1. More than the sewage valve must be installed vertically in the horizontal pipe.
2. After cleaning the pipe, the valve can be installed.
3. Counterclockwise turn the hand wheel valve rod drives the valve core move up gradually, sealing face torn off, the spool on the diversion seat gradually moved out of the valve seat hole, forming narrow gap, medium through the orifice on the valve seat symmetry into the seat inside, a small amount of medium can flow through the slit, gradually reduce the system pressure.
1) Continue to turn the hand wheel counter clockwise, the valve core upward movement, the diversion seat on the throttle hole out of the valve seat cavity, more media through the guide seat and valve sleeve after the smooth discharge.
2) To clockwise rotate the handwheel counter clockwise, the spool to move up to the full open position, at this time, medium pressure greatly reduced, the impurities can be discharged directly from the valve orifice area and in the inverted vortex formed at the sealing seat, we clean sealing surface, to prevent adhesion of impurities on the sealing surface.
4. Valve closing process:
1) Clockwise rotation of the valve stem drive spool down, this time the sewage has ended, the system pressure is low, sleeve valve orifice area decreases, the guide sleeve close to the seat and change to the flow direction of medium, medium after throttling to speed through the valve and valve do sealing surface, gradually strengthen the sealing surface of the cleaning efforts.
2) To turn the hand wheel, the diversion valve seat into the valve seat hole, formation of narrow throttling, due to the sewage near the end, medium has less impurity, guide sleeve and the valve seat between the narrow prevented the tiny residual impurities into the sealing surface, medium fast flow through the narrow, thoroughly clean the sealing surface to ensure sealing contact with zero leakage.
3) Continue to turn the wheel, the valve core and the sealing seat contact. Achieve seal.
