250A型是一个0.250英寸的孔口，常闭空气先导，弹簧回流阀。设计用于在低先导压力下运行。
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| Item # | 250A 3 10 20 |
| Port Size (NPT inch) | 1/4" |
| Type | 3-Way Air Pilot Spring Return |
| Weight (lbs) | .3 |
| Stock Item | Yes |
| Units Per Package | 1 |
| Minimum Order | 1 |
| Temperature Range | -20º to 225ºF |
| Pressure Range | 0 - 125 PSIG |
| Flow | 50 CFM (Cv=0.8) |
| Resting Valve Position | Closed |
| Manufacturer | Humphrey |
