Patent ID: 8181705

Claim:
Device for injection of fluids in a process fluid, where the device comprises an outer hollow housing with at least one inlet and outlet, a pressure inlet and an internal body movable within the outer housing in a longitudinal direction of the outer hollow housing, where the internal body comprises an orifice and at least a slot being connected by an internal mainly longitudinal bore for flow of injection fluids from the inlet to the outlet, which outlet in a closed position is closed with a seal system between the outer hollow housing and the internal body, the injection fluids having a mainly linear flow through the bore in an open position of the device, the movement of the internal body for closing or opening the outlet being operated by pressure differential across the internal body, wherein the longitudinal bore in an opposite end of the orifice is terminated in an internal bottom of the internal body, the internal bottom forming a back pressure surface which is exposed to pressure from injection fluids, the internal body further comprising a pressure surface which is exposed to pressure from process fluid, the pressure surface being opposite the internal bottom, where the pressure difference between the back pressure surface and the pressure surface moves the internal body relative the outer housing.