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,流量已达到较 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。
法兰式截止阀执行标准 Administer Standard
设计与制造 Design and Manufacture
|
结构长度
Face To Face |
法兰尺寸
Flange Dimension |
压力-温度 Pressure Temperature Lating
|
试验-检验 Inspection And Test
|
GB122235
|
GB12221
|
GB9113 JB79
|
GB9131
|
GB/T13927 JB/T9092
|
法兰式截止阀压力试验 Pressure Test
公称压力NominalPressure
|
1.6
|
2.5
|
4.0
|
6.4
|
10.0
|
16.0
|
强度试验 Shell Test
|
2.4
|
3.8
|
6.0
|
9.6
|
15.0
|
24.0
|
水密封试验 Water Seal Test
|
1.8
|
2.8
|
4.4
|
7.0
|
11.0
|
18.0
|
上密封试验Backseat Test
|
1.8
|
2.8
|
4.4
|
7.0
|
11.0
|
18.0
|
气密封试验 Air Seal Test
|
0.5-0.7
|
法兰式截止阀主要零件材料及性能 Main Part Materials and Property
体、盖、板 Body Cover Disc
|
阀杆
Stem |
密封面 Sealing Face
|
垫片
Sealing Shim |
填料
Packing |
工作温度℃ Working Temperature
|
适用介质Suitable Medium
|
|
WCB
|
2Cr13
|
13Cr
STL
木体材料
With Body
Material
尼龙
Nylon
|
增强柔性石墨
Enhanced Flexible Graphite
13Cr/柔性石墨
1Cr13/Flexible Graphite
08软钢
08 Soft Steal
0Cr18Ni9Ti
0Cr17Ni12Mo2Ti
XD550F(T)
PTFE
|
柔性石墨
增强柔性石墨
Flexible Graphite
Enhanced Flexible Graphite
SFB/260
SFP/260
PTFE
|
≤425
|
水
蒸汽
油品
Water
Steam
Petroleum
Ptoducts
|
|
WC1
|
38CrMoAl
25Cr2MoV
|
≤450
|
|||||
WC6
|
≤540
|
||||||
WC9
|
≤570
|
||||||
C5 C12
|
≤540
|
||||||
ZGCr5Mo
|
≤200
|
硝酸类Nitric acid
|
|||||
ZG1Cr18Ni9Ti
|
1Cr18Ni9Ti
|
||||||
≤200
|
醋酸类Acetic acid
|
||||||
ZG1Cr18Ni12Mo2Ti
|
1Cr18Ni12Mo2Ti
|
法兰式截止阀规格 主要尺寸和重量 Size Main Dimensions and Weight (mm kg)
1.6MPa
|
DN
|
L
|
D
|
D1
|
D2
|
b
|
n-φd
|
H
|
Do
|
重量 Weight
|
凸面
法兰
RF J41H J41Y J41W J41F J41N 16C
16P 16R 16I |
10
|
130
|
90
|
60
|
40
|
14
|
4-14
|
198
|
120
|
4.9
|
15
|
130
|
95
|
65
|
45
|
14
|
4-14
|
218
|
120
|
5.3
|
|
20
|
150
|
105
|
75
|
55
|
14
|
4-14
|
258
|
140
|
7.0
|
|
25
|
160
|
115
|
85
|
65
|
14
|
4-14
|
275
|
160
|
7.4
|
|
32
|
180
|
135
|
100
|
78
|
16
|
4-18
|
280
|
180
|
8.3
|
|
40
|
200
|
145
|
110
|
85
|
16
|
4-18
|
330
|
200
|
12.6
|
|
50
|
230
|
160
|
125
|
100
|
16
|
4-18
|
350
|
240
|
14
|
|
65
|
290
|
180
|
145
|
120
|
18
|
4-18
|
400
|
280
|
22.7
|
|
80
|
310
|
195
|
160
|
135
|
20
|
8-18
|
355
|
280
|
29
|
|
100
|
350
|
215
|
180
|
155
|
20
|
8-18
|
415
|
320
|
32.8
|
|
125
|
400
|
245
|
210
|
185
