{"id":2709,"date":"2021-06-09T02:53:05","date_gmt":"2021-06-09T02:53:05","guid":{"rendered":"https:\/\/hqeialdi5a.wpdns.site\/?p=2709"},"modified":"2024-02-01T01:38:06","modified_gmt":"2024-02-01T01:38:06","slug":"3-questions-about-hydraulic-circuit","status":"publish","type":"post","link":"https:\/\/www.yaiwo.com\/vi\/3-questions-about-hydraulic-circuit\/","title":{"rendered":"3 Best Questions About Decompression Hydraulic Circuit"},"content":{"rendered":"

<\/span>Th\u1eddi gian \u0111\u1ecdc \u01b0\u1edbc t\u00ednh: <\/span>8<\/span> ph\u00fat<\/span><\/p>\n\n\n\n

Hydraulic Circuit using a pressure-reducing valve Figure 15 allows a cylinder or stroke in the circuit to operate at a low relief valve set pressure. A pressure-reducing valve with a check valve is designed so that when the piston returns, the oil flow passes through the check valve without passing through the pressure-reducing element. Hydraulic Circuit<\/p>\n\n\n\n

\"Hydraulic
15. M\u1ea1ch gi\u1ea3m \u00e1p s\u1eed d\u1ee5ng van gi\u1ea3m \u00e1p<\/figcaption><\/figure>\n\n\n\n

1. Vi\u1ec7c thi\u1ebft k\u1ebf m\u1ea1ch gi\u1ea3m \u00e1p c\u1ea7n l\u01b0u \u00fd v\u1ea5n \u0111\u1ec1 g\u00ec<\/strong><\/h2>\n\n\n\n
    \n
  • Leakage problem of pilot operated pressure reducing Hydraulic Circuit<\/li>\n<\/ul>\n\n\n\n

    Be aware of the pilot-operated pressure reducing valve leakage than other control valves. The leakage of this valve can be as much as 1L \/ min or more. As long as the valve is in working condition, the leakage is always present. In the choice of hydraulic pump capacity, take this into full consideration.\u00a0It should note that the minimum adjustment pressure of the pressure-reducing valve should ensure that the difference between the primary and the secondary is 0.31MPa. Hydraulic Circuit<\/p>\n\n\n\n

      \n
    • V\u1ea5n \u0111\u1ec1 m\u1ea5t \u1ed5n \u0111\u1ecbnh \u00e1p su\u1ea5t th\u1ee9 c\u1ea5p<\/li>\n<\/ul>\n\n\n\n

      The damping hole of the main spool of the pressure reducing valve is blocked so that the oil exported from the pressure reducing valve cannot flow smoothly into the capacitive cavity between the main valve and the pilot valve. And the pilot valve also reduces the control role of the secondary pressure exported from the pressure reducing valve, resulting in unstable secondary pressure. Hydraulic Circuit<\/p>\n\n\n\n

      2. Decompression Hydraulic Circuit component setting problem<\/strong><\/h2>\n\n\n\n

      As shown in Figure 16, the pressure in the branch circuit cylinder 2 after the pressure-reducing valve 3 is lower than the fluid pressure in the master cylinder 1 branch circuit, which is called a pressure reducing circuit. The problems of this circuit are as follows. Hydraulic Circuit<\/p>\n\n\n\n

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      • When cylinder 2 is stopped for a long time, the secondary pressure after pressure reducing valve 3 gradually increases. This is because when cylinder 2 is stopped for a long time, a small amount of oil is discharged through the pilot valve through the spool gap to keep the valve in working condition. Due to the leakage in the valve, the flow through the pilot valve increases, and the secondary pressure (outlet pressure) of the pressure-reducing valve increases. To prevent this failure, you can add the oil circuit shown in the dashed line in the pressure reducing circuit, and install a safety valve at b to ensure that the pressure reducing valve outlet pressure does not exceed its adjustment Hydraulic Circuit.<\/li>\n<\/ul>\n\n\n\n
        \"1-Master
        16. 1-Xi lanh ch\u1ee7; 2-Nh\u00e1nh xi lanh; 3-Van gi\u1ea3m t\u1ed1c; Van ti\u1ebft l\u01b0u 4-A<\/figcaption><\/figure>\n\n\n\n
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        • The speed adjustment of the hydraulic cylinder in the pressure reducing circuit is not working or the speed is not stable. As shown in Figure 16, this problem occurs when the leakage of pressure-reducing valve 3 (the fluid flowing back to the tank from the pressure-reducing valve drain port) is large. The solution is to change the throttle valve from the position in the figure to\u00a0connected in series at an after the pressure reducing valve, to avoid the effect of pressure reducing valve leakage on the speed of cylinder 2. Hydraulic Circuit<\/li>\n<\/ul>\n\n\n\n

