| 摘要 |
A position indicator is used to indicate the opened and closed positions of a rising stem valve. A sleeve is provided which is adapted to be attached to a handwheel and turns with the handwheel. A tubular shell is provided which is adapted to be attached to the valve stem and to be disposed within the sleeve so that it raises, lowers and rotates with the stem. At least one magnet is supported within the sleeve to rotate therewith. First and second reed switches with associated wiring are supported by the shell to be raised and lowered relative to the magnet for closing of the switches at the opened and closed valve positions.
|
