An adjustable relief valve with automatic calibration

Abstract

The invention discloses an adjustable overflow valve with an automatic calibration function. The adjustable overflow valve comprises a shell. A flow channel is formed in the shell. A plug and a springseat are arranged in the flow channel. A first spring is arranged between the spring seat and the plug. The shell is provided with a conical adjusting portion and an opening provided with a thread. The side of the opening is in threaded connection with an adjusting sleeve. A plurality of slides are arranged on the adjusting sleeve in the radial direction, and the middle of the adjusting sleeve isprovided with an overflow channel communicating with an oil return connector. Adjusting plates are arranged in the slides, a plurality of second springs used for propping the multiple adjusting plates open are arranged between the adjusting plates and the end surfaces of the slides, and bevels matched with the conical adjusting portion are arranged at the front ends of the adjusting plates. A plurality of limiting protruding bars are arranged on the side, close to the flow channel, of each adjusting plate. An elastic ring is arranged on the spring seat. An iron block is arranged on the springseat. The shell is provided with an electromagnet matched with the iron block. According to the overflow valve, the overflow pressure of the overflow valve can be adjusted, the setting pressure can still be maintained though the first spring is shortened and fails, and automatic control over the valve is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of relief valves, in particular to an automatically calibrated adjustable relief valve. Background technique [0002] The relief valve is a hydraulic pressure control valve, which mainly plays the role of constant pressure relief, pressure stabilization, system unloading and safety protection in hydraulic equipment. [0003] When the system pressure exceeds the specified value, the pressure of the high-pressure oil overcomes the spring force in the overflow valve, and part of the high-pressure oil returns to the oil tank through the oil overflow channel of the overflow valve. When the oil pressure is within the safe range, the spring will press the plug on the valve position under the action of its own pre-tightening force, and the overflow valve will be closed. [0004] During long-term use, the spring force of the relief valve will gradually decrease. If the spring force of the relief valve is too small, ...

AI Technical Summary

Problems solved by technology

The overflow reversing valve with this structure has a short service life, and it is troublesome to replace the spring

[0005] The existing overflow valve needs to change the overflow pressure of the overflow valve by changing the compression amount of the compression spring, and the overflow valve adjusted in this way will still shorten and fail after long-term use, and at this time it needs to be reinstalled. Adjustment, short service life, troublesome adjustment

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