A polymerization process comprising: circulating, with a pump , a reaction mixture slurry in a polymerization loop reactor during a polymerization process, wherein the reaction mixture slurry comprises an olefin, a catalyst, and polymer particles; detecting a pressure change in the reaction mixture slurry downstream of the pump ; generating, by a pressure controller , a continuous takeoff valve actuation signal for a continuous takeoff valve based on the pressure change, wherein a portion of the reaction mixture slurry is continually removed from the polymerization reactor in proportion to the continuous takeoff valve position, and wherein the reaction mixture slurry is retained in the polymerization reactor when the continuous takeoff valve is in a closed position, wherein the reactor pressure is based on the continuous takeoff valve position; generating, by the pressure controller , a correction to the continuous takeoff valve actuation signal; generating, by the pressure controller , a time delay for the correction, wherein the time delay is based on the time for the reaction mixture to flow from the pump to the continuous takeoff valve in the polymerization reactor , the time delay calculated by multiplying the total circulation time for the slurry to traverse through the polymerization reactor by a ratio of the flowpath distance from the pump to the takeoff valve ; applying the correction to the continuous takeoff valve actuation signal to generate a corrected continuous takeoff valve actuation signal of reduced magnitude; providing the corrected continuous takeoff valve actuation signal to the continuous takeoff valve after the time delay; and adjusting a position of the continuous takeoff valve in response to providing the corrected continuous takeoff valve actuation signal. circulating, with a pump , a reaction mixture slurry in a polymerization loop reactor during a polymerization process, wherein the reaction mixture slurry comprises an olefin, a catalyst, and polymer particles; detecting a pressure change in the reaction mixture slurry downstream of the pump ; generating, by a pressure controller , a continuous takeoff valve actuation signal for a continuous takeoff valve based on the pressure change, wherein a portion of the reaction mixture slurry is continually removed from the polymerization reactor in proportion to the continuous takeoff valve position, and wherein the reaction mixture slurry is retained in the polymerization reactor when the continuous takeoff valve is in a closed position, wherein the reactor pressure is based on the continuous takeoff valve position; generating, by the pressure controller , a correction to the continuous takeoff valve actuation signal; generating, by the pressure controller , a time delay for the correction, wherein the time delay is based on the time for the reaction mixture to flow from the pump to the continuous takeoff valve in the polymerization reactor , the time delay calculated by multiplying the total circulation time for the slurry to traverse through the polymerization reactor by a ratio of the flowpath distance from the pump to the takeoff valve ; applying the correction to the continuous takeoff valve actuation signal to generate a corrected continuous takeoff valve actuation signal of reduced magnitude; providing the corrected continuous takeoff valve actuation signal to the continuous takeoff valve after the time delay; and adjusting a position of the continuous takeoff valve in response to providing the corrected continuous takeoff valve actuation signal. <EOS>