一、活塞式蒸汽减压阀 Y43H-16/25C 概述：本产品由主阀和导阀两部分组成；主阀主要由阀座、阀盘、活塞、缸套、弹簧等零件组成；导阀主要由阀座、阀瓣、膜片、弹簧、调节弹簧等零件组成。通过调节弹簧压力设定出口压力,利用膜片传感出口压力变化,通过导阀启闭驱动活塞调节主阀节流部位过流面积的大小,实现减压稳压功能。
二、活塞式蒸汽减压阀 Y43H-16/25C 相关技术参数：
型 | 号 |
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| 公称压力 |
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| 试验项目（Mpa） |
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| 工作温度 |
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| 适用 |
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| Mpa |
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| 强度（水） |
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| 密封水 |
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| 低压气密封 |
| ℃ |
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| 介质 |
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Y43H-16C |
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| 1.6 |
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| 2.4 |
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| 1.76 |
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| 0.6 |
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| ≤425 |
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| 蒸汽 |
Y43H-25 |
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| 2.5 |
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| 3.75 |
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| 2.75 |
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| 0.6 |
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| ≤425 |
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三、活塞式蒸汽减压阀 Y43H-16/25C 流量系数 CV： |
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DN | 15 |
| 20 |
| 25 |
| 32 | 40 | 50 |
| 65 |
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| 80 |
| 100 |
| 125 |
| 150 | 200 | 250 | 300 | 350 | 400 |
| 500 |
CV | 1 |
| 2.5 |
| 4 |
| 6.5 | 9 | 16 |
| 25 |
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| 36 |
| 64 |
| 100 |
| 140 | 250 | 400 | 570 | 780 | 102 |
| 1500 |
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| 0 |
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四、活塞式蒸汽减压阀 Y43H-16C 相关连接尺寸： |
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| 型号 |
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| DN |
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| L | D |
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| D1 |
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| n-Φd |
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| 重量 |
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| 15 |
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| 160 | 95 |
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| 65 |
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| 45 |
| 16-2 |
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| 4-14 |
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| 20 |
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| 160 | 105 |
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| 75 |
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| 55 |
| 16-2 |
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| 4-14 |
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| 25 |
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| 180 | 115 |
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| 85 |
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| 65 |
| 16-2 |
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| 4-14 |
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| 410 |
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| 16 |
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| 32 |
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| 200 | 135 |
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| 100 |
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| 78 |
| 18-2 |
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| 4-18 |
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| 428 |
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| 17 |
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| 40 |
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| 220 | 145 |
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| 110 |
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| 85 |
| 18-3 |
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| 4-18 |
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| 435 |
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| 25 |
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| 50 |
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| 250 | 160 |
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| 125 |
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| 100 |
| 18-3 |
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| 4-18 |
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| 446 |
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| 30 |
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| 65 |
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| 280 | 180 |
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| 145 |
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| 120 |
| 18-3 |
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| 4-18 |
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| 495 |
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| 36 |
Y43H-16C |
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| 80 |
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| 310 | 195 |
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| 160 |
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| 135 |
| 20-3 |
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| 8-18 |
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| 530 |
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| 51 |
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| 100 |
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| 350 | 215 |
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| 180 |
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| 155 |
| 20-3 |
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| 8-18 |
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| 550 |
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| 54 |
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| 125 |
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| 400 | 245 |
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| 210 |
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| 185 |
| 22-3 |
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| 8-18 |
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| 620 |
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| 94 |
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| 150 |
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| 450 | 280 |
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| 240 |
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| 210 |
| 24-3 |
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| 8-23 |
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| 665 |
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| 112 |
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| 200 |
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| 500 | 335 |
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| 295 |
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| 265 |
| 26-3 |
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| 12-23 |
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| 770 |
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| 170 |
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| 250 |
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| 650 | 405 |
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| 355 |
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| 320 |
| 30-3 |
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| 12-25 |
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| 300 |
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| 800 | 460 |
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| 410 |
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| 375 |
| 30-4 |
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| 12-25 |
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| 350 |
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| 850 | 520 |
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| 470 |
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| 435 |
| 34-4 |
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| 16-25 |
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| 400 |
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| 900 | 580 |
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| 525 |
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| 485 |
| 36-4 |
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| 16-30 |
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| 500 |
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| 950 | 705 |
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| 650 |
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| 608 |
| 44-4 |
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| 20-34 |
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五、活塞式蒸汽减压阀 Y43H-25 相关连接尺寸：
型号 | DN | L | D | D1 | D2 | b-f | n-Φd | H | 重量 |
| 15 | 160 | 95 | 65 | 45 | 16-2 | 4-14 |
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| 20 | 160 | 105 | 75 | 55 | 16-2 | 4-14 |
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| 25 | 180 | 115 | 85 | 65 | 16-2 | 4-14 | 410 | 16 |
| 32 | 200 | 135 | 100 | 78 | 18-2 | 4-18 | 428 | 17 |
| 40 | 220 | 145 | 110 | 85 | 18-3 | 4-18 | 435 | 25 |
| 50 | 250 | 160 | 125 | 100 | 20-3 | 4-18 | 446 | 30 |
Y43H-25 | 65 | 280 | 180 | 145 | 120 | 22-3 | 8-18 | 495 | 36 |
80 | 310 | 195 | 160 | 135 | 22-3 | 8-18 | 530 | 51 |
| 100 | 350 | 230 | 190 | 160 | 24-3 | 8-23 | 550 | 54 |
| 125 | 400 | 270 | 220 | 188 | 28-3 | 8-25 | 620 | 94 |
| 150 | 450 | 300 | 250 | 218 | 30-3 | 8-25 | 665 | 112 |
| 200 | 500 | 360 | 310 | 278 | 34-3 | 12-25 | 770 | 170 |
| 250 | 650 | 425 | 370 | 332 | 36-3 | 12-30 |
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| 300 | 800 | 485 | 430 | 390 | 40-4 | 16-30 |
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| 350 | 850 | 550 | 490 | 448 | 44-4 | 16-34 |
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| 400 | 900 | 610 | 550 | 505 | 48-4 | 16-34 |
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| 500 | 950 | 730 | 660 | 610 | 52-4 | 20-41 |
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