GEM 653 User Manual (English)

Questions and Answers:

H
Heidi CampbellJul 27, 2025
What to do if GEM Control Unit valve leaks downstream?
- D
  douglasguerraJul 27, 2025
  If the GEM Control Unit valve leaks downstream (doesn't close fully), it could be due to several reasons. The operating pressure might be too high; ensure it matches the data sheet specifications. There might be foreign matter between the shut-off diaphragm and valve body weir; in this case, remove the bonnet and clear any debris, inspecting both the diaphragm and valve body for damage, and replace if needed. The valve body weir could be damaged, requiring replacement of the valve body. A faulty shut-off diaphragm should be checked for damage and replaced if necessary. For special versions "F (MAG / LOC)," make sure the locking device is unlocked. Finally, the seal adjuster might be incorrectly set.
C
cooperkathleenJul 31, 2025
Why doesn't my GEM Control Unit valve open fully?
- R
  Robin DeckerJul 31, 2025
  If the GEM Control Unit valve doesn't open fully, several factors could be at play. The bonnet might be faulty, necessitating replacement. Also, the shut-off diaphragm could be incorrectly mounted; remove the bonnet, inspect the diaphragm mounting, and replace it if needed. Check if the stroke limiter is incorrectly set and reset it. If you have a special version "K (MAG / LOC)," ensure the locking device is unlocked.
W
wcoleAug 5, 2025
How to fix a GEM Control Unit valve leaking between bonnet and valve body?
- T
  Timothy PattersonAug 5, 2025
  If the GEM Control Unit valve leaks between the bonnet and valve body, several issues could be the cause. The shut-off diaphragm might be incorrectly mounted; remove the bonnet, check the diaphragm's mounting, and replace if necessary. The bolting between the valve body and bonnet could be loose; retighten it. A faulty shut-off diaphragm should be inspected for damage and replaced if needed. Lastly, the bonnet or valve body itself could be damaged, requiring replacement.
S
staceygreenAug 8, 2025
What to do if the GEM Control Unit handwheel cannot be turned?
- M
  Meghan WilliamsAug 8, 2025
  If you can't turn the handwheel on your GEM Control Unit, it might be due to a faulty bonnet, which would need replacing. Another possibility is that, if you have a special version "B (MAG / LOC)," the locking device is closed, so unlock it. Also, the threaded spindle may be seized; depending on operating conditions, try regreasing it, or replace the bonnet if necessary.
A
amanda53Aug 13, 2025
How to stop GEM Control Unit valve body connection to piping from leaking?
- O
  Oscar GutierrezAug 14, 2025
  If the GEM Control Unit valve body connection to piping leaks, it could be due to incorrect installation. Check the installation of the valve body in the piping. Loose bolting or threaded connections could also be the cause; tighten them. Finally, faulty sealing material may be the issue; replace it.
A
Adam GarciaAug 17, 2025
Why is working medium escaping from the GEM Control Unit leak detection hole?
- O
  Oscar MorganAug 17, 2025
  If the working medium escapes from the leak detection hole of the GEM Control Unit, it indicates a faulty shut-off diaphragm. Check the shut-off diaphragm for damage and replace it if necessary.
S
Sean HernandezAug 22, 2025
What causes a GEM Control Unit valve body to leak?
- R
  Robert VargasAug 22, 2025
  If the GEM Control Unit valve body leaks, it may be faulty or corroded. Inspect the valve body for damage and replace it if necessary.