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Verify the location of Spring and note the direction of the Vilter name
Installation: The new design will apply only to the 2” thru 4” stop valves.
Retrofitting a field installation will require replacing the bonnet
assembly.
The bonnet must be installed with the spring towards the bottom (see
illustrations above). The drill fixture is designed so that the hole for the spring
will always be drilled on the opposite side from the cast in Vilter name on the
bonnet. From the outside of the valve, the casting numbers must always be
towards the top of the valve.