Thread cartridge balanced valve

Abstract

The invention relates to a thread cartridge balanced valve which is applicable to a working condition with a mutative load and especially engineering machinery which requires load downlink controlling and makes an effect on balancing the load gravity and the load speed. The thread cartridge balanced valve comprises a valve body and a valve core, wherein the valve core is connected with the valve body through a spring set composed of a plurality of springs which are embedded with each other by screwing leftwards and rightwards respectively and have different rigidity to form a multi-load sensitive entirety. The valve core integrates the functions of the existing main valve core and the existing pilot valve core; the reaction speeds are completely consistent so that load is more stable during the descending process and no low-frequency shaking phenomenon occurs, thus guaranteeing the safe reliability of a system; and when a hose decompresses, the main valve core can automatically and rapidly close an oil channel between a main oil port B and a main oil port A, prevent the stall speed of the load from descending, and serve as a hydraulic lock.

Description

technical field [0001] The invention relates to a hydraulic balance valve, in particular to a threaded plug-in balance valve, which belongs to the technical field of hydraulic transmission. Background technique [0002] In modern large, medium and small hydraulic systems, various hydraulic balance valves or valve bodies with balance valve functions are widely used. The existing hydraulic balance valve is mainly composed of control valve and main valve. There are two common types in construction machinery: single-stage and pilot-operated. The single-stage main valve and control valve are connected in parallel, and the pilot-operated main valve and control valve are Nested connection, but the above-mentioned two kinds of hydraulic balance valves have a common disadvantage in terms of performance. When the hydraulic load-bearing system is descending under load, it is difficult for the spool opening of the balance valve to be stabilized at a certain opening size, which makes the...

AI Technical Summary

Problems solved by technology

The existing hydraulic balance valve is mainly composed of control valve and main valve. There are two common types in construction machinery: single-stage and pilot-operated. The single-stage main valve and control valve are connected in parallel, and the pilot-operated main valve and control valve are Nested connection, but the above-mentioned two kinds of hydraulic balance valves have a common disadvantage in terms of performance. When the hydraulic load-bearing system is descending under load, it is difficult for the spool opening of the balance valve to be stabilized at a certain opening size, which makes the load occur during the descent. The phenomenon of low-frequency jitter causes the system to be extremely unstable and seriously affects the safety and reliability of the whole machine

In addition, the existing balance valves are generally installed and connected by integral valve blocks. The problem is that the corresponding connection sizes are different and there are various structural forms of valve blocks, which is inconvenient for design and promotion.

Therefore, the use of the integral valve block installation structure can no longer meet the requirements. Adding new functions will inevitably cause the volume of the valve block to increase, which will undoubtedly increase the cost of the valve block and limit the installation space.

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