20V2A 叶片泵
20V2A-1A22R
20V2A-1B22R
20V2A-1C22R
20V2A-1D22R
20V3A
20V3A-1A22R
20V3A-1B22R
20V3A-1C22R
20V3A-1D22R
20V4A
20V4A-1A22R
20V4A-1B22R
20V4A-1C22R
20V4A-1D22R
20V5A
20V5A-1A22R
20V5A-1B22R
20V5A-1C22R
20V5A-1D22R
20V6A
20V6A-1A22R
20V6A-1B22R
20V6A-1C22R
20V6A-1D22R
20V7A
20V7A-1A22R
20V7A-1B22R
20V7A-1C22R
20V7A-1D22R
20V8A
20V8A-1A22R
20V8A-1B22R
20V8A-1C22R
20V8A-1D22R
20V9A
20V9A-1A22R
20V9A-1B22R
20V9A-1C22R
20V9A-1D22R
20V10A
20V10A-1A22R
20V10A-1B22R
20V10A-1C22R
20V10A-1D22R
20V11A
20V11A-1A22R
20V11A-1B22R
20V11A-1C22R
20V11A-1D22R
20V12A
20V12A-1A22R
20V12A-1B22R
20V12A-1C22R
20V12A-1D22R
20V14A
20V14A-1A22R
20V14A-1B22R
20V14A-1C22R
20V14A-1D22R
25V10A
25V10A-1A22R
25V10A-1B22R
25V10A-1C22R
25V10A-1D22R
25V12A
25V12A-1A22R
25V12A-1B22R
25V12A-1C22R
25V12A-1D22R
25V14A
25V14A-1A22R
25V14A-1B22R
25V14A-1C22R
25V14A-1D22R
25V15A
25V15A-1A22R
25V15A-1B22R
25V15A-1C22R
25V15A-1D22R
25V17A
25V17A-1A22R
25V17A-1B22R
25V17A-1C22R
25V17A-1D22R
25V19A
25V19A-1A22R
25V19A-1B22R
25V19A-1C22R
25V19A-1D22R
25V21A
25V21A-1A22R
25V21A-1B22R
25V21A-1C22R
25V21A-1D22R
35V21A
35V21A-1A22R
35V21A-1B22R
35V21A-1C22R
35V21A-1D22R
35V25A
35V25A-1A22R
35V25A-1B22R
35V25A-1C22R
35V25A-1D22R
35V30A
35V30A-1A22R
35V30A-1B22R
35V30A-1C22R
35V30A-1D22R
35V32A
35V32A-1A22R
35V32A-1B22R
35V32A-1C22R
35V32A-1D22R
35V35A
35V35A-1A22R
35V35A-1B22R
35V35A-1C22R
35V35A-1D22R
35V38A
35V38A-1A22R
35V38A-1B22R
35V38A-1C22R
35V38A-1D22R
45V42A
45V42A-1A22R
45V42A-1B22R
45V42A-1C22R
45V42A-1D22R
45V45A
45V45A-1A22R
45V45A-1B22R
45V45A-1C22R
45V45A-1D22R
45V50A
45V50A-1A22R
45V50A-1B22R
45V50A-1C22R
45V50A-1D22R
45V57A
45V57A-1A22R
45V57A-1B22R
45V57A-1C22R
45V57A-1D22R
45V60A
45V60A-1A22R
45V60A-1B22R
45V60A-1C22R
45V60A-1D22R
45V66A
45V66A-1A22R
45V66A-1B22R
45V66A-1C22R
45V66A-1D22R
45V76A
45V76A-1A22R
45V76A-1B22R
45V76A-1C22R
45V76A-1D22R
2520V双联
3525V双联
20V2A-86A22R
20V2A-86B22R
20V2A-86C22R
20V2A-86D22R
4535V双联
20V3A-86A22R
20V3A-86B22R
20V3A-86C22R
20V3A-86D22R
20V4A-86A22R
20V4A-86B22R
20V4A-86C22R
20V4A-86D22R
20V5A-86A22R
20V5A-86B22R
20V5A-86C22R
20V5A-86D22R
20V6A-86A22R
20V6A-86B22R
20V6A-86C22R
20V6A-86D22R
20V7A-86A22R
20V7A-86B22R
20V7A-86C22R
20V7A-86D22R
20V8A-86A22R
20V8A-86B22R
20V8A-86C22R
20V8A-86D22R
20V9A-86A22R
20V9A-86B22R
20V9A-86C22R
20V9A-86D22R
20V10A-86A22R
20V10A-86B22R
20V10A-86C22R
20V10A-86D22R
20V11A-86A22R
20V11A-86B22R
20V11A-86C22R
20V11A-86D22R
20V12A-86A22R
20V12A-86B22R
20V12A-86C22R
20V12A-86D22R
20V14A-86A22R
20V14A-86B22R
20V14A-86C22R
20V14A-86D22R
25V10A-86A22R
25V10A-86B22R
25V10A-86C22R
25V10A-86D22R
25V12A-86A22R
25V12A-86B22R
25V12A-86C22R
25V12A-86D22R
25V14A-86A22R
25V14A-86B22R
25V14A-86C22R
25V14A-86D22R
25V15A-86A22R
25V15A-86B22R
25V15A-86C22R
25V15A-86D22R
25V17A-86A22R
25V17A-86B22R
25V17A-86C22R
25V17A-86D22R
25V19A-86A22R
25V19A-86B22R
25V19A-86C22R
25V19A-86D22R
25V21A-86A22R
25V21A-86B22R
25V21A-86C22R
25V21A-86D22R
35V21A-86A22R
35V21A-86B22R
35V21A-86C22R
35V21A-86D22R
35V25A-86A22R
35V25A-86B22R
35V25A-86C22R
35V25A-86D22R
35V30A-86A22R
35V30A-86B22R
35V30A-86C22R
35V30A-86D22R
35V32A-86A22R
35V32A-86B22R
35V32A-86C22R
35V32A-86D22R
35V35A-86A22R
35V35A-86B22R
35V35A-86C22R
35V35A-86D22R
35V38A-86A22R
35V38A-86B22R
35V38A-86C22R
35V38A-86D22R
45V42A-86A22R
45V42A-86B22R
45V42A-86C22R
45V42A-86D22R
45V45A-86A22R
45V45A-86B22R
45V45A-86C22R
45V45A-86D22R
