HYDRAULIC DEVICE OF PRESSURE REDUCING TYPE FOR RIVER OUTLET VALVE OF MULTIPURPOSE DAM

摘要

PURPOSE: An excessive rising of pressure in a hollow jet valve is prevented to prevent leakage of a v-packing and water pollution. CONSTITUTION: A hydraulic device for river outlet valve is composed of hydraulic cylinders(c1,c2) to open/shut guard gate valve(v3) and a hollow jet valve(v4). A relieve valve(R) and a pressure switch(S) are formed in a closed side pipe(P2) of the hollow jet valve. The relief valve is opened in a high pressure to reduce pressue. The pressue switch senses a low pressure to operate a hydraulic pump by a controller, and to switch a direction switching valve to a closed state.