| 摘要 |
FIELD: mining, particularly hydraulic systems of mine support sections. ^ SUBSTANCE: unit comprises at least one switch assembly having delivery channel, discharge channel and target orifices of two target valve assembly switches built in the body. Each valve assembly includes spring-loaded delivery valve, which periodically communicates target orifice with delivery channel and discharge channel and discharge valve with working end surface, which periodically communicates address orifice with discharge channel by displacement thereof. The unit also comprises communicating panel with channels to connect delivery and discharge channels of one or several switches with delivery and discharge channels of supply block. The supply block has sockets adapted to be connected to delivery and discharge pipelines. Target valve assemblies include delivery valve axially aligned with address orifice, radial orifices and discharge valve, which may close delivery valve end and move towards address orifice by working end surface. Delivery valve is made as hollow cylinder provided with annular working surface located in delivery valve center. The annular working surface contacts seat. Discharge valve is made as piston displaced by pressure change via inner channels through corresponding control valve built in switch body and connected to delivery and discharge channels. Each switch has rectangular shape and threaded orifices to provide switch usage in modular hydraulic units. ^ EFFECT: increased operational efficiency, reduced repair time, simplified structure, possibility of unit application in automated support control systems. ^ 3 cl, 11 dwg |
