Directing against the fault of slide valve's automatic suspension action in emergency governor

experimental verification and theoritical calculation have been carried out

it is found that the main cause leading to the said fault is the result of air detaining in the oil system

and the improvement measures have been suggested as follows: (1) increasing the diameter of compressive pipeline; (2) eliminating the cutoff valve and throttle plate

to use DN32 type nonreturn valve; (3) adopting miter joint connecting mode between branch tube and manifold

to decrease the resistance head and increase the flow rate. After improvement

the said fault has been eliminated

preventing effectively the unit from occurrence of impulsing to turnround at full speed and of overspeed fault.