|
22
|
8-18
|
460
|
360
|
79.5
|
|
150
|
480
|
280
|
240
|
210
|
24
|
8-23
|
510
|
400
|
93
|
|
200
|
600
|
335
|
295
|
265
|
26
|
12-23
|
710
|
400
|
179
|
|
250
|
622
|
405
|
355
|
320
|
30
|
12-25
|
786
|
450
|
441
|
|
300
|
698
|
460
|
410
|
375
|
30
|
12-25
|
925
|
500
|
646
|
法兰式截止阀规格 主要尺寸和重量 Size Main Dimensions and Weight (mm kg)
2.5MPa
|
DN
|
L
|
D
|
D1
|
D2
|
b
|
n-φd
|
H
|
Do
|
重量 Weight
|
凸面法兰
RF J41H J41Y J41W J41F J41N 25C
25P 25R 25I |
10
|
130
|
90
|
60
|
40
|
16
|
4-14
|
198
|
120
|
4.9
|
15
|
130
|
95
|
65
|
45
|
16
|
4-14
|
218
|
120
|
5.3
|
|
20
|
150
|
105
|
75
|
55
|
16
|
4-14
|
258
|
140
|
7.0
|
|
25
|
160
|
115
|
85
|
65
|
16
|
4-14
|
275
|
160
|
7.4
|
|
32
|
180
|
135
|
100
|
78
|
18
|
4-18
|
280
|
180
|
8.3
|
|
40
|
200
|
145
|
110
|
85
|
18
|
4-18
|
330
|
200
|
12.6
|
|
50
|
230
|
160
|
125
|
100
|
20
|
8-18
|
350
|
240
|
16
|
|
65
|
290
|
180
|
145
|
120
|
22
|
8-18
|
400
|
280
|
25
|
|
80
|
310
|
195
|
160
|
135
|
22
|
8-23
|
355
|
280
|
30
|
|
100
|
350
|
230
|
190
|
160
|
24
|
8-25
|
415
|
320
|
34.8
|
|
125
|
400
|
270
|
220
|
188
|
28
|
8-25
|
460
|
360
|
89.5
|
|
150
|
480
|
300
|
250
|
218
|
30
|
12-25
|
510
|
400
|
99
|
|
200
|
600
|
360
|
310
|
278
|
34
|
12-25
|
710
|
400
|
181
|
|
250
|
622
|
425
|
370
|
332
|
36
|
12-30
|
786
|
450
|
445
|
|
300
|
698
|
485
|
430
|
390
|
40
|
16-30
|
925
|
500
|
651
|
法兰式截止阀规格 主要尺寸和重量 Size Main Dimensions and Weight (mm kg)
4.0MPa
|
DN
|
L
|
D
|
D1
|
D2
|
b
|
n-φd
|
H
|
D0
|
重量Weight
|
凹凸法兰 MFM
J41H J41Y J41W J41F J41N 40C 40P 40R 40I
|
20
|
150
|
105
|
75
|
51
|
16
|
4-14
|
275
|
140
|
7
|
25
|
160
|
115
|
85
|
58
|
16
|
4-14
|
285
|
160
|
9
|
|
32
|
180
|
135
|
100
|
66
|
18
|
4-18
|
302
|
180
|
12
|
|
40
|
200
|
145
|
110
|
76
|
18
|
4-18
|
355
|
200
|
17
|
|
50
|
230
|
160
|
125
|
88
|
20
|
4-18
|
373
|
240
|
24
|
|
65
|
290
|
180
|
145
|
110
|
22
|
8-18
|
408
|
280
|
33
|
|
80
|
310
|
195
|
160
|
121
|
22
|
8-18
|
436
|
320
|
44
|
|
100
|
350
|
230
|
190
|
150
|
24
|
8-23
|
480
|
360
|
60
|
|
125
|
400
|
270
|
220
|
176
|
28
|
8-25
|
588
|
400
|
90
|
|
150
|
480
|
300
|
250
|
204
|
30
|
8-25
|
611
|
400
|
100
|
|
200
|
533
|
375
|
320
|
260
|
38
|
12-30
|
720
|
400
|
190
|