          3. \u00c1p su\u1ea5t l\u00e0m vi\u1ec7c kh\u00f4ng \u1ed5n \u0111\u1ecbnh c\u1ee7a m\u1ea1ch gi\u1ea3m \u00e1p<\/strong><\/h2>\n\n\n\n

          In the system shown in Figure 17, the hydraulic pump is quantitative, and the hydraulic cylinders 7 and 8 in the main oil circuit are controlled by two-position four-way electro-hydraulic reversing valves 5 and 6 respectively to control the direction of motion, and the control fluid of the electro-hydraulic reversing valves comes from main oil Hydraulic Circuit.<\/p>\n\n\n\n

          M\u1ea1ch gi\u1ea3m \u00e1p \u0111\u01b0\u1ee3c n\u1ed1i song song v\u1edbi m\u1ea1ch d\u1ea7u ch\u00ednh v\u00e0 \u0111\u01b0\u1ee3c kh\u1eed \u00e1p b\u1eb1ng van gi\u1ea3m \u00e1p 3. Van \u0111i\u1ec7n t\u1eeb hai v\u1ecb tr\u00ed b\u1ed1n chi\u1ec1u \u0111i\u1ec1u khi\u1ec3n h\u01b0\u1edbng chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c 9.<\/p>\n\n\n\n

          The electro-hydraulic reversing valve controls the return line of the oil circuit and the external drain of the pressure reducing valve. The oil circuit merges and return to the tank, and the operating pressure of the system is regulated by the relief valve2. Hydraulic Circuit<\/p>\n\n\n\n

          The main oil circuit in the system works normally, but in the pressure reducing circuit, the pressure downstream of the pressure reducing valve fluctuates greatly, so that the working pressure of hydraulic cylinder 9 cannot be stabilized at the regulated pressure value of 1MPa. Hydraulic Circuit<\/p>\n\n\n\n

          \"Example
          17. V\u00ed d\u1ee5 v\u1ec1 h\u1ec7 th\u1ed1ng c\u00f3 \u00e1p su\u1ea5t kh\u00f4ng \u1ed5n \u0111\u1ecbnh \u1edf \u0111\u1ea7u ra c\u1ee7a van gi\u1ea3m \u00e1p
          1 m\u00e1y b\u01a1m c\u1ed1 \u0111\u1ecbnh; 2 - van x\u1ea3; 3 - van gi\u1ea3m \u00e1p; 4 van \u0111\u1ea3o chi\u1ec1u ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng \u0111i\u1ec7n t\u1eeb hai v\u1ecb tr\u00ed b\u1ed1n chi\u1ec1u; 5,6 - van \u0111\u1ea3o chi\u1ec1u \u0111i\u1ec7n th\u1ee7y l\u1ef1c hai v\u1ecb tr\u00ed b\u1ed1n chi\u1ec1u;
          7 \u0111\u1ebfn 9 - xi lanh th\u1ee7y l\u1ef1c; 10 - \u0111\u1ed3ng h\u1ed3 \u00e1p su\u1ea5t<\/figcaption><\/figure>\n\n\n\n

          In the pressure reducing circuit, the downstream pressure of the pressure reducing valve,\u00a0the working pressure of the pressure reducing circuit, occurs in large fluctuations is a frequent failure phenomenon, the main reasons for which are the following. Hydraulic Circuit<\/p>\n\n\n\n