ADJUSTABLE RELIEF VALVE Russian patent published in 2003 - IPC

FIELD: lubricating equipment. SUBSTANCE: invention can be used in impulse lubricating systems with batch-operated pressure pumps. Proposed adjustable relief valve includes housing with inlet, outlet and drain channels communicating with space made in housing bore which accommodates stop, cutoff valve unit between outlet and drain channels, and power spring acting onto cutoff valve unit. Stop is made in form of blind rod. Cutoff valve unit has bushing installed in housing bore coaxially with stop for axial displacement. Said bushing has inner conical surface on end far from stop. Piston is installed coaxially inside bushing for axial displacement and is provided with outer conical surface corresponding to inner conical surface of bushing. Power spring is installed from side of stop and it thrust against end face of bushing of cutoff valve unit pointed to stop. Piston of cutoff valve unit can contact in extreme positions with end face of stop and with end face of bore made in housing. Inlet channels communicates with space made in end face of housing bore. Cutoff valve unit piston, in one of extreme positions, can come in contact with end face. Outlet channel communicates with space of bore made in housing between end face of bore made in housing with which piston of cutoff valve unit in one of extreme positions contacts between outlet and drain channels and bushing of cutoff valve unit, and drain channel communicates with bore made in housing from side of stop. EFFECT: increased reliability of device. 3 cl, 1 dwg