威格士電磁閥@美國威格士
VICKERS電磁閥和安全閥為一體,，組成先導(dǎo)式壓力閥，該閥即是卸荷閥又是安全閥,，有時(shí)又是溢流閥．卸荷時(shí)其控制油道貫穿各路換向閥,，同前述卸荷油道．當(dāng)各路換向閥處于中立位置時(shí)，卸荷閥的控制油道（見圖1b和圖2）貫穿各路換向閥并與油箱連通．卸荷時(shí),，大部分油液卸荷,，通道短，壓力損失低．任一路閥換向工作,，便切斷控制油道,，油源來油就從換向閥進(jìn)入執(zhí)行元件工作，其工作壓力大小由導(dǎo)閥控制．此時(shí)系統(tǒng)壓力為導(dǎo)閥調(diào)整壓力．該種卸荷方式,，即使換向閥路數(shù)增加,，只是控制油道增加，卸荷壓力增加不大,，始終保持較低卸荷壓力,，此種卸荷方式多用于手動換向閥，卸荷可靠．
VICKERS電磁閥主要用在電氣液壓伺服系統(tǒng)中作為執(zhí)行元件（見液壓伺服系統(tǒng)）,。在伺服系統(tǒng)中,，液壓執(zhí)行機(jī)構(gòu)同電氣及氣動執(zhí)行機(jī)構(gòu)相比，具有快速性好,、單位重量輸出功率大,、傳動平穩(wěn)、抗干擾能力強(qiáng)等特點(diǎn),。另一方面,，在伺服系統(tǒng)中傳遞信號和校正特性時(shí)多用電氣元件。因此,，現(xiàn)代高性能的伺服系統(tǒng)也都采用電液方式,，伺服閥就是這種系統(tǒng)的必需元件
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威格士電磁閥@美國威格士
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