Advantage and disadvantage with segment ball valve and double seat control valve

   Due to double seat control valve has two upper and lower valve seats, So the unbalance force is small, it is suitable for occasions where the pressure difference is so large and the requested leakage is not so high. The equal size double seat control valve can also be used for less standard requirements actuator.  however, double seat control valve has a messy flow path, large resistance for movement, and adjustable range is so small. When valve stem moves up and down, the valve spool has poor stability, and the oscillation is so large.

Segment ball valve has great advantages over the straight-stroke double seat control valve. These advantages are determined by the construction of the segment ball valves. The ball of the segment ball valve is constructed with eccentric structure. Including closed orientation,  Seat does not touch the rest of orientation, which reduces wear and tear, and the valve disc will separate from seat once disc was opened, And then reducing the operating torque.  V-shaped opening on the valve disc can be ensure the adjustment performance when the valve at a small opening degree, and solve the problem that the straight-stroke valve with poor working characteristics at a small opening degree .

Segment ball valve has great advantages over the straight-stroke two-seat control valve. These advantages are determined by the construction of the V-type ball valve. The valve core of the V-type ball valve is constructed with a migraine structure. In addition to the closed orientation, the core seat does not touch the remaining orientation, which reduces wear and tear, and the valve core disengages the valve seat once it is opened, reducing the operating torque. The unique V-shaped opening on the valve core can ensure the adjustment performance of the valve at a small opening degree, and solve the problem that the straight-stroke valve has poor working characteristics at a small opening degree. ?

The flow path of segment ball valve is simple, It is the single straight-flow type, small movement resistance and large adjustable scale. The pressure recovery coefficient of the flow-opening valve is higher than that of the double seat valve.

The valve disc and the valve stem of the segment ball valve are rolled in the same way Compared with the linear motion valve, which can overcome the pressure difference, which is 2.5 to 10 times than that of the straight stroke valve.