截止閥又稱截門閥,屬于強(qiáng)制密封式閥門,所以在閥門關(guān)閉時(shí),必須向閥瓣施加壓力,以強(qiáng)制密封面不泄漏。當(dāng)介質(zhì)由閥瓣下方進(jìn)入閥門時(shí),操作力所需要克服的阻力,是閥桿和填料的摩擦力與由介質(zhì)的壓力所產(chǎn)生的推力,關(guān)閥門的力比開閥門的力大,所以閥桿的直徑要大,否則會(huì)發(fā)生閥桿頂彎的故障。按連接方式分為三種:法蘭連接、絲扣連接、焊接連接。從自密封的閥門出現(xiàn)后,截止閥的介質(zhì)流向就改由閥瓣上方進(jìn)入閥腔,這時(shí)在介質(zhì)壓力作用下,關(guān)閥門的力小,而開閥門的力大,閥桿的直徑可以相應(yīng)地減少。同時(shí),在介質(zhì)作用下,這種形式的閥門也較嚴(yán)密。我國(guó)閥門“三化給”曾規(guī)定,截止閥的流向,一律采用自上而下。截止閥開啟時(shí),閥瓣的開啟高度,為公稱直徑的25%~30%時(shí).流量已達(dá)到,表示閥門已達(dá)全開位置。所以截止閥的全開位置,應(yīng)由閥瓣的行程來(lái)決定。
主要外形尺寸及連接尺寸:
國(guó)標(biāo)(GB)PN1.6MPa | ||||||||
DN | L | D | D1 | D2 | b | f | Z-фd | H |
15 | 130 | 95 | 65 | 45 | 14 | 2 | 4-ф14 | 190 |
20 | 150 | 105 | 75 | 55 | 14 | 2 | 4-ф14 | 205 |
25 | 160 | 115 | 85 | 65 | 14 | 2 | 4-ф14 | 210 |
32 | 180 | 135 | 100 | 78 | 16 | 2 | 4-ф18 | 240 |
40 | 200 | 145 | 110 | 85 | 16 | 3 | 4-ф18 | 260 |
50 | 230 | 160 | 125 | 100 | 16 | 3 | 4-ф18 | 285 |
65 | 290 | 180 | 145 | 120 | 18 | 3 | 4-ф18 | 340 |
80 | 310 | 195 | 160 | 135 | 20 | 3 | 8-ф18 | 365 |
100 | 350 | 215 | 180 | 155 | 20 | 3 | 8-ф18 | 400 |
125 | 400 | 245 | 210 | 185 | 22 | 3 | 8-ф18 | 450 |
150 | 480 | 280 | 240 | 210 | 24 | 3 | 8-ф23 | 505 |
200 | 600 | 335 | 295 | 265 | 26 | 3 | 12-ф23 | 600 |
250 | 650 | 405 | 355 | 320 | 30 | 3 | 12-ф25 | 680 |
300 | 750 | 460 | 410 | 375 | 30 | 4 | 12-ф25 | 800 |
350 | 850 | 520 | 470 | 435 | 34 | 4 | 16-ф25 | 900 |
400 | 980 | 580 | 525 | 485 | 36 | 4 | 16-ф30 | 1100 |
450 | 1100 | 640 | 585 | 545 | 40 | 4 | 20-ф30 | 1220 |
500 | 1150 | 705 | 650 | 608 | 44 | 4 | 20-ф34 | 1450 |
600 | 1355 | 840 | 770 | 718 | 48 | 5 | 20-ф36 | 1810 |
國(guó)標(biāo)(GB)PN2.5MPa | ||||||||
DN | L | D | D1 | D2 | b | f | Z-фd | H |
15 | 130 | 95 | 65 | 45 | 16 | 2 | 4-ф14 | 218 |
20 | 150 | 105 | 75 | 55 | 16 | 2 | 4-ф14 | 258 |
25 | 160 | 115 | 85 | 65 | 16 | 2 | 4-ф14 | 275 |
32 | 180 | 135 | 100 | 78 | 18 | 2 | 4-ф18 | 280 |
40 | 200 | 145 | 110 | 85 | 18 | 3 | 4-ф18 | 330 |
50 | 230 | 160 | 125 | 100 | 20 | 3 | 4-ф18 | 350 |
65 | 290 | 180 | 145 | 125 | 22 | 3 | 4-ф18 | 400 |
80 | 310 | 195 | 160 | 145 | 22 | 3 | 8-ф18 | 355 |
100 | 350 | 230 | 190 | 160 | 24 | 3 | 8-ф23 | 415 |
125 | 400 | 270 | 220 | 188 | 28 | 3 | 8-ф25 | 460 |
150 | 480 | 300 | 250 | 218 | 30 | 3 | 8-ф25 | 510 |
200 | 600 | 360 | 310 | 278 | 34 | 3 | 12-ф25 | 710 |
250 | 650 | 405 | 370 | 332 | 36 | 3 | 12-ф30 | 786 |
300 | 750 | 460 | 430 | 390 | 40 | 4 | 16-ф30 | 925 |
350 | 850 | 520 | 490 | 448 | 44 | 4 | 16-ф34 | 1030 |
400 | 980 | 580 | 550 | 505 | 48 | 4 | 16-ф34 | 1170 |
450 | 1100 | 640 | 600 | 555 | 50 | 4 | 20-ф34 | 1220 |
500 | 1150 | 705 | 660 | 610 | 52 | 4 | 20-ф36 | 1450 |
600 | 1355 | 840 | 770 | 718 | 56 | 5 | 20-ф41 | 1810 |
國(guó)標(biāo)(GB)PN4.0MPa | ||||||||
