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A closed, clockwise rotation of the handwheel, stem began to decline and make a sphere out of the seat begins to rotate.
2 Continue turning the handwheel, the single coil solenoid valve stem by the spiral groove embedded in its role of guide pins, so that the stem and the sphere at the same time rotated 90 °.
3 near the closed sphere in the case of contact with the seat rotated 90 °.
4 handwheel is turned the final laps, the stem at the bottom of the angular plane mechanical wedge to the oppression of the sphere, so that it closely pressed on the seat, to achieve complete seal.