An operating fluid injection / recovery unit of the organic Rankine cycle according to an embodiment of the present invention, a supply heat from the high heat source to the working fluid by blocking each of the evaporator, both end portions to evaporate the valve is equipped with a working fluid evaporated in the evaporator sikimyeo is injected at a high pressure thermal energy is converted into kinetic energy and compress the turbine, the condenser, the working fluid the heat of the working fluid produced to work in the turbine is released into the low heat source to produce an entropy state, etc., to the suction side organic Rankine cycle system including a pump which is connected to the drain port; One end of the refrigerant injection passage connected to the drain port; A plurality of refrigerant cylinder that is coupled in parallel through a manifold that is coupled to the other end of the refrigerant injection passage; Compressed air injector to supply the compressed air to each of the refrigerant cylinder; And one end of a vacuum pump connected to said organic Rankine cycle system at one side; and characterized in that it comprises a.
According to the present invention, when the start-up, and repair of an organic Rankine cycle system, and quickly to minimize leakage in the process of injecting a working fluid for a restart after the inspection, injection, and must recover the working fluid, the loss of the working fluid and It can minimize the number of time.