贯流式止回阀又称单向阀或逆止阀，启闭件靠介质流动和力量自行开启或关闭，以防止介质倒流的阀门叫止回阀。止回阀属于自动阀类，主要用于介质单向流动的管道上，只允许介质向一个方向流动，以防止发生事故。
贯流式止回阀主要特点：
1. 流线型流道，介质不绕流，阀门流阻小，节省能源。
2. 采用特殊密封结构，无论阀后压力的高低，阀门都关闭严密，密封性能好?？朔艘话阒够胤г诘捅逞故泵芊庑阅懿畹娜钡?。
3. 采用浮动的阀瓣结构，能自动补偿因安装和使用中磨损所引起的误差，保证密封面紧密贴合，提高了密封性能。
4. 启闭行程短，并能自动复位无冲击，在较小的流速下，阀门即可全开，关闭时间短。
5. 阀门不受安装位置限制，可以水平、垂直及任意角度安装。
主要零件材质及参数
|
产品材料
|
WCB系列
|
304系列
|
304L系列
|
316系列
|
316L系列
|
321系列
|
|
|
主要零件材料
|
阀体
|
WCB
|
CF8
|
CF3
|
CF8M
|
CF3M
|
0Cr18Ni10Ti
|
|
支架
|
WCB
|
CF8
|
CF3
|
CF8M
|
CF3M
|
0Cr18Ni10Ti
|
|
|
弹簧
|
304
|
304
|
316
|
316
|
316L
|
316
|
|
|
阀瓣
|
WCB
|
CF8
|
CF3
|
CF8M
|
CF3M
|
0Cr18Ni10Ti
|
|
|
适用工况
|
适用介质
|
水、油品、蒸汽
|
硝酸腐蚀性介质
|
醋酸腐蚀性介质
|
|||
|
适用温度
|
-29～425℃
|
-28～300℃
|
|||||
|
应用规范
|
设计制造按
|
GB/T12235
|
|||||
|
法兰尺寸按
|
HG 20592
|
||||||
|
检验试验按
|
JB/T 9092
|
||||||
|
公称压力
|
1.0～1.6MPa
|
||||||
PN1.6MPa 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
b
|
f
|
Z-φd
|
|
15
|
100
|
95
|
65
|
46
|
14
|
2
|
4-φ14
|
|
20
|
110
|
105
|
75
|
56
|
16
|
2
|
4-φ14
|
|
25
|
120
|
115
|
85
|
65
|
16
|
2
|
4-φ14
|
|
32
|
130
|
140
|
100
|
76
|
18
|
2
|
4-φ18
|
|
40
|
130
|
150
|
110
|
84
|
18
|
2
|
4-φ18
|
|
50
|
140
|
165
|
125
|
99
|
20
|
2
|
4-φ18
|
|
65
|
165
|
185
|
145
|
119
|
20
|
2
|
4-φ18
|
|
80
|
190
|
200
|
160
|
132
|
20
|
2
|
8-φ18
|
|
100
|
210
|
220
|
180
|
156
|
22
|
2
|
8-φ18
|
|
125
|
240
|
250
|
210
|
184
|
22
|
2
|
8-φ18
|
|
150
|
280
|
285
|
240
|
211
|
24
|
2
|
8-φ22
|
|
200
|
340
|
340
|
295
|
266
|
24
|
2
|
12-φ22
|
|
250
|
400
|
405
|
355
|
319
|
26
|
2
|
12-φ26
|
|
300
|
460
|
460
|
410
|
370
|
28
|
2
|
12-φ26
|
|
350
|
530
|
520
|
470
|
429
|
30
|
2
|
16-φ26
|
|
400
|
600
|
580
|
525
|
480
|
32
|
2
|
16-φ30
|
|
450
|
660
|
640
|
585
|
548
|
34
|
2
|
20-φ30
|
|
500
|
730
|
715
|
650
|
609
|
34
|
2
|
20-φ33
|
|
600
|
860
|
840
|
770
|
720
|
36
|
2
|
20-φ36
|
PN2.5MPa 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
b
|
f
|
Z-φd
|
|
15
|
100
|
95
|
65
|
46
|
14
|
2
|
4-φ14
|
|
20
|
110
|
105
|
75
|
56
|
16
|
2
|
4-φ14
|
|
25
|
120
|
115
|
85
|
65
|
16
|
2
|
4-φ14
|
|
32
|
130
|
140
|
100
|
76
|
18
|
2
|
4-φ18
|
|
40
|
130
|
150
|
110
|
84
|
18
|
2
|
4-φ18
|
|
50
|
140
|
165
|
125
|
99
|
20
|
2
|
4-φ18
|
|
65
|
165
|
185
|
145
|
118
|
22
|
2
|
8-φ18
|
|
80
|
190
|
200
|
160
|
132
|
24
|
2
|
8-φ18
|
|
100
|
210
