對(duì)夾升降式止回閥,對(duì)夾止回閥
對(duì)夾升降式止回閥其主要功能水錘壓力很小,閥瓣行程短、閥瓣輕巧、具有彈簧輔助關(guān)閉、關(guān)閥速度很快。結(jié)構(gòu)長(zhǎng)度很短、體積很小、重量很輕、為閥門的安裝、搬運(yùn)、存放及管道的布置帶來很大的便利，并能大量節(jié)約材料、降低造價(jià)。
對(duì)夾升降式止回閥主要技術(shù)參數(shù)：
型號(hào) | 公稱壓力PN(MPa) | 試驗(yàn)壓力PS(MPa) | 工作溫度(℃) | 適用介質(zhì) | |
殼體 | 密封 | ||||
H71W-16T | 1.6 | 2.4 | 1.76 | ≤200 | 水、蒸體、油品等 |
H71H-25Q | 2.5 | 3.75 | 2.75 | ≤235 | |
H71W-25H | ≤300 | ||||
H71W-25P | ≤200 | 腐蝕性介質(zhì) | |||
H71W-40H | 4.0 | 6.0 | 4.4 | ≤300 | 水、蒸體、油品等 |
H71W-40P | ≤200 | 腐蝕性介質(zhì) | |||
對(duì)夾升降式止回閥主要零件材料：
規(guī)格型號(hào) | 閥體 | 閥瓣 | 彈簧 |
H71H-16Q、H71H-25Q | QT400-15 | 25 | 50CrCA |
H71W-25H、H71W-40H | 2Cr13 | 1Cr13 | 1Cr18Ni9Ti |
H71W-16P、H71W-25P | ZG1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni9Ti |
流體力學(xué)性能：H71對(duì)夾升降式止回閥的流體阻力系數(shù)、流量系數(shù)及開啟壓力：
公稱通徑 | 閥門全開啟時(shí)的流體阻力系數(shù) | 常溫下閥門全開啟時(shí)的水講E量系數(shù) | 流體的流向 | |||||
DN | NPS | Kvm3=／h | CVU.S | CVU.K | ↑ | ↓ | → | |
開啟壓力近似值KPa | ||||||||
15 | 1/2 | 6.4 | 2.6 | 3.0 | 2.5 | 3 | 2 | 2.5 |
20 | 3/4 | 5.1 | 6.4 | 7.5 | 6.3 | 3 | 2 | 2.5 |
25 | 4 | 4.1 | 12.6 | 14.8 | 12.3 | 3 | 2 | 2.5 |
32 | 11/4 | 4.1 | 19.7 | 23.1 | 19.3 | 3 | 2 | 2.5 |
40 | 11/2 | 3.8 | 29.5 | 63.9 | 28.9 | 3 | 2 | 2.5 |
50 | 2 | 3.5 | 54.6 | 99.9 | 63.5 | 3 | 2 | 2.5 |
65 | 21/2 | 3.5 | 85.4 | 150 | 83.7 | 3 | 2 | 2.5 |
80 | 3 | 3.2 | 128 | 286 | 125 | 3 | 2 | 2.5 |
100 | 4 | 2.8 | 244 | 286 | 249 | 3 | 2 | 2.5 |
125 | 5 | 2.9 | 375 | 439 | 368 | 3 | 1 | 2.2 |
150 | 6 | 3.1 | 522 | 611 | 512 | 3 | 1 | 2.2 |
200 | 8 | 3.2 | 915 | 1070 | 897 | 3 | 1 | 2.2 |
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