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動。閥桿的運動形式，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
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設(shè)計與制造 Design and Manufacture
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結(jié)構(gòu)長度
Face To Face |
法蘭尺寸
Flange Dimension |
壓力-溫度 Pressure Temperature Lating
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試驗-檢驗 Inspection And Test
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GB122235
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GB12221
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GB9113 JB79
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GB9131
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GB/T13927 JB/T9092
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法蘭式截止閥壓力試驗 Pressure Test
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公稱壓力NominalPressure
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1.6
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2.5
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4.0
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6.4
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10.0
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16.0
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強(qiáng)度試驗 Shell Test
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2.4
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3.8
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6.0
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9.6
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15.0
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24.0
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水密封試驗 Water Seal Test
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1.8
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2.8
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4.4
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7.0
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11.0
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18.0
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上密封試驗Backseat Test
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1.8
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2.8
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4.4
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7.0
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11.0
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18.0
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氣密封試驗 Air Seal Test
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0.5-0.7
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法蘭式截止閥主要零件材料及性能 Main Part Materials and Property
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體、蓋、板 Body Cover Disc
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閥桿
Stem |
密封面 Sealing Face
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墊片
Sealing Shim |
填料
Packing |
工作溫度℃ Working Temperature
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適用介質(zhì)Suitable Medium
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WCB
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2Cr13
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13Cr
STL
木體材料
With Body
Material
尼龍
Nylon
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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
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柔性石墨
增強(qiáng)柔性石墨
Flexible Graphite
Enhanced Flexible Graphite
SFB/260
SFP/260
PTFE
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≤425
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水
蒸汽
油品
Water
Steam
Petroleum
Ptoducts
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WC1
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38CrMoAl
25Cr2MoV
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≤450
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WC6
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≤540
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WC9
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≤570
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C5 C12
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≤540
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ZGCr5Mo
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≤200
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硝酸類Nitric acid
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|||||
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ZG1Cr18Ni9Ti
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1Cr18Ni9Ti
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||||||
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≤200
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醋酸類Acetic acid
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ZG1Cr18Ni12Mo2Ti
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1Cr18Ni12Mo2Ti
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法蘭式截止閥規(guī)格 主要尺寸和重量 Size Main Dimensions and Weight (mm kg)
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1.6MPa
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DN
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L
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D
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D1
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D2
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b
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n-φd
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H
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Do
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重量 Weight
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凸面
法蘭
RF J41H J41Y J41W J41F J41N 16C
16P 16R 16I |
10
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130
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90
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60
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40
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14
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4-14
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198
|
120
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4.9
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|
15
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130
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95
|
65
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45
|
14
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4-14
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218
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120
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5.3
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|
|
20
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150
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105
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75
|
55
|
14
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4-14
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258
|
140
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7.0
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|
|
25
|
160
|
115
|
85
|
65
|
14
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4-14
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275
|
160
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7.4
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|
|
32
|
180
|
135
|
100
|
78
|
16
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4-18
|
280
|
180
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8.3
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|
|
40
|
200
|
145
|
110
|
85
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16
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4-18
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330
|
200
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12.6
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|
|
50
|
230
|
160
|
125
|
100
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16
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4-18
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350
|
240
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14
|
|
|
65
|
290
|
180
|
145
|
120
|
18
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4-18
|
400
|
280
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22.7
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|
|
80
|
310
|
195
|
160
|
135
|
20
|
8-18
|
355
|
280
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29
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|
|
100
|
350
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215
|
180
|
155
|
20
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8-18
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415
|
320
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32.8
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|
|
125
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400
|
245
|
210
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185
|
22
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8-18
|
460
|
360
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79.5
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|
|
150
|
480
|
280
|
240
|
210
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24
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8-23
|
510
|
400
|
93
|
|
|
200
|
600
|
335
|
295
|
265
|
26
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12-23
|
710
|
400
|
179
|
|
|
250
|
622
|
405
|
355
|
320
|
30
|
12-25
|
786
|
450
|
441
|
|
|
300
|
698
|
460
|
410
|
375
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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)
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2.5MPa
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DN
|
L
|
D
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D1
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D2
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b
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n-φd
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H
|
Do
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重量 Weight
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|
凸面法蘭
RF J41H J41Y J41W J41F J41N 25C
25P 25R 25I |
10
|
130
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90
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60
|
40
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16
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4-14
|
198
|
120
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4.9
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|
15
|
130
|
95
|
65
|
45
|
16
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4-14
|
218
|
120
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5.3
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|
|
20
|
150
|
105
|
75
|
55
|
16
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4-14
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258
|
140
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7.0
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|
|
25
|
160
|
115
|
85
|
65
|
16
|
4-14
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275
|
160
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7.4
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|
|
32
|
180
|
135
|
100
|
78
|
18
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4-18
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280
|
180
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8.3
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|
|
40
|
200
|
145
|
110
|
85
|
18
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4-18
|
330
|
200
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12.6
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|
|
50
|
230
|
160
|
125
|
100
|
20
|
8-18
|
350
|
240
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16
|
|
|
65
|
290
|
180
|
145
|
120
|
22
|
8-18
|
400
|
280
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25
|
|
|
80
|
310
|
195
|
160
|
135
|
22
|
8-23
|
355
|
280
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30
|
|
|
100
|
350
|
230
|
190
|
160
|
24
|
8-25
|
415
|
320
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34.8
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|
|
125
|
400
|
270
|
220
|
188
|
28
|
8-25
|
460
|
360
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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
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法蘭式截止閥規(guī)格 主要尺寸和重量 Size Main Dimensions and Weight (mm kg)
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4.0MPa
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DN
|
L
|
D
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D1
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D2
|
b
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n-φd
|
H
|
D0
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重量Weight
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|
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
|