Overflow valve with pressure regulating and safety functions

A safety function and relief valve technology, applied in the field of hydraulic control valves, can solve the problems of damaged hydraulic components, enlarged hydraulic system structure, abnormal system operation, etc., to achieve the effect of increasing stability and preventing clamping

Active Publication Date: 2016-04-27
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As in a hydraulic system, due to the closeness between the adjusted pressure and the maximum pressure, the double relief valve is prone to resonance, which will cause the system to work abnormally and even damage the hydraulic components.
If the double relief valve is arranged far away, resonance can be avoided, but the structural size of the hydraulic system will become larger, increasing the difficulty of piping layout or valve block design

Method used

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  • Overflow valve with pressure regulating and safety functions
  • Overflow valve with pressure regulating and safety functions
  • Overflow valve with pressure regulating and safety functions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, a relief valve with pressure regulation and safety functions described in the embodiment of the present invention can be divided into three working processes: a pressure stabilization process, a safety process and an emergency process.

[0027] Pressure stabilization process: The fluid enters the main valve cavity from the liquid inlet P, enters the flow channel 4 on the upper side of the main valve core 3 through the damping hole Ia, and acts on the pilot valve core 7, and at the same time, the fluid flows into the center hole through the peripheral hole Ib In c, the emergency pin 8 acts on the emergency pin 8 through the drainage hole 9. At this time, the notch 81 on the emergency pin 8 is closed, and the drainage hole 9 and the liquid outlet IIT 2 Not connected. When the fluid pressure on the upper side of the main spool 3 is lower than the opening pressure of the pilot valve, the pilot spool 7 is c...

Embodiment 2

[0031] Such as figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, a relief valve with pressure regulation and safety functions described in the embodiment of the present invention has a working process similar to that of embodiment 1. A safety valve is added to the valve body 1, and a damping hole is opened on the safety valve core 12. II13. In the safety process, compared with the first solution, the safety valve core 12 in the second solution will be opened, so that the fluid flows from the liquid outlet IIIT 3 The outflow increases the overflow volume, and the safety protection performance is reliable.

Embodiment 3

[0033] Such as image 3 , Figure 4 , Figure 5 and Figure 6 As shown, the relief valve with pressure regulation and safety functions described in the embodiment of the present invention has a working process similar to that of embodiment 1, and can limit the working states of the two-way actuators. When one of the actuators controlled by the P port works normally, the P 1 The executive components of the port control also work normally. When the system pressure controlled by port P exceeds the safety pressure, the spool 3 moves up to release the two control pressures at the same time.

[0034]In summary, the present invention discloses a relief valve with pressure regulation and safety functions, and establishes a coordination mechanism between the two functions of pressure regulation and pressure limitation. Compared with the combination of traditional double relief valves, there are five Advantages: First, the spool spring of the safety limiting pressure is relatively ...

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PUM

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Abstract

The invention discloses an overflow valve with pressure regulating and safety functions, and relates to the technical field of hydraulic control valves. The overflow valve comprises a valve body, a main valve, a pilot valve and an emergency pin; the valve body is provided with a runner, a drainage hole, a liquid inlet, a first liquid outlet and a second liquid outlet; one side of the main valve is communicated with the liquid inlet, the other side of the main valve is connected with the pilot valve through the runner, the lower end of the main valve is communicated with the first liquid outlet, and the upper end of the main valve is communicated with the second liquid outlet through the drainage hole; and the emergency pin is connected with the drainage hole. The problem that resonance is caused by a traditional dual overflow valve is effectively solved; the stability of a main valve element is improved; centering of the main valve element is facilitated, and clamping of the valve element is prevented; the balance of the safety valve element is achieved through hydraulic pressure at the two ends, once the pressure is released from one end, the safety valve element can be rapidly opened, and the pressure of the safety valve element is released; when emergency circumstances occur in a system, one end of a pressure limiting valve element is opened to be subject to pressure releasing by rotating a safety pin, and safety and stability of the pressure of the system are guaranteed.

Description

technical field [0001] The invention relates to the technical field of hydraulic control valves, in particular to an overflow valve with pressure regulating and safety functions. Background technique [0002] With the continuous development of industrial technology, the hydraulic system that drives the actuators of construction machinery tends to be high-pressure and high-flow, which puts forward higher requirements for the pressure control and flow control of the hydraulic system. [0003] In a practical hydraulic system, the relief valve is one of the most important pressure control components in the hydraulic transmission system. Its basic working principle is that when the system pressure reaches or exceeds the set pressure of the relief valve, the valve port opens to allow The liquid overflows, so that the outlet pressure of the system drops to the pressure specified by the overflow valve. In the quantitative pump hydraulic system, the overflow valve mainly plays the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02
Inventor 邓海顺魏本柱王传礼冒鹏飞马丁钟长鸣
Owner ANHUI UNIV OF SCI & TECH
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