|
235
|
190
|
156
|
24
|
2
|
8-φ22
|
|
125
|
240
|
270
|
220
|
184
|
26
|
2
|
8-φ26
|
|
150
|
280
|
300
|
250
|
211
|
28
|
2
|
8-φ26
|
|
200
|
340
|
360
|
310
|
274
|
30
|
2
|
12-φ26
|
|
250
|
400
|
425
|
370
|
330
|
32
|
2
|
12-φ30
|
|
300
|
460
|
485
|
430
|
389
|
34
|
2
|
16-φ30
|
|
350
|
530
|
555
|
490
|
448
|
38
|
2
|
16-φ33
|
|
400
|
600
|
620
|
550
|
503
|
40
|
2
|
16-φ36
|
|
450
|
660
|
670
|
600
|
548
|
42
|
2
|
20-φ36
|
|
500
|
730
|
730
|
660
|
609
|
44
|
2
|
20-φ36
|
|
600
|
860
|
845
|
770
|
720
|
46
|
2
|
20-φ39
|
PN4.0MPa 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
D6
|
f1
|
b
|
f
|
Z-φd
|
|
15
|
100
|
95
|
65
|
46
|
40
|
3
|
14
|
4
|
4-φ14
|
|
20
|
110
|
105
|
75
|
56
|
51
|
3
|
16
|
4
|
4-φ14
|
|
25
|
120
|
115
|
85
|
65
|
58
|
3
|
16
|
4
|
4-φ14
|
|
32
|
130
|
140
|
100
|
76
|
66
|
3
|
18
|
4
|
4-φ18
|
|
40
|
130
|
150
|
110
|
84
|
76
|
3
|
18
|
4
|
4-φ18
|
|
50
|
140
|
165
|
125
|
99
|
88
|
3
|
20
|
4
|
4-φ18
|
|
65
|
165
|
185
|
145
|
118
|
110
|
3
|
22
|
4
|
8-φ18
|
|
80
|
190
|
200
|
160
|
132
|
121
|
3
|
24
|
4
|
8-φ18
|
|
100
|
210
|
235
|
190
|
156
|
150
|
3.5
|
24
|
4.5
|
8-φ22
|
|
125
|
240
|
270
|
220
|
184
|
176
|
3.5
|
26
|
4.5
|
8-φ26
|
|
150
|
280
|
300
|
250
|
211
|
204
|
3.5
|
28
|
4.5
|
8-φ26
|
|
200
|
340
|
375
|
320
|
284
|
260
|
3.5
|
34
|
4.5
|
12-φ30
|
|
250
|
400
|
450
|
385
|
345
|
313
|
3.5
|
38
|
4.5
|
12-φ33
|
|
300
|
460
|
515
|
450
|
409
|
364
|
3.5
|
42
|
4.5
|
16-φ33
|
|
350
|
530
|
580
|
510
|
465
|
422
|
4
|
46
|
5
|
16-φ36
|
|
400
|
600
|
660
|
585
|
535
|
474
|
4
|
50
|
5
|
16-φ39
|
|
450
|
660
|
685
|
610
|
560
|
524
|
4
|
57
|
5
|
20-φ39
|
|
500
|
730
|
755
|
670
|
615
|
576
|
4
|
57
|
5
|
20-φ42
|
|
600
|
860
|
890
|
795
|
735
|
676
|
4
|
72
|
5
|
20-φ48
|
PN6.4MPa 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
D6
|
f1
|
b
|
f
|
Z-φd
|
|
15
|
120
|
105
|
75
|
46
|
40
|
3
|
20
|
4
|
4-φ14
|
|
20
|
140
|
130
|
90
|
56
|
51
|
3
|
20
|
4
|
4-φ18
|
|
25
|
150
|
140
|
100
|
65
|
58
|
3
|
24
|
4
|
4-φ18
|
|
32
|
170
|
155
|
110
|
76
|
66
|
3
|
24
|
4
|
4-φ22
|
|
40
|
180
|
170
|
125
|
84
|
76
|
3
|
26
|
4
|
4-φ22
|
|
50
|
190
|
180
|
135
|
99
|
88
|
3
|
26
|
4
|
4-φ22
|
|
65
|
210
|
205
|
160
|
118
|
110
|
3
|
26
|
4
|
8-φ22
|
|
80
|
240
|
215
|
170
|
132
|
121
|
3
|
28
|
