45results about How to "Stable pressure relief" patented technology

The invention discloses a hydraulic system for telescopic buffer of a crane boom and a crane. The hydraulic system for telescopic buffer of the crane boom comprises a telescopic oil cylinder, a main valve and a balance valve, wherein a first working oil port and a second working oil port of the main valve are respectively connected to a rod chamber of the telescopic oil cylinder and a free oil inlet of the balance valve in a communication way, a free oil outlet of the balance valve is connected to a rodless chamber of the telescopic oil cylinder in a communication way, and the first working oil port is also connected to a control oil port of the balance valve in a communication way through a control oil line; and the hydraulic system for telescopic buffer of the crane boom also comprises an auxiliary pressure-relief oil line, a through flow damper and a hydraulic control pressure-relief on-off valve, wherein the oil inlet end of the auxiliary pressure-relief oil line is connected to the rodless chamber of the telescopic oil cylinder in a communication way, the through flow damper and the hydraulic control pressure-relief on-off valve are arranged on the auxiliary pressure-relief oil line, and the control oil port of the hydraulic control pressure-relief on-off valve is connected to the control oil line or the first working oil port in a communication way. By implementing the hydraulic system, impact generated by the balance valve or a pressure shunting damper when the crane boom is started to be shrunk can be effectively reduced.

The invention provides a servo quick forging valve and a servo valve system and relates to the field of quick forging hydraulic machines, in particular to the servo quick forging valve. The servo quick forging valve comprises a servo motor, a support, a guiding lubricating cover plate and a valve sleeve which are sequentially arranged from left to right, a ball screw assembly is installed in the centers of the support, the guiding lubricating cover plate and the valve sleeve in a penetrating mode, and an output shaft of the servo motor is connected with a lead screw of the ball screw assembly in a threaded mode; the guiding lubricating cover plate and the end face of the valve sleeve are tightly matched in a sealed mode and connected into an integrated structure, a servo valve core is installed in the valve sleeve, and the servo valve core and a bearing bolt of the ball screw assembly are connected to into an integrated structure; and a bearing of the ball screw assembly can be driven by the lead screw to vertically move to adjust opening and closing of a valve. The invention further relates to the servo valve system. The servo valve system comprises the servo quick forging valve and a programmable logic controller. Through the technical scheme of the servo quick forging valve and the servo valve system, the oil swapping phenomenon occurring in an existing servo quick forging valve is avoided.

The invention discloses an ultrahigh-pressure fully-automatic pressure relief device. The ultrahigh-pressure fully-automatic pressure relief device comprises a main body and a step motor positioned at the right side of the main body, wherein the main body comprises a pressure relief cavity which is through in two sides; the pressure relief cavity comprises a sealing cavity at the left side, a regulating cavity on the middle and a threaded cavity at the right side, wherein a screw plug I at the left side and a valve seat at the right side are arranged in the sealing cavity; an ejector pin which is thin in left portion and thick in right portion is arranged in the regulating cavity; the left end of the ejector pin is equipped with a tip which extends into a valve hole; the threaded cavity is internally matched with a screw; the left end of the screw is bumped, and abuts against the right end of the ejector pin; the right end of the screw is equipped with a shaft hole with a key slot; the shaft hole is in clearance fit with a motor shaft of the step motor through a flat key; the lower end of the main body is equipped with an oil inlet which is fixedly equipped with an oil inlet nozzle; and the oil inlet communicates with a first oil inlet hole path. According to the ultrahigh-pressure fully-automatic pressure relief device disclosed by the invention, the step motor is adopted to drive the screw to regulate movement of the ejector pin, so that the tip is regulated to extend into the valve opening by certain length, and therefore, linear pressure relief is realized, linear changes of system pressure are realized, and a production process curve is met.

The invention discloses a device for automatically balancing tire pressure in the running process of an automobile. The device comprises two air chambers which are respectively arranged at the two ends of the axle of the automobile, can be connected through a valve for balancing the pressure difference of the two air chambers, and are respectively communicated with air cavities of adjacent tires. The device for automatically balancing the tire pressure in the running process of the automobile has the advantages of simple structure, low cost, high safety and reliability and convenience in popularization and application.

The invention provides an automobile engine oil pump which comprises a pump bonnet and a pump body, wherein a high-pressure oil cavity and a low-pressure oil cavity are arranged in the pump body; the pump bonnet is provided with a dual-purpose valve; the dual-purpose valve comprises a valve body; an oil return cavity, a valve cavity and a valve core are arranged in the valve body; the oil return cavity is positioned at the upper part of the valve cavity; the valve core is installed in the valve cavity and isolates the oil return cavity from the valve cavity; the valve cavity is communicated with the high-pressure oil cavity; the valve core is provided with a first end face and a second end face; the first end face is contacted with the oil return cavity and bears the downward acting forceof the oil in the oil return cavity; the second end face is contacted with the valve cavity and bears the downward acting force of the oil in the valve cavity; the area of the first end face is smaller than that of the second end face; and the position on which the dual-purpose valve is arranged on the pump bonnet is provided with a pressure relief port which is communicated with a low-pressure oil cavity. The oil pump can relieve pressure at the time of cold starting of an engine and can also steadily relieve pressure when the engine normally operates, so that the arrangement space of the oil pump is small.