the main body and insert, then securely glue them together. The three flat sides prevent twisting during glue-up, ensuring unobstructed airflow.

4. Heat-Set Installation or Tapping:

• If you're using the version with heat-set inserts, insert them into place. Otherwise, tap the two holes with an M4 tap.

5. Drilling Holes in the Container:

• Drill two 4mm (1/8") holes and one 28mm (1 1/8") hole into the container where the assembly will be mounted. Ensure precision in hole placement to accommodate the components properly.

6. Component Installation:

• Next, securely mount the assembly to your dust container. Then, proceed to assemble the valve components as depicted in the picture.