Dual-pipeline hydraulic safety valve

Abstract

The invention discloses a dual-pipeline hydraulic safety valve comprising a valve body, a left valve core component, a right valve core component and a piston. The valve body is provided with a pressure fluid inlet, a left pressure fluid outlet, a right pressure fluid outlet and a through passage, and the left and right pressure fluid outlets are connected to two ends of the through passage and communicated with the pressure fluid inlet through the through passage. The left and right valve core components are both mounted in the through passage so as to turn on or off communication between the left and right pressure fluid outlets and the pressure fluid inlet. The piston is disposed between the left valve core component and the right valve core component, a left valve core passage and a right valve core passage are formed in the left valve core component and the right valve core component respectively, one ends of the two passages are communicated with the left pressure fluid outlet and the right pressure fluid outlet respectively, and the other ends of the two passages are both communicated with the piston. By the aid of the dual-pipeline hydraulic safety valve, when a single oil source supplies oil to dual pipelines, after pressure is lowered to a set value due to fault of one pipeline, oil supply to the faulted pipeline is stopped automatically, and the other pipeline is still kept in a normal working state.

Description

technical field [0001] The invention relates to a safety valve, in particular to a double-pipeline hydraulic safety valve. Background technique [0002] In the hydraulic system, the hydraulic system that supplies oil from a single oil source to two channels is widely used, such as the dual hydraulic cylinders of the construction machinery operating device to drive the operating device at the same time, the dual hydraulic cylinder hydraulic clamping device, the dual pipeline hydraulic brake device, etc. . In these hydraulic circuits, once the failure of one of the hydraulic circuits occurs due to pipeline rupture, damage to the connecting device, damage to the seal, etc., the pressure of the entire system drops rapidly, causing the pressure of the other circuit to decrease at the same time and cannot work normally. The method currently used is: 1. Install a check valve on the two output oil circuits, and increase the opening pressure of the check valve to make it play the ro...

AI Technical Summary

Problems solved by technology

In these hydraulic circuits, once one of them fails due to pipeline rupture, damage to the connecting device, damage to the seal, etc., the pressure of the entire system drops rapidly, causing the pressure of the other circuit to decrease at the same time and cannot work normally.

The method currently used is: 1. Install a check valve on the two output oil circuits, and increase the opening pressure of the check valve to make it play the role of a sequence valve in the system. Inconsistencies and high traffic loss

2. The slide valve core structure is adopted, and the two-way output pressure directly controls the direction of the slide valve to close the fault end. However, it has problems such as complex structure, poor sealing performance and low corresponding speed.

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