Introduction ZD series brakes, innovative design, unique structure, accelerate hydropower unit is suitable for parking brake, hydroelectric industry is an indispensable auxiliary equipment, divided into horizontal and vertical two series. Hydro group (commonly known as the damper) is an important part of the unit with a mechanical braking system brakes, brake systems unit by the brake, oil wind pipe, manual and automatic control device. In the form of structural brake is varied, a single dual-chamber gas piston reset structure, a double piston single-chamber structure from repeated reset, reset a double piston dual chamber air structure, there are three oil and gas separation gas piston reset three-chamber structure, etc., each kind of structure in the form of brake performance indicators have different emphases, for vertical units and horizontal units, flow unit /, storage units, etc., for the protection of the safe operation of the unit, the selection is particularly important brake structure vertical water wheel Mixed with brake and gas turbines, gas reversion, vertically mounted brake ZD-L - *** - Q fuel mixture, weight or spring return, vertically mounted brake ZD-L - *** - FT oil and gas separation, gas reversion brake ZD-L *** vertical installation - QF bulb tubular hydro-generating unit with dual-chamber single-piston brakes, air return, vertical horizontal installed brake ZD-L (w) - *** - QD double dual-chamber piston, gas reversion, vertical horizontal installed brake ZD-L (w) - *** - QS horizontal hydro-generating unit with brake air brake, return, horizontally mounted brake ZD-W - ** * -Q hydraulic brake, return, horizontally mounted brake ZD-W - *** - Y