Patent ID: 8365766

Claim:
An observation valve structure, comprising a pipe connector which is composed of a connector body, an outlet pipe joint at an outlet end of the connector body, two observation mirror assemblies and an inlet pipe joint at an inlet end of the connector body, the pipe connector comprising an annular gasket at the outlet end of the connector body, the pipe connector comprising a driving shaft assembly and a ball shutter which is disposed in the connector body and driven by the driving shaft assembly, the driving shaft assembly comprising a driving rod, an upper end of the driving rod inserting through a holder disposed on the connector body, a through hole of a plate disposed on the holder and a rotation hole of a handle of the driving shaft assembly and locked with a nut, the ball shutter having a main passage and a secondary passage which are perpendicular to each other, a side passage which is located opposite the second passage and perpendicular to the main passage and a stop wall opposite the main passage, and characterized by: the inlet pipe joint having an outer threaded section at an inner end thereof, an annular guide groove in the inlet pipe joint, guide holes at the inner end thereof and a stop trough at the inner end thereof for insertion of another annular gasket, the annular guide groove communicating with the guide holes, the plate having the through hole being placed on the holder, the plate having a top surface with characters which are perpendicular to each other, a position hole disposed close to the middle character and two apertures disposed at an outer side of the other two characters for insertion two screws which are screwed in two threaded holes of the holder close to the inlet end of the connector body, the handle having an indication plate with a positioning bead hole, the positioning bead hole being provided with a positioning bead; through a right side or a left side of the indication plate limited by the screws or the positioning bead slid into the positioning bead hole, the handle cooperating with the characters of the plate to control rotation of the ball shutter, two opposing sides of the ball shutter being airtight through the two annular gaskets.