Under certain conditions, hydrodynamic torque can meet or exceed seating and unseating torques.

在某些条件下，水动力扭矩可能达到或超过阀座和非阀座扭矩。

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For larger valves, heavy duty VS series scotch yoke type actuators provide nonlinear torque characteristic with the highest possible mechanical advantage for seating and unseating the valve.

对于大型阀门，重型VS系列挡车轭类型的涡轮执行机构能够提供非线性特性的扭矩，具有最好的机械性能，适用于阀座和无阀座阀门。

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