HP Performance Optimized Datacenter 20c Maintenance And Service Manual page 52

Replacing the external chilled water isolation valve
Replace the valve (1).
1.
Secure the valve with eight bolts (2).
2.
External pressure gauge isolation valve
The external pressure gauge isolation valve is located on top of the HP POD 20c.
You need an adjustable wrench or an appropriately sized box wrench for installation.
Removing the external pressure gauge isolation valve
Loosen the connection securing the valve (1)
1.
Remove the valve (2).
2.
Removal and replacement procedures 52