截止閥的啟閉件是塞形的閥瓣，密封面呈平面或錐面，閥瓣沿流體的中心線作直線運(yùn)動。閥桿的運(yùn)動形式，有升降桿式（閥桿升降，手輪不升降），也有升降旋轉(zhuǎn)桿式（手輪與閥桿一起旋轉(zhuǎn)升降，螺母設(shè)在閥體上）。截止閥只適用于全開和全關(guān)，不允許作調(diào)節(jié)和節(jié)流。
截止閥屬于強(qiáng)制密封式閥門，所以在閥門關(guān)閉時，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，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，否則會發(fā)生閥桿頂彎的故障。近年來，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，在介質(zhì)作用下，這種形式的閥門也較嚴(yán)密。我國閥門“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，閥瓣的開啟高度，為公稱直徑的25%～30%時，流量已達(dá)到較 大，表示閥門已達(dá)全開位置。所以截止閥的全開位置，應(yīng)由閥瓣的行程來決定。
法蘭式截止閥執(zhí)行標(biāo)準(zhǔn) Administer Standard
|
設(shè)計與制造 Design and Manufacture
|
結(jié)構(gòu)長度
Face To Face |
法蘭尺寸
Flange Dimension |
壓力-溫度 Pressure Temperature Lating
|
試驗-檢驗 Inspection And Test
|
|
GB122235
|
GB12221
|
GB9113 JB79
|
GB9131
|
GB/T13927 JB/T9092
|
法蘭式截止閥壓力試驗 Pressure Test
|
公稱壓力NominalPressure
|
1.6
|
2.5
|
4.0
|
6.4
|
10.0
|
16.0
|
|
強(qiáng)度試驗 Shell Test
|
2.4
|
3.8
|
6.0
|
9.6
|
15.0
|
24.0
|
|
水密封試驗 Water Seal Test
|
1.8
|
2.8
|
4.4
|
7.0
|
11.0
|
18.0
|
|
上密封試驗Backseat Test
|
1.8
|
2.8
|
4.4
|
7.0
|
11.0
|
18.0
|
|
氣密封試驗 Air Seal Test
|
0.5-0.7
|
|||||
法蘭式截止閥主要零件材料及性能 Main Part Materials and Property
|
體、蓋、板 Body Cover Disc
|
閥桿
Stem |
密封面 Sealing Face
|
墊片
Sealing Shim |
填料
Packing |
工作溫度℃ Working Temperature
|
適用介質(zhì)Suitable Medium
|
|
|
WCB
|
2Cr13
|
13Cr
STL
木體材料
With Body
Material
尼龍
Nylon
|
增強(qiáng)柔性石墨
Enhanced Flexible Graphite
13Cr/柔性石墨
1Cr13/Flexible Graphite
08軟鋼
08 Soft Steal
0Cr18Ni9Ti
0Cr17Ni12Mo2Ti
XD550F(T)
PTFE
|
柔性石墨
增強(qiáng)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
|
硝酸類Nitric acid
|
|||||
|
ZG1Cr18Ni9Ti
|
1Cr18Ni9Ti
|
||||||
|
≤200
|
醋酸類Acetic acid
|
||||||
|
ZG1Cr18Ni12Mo2Ti
|
1Cr18Ni12Mo2Ti
|
法蘭式截止閥規(guī)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
法蘭
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
|
法蘭式截止閥規(guī)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
|
|
凸面法蘭
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
|
法蘭式截止閥規(guī)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
|
|
凹凸法蘭 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
|