J41H/Y-16C/25/40/64/100/160铸钢截止阀的启闭件是塞形的阀瓣,密封面呈平面或锥面,阀瓣沿流体的中心线作直线运动。阀杆的运动形式,有升降杆式(阀杆升降,手轮不升降),也有升降旋转杆式(手轮与阀杆一起旋转升降,螺母设在阀体上)。截止阀只适用于全开和全关,不允许作调节和节流。
截止阀属于强制密封式阀门,所以在阀门关闭时,必须向阀瓣施加压力,以强制密封面不泄漏。当介质由阀瓣下方进入阀门时,操作力所需要克服的阻力,是阀杆和填料的摩擦力与由介质的压力所产生的推力,关阀门的力比开阀门的力大,所以阀杆的直径要大,否则会发生阀杆顶弯的故障。近年来,从自密封的阀门出现后,截止阀的介质流向就改由阀瓣上方进入阀腔,这时在介质压力作用下,关阀门的力小,而开阀门的力大,阀杆的直径可以相应地减少。同时,在介质作用下,这种形式的阀门也较严密。我国阀门“三化给”曾规定,截止阀的流向,一律采用自上而下。
截止阀开启时,阀瓣的开启高度,为公称直径的25%~30%时,流量已达到zui大,表示阀门已达全开位置。所以截止阀的全开位置,应由阀瓣的行程来决定。
铸钢截止阀主要尺寸
2.5MPa |
DN |
L |
D |
D1 |
D2 |
B |
n-φd |
H |
D0 |
凸面法兰 |
10 |
130 |
90 |
60 |
40 |
16 |
4-φ14 |
198 |
120 |
15 |
130 |
95 |
65 |
45 |
16 |
4-φ14 |
218 |
120 |
|
20 |
150 |
105 |
75 |
55 |
16 |
4-φ14 |
258 |
140 |
|
25 |
160 |
115 |
85 |
65 |
16 |
4-φ14 |
275 |
140 |
|
32 |
180 |
135 |
100 |
78 |
18 |
4-φ18 |
280 |
160 |
|
40 |
200 |
145 |
110 |
85 |
18 |
4-φ18 |
330 |
180 |
|
50 |
230 |
160 |
125 |
100 |
20 |
4-φ18 |
350 |
200 |
|
65 |
290 |
180 |
145 |
120 |
22 |
8-φ18 |
400 |
280 |
|
80 |
310 |
195 |
160 |
135 |
22 |
8-φ18 |
355 |
280 |
|
100 |
350 |
230 |
190 |
160 |
24 |
8-φ23 |
415 |
320 |
|
125 |
400 |
270 |
220 |
188 |
28 |
8-φ25 |
460 |
360 |
|
150 |
480 |
300 |
250 |
218 |
30 |
8-φ25 |
510 |
450 |
|
200 |
600 |
360 |
3lO |
278 |
34 |
12-φ25 |
710 |
500 |
|
250 |
650 |
425 |
370 |
332 |
36 |
12-φ30 |
786 |
550 |
|
300 |
750 |
485 |
430 |
390 |
40 |
16-φ30 |
925 |
600 |
|
350 |
850 |
550 |
490 |
448 |
44 |
16-φ34 |
1075 |
700 |
|
400 |
950 |
610 |
550 |
505 |
48 |
16-φ34 |
1235 |
800 |
|
450 |
1200 |
660 |
600 |
555 |
50 |
20-φ34 |
- |
1000 |
|
500 |
1250 |
730 |
660 |
61O |
52 |
20-φ41 |
- |
1000 |
4.OMPa
|
DN
|
L
|
D
|
Dl
|
D2
|
D6
|
b
|
n-φd
|
H
|
DO
|
凹凸法兰
MFM J41H J41Y J41W J41F J41N 40 40P 40R 40I |
10
|
130
|
90
|
60
|
41
|
35
|
14
|
4-φ14
|
198
|
120
|
15
|
130
|
95
|
65
|
45
|
40
|
16
|
4-φ14
|
233
|
120
|
|
20
|
150
|
105
|
75
|
55
|
51
|
16
|
4-φ14
|
275
|
140
|
|
25
|
160
|
115
|
85
|
65
|
58
|
16
|
4-φ14
|
285
|
160
|
|
32
|
180
|
135
|
100
|
78
|
66
|
18
|
4-φ18
|
302
|
160
|
|
40
|
200
|
145
|
110
|
85
|
76
|
18
|
4-φ18
|
355
|
200
|
|
50
|
230
|
160
|
125
|
100
|
88
|
20
|
4-φ18
|
373
|
200
|
|
65
|
290
|
180
|
145
|
120
|
110
|
22
|
8-φ18
|
408
|
280
|
|
80
|
310
|
195
|
160
|
135
|
121
|
22
|
8-φ18
|
436
|
280
|
|
100
|
350
|
230
|
190
|
160
|
150
|
24
|
8-φ23
|
480
|
320
|
|
125
|
400
|
270
|
220
|
188
|
176
|
28
|
8-φ25
|
588
