H42H、H42W立式止回閥正常處于關(guān)閉狀態(tài),由于管線中進(jìn)口端介質(zhì)的壓力作用,而克服彈簧阻力使閥門開啟。當(dāng)進(jìn)口端介質(zhì)壓力低于出口端時(shí),彈簧將閥芯推向閥座而使閥門關(guān)閉,阻止介質(zhì)逆流,故起止回作用。進(jìn)典閥門H42W立式止回閥由于采用彈簧支撐閥芯,故采用立式安裝或臥式裝均可。
立式止回閥主要性能規(guī)范
立式止回閥型號(hào) |
公稱壓力 PN(MPa) |
強(qiáng)度試驗(yàn)(MPa) | 密封試驗(yàn)(MPa) |
適用溫度 (℃) |
適用介質(zhì) |
殼體 | 密封 |
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H42W-16P | 1.6 | 2.4 | 1.76 | ≤200 | 硝酸類 |
H42W-25R | 2.5 | 3.75 | 2.75 | ≤200 | 腐蝕性介質(zhì) |
H42W-40P | 4.0 | 6.0 | 4.4 | 水、油品 | 腐蝕性介質(zhì) |
H42W-40R |
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H42Y-40 |
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GB 1.6MPa | ||||||||||||
DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 |
L | 80 | 90 | 105 | 110 | 120 | 140 | 160 | 185 | 210 | 275 | 300 | 380 |
D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 200 | 215 | 245 | 280 | 335 |
Wt | - | - | - | - | - | 7.5 | 9.5 | 11 | 19.5 | 36.5 | 48 | 65 |
GB 2.5MPa | ||||||||||||
DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 |
L | 80 | 90 | 105 | 110 | 120 | 140 | 160 | 185 | 210 | 275 | 300 | 380 |
D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 195 | 230 | 270 | 300 | 360 |
Wt |
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7.5 | 9.5 | 12 | 20 | 38 | 49 | 70 |
GB 4.0MPa | ||||||||||||
DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 |
L | 80 | 90 | 105 | 110 | 120 | 140 | 160 | 185 | 210 | 275 | 300 | 380 |
D | 95 | 105 | 115 | 135 | 145 | 160 | 180 | 195 | 230 | 270 | 300 | 375 |
Wt |
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7.5 | 9.5 | 12 | 20 | 38 | 49 | 72 |