4
|
8-φ22
|
|
100
|
290
|
250
|
200
|
156
|
150
|
3.5
|
30
|
4.5
|
8-φ26
|
|
125
|
330
|
295
|
240
|
184
|
176
|
3.5
|
34
|
4.5
|
8-φ30
|
|
150
|
350
|
345
|
280
|
211
|
204
|
3.5
|
36
|
4.5
|
8-φ33
|
|
200
|
430
|
415
|
345
|
284
|
260
|
3.5
|
42
|
4.5
|
12-φ36
|
|
250
|
510
|
470
|
400
|
345
|
313
|
3.5
|
46
|
4.5
|
12-φ36
|
|
300
|
570
|
530
|
460
|
409
|
364
|
3.5
|
52
|
4.5
|
16-φ36
|
|
350
|
650
|
600
|
525
|
465
|
422
|
4
|
56
|
5
|
16-φ39
|
|
400
|
710
|
670
|
585
|
535
|
474
|
4
|
60
|
5
|
16-φ42
|
PN10.0MPa 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
P
|
E
|
F
|
b
|
f
|
Z-φd
|
|
15
|
120
|
105
|
75
|
55
|
35
|
6.5
|
9
|
20
|
6.5
|
4-φ14
|
|
20
|
140
|
130
|
90
|
68
|
45
|
6.5
|
9
|
20
|
6.5
|
4-φ18
|
|
25
|
150
|
140
|
100
|
78
|
50
|
6.5
|
9
|
24
|
6.5
|
4-φ18
|
|
32
|
170
|
155
|
110
|
86
|
65
|
6.5
|
9
|
24
|
6.5
|
4-φ22
|
|
40
|
180
|
170
|
125
|
102
|
75
|
6.5
|
9
|
26
|
6.5
|
4-φ22
|
|
50
|
190
|
195
|
145
|
116
|
85
|
8
|
12
|
28
|
8
|
4-φ26
|
|
65
|
210
|
220
|
170
|
140
|
100
|
8
|
12
|
30
|
8
|
8-φ26
|
|
80
|
240
|
230
|
180
, |
150
|
115
|
8
|
12
|
32
|
8
|
8-φ26
|
|
100
|
290
|
265
|
210
|
176
|
145
|
8
|
12
|
36
|
8
|
8-φ30
|
|
125
|
330
|
315
|
250
|
212
|
175
|
8
|
12
|
40
|
8
|
8-φ33
|
|
150
|
350
|
355
|
290
|
250
|
205
|
8
|
12
|
44
|
8
|
12-φ33
|
|
200
|
430
|
430
|
360
|
312
|
265
|
8
|
12
|
52
|
8
|
12-φ36
|
|
250
|
510
|
505
|
430
|
376
|
320
|
8
|
12
|
60
|
8
|
12-φ39
|
|
300
|
570
|
585
|
500
|
448
|
375
|
8
|
12
|
68
|
8
|
16-φ42
|
|
350
|
650
|
655
|
560
|
505
|
420
|
11
|
17
|
74
|
11
|
16-φ48
|
|
400
|
710
|
715
|
620
|
565
|
480
|
11
|
17
|
82
|
11
|
16-φ48
|
PN16.0MPa 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
P
|
E
|
F
|
b
|
f
|
Z-φd
|
|
15
|
130
|
105
|
75
|
58
|
35
|
6.5
|
9
|
26
|
6.5
|
4-φ14
|
|
20
|
150
|
130
|
90
|
70
|
45
|
6.5
|
9
|
30
|
6.5
|
4-φ18
|
|
25
|
160
|
140
|
100
|
80
|
50
|
6.5
|
9
|
32
|
6.5
|
4-φ18
|
|
32
|
180
|
155
|
110
|
86
|
65
|
6.5
|
9
|
34
|
6.5
|
4-φ22
|
|
40
|
190
|
170
|
125
|
102
|
75
|
6.5
|
9
|
36
|
6.5
|
4-φ22
|
|
50
|
220
|
195
|
145
|
118
|
95
|
8
|
12
|
38
|
8
|
4-φ26
|
|
65
|
250
|
220
|
170
|
142
|
110
|
8
|
12
|
42
|
8
|
8-φ26
|
|
80
|
280
|
230
|
180
|
152
|
130
|
8
|
12
|
46
|
8
|
8-φ26
|
|
100
|
300
|
265
|
210
|
178
|
160
|
8
|
12
