Two-seat regulator because there are two seats up and down, so the imbalance is small, suitable for the pressure difference is relatively large, the leakage requirements are not high occasions, the same caliber of the two-seat regulator can also be a little bit smaller specification requirements of the actuator; But the two-seat regulating valve flow complex, flow resistance, adjustable range is small; The valve stem moves up and down, the spool stability is poor, vibration is large.
PVC compact ball valve than straight stroke of the two-seat regulator has great advantages, these advantages are determined by the structure of PVC compact ball valve. PVC compact ball valve spool in the structure of the eccentric structure, in addition to the closed position, the core seat does not contact the rest of the position, reduce the wear, once the spool opened off the seat, reduce the working torque. At the same time, the unique V-shaped opening on the spool can well ensure the regulating performance of the valve in small opening, and solve the problem that the straight stroke valve works in small opening badly.
PVC compact ball valve flow path is simple, single straight-through, small flow resistance, adjustable range, flow open valve pressure recovery coefficient is higher than the two-seat valve, more suitable for the occurrence of cavitation. PVC compact ball valve spool, stem movement for rotation, and linear movement compared to the valve, can overcome the pressure difference, is 2.5 to 10 times the straight stroke valve.
When solving the problem of high temperature, PVC compact ball valve adopts rigid and flexible elastic hard seal to solve the core seat holding and card problems caused by expansion at high temperature, and adopts high-temperature wear-resistant packing to ensure the reliability of stem sealing at high temperature.