FIELD: chemical, gas, oil industries. SUBSTANCE: device is provided with cylinder embracing the injector unit. One end of cylinder is secured on housing. Hole with seal is provided in face of other end. Hollow rod is made in the form of plunger with axial passage and hole in wall for communicating the passage with interior of cylinder which is also connected with pump. One end of plunger is located in housing and is provided with outlet limiter. Other end of plunger is located in cylinder and is provided with false rod fitted with inlet limiter at free end passed through hole in cylinder face. Diameter of false rod is lesser than diameter of plunger. Besides, device is provided with check valve fitted in axial passage of plunger. Device is also provided with spring fitted on cylinder face for engagement with inlet limiter. EFFECT: enhanced reliability. 3 cl, 3 dwg
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