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Stem Extensions for Underground Service
In underground installations, the drain and sealant injection
ports should be piped to the surface. This is to provide for
ease of access during maintenance work.
The height of the stem extension should be based upon the
distance between the centerline of the valve body and the
centerline of the gear box.
Special coatings such as Fiberglass Reinforced Plastics
(FRP) and epoxy coatings may be specified to prevent
corrosion when burying the valve underground.
Body Relief Valves
When the temperature of the flow medium inside the valve body rises,
excessive pressure can build up and affect critical components inside
the valve.
To relieve this excessive pressure, a relief valve located near the top of
the valve body will open automatically.
Pressure Self-relief
The seat has been specifically designed to automatically relieve
excessive internal body pressures caused by rising temperatures, even
without the necessity of an external pressure relief vent.
