PURPOSE: To prevent the quick turning off of a lamp caused by the dislocation of the working points of a torque switch and a limit switch for the lamp in the operation of a valve, avoid incomplete turning off of the lamp and facilitate the adjustment of the limit switch.

CONSTITUTION: This operation circuit comprises the operation circuit A of an inching type motor valve to which a hold circuit 13 is added. The constitution of this hold circuit 13 is as follows; The operation circuit A and a lamp circuit B are connected in parallel. A limit switch 10 is connected to the limit switch 3 of the operation circuit A in parallel. An auxiliary contact point 11 is connected to an opening side contactor 9 in parallel. This auxiliary contact point 11 and the limit switch 10 are connected to each other by a hold line 14.