Overload overflowing valve for integral multi-way valve
A multi-way valve and relief valve technology, applied in the field of hydraulic valves, can solve the problems of system insecurity, roughness, vibration, etc., and achieve the effect of ensuring system safety
Inactive Publication Date: 2015-12-30
GUIZHOU FENGYANG HYDRAULIC
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Problems solved by technology
At present, the overload relief valve used in the main control valve of the excavator opens and closes directly and roughly, which is likely to cause noise and vibration; and it only has the function of overload relief, without the function of under-pressure oil replenishment, and the system is not safe.
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[0009] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0010] Such as figure 1 As shown: there is a valve cavity in the valve body 4, and the right end of the valve cavity is a high-pressure oil port 12 connected with the integral multi-way valve (not shown in the figure); the valve seat 18 with a valve hole is fixed in the valve cavity , the valve seat divides the valve chamber into a left chamber and a right chamber. There is a valve 9 in the right cavity, and an outer spring 8 is arranged between the valve and the valve seat 18; the left cavity is sealed by a valve sleeve 4 fixed on the valve body 19, and there is a low-pressure chamber 20 inside the valve sleeve. The low-pressure chamber has a pressure-regulating spring 5 that tightens the valve core 6 in the valve hole; the valve body 19 has a first low-pressure oil port 10 communicating with the low-pressure chamber 20 . There is a slide rod 14 i...
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The invention discloses an overload overflowing valve for an integral multi-way valve, belongs to hydraulic valves and aims at providing an overflow buffering and under-pressure oil supplementing type overload overflowing valve. The overload overflowing valve comprises a valve body; a valve base fixed in a valve cavity is used for separating the valve cavity into a left cavity and a right cavity; the right cavity is internally provided with a movable door; an outer spring is arranged between the movable door and the valve base; a valve sleeve with a low-pressure cavity is fixed on the valve body and is used for sealing the left cavity; the low-pressure cavity is internally provided with a pressure adjusting spring for tightly ejecting a valve element in a valve hole; the valve body is provided with a high-pressure oil hole and a second low-pressure oil hole; the second low-pressure oil hole is communicated with the low-pressure cavity; the movable door (9) is internally provided with a slide rod (14); the slide rod is provided with a first damping hole (15) for communicating the right cavity (17) with the high-pressure oil hole (12); and an inner spring (7) is arranged between the valve base (18) and the slide rod (14). With the adoption of the overload overflowing valve, damping overflow can be realized and the stability can be guaranteed; the overload overflowing valve also has a negative-pressure oil supplementing effect and the system security is guaranteed; and the overload overflowing valve for the integral multi-way valve, disclosed by the invention, is used for an excavator.
Description
technical field [0001] The invention relates to a hydraulic valve, in particular to an overload relief valve for an integral multi-way valve. Background technique [0002] The overload relief valve is an important component of the main control element of construction machinery such as excavators - the integral multi-way valve. It is mainly used to control the maximum pressure of each hydraulic branch of the excavator, or to play the role of high-pressure relief or oil replenishment when the actuator stops. . At present, the overload relief valve used in the main control valve of the excavator is opened and closed directly and roughly, which is likely to cause noise and vibration; and it only has the function of overload relief and does not have the function of oil replenishment under pressure, so the system is not safe. Contents of the invention [0003] In view of the above-mentioned defects in the prior art, the present invention aims to provide an overload relief valve...
Claims
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Inventor 宋天宇杨鹏
Owner GUIZHOU FENGYANG HYDRAULIC