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Check Hubs

Product Name: Check Hubs

Subject: Check Hub Improvement


The internal operation of the check hub is changing from an o-ring, ball, and spring sealing method to a single diaphragm sealing method. The check hub consists of three sets of these sealing components to isolate the products.

In some cases with the ball and o-ring sealing method, the o-ring could move out of position in a high flow condition or if the ball sticks to the o-ring while opening. This condition may affect the seal between the o-ring and ball or valve body and cause some solution to seep by the seal. These occurrences are somewhat rare and most times it will re-seat itself and continue to work. The update changing to the diaphragm sealing method has less components and opportunities for the sealing points within the check hub to not seat properly and allow product to flow backwards through the checkpoint.

Immediate action if problem arises:

If there is a problem with the P21000001 ball type check hub seeping solution backwards through one of the ports it can be corrected as follows:

  • Pull the line off, remove the orifice tips and flush the check hub out with water.
  • Use compressed air if available, apply a small amount of air onto the outlet barb (single barb side), which will force the check balls tightly against the o-ring and reseat the o-rings. If air is not available, use a small object like a paper clip wire or tooth pick gently insert through the inlet port of the leaking port (side with three barbs) and move the check ball up and down a few times. This alone may reseat the o-ring. Please be sure to wear safety glasses while fixing the o-rings.
  • Replace the orifice tips and reinstall in the system.

If problems persist with the unit, replace the unit with the P21000013 Diaphragm Check Hub.

Long term resolution:

P21000013 Diaphragm Check Hubs are the only valve shipping from the CSI facility at this time.

Also note: Check Valve / Hub issues can also be caused by debris getting in-between the sealing surfaces and also cause orifice tips to plug up. Debris can get into systems in multiple ways from routing tubing, installation of reservoirs, or debris falling into openings in the solution containers are some examples. Cleaning Systems, Inc. has available inline filters (P21050002) with a 200 mesh screen that can be installed into the ¼” ID tubing connected to the inlet of the check hub to remove debris from the solution lines before causing issues.

Check Hub