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联系人：普斯威德、线圈通断电是否正常，电压是否正常。
5、判断先导阀有无动作：线圈通断电时有“嗒嗒嗒”的阀芯撞击音，说明先导阀动作正常。此时好仅四通阀通电，以便听清声音。
6、先导阀动作正常，主阀体不动作，说明四通阀换向所需的低动作压力差没有建立起来，向系统内充入制冷剂。
7、液压冲击。可能是a.四通阀安装方向错；b优势供应力士乐rexroth全系列比例阀
rexroth6通径比例阀现货
rexroth10通径比例阀现货
rexroth16通径比例阀现货
rexroth32通径比例阀现货
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4WRA6W30-2X/G24K4/V-589
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4WRA10E60-22/G24N9K4/V
4WRAE6W1-07-2X/G24K31/F1V
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4WRAE6W15-2X/G24K31/F1V
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4WRAE10W1-60-22/G24K31/F1V
4WRAE10W30-2X/G24K31/F1V
4WRAE10W1-30-2X/G24N9K31/F1V
4WRAE10W1-30-2X/G24N9K31/F1V
4WRAEB6E15-22/G24N9K31/A1V
4WRAP6W7-02-3X/G24K4/M R900972650
4WRBA6E15-2X/G24N9Z4/M
4WRBA6E30-2X/G24N9Z4/M
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4WRE6WA16-1X/G24K4/M
4WRE6W16-2X/G24K4/V
4WRE6W32-2X/G24K4/V
4WRE10W1-50-2X/G24K4/V
4WRE10W1-75-2X/G24K4/V
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4WREE6E16-22/G24K31/A1V-655
4WREE6E32-2X/G24K31/A1V
4WREE6EA08-2X/G24K31/F1V
4WREE6EA08-2X/G24K31/F1V
4WREE6W1-08-2X/G24K31/F1V
4WREE6W1-32-2X/G24K31/A1V
4WREE6E1-32-2X/G24K31/A1V
4WREE6W2-32-24/G24K31/A1V
4WREE10W50-2X/G24K31/F1V
4WREE10W1-50-2X/G24K31/F1V
4WRKE10W6-100L-3X/6EG24K31/F1D3M
4WRKE16E200L-3X/6EG24EK31/A1D3M
4WRKE16E200L-3X/6EG24ETK31/A1D3M
4WRKE16W8-200L-31/6EG24ETK31/A1D3M
4WRKE16W6-200L-3X/6EG24K31/A5D3M
4WRKE25W8-220L-3X/6EG24EK31/F1D3M
4WRKE32W8-600L-33/6EG24EK31/A1D3V
4WRP10EA32S-1X/G24Z4/M-792
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4WRPH6C3B40L-2X/G24Z4/M
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4WRPEH6C3B24L-2X/G24K0/F1M 0811404633
4WRPEH6C3B40L-2X/G24KO/F1M-885
4WRPEH6C4B04L-2X/G24K0/F1M.使用的是涡旋式压缩机；c.冬天气温太低；d.截止阀未打开。电液比例伺服阀（简称比例阀）是由比例电磁铁取代普通液压阀的调节和控制装置而构成的。它可以按给定的输入电压或电流信号连续地按比例地远距离地控制流体的方向、压力和流量。DG5V-5-2C-M-U-D6-10
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DG5V-7-6C-M-U-C6-30
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DG5V-7-2C-VMU-H5-40（带插头）
DG5S-8-2N-T-K-M-FPA5WL-B
DG5V-7-2AL-T-M-U-H5-40
DGFN-06-50
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DG5S-8-2B-M-U-H5-30DGMC-5-PT-FW-B-30
DG5V-8-S-6C-T-M-U-H-10
采用电液比例控制阀提高了系统的自动化程度和精度，又简化了系统。
比例阀的工作虽用伺服阀可完成，但后者精度高、价格贵，对油液清洁度要求更高。比例阀主要结构与普通阀差别不大，只是比例阀均由比例电磁铁驱动
