A guide tube stem extension for a butterfly valve isan accessory that extends the valve's operating mechanism to a more accessible location. It is used when the valve is installed in a hard-to-reach area, such as underground, inside a pit, or elevated in a riser system. The guide tube protects and stabilizes the moving inner stem while it transfers the rotational force from the operator (a handle, gear, or actuator) to the valve's internal disc.
Components and types
A guide tube stem extension typically consists of two main components:
Inner stem extension:An extended rod or shaft that connects the valve's stem to the operating handle or gear assembly.
Outer guide tube or housing:A sleeve that encases and protects the inner stem. This prevents debris from interfering with the stem's operation and provides stability, which is especially critical for buried applications.
Extensions are available in several configurations:
Single-piece stem extensions:Used when the valve is not completely buried, allowing the moving stem to be exposed.
Two-piece stem extensions:Feature a protective outer housing over the inner stem, designed for buried service or other applications where the stem requires protection.
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