费斯托单向节流阀

费斯托单向节流阀GRLA-1/8-QS-3-D：FESTO电磁阀的主要特点：外漏堵绝，内漏易控，使用安全。内外泄漏是危及安全的要素。其它自控阀通常将阀杆伸出，由电动、气动、液动执行机构控制阀芯的转动或移动。这都要解决长期动作阀杆动密封的外泄漏难题；唯有电磁阀是用电磁力作用于密封在电动调节阀隔磁套管内的铁芯完成，不存在动密封，所以外漏易堵绝。

费斯托单向节流阀GRLA-1/8-QS-3-D：

费斯托单向节流阀

FESTO电磁阀从原理上分为三大类：

1、直动式电磁阀：原理：通电时，电磁线圈产生电磁力把关闭件从阀座上提起，阀门打开；断电时，电磁力消失，弹簧把关闭件压在阀座上，阀门关闭。特点：在真空、负压、零压时能正常工作，但通径一般不超过25mm。

2、分步直动式电磁阀：原理：它是一种直动和先导式相结合的原理，当入口与出口没有压差时，通电后，电磁力直接把先导小阀和主阀关闭件依次向上提起，阀门打开。当入口与出口达到启动压差时，通电后，电磁力先导小阀，主阀下腔压力上升，上腔压力下降，从而利用压差把主阀向上推开；断电时，先导阀利用弹簧力或介质压力推动关闭件，向下移动，使阀门关闭。特点：在零压差或真空、高压时亦能可*动作，但功率较大，要求必须水平安装。

3、先导式电磁阀：原理：通电时，电磁力把先导孔打开，上腔室压力迅速下降，在关闭件周围形成上低下高的压差，流体压力推动关闭件向上移动，阀门打开；断电时，弹簧力把先导孔关闭，入口压力通过旁通孔迅速腔室在关阀件周围形成下低上高的压差，流体压力推动关闭件向下移动，关闭阀门。特点：流体压力范围上限较高，可任意安装（需定制）但必须满足流体压差条件。电磁阀从阀结构和材料上的不同与原理上的区别，分为六个分支小类：直动膜片结构、分步直动膜片结构、先导膜片结构、直动活塞结构、分步直动活塞结构、先导活塞结构。

MOFH-3-3/4
MFHE-3-3/8
JMFH-5-1/8-S
JMFH-5-1/4-S
MOEH-3-PK-3
MFHE-3-1/4-B
MVH-5/3E-3/8-B
MVH-5/3G-3/8-B
MVH-5-3/8-B
MFH-5-3/8-L-B
MVH-5-3/8-L-B
JMVH-5-3/8-B
MFH-5-1/4-B
MFH-5-1/4-S-B
MVH-5-1/4-S-B
MVH-5/3B-3/8-B
JMFH-5-3/8-B
MVH-5-1/4-B
JMFH-5-3/8-S-B
MFH-5-3/8-B
MFH-5-3/8-S-B
MFH-5/3G-3/8-B
MFH-5/3E-3/8-B
MFH-5/3B-3/8-B
MVH-5-1/8-L-B
MVH-5-1/8-L-S-B
MFH-5-1/8-B
MFH-5-1/8-S-B
MVH-5-1/8-B
MFH-5/3E-1/4-B
MFH-5/3G-1/4-B
MFH-5/3B-1/4-B
JMFH-5-1/4-B
JMFH-5-1/4-S-B
JMVH-5-1/8-B
JMVH-5-1/8-S-B
MVH-5/3G-1/8-B
MVH-5/3E-1/8-B
MVH-5/3B-1/8-B
MFH-5/3E-1/8-B
MFH-5/3G-1/8-B
MFH-5/3B-1/8-B
JMFH-5-1/8-B
JMFH-5-1/8-S-B
MFH-5-1/8-L-B
MFH-5-1/8-L-S-B
MFH-5/3G-1/8-S-B
MFH-5/3E-1/8-S-B
MFH-5/3B-1/8-S-B
MVH-5-1/8-S-B
MVH-5/3G-1/8-S-B
MVH-5/3E-1/8-S-B
MVH-5/3B-1/8-S-B
MFH-5/3G-1/4-S-B
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MVH-5/3G-1/4-S-B
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MVH-5/3B-1/4-S-B
MVH-5-1/4-L-B
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MFH-5/3G-3/8-S-B
MFH-5/3E-3/8-S-B
MFH-5/3B-3/8-S-B
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MFH-5-3/8-L-S-B
MVH-5-1/4-L-S-B
MFH-5-1/4-L-S-B
MFH-5-1/2-S
JMFH-5-1/2-S
MFH-5-3,3
JMF-5-PK-3
MOFH-3-M5
MFH-3-M5
MFH-5-1/4
MFH-5-1/8
MFH-3-1/2
MFH-3-3/4
JMFH-5-1/2-S
JMFH-5-1/2-S
MFH-5/2-D-2-C
JMFH-5/2-D-2-C
JMFDH-5/2-D-2-C
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JMVDH-5/2-D-2-C
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J-5/2-D-3-C
JD-5/2-D-3-C
VL-5/3G-D-3-C
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VL/O-3-PK-3
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VL-5-PK-3
VL-5/4-1/4
VLL-5-PK-3