Ratio pressure difference control valve
A control valve and differential pressure technology, applied in the field of hydraulic control valve, can solve the problems of complicated system, large resistance and high cost
Inactive Publication Date: 2007-02-14
NINGBO HOYEA MACHINERY MFG
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Problems solved by technology
However, in actual use, it is found that when the control slide valve is used in the occasion of large flow control, due to the limitation of the orifice diameter, its flow rate is small, which cannot meet the requirements of this large flow control; in addition, when it is used as a When an independent on-off valve is used for differential pressure control, such as a single-acting oil cylinder used to control the valve of an internal combustion engine, similarly, due to the limitation of the diameter of the damping hole, the return speed of the oil cylinder piston is slow and the resistance is large, so that it must be in the first main An auxiliary valve, such as a hydraulic control check valve, is added between the oil port and the second main oil port to help the piston return faster, but this often makes the system complicated and costly, so when it needs to be used in such occasions, Above-mentioned pilot control spool valve still needs further improvement
Method used
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[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0012] Such as figure 1 As shown, the proportional differential pressure control valve includes a valve body 1, a valve core 2 with a shoulder 21 in the middle, a proportional solenoid (not shown in the figure), and the first main oil port A and the second main oil port A on the valve body 1. Oil port B and oil drain port T, the valve body 1 is provided with a horizontally arranged transverse channel 11 matching the valve core 2, the right end of the valve core 2 is offset against the ejector rod 4 of the proportional electromagnet, and The left end of the spool is in contact with one end of a spring 3, the other end of the spring 2 is in contact with the spring seat, and the spring seat is in sealing connection with the valve body 1, so that the spool 2 always has a tendency to move to the electromagnet side, and at the same time makes it wor...
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The proportional pressure difference control valve is improved on the basis of available valve with valve body with the first oil outlet, the second oil outlet and oil relief port, valve core with middle ledge and proportional electromagnet and has also lower left channel, the first throttle side and the second throttle side. The proportional pressure difference control valve has normally opened first throttle side and normally closed second throttle side. With the motion of the valve core inside the transverse channel the valve in the said structure will form one variable damping hole corresponding to the electromagnet signal between the ridge and the transverse channel port and with aperture greatly than that of fixed damping hole. Therefore, the present invention has greatly increased flow rate and is used in where great flow rate control or precursor control is needed.
Description
technical field [0001] The invention relates to a hydraulic control valve, in particular to a proportional differential pressure control valve suitable for pilot control of an electro-hydraulic proportional flow valve or directly used for decompression in a hydraulic system to obtain secondary pressure. Background technique [0002] In hydraulic transmission and control, it is used as the pilot stage of proportional pressure flow valve, proportional flow valve and proportional directional flow valve. Generally, electro-hydraulic proportional pressure reducing valve or pilot control slide valve with fixed damping hole is used. For example, the publication number is CN1337539A The Chinese invention patent application "Pressure Differential Feedback Pilot Control Spool Valve" discloses such a design scheme. The control spool valve includes a valve body, a spool, a proportional solenoid and the first main oil on the valve body. port, the second main oil port and the oil drain po...
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IPC IPC(8): F16K17/10F16K11/07F15B13/00F16K31/02
Inventor 凌俊杰翁振涛
Owner NINGBO HOYEA MACHINERY MFG