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Mechanical or hydraulic hoists may be used to move the gates.
7. Ring-Follower Gates.
Ring-follower gates are used as guard gates for penstocks or outlet conduits and
are not suitable for water regulation. A ring-follower gate is a slide gate with a leaf, body, bonnet, and a
hoist, usually a hydraulic cylinder, to move the leaf The ring-follower gate leaf consists of two parts: the
bulkhead part which blocks the fluid flow in the closed position and the "ring" portion which has a circular
opening matching the diameter of the penstock or conduit to provide a unobstructed water passage in the
open position. A ring-follower gate is shown in
8. Ring-Seal Gates.
Ring-seal gates are a type of ring-follower gate with a movable seal and a wheel- or
9. Bulkhead Gates and Stop Logs.
Bulkhead gates and stop logs are installed under balanced, no flow
stop log installations.
Valves, like gates, can regulate flow or act as guard valves to penstocks and outlet conduits. This
section will describe the most common valve types in use in Reclamation facilities.
Tube Valves. Tube valves are used primarily as regulating valves in outlet conduits. The tube valve is
essentially a needle valve with the downstream needle omitted to eliminate the cavitation damage
experienced with normal needle valves. A hollow cylinder or tube is actuated by a mechanical operator to
seal against a valve seat on the downstream end of the valve. Like a needle valve, the fluid way converges
at the outlet. A tube valve is shown in
2. Hollow-Jet Valves.
Hollow-jet valves are used as regulating valves and are similar in construction to a
Butterfly Valves. Butterfly valves are most commonly used as guard valves on penstocks and outlet
This Information is Reprinted From UNITED STATES DEPARTMENT OF THE
INTERIOR BUREAU OF RECLAMATION