| 摘要 |
The apparatus of the present invention relates to a first out indicator valve having a main body portion, with a flow bore longitudinally through the body; an inlet port, an exhaust port through the walls of the body and fluid communication with the longitudinal flow bore; a pilot port of the lower portion of the valve in fluid communication with the longitudinal bore, and a stem movable within the longitudinal bore from a first position blocking fluid communication between the inlet and exhaust port and a second position allowing communication between the inlet and exhaust ports.
|
