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4. Insert a long object like a crowbar into the knuckle valve casing and hook the knuckle valve
tool.
5. Lift the knuckle valve tool up and away from the knuckle valve.
Figure 51 – Removing the Knuckle Valve Tool
6. Make sure the bolts, washers, and nuts are secure.
Do not place your hand inside the knuckle valve housing. The knuckle valve spring is under
tension and can cause bodily harm.
7. Make sure the o-ring is not damaged and is set in the grooves in the flange on top of the
knuckle valve casing.
Figure 52 – Knuckle Valve O-Ring
36
HP PROTECTUS
®
III Installation and Maintenance Guide
Chapter 4: Maintenance and Troubleshooting
Summary of Contents for HP PROTECTUS III
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