45V50A-86A22R
45V50A-86B22R
45V50A-86C22R
45V50A-86D22R
45V57A-86A22R
45V57A-86B22R
45V57A-86C22R
45V57A-86D22R
45V60A-86A22R
45V60A-86B22R
45V60A-86C22R
45V60A-86D22R
45V66A-86A22R
45V66A-86B22R
45V66A-86C22R
45V66A-86D22R
45V76A-86A22R
45V76A-86B22R
45V76A-86C22R
45V76A-86D22R
(1) pressure relief circuit
①果用方向阀的泄压回路如图 8-40(a)所示，在液压缸上腔的支路上并联一只两位两通电液换向阀成小型电磁阀1,当缸3下行时，1DT不通电。当主缸3下行完成压制保压等工作行程后，借助时间继电器使1DT先通电1- 38,使液压缸3上腔通油箱先进行泄压。当 液压缸上腔压力降至接近于零压时，再接通阀2(3DT通电)换向，使液压缸3上升回程，这样缸3上腔在回程前有一个能量先行释放的过程，不会再有炮鸣现象。
1 the pressure relief circuit of the direction valve is shown in Fig. 8 / 40 (a). A two-position two-way electro-hydraulic commutator valve is connected in parallel on the branch of the upper cavity of the hydraulic cylinder to form a small solenoid valve 1. When the cylinder 3 is downlink, the 1DT does not power on. When the main cylinder 3 completes the working stroke such as pressing and holding pressure, with the help of the time relay, the 1DT is first powered on 1-38, and the hydraulic cylinder 3 upper cavity oil tank is first used to relieve the pressure. When the pressure of the upper chamber of the cylinder drops to close to zero pressure, then turn on valve 2 (3DT on) to make the hydraulic cylinder 3 rise and return, so that the upper chamber of the cylinder 3 has a process of energy release before the return, and there will be no more gunfire.
图840(b)所示的泄压回路，则是利用主换向阀2的中位机能(J型或H型)，在换向前先泄压的回路。缸 3同程前该阀先回到中位( 1DT、2DT 均断电)一小段时间，例如1- 3s,使液压缸3上腔先道油箱进行泄压，持液压缸上腔压力降下来后，1DT再通电进行返回行程。
The relief circuit shown in figure 840 (b) is the one that uses the median function of the main reversing valve 2 (type J or H) to release the pressure ahead of the change. Cylinder 3 before the same trip, the valve first return to the middle (1DT, 2DT are powered off) for a short period of time, such as 1-3s, so that the hydraulic cylinder 3 upper cavity first tank for pressure relief, hold the hydraulic cylinder upper chamber pressure down, 1DT power again to return the stroke.
②采用卸荷阀控制的泄压回路如图 840(c)所示，当液压缸3下行工作行程完成后，1DT通电，换向阀2切换到回程位置(左位)，这时缸3上腔的油液通过单向节流阀5和换向阀2的左位与油箱核通进行卸压。卸压速度由节流阀调节。当液压缸3上腔压力油高于卸荷阀1的调定压力时，阀1依然打开，虹3下腔还是通油池，尽管阀2已换向在缸上行位置，缸3仍不能上行，当液压缸3上腔加压到位，压力下降，使卸荷N 1的控制油压降低，阀1手是关闭，缸3下稳的压力上升面实四回程。
2 the pressure relief circuit controlled by the unloading valve is shown in figure 840 (c). When the downlink stroke of the hydraulic cylinder 3 is completed, the 1DT power up and the commutator valve 2 switches to the return position (left position). At this time, the oil in the upper cavity of the cylinder 3 is unpressurized through the left position of the one-way throttle valve 5 and the commutator valve 2, which is connected to the fuel tank core. Pressure relief speed is regulated by throttle valve. When the pressure of the upper chamber of the hydraulic cylinder 3 is higher than the setting pressure of the unloading valve 1, the valve 1 is still open, the lower chamber of the rainbow 3 is still an oil tank, although valve 2 has been reversed in the upward position of the cylinder, cylinder 3 still cannot ascend, and when the upper chamber of the hydraulic cylinder 3 is pressurized, the pressure of the upper chamber of the hydraulic cylinder 3 is in place. The pressure drop makes the unloading N 1 control oil pressure lower, valve 1 hand is closed, cylinder 3 steady pressure rise su-ce solid four return.
