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The Trerice Series 91500 Self-Operating Pressure Regulator is extensively used in canning, meat packing and other food processing industries to regulate pressure cookers, retorts and other devices. The 91500 requires that a user-supplied pressure sensing line be connected from the downstream controlled point to the regulator’s actuator. Pressure in this line acts upon the bellows to develop the necessary thrust to stroke the valve. As the downstream pressure increases, the valve closes, thereby reducing the downstream pressure.