应用范围：
它**应用于航天、船舶重工、化工、冷冻设备、食品**设备等制冷管道系统中。

产品特点：
阀芯均为不锈钢活塞式，活塞环用特殊耐低温、**材料制作；活塞与金属阀腔不产生直接摩擦，阀体安装方向无限制；**线圈，不易烧毁；长时间停止动作重新启动，作同样灵敏。

主要技术参数：

工作原理：
常闭：当线圈通电时，先导阀芯吸合，先导孔打开，阀上腔卸压，活塞靠下腔介质压力推动，电磁阀打开；当线圈断电时，先导阀芯靠弹簧复位，先导孔关闭，阀上腔由活塞节流孔增压和复位弹簧的推力，电磁阀关闭。
常开：当线圈通电时，先导孔关闭，阀上腔由活塞节流孔增压和复位弹簧的推力，电磁阀关闭。当线圈断电时，先导阀芯靠弹簧复位，先导孔打开，阀上腔卸压，活塞靠下腔介质压力推动，电磁阀打开。

规格尺寸：

Appli**ions:
It is widely used in aerospace, shipbuilding He**y Industry, chemical, refrigeration equipment, Medical equipment, food refrigeration piping systems.

Features:
Spool is stainless steel piston, piston ring with a special low temperature resistant, wear-resistant material; the piston and the metal does not produce direct friction va**e chamber, va**e mounting direction unlimited; special coil, not easy to burn; a long time to s** action to re-start, for the same sensitivity.

Main technical parameters:

How it works:
NC: When the coil is energized, the pilot spool pull the pilot hole to open, pressure relief va**e on the chamber, the piston on the lower chamber medium pressure to promote, the electromagnetic va**e is ope**; When the coil power, the pilot va**e by the spring return, pilot hole closed, the va**e chamber and pressurized by the piston return spring throttle thrust, the electromagnetic va**e is closed.
Normally Open: When the coil is energized, the pilot hole closed, the va**e chamber and pressurized by the piston return spring throttle thrust, the electromagnetic va**e is closed. When the coil power, the pilot va**e by the spring return, pilot hole open, pressure relief va**e on the chamber, medium pressure piston push the lower chamber, the electromagnetic va**e is ope**.

Size:

Note: The outlet pressure is greater than the inlet pressure, the media will pass anti-wizard. Can be installed or custom built non-return va**e function of the va**e.