eccentric ball valve stroke for quarter turn movement, closed, at 0 in 60 to 80 * all open. When the Industrial Valves is in full open position, Lang almost perpendicular to the valve seat and parallel to the logistics ( Figure 4. 35) 。 When logistics move through the body, it is the seat diameter and geometry of throttling valve core and generate the appropriate pressure drop.

in failure - Open mode, logistics to help open the valve core, because the logistics oriented downstream, and the valve core with logistics swinging until it is perpendicular to the seat. Most of the logistics movement through the body center and horseshoe feeding core logistics by minimal resistance when open. When the logistics out of the body, the pressure recovery is complete. When start off valve, the valve core inverse jun flow and moving, limited logistics gradually until the valve core is close to the closed position. At this point, the partial real estate will be accurately the valve core and valve seat for Gou and, bearing surface phase in the valve closed.

in failure - Closed condition, shaft is toward the downstream of the logistics, but must be against the valve core logistics, moved to the perpendicular to the seat. Logistics through the valve body and Industrial Valves core hole to move to the seat, core openings in the Industrial Valves was described to produce small pressure drop, and produce a larger pressure drop in the seat, and the pressure recovery in the downstream piping. When the valve failure, swinging direction valve core ( Close the valve) And logistics is the same, the use of logistics pressure to help shut down.

usually automatic rotary valve is unique characteristics on both sides of the valve can be installed in the pipeline, so the shaft bearing ( Shaft on the shaft toward downstream or upstream) And the failure mode ( Failure - Open and failure - Closed) Using the air of the actuator failure action can be arranged before and after operation, in figure 4. 28 is a very good reference, four common azimuth ( Failure - Closed, shaft towards upstream, air - Open; Failure - Open, shaft towards upstream, air - Close; Failure - Open, shaft toward downstream, air - Close; And failure - Closed, shaft toward downstream, air - Closed) 。

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