DN | L | D | D1 | D2 | b | f | Z-фd | H |
15 | 130 | 95 | 65 | 45 | 16 | 2 | 4-ф14 | 233 |
20 | 150 | 105 | 75 | 55 | 16 | 2 | 4-ф14 | 275 |
25 | 160 | 115 | 85 | 65 | 16 | 2 | 4-ф14 | 285 |
32 | 180 | 135 | 100 | 78 | 18 | 2 | 4-ф18 | 302 |
40 | 200 | 145 | 110 | 85 | 18 | 3 | 4-ф18 | 355 |
50 | 230 | 160 | 125 | 100 | 20 | 3 | 4-ф18 | 373 |
65 | 290 | 180 | 145 | 125 | 22 | 3 | 8-ф18 | 408 |
80 | 310 | 195 | 160 | 145 | 22 | 3 | 8-ф18 | 436 |
100 | 350 | 230 | 190 | 160 | 24 | 3 | 8-ф23 | 480 |
125 | 400 | 270 | 220 | 188 | 28 | 3 | 8-ф25 | 558 |
150 | 480 | 300 | 250 | 218 | 30 | 3 | 8-ф25 | 611 |
200 | 600 | 375 | 320 | 282 | 38 | 3 | 12-ф30 | 665 |
250 | 750 | 445 | 385 | 345 | 42 | 3 | 12-ф34 | 720 |
300 | 850 | 510 | 450 | 408 | 46 | 4 | 16-ф34 | |
350 | 980 | 570 | 510 | 465 | 52 | 4 | 16-ф34 | 860 |
400 | 1100 | 655 | 585 | 535 | 58 | 4 | 16-ф41 | 1010 |
450 | 1150 | 680 | 610 | 560 | 60 | 4 | 20-ф41 | 1190 |
500 | 1355 | 755 | 670 | 612 | 62 | 4 | 20-ф42 | 1260 |
國(guó)標(biāo)(GB)PN6.4MPa | ||||||||
DN | L | D | D1 | D2 | b | f | Z-фd | H |
15 | 170 | 105 | 75 | 55 | 18 | 2 | 4-ф14 | 195 |
20 | 190 | 125 | 90 | 68 | 20 | 2 | 4-ф18 | 228 |
25 | 210 | 135 | 100 | 78 | 22 | 2 | 4-ф18 | 275 |
32 | 230 | 150 | 110 | 82 | 24 | 2 | 4-ф23 | 325 |
40 | 260 | 165 | 125 | 95 | 24 | 3 | 4-ф23 | 360 |
50 | 300 | 175 | 135 | 105 | 26 | 3 | 4-ф23 | 410 |
65 | 340 | 200 | 160 | 130 | 28 | 3 | 8-ф23 | 450 |
80 | 380 | 210 | 170 | 140 | 30 | 3 | 8-ф23 | 485 |
100 | 430 | 240 | 200 | 168 | 32 | 3 | 8-ф25 | 537 |
125 | 500 | 250 | 240 | 202 | 36 | 3 | 8-ф30 | 631 |
150 | 550 | 340 | 280 | 240 | 38 | 3 | 8-ф34 | 646 |
200 | 650 | 405 | 345 | 300 | 44 | 3 | 12-ф34 | 813 |
250 | 775 | 470 | 400 | 352 | 48 | 3 | 12-ф36 | 985 |
300 | 900 | 530 | 460 | 412 | 54 | 4 | 16-ф36 | 1214 |
350 | 1025 | 600 | 525 | 475 | 60 | 4 | 16-ф42 | 1432 |
400 | 1150 | 670 | 585 | 525 | 66 | 4 | 20-ф48 | 1650 |
國(guó)標(biāo)(GB)PN10.0MPa | ||||||||
DN | L | D | D1 | D2 | b | f | Z-фd | H |
15 | 170 | 105 | 75 | 55 | 20 | 2 | 4-ф14 | 202 |
20 | 190 | 125 | 90 | 68 | 22 | 2 | 4-ф18 | 228 |
25 | 210 | 135 | 100 | 78 | 24 | 2 | 4-ф18 | 250 |
32 | 230 | 150 | 110 | 82 | 24 | 2 | 4-ф23 | 326 |
40 | 260 | 165 | 125 | 95 | 24 | 3 | 4-ф23 | 359 |
50 | 300 | 195 | 145 | 112 | 26 | 3 | 4-ф25 | 414 |
65 | 340 | 220 | 170 | 138 | 28 | 3 | 8-ф25 | 434 |
80 | 380 | 230 | 180 | 148 | 32 | 3 | 8-ф30 | 547 |
100 | 430 | 265 | 210 | 172 | 34 | 3 | 8-ф30 | 621 |
125 | 500 | 310 | 250 | 210 | 38 | 3 | 8-ф34 | 732 |
150 | 550 | 350 | 290 | 250 | 42 | 3 | 12-ф34 | 840 |
200 | 650 | 430 | 360 | 312 | 46 | 3 | 12-ф41 | 925 |
250 | 775 | 505 | 430 | 382 | 54 | 3 | 12-ф41 | 1155 |
300 | 900 | 585 | 500 | 4420 | 70 | 4 | 16-ф42 | 1340 |