This technology involves the field of environmental protection is an applied dedusting system pressure regulator, by adjusting the pipe, flange, wear layers, the adjusting tube welded to the mounting flange, adjusting the tube is provided with an internal resistance wear layers. This technical pressure regulator beneficial effects that: simple structure, easy to use and low cost, is an unwanted electrical or pneumatic control, increasing resistance effect obviously, not leakage, commissioning after installation without pressure regulator.