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型号参数：
| Series | Body | Ports | Seat | Inlet Pressure | Outlet Pressure | Gauge | Inlet/Outlet Connections | Options |
|---|---|---|---|---|---|---|---|---|
| U21 | SL: 316L | A: 2 port | K: PCTFE* | D: 3000psig | F: 0-500psig | P: with gauge | 91: FSR(1/4"F) | E: 10 μin |
| B: 3 port | V: Vespel® | F: 500psig | G: 0-250psig | W: without gauge | 92: FSR(1/4"M) | P: Panel mounting | ||
| G: 4 port | I: 0-100psig | 41: 1/4" tube weld stub | I: Internal 1/4" FSR(F) gauge ports | |||||
| J: 4 port | K: 0-50 psig | |||||||
| M: 5 port | L: 0-25 psig |
