Circuit selection valve with pressure relief function

Abstract

The invention provides a circuit selection valve with a pressure relief function. A valve hole is formed in a valve body, and a left pressure relief chamber and a right pressure relief chamber are formed in the valve hole. A first oil port, a second oil port, a third oil port, a fourth oil port, a fifth oil port and sixth oil port are formed in the valve body. The left pressure relief chamber is connected with the second oil port through a first one-way valve, and the right pressure relief chamber is connected with the fifth oil port through a second one-way valve. A valve element is arrangedin the valve hole in a mode of moving left and right, and a flowing hole, a first pressure relief hole, a second pressure relief hole, a third pressure relief hole and a fourth pressure relief hole are formed in the valve element. A left end cover is detachably arranged on the valve body and is used for closing the left end of the valve hole. The left end of an elastic piece is butted against theright end of the left end cover, and the right end of the elastic piece is butted against the left end of the valve element. An electromagnet is detachably arranged on the valve body and is used for closing the right end of the valve hole, and the left of the push rod of the electromagnet directly faces to the right end of the valve element. The circuit selection valve has the advantages of simplestructure, low cost and convenience in mounting.

Description

technical field [0001] The invention relates to a valve, in particular to a circuit selection valve with pressure relief function. Background technique [0002] In modern industrial hydraulic and mobile machinery hydraulic oil circuits, a large number of identical actuators (hydraulic cylinders or hydraulic motors) are used in parallel and sequentially acting oil circuits. Such as Figure 5 As shown, in the existing hydraulic system, the corresponding number of electro-hydraulic proportional multi-way valves is generally selected according to the number of actuators to control the actuators. The disadvantages in the existing oil circuit are: (1) the price of each electro-hydraulic proportional multi-way valve is expensive, the market price is 3,000-4,000 yuan, and there is cost pressure on mechanical equipment with low price; (2) Each electro-hydraulic proportional valve must be equipped with an amplifier or controller, and the selection of multiple electro-hydraulic propor...

AI Technical Summary

Problems solved by technology

The disadvantages in the existing oil circuit are: (1) the price of each electro-hydraulic proportional multi-way valve is expensive, the market price is 3000-4000 yuan, and there is cost pressure for mechanical equipment with low price; Each electro-hydraulic proportional valve must be equipped with an amplifier or controller, and the selection of multiple electro-hydraulic proportional valves also increases the cost of electronic control and the complexity of the system

[0003] In order to solve the above problems, circuit selection valves have appeared on the existing market, such as Figure 4 As shown, only one piece of electro-hydraulic proportional valve can be used in the hydraulic circuit, and which oil cylinder to control is selected through the control of the circuit selection valve. The existing circuit selection valve can well replace the expensive electro-hydraulic proportional valve and reduce the electric The cost of the control system; but this circuit selection valve cannot be used in hydraulic circuits containing hydraulic locks or balance valves, because the four working oil ports of the existing circuit selection valve are cut-off when they are in non-working state, and do not have The unloading function will cause the delayed closing of the hydraulic lock and the balance valve, which will cause the excessive slide of the actuator

Images