
Removing the Knuckle Valve
To remove the knuckle valve, complete the following steps.
1. Place the knuckle valve top plate back on top of the knuckle valve housing as a safety
precaution.
2. Remove the two smaller bolts from the side of the knuckle valve housing until you hear a
popping sound.
Figure 41 – Knuckle Valve Housing - Small Bolts
3. Remove the cover plate.
Do not place your hand inside the knuckle valve housing. The knuckle valve spring is under
tension and can cause bodily harm.
4. Using a long object, such as a large wrench, tap the back of the knuckle valve linkages until
the knuckle valve assembly falls into the meter body.
Figure 42 – Inside the Knuckle Valve Housing
HP PROTECTUS
®
III Installation and Maintenance Guide
31
Chapter 4: Maintenance and Troubleshooting
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