| http://www.w3.org/ns/prov#value | - I usually place a union close-coupled just below the gate valve, so I can clear pebbles or other debris that might accumulate in the cavity at the bottom of the valve and prevent the valve from closing completely.Sometimes, instead of adding a valve, the connector between the penstock and the intake pipe, such as a rubber compression union, can be removed to keep water out of a penstock.
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