|
360
|
|
150
|
480
|
300
|
250
|
218
|
204
|
30
|
8-φ25
|
611
|
400
|
|
200
|
600
|
375
|
320
|
282
|
260
|
38
|
12-φ30
|
720
|
400
|
|
6.4MPa
|
15
|
170
|
105
|
75
|
55
|
40
|
18
|
4-φ14
|
195
|
400
|
凹凸法兰
MFM J41H J41Y J41W J41F J41N 64 64P 64R 64I |
20
|
190
|
125
|
90
|
68
|
51
|
20
|
4-φ18
|
228
|
160
|
25
|
210
|
135
|
100
|
78
|
58
|
22
|
4-φ18
|
275
|
180
|
|
32
|
230
|
150
|
110
|
82
|
66
|
24
|
4-φ23
|
325
|
200
|
|
40
|
260
|
165
|
125
|
95
|
76
|
24
|
4-φ23
|
360
|
240
|
|
50
|
300
|
175
|
135
|
105
|
88
|
26
|
4-φ23
|
4lO
|
280
|
|
65
|
340
|
200
|
160
|
130
|
110
|
28
|
8-φ23
|
450
|
320
|
|
80
|
380
|
210
|
170
|
140
|
121
|
30
|
8-φ23
|
485
|
360
|
|
100
|
430
|
250
|
200
|
168
|
150
|
32
|
8-φ25
|
537
|
400
|
|
125
|
500
|
295
|
240
|
202
|
176
|
36
|
8-φ30
|
631
|
400
|
|
150
|
550
|
340
|
280
|
240
|
204
|
38
|
8-φ34
|
646
|
450
|
|
200
|
650
|
405
|
345
|
300
|
260
|
44
|
12-φ34
|
813
|
500
|
|
10.0MPa
|
10
|
170
|
100
|
70
|
50
|
35
|
20
|
4-φ14
|
198
|
140
|
凹凸法兰
MFM J41H J41Y J41W 100 100P 100R 100I |
15
|
170
|
105
|
75
|
55
|
40
|
20
|
4-φ14
|
202
|
140
|
20
|
190
|
125
|
90
|
68
|
51
|
22
|
4-φ18
|
228
|
160
|
|
25
|
210
|
135
|
100
|
78
|
58
|
24
|
4-φ18
|
250
|
180
|
|
32
|
230
|
150
|
110
|
82
|
66
|
24
|
4-φ23
|
326
|
200
|
|
40
|
260
|
165
|
125
|
95
|
76
|
26
|
4-φ23
|
360
|
240
|
|
50
|
300
|
195
|
145
|
112
|
88
|
28
|
4-φ25
|
414
|
280
|
|
65
|
340
|
220
|
170
|
138
|
110
|
32
|
8-φ25
|
434
|
320
|
|
80
|
380
|
230
|
180
|
148
|
121
|
34
|
8-φ25
|
547
|
360
|
|
100
|
430
|
265
|
2lO
|
172
|
150
|
38
|
8-φ30
|
621
|
400
|
|
125
|
500
|
310
|
250
|
210
|
176
|
42
|
8-φ34
|
732
|
400
|
|
150
|
550
|
350
|
290
|
250
|
204
|
46
|
12-φ34
|
840
|
450
|
|
200
|
650
|
430
|
360
|
312
|
260
|
54
|
12-φ41
|
925
|
500
|
|
16.0MPa
|
15
|
170
|
110
|
75
|
52
|
40
|
24
|
4-φ18
|
148
|
140
|
凹凸法兰
MFM J41H J41Y J41W 160 160P 160R 160I |
20
|
190
|
130
|
90
|
62
|
51
|
26
|
4-φ23
|
158
|
160
|
25
|
210
|
140
|
100
|
72
|
58
|
28
|
4-φ23
|
175
|
180
|
|
32
|
230
|
165
|
115
|
85
|
66
|
30
|
4-φ25
|
200
|
200
|
|
40
|
260
|
175
|
125
|
92
|
76
|
32
|
4-φ27
|
231
|
240
|
|
50
|
300
|
215
|
165
|
132
|
88
|
36
|
8-φ25
|
262
|
280
|
|
65
|
340
|
245
|
190
|
152
|
110
|
44
|
8-φ30
|
303
|
320
|
|
80
|
380
|
260
|
205
|
168
|
121
|
46
|
8-φ30
|
341
|
360
|
|
100
|
430
|
300
|
240
|
200
|
150
|
48
|
8-φ34
|
485
|
400
|