|
52
|
8
|
8-φ30
|
|
125
|
350
|
315
|
250
|
215
|
190
|
8
|
12
|
56
|
8
|
8-φ33
|
|
150
|
380
|
355
|
290
|
255
|
205
|
10
|
14
|
62
|
10
|
12-φ33
|
|
200
|
470
|
430
|
360
|
322
|
275
|
11
|
17
|
66
|
11
|
12-φ36
|
|
250
|
550
|
515
|
430
|
388
|
330
|
11
|
17
|
76
|
11
|
12-φ42
|
|
300
|
610
|
585
|
500
|
456
|
380
|
14
|
23
|
88
|
14
|
16-φ42
|
主要零件材质及参数
|
产品材料
|
WCB系列
|
304系列
|
304L系列
|
316系列
|
316L系列
|
321系列
|
|
|
主要零件材料
|
阀体
|
WCB
|
CF8
|
CF3
|
CF8M
|
CF3M
|
0Cr18Ni10Ti
|
|
支架
|
WCB
|
CF8
|
CF3
|
CF8M
|
CF3M
|
0Cr18Ni10Ti
|
|
|
弹簧
|
304
|
304
|
316
|
316
|
316L
|
316
|
|
|
阀瓣
|
WCB
|
CF8
|
CF3
|
CF8M
|
CF3M
|
0Cr18Ni10Ti
|
|
|
适用工况
|
适用介质
|
水、油品、蒸汽
|
硝酸腐蚀性介质
|
醋酸腐蚀性介质
|
|||
|
适用温度
|
-29～425℃
|
-28～300℃
|
|||||
|
应用规范
|
设计制造按
|
API 600
|
|||||
|
法兰尺寸按
|
ANSI B16.5
|
||||||
|
检验试验按
|
API 598
|
||||||
|
公称压力
|
150LB～900LB
|
||||||
150LB 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
b
|
f
|
Z-φd
|
|
1/2"
|
100
|
90
|
60.5
|
35
|
11.2
|
1.6
|
4-φ16
|
|
3/4"
|
110
|
100
|
70
|
43
|
11.2
|
1.6
|
4-φ16
|
|
1"
|
120
|
110
|
79.5
|
51
|
12
|
1.6
|
4-φ16
|
|
11/4"
|
130
|
115
|
89
|
63.5
|
13.5
|
1.6
|
4-φ16
|
|
11/2"
|
130
|
125
|
98.5
|
73
|
15
|
1.6
|
4-φ16
|
|
2"
|
140
|
150
|
120.5
|
92
|
15.9
|
1.6
|
4-φ18
|
|
21/2"
|
165
|
180
|
139.5
|
105
|
17.5
|
1.6
|
4-φ18
|
|
3"
|
190
|
190
|
152.5
|
127
|
19.1
|
1.6
|
4-φ18
|
|
4"
|
210
|
230
|
190.5
|
157
|
23.9
|
1.6
|
8-φ18
|
|
5"
|
240
|
255
|
216
|
186
|
23.9
|
1.6
|
8-φ22
|
|
6"
|
280
|
280
|
241.5
|
216
|
25.4
|
1.6
|
8-φ22
|
|
8"
|
340
|
345
|
298.5
|
270
|
28.6
|
1.6
|
8-φ22
|
|
10"
|
400
|
405
|
362
|
324
|
30.2
|
1.6
|
12-φ26
|
|
12"
|
460
|
485
|
432
|
381
|
31.8
|
1.6
|
12-φ26
|
|
14"
|
530
|
535
|
476
|
413
|
35
|
1.6
|
12-φ30
|
|
16"
|
600
|
595
|
540
|
470
|
36.6
|
1.6
|
16-φ30
|
|
18"
|
660
|
635
|
578
|
533.5
|
39.7
|
1.6
|
16-φ33
|
|
20"
|
730
|
700
|
635
|
584
|
42.9
|
1.6
|
20-φ33
|
|
24"
|
860
|
815
|
749.5
|
692
|
47.7
|
1.6
|
20-φ36
|
300LB 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
b
|
f
|
Z-φd
|
|
1/2"
|
100
|
95
|
66.5
|
35
|
15
|
1.6
|
4-φ16
|
|
3/4"
|
110
|
115
|
82.5
|
43
|
16
|
1.6
|
4-φ18
|
|
1"
|
120
|
125
|
89
|
51
|
18
|
1.6
|
4-φ18
|
|
11/4"
|
130
|
135
|
98.5
|
63.5
|
19.5
|
1.6
|
4-φ18
|
|
11/2"
|
130
|
155
|
114.5
|
73
|
21
|
1.6
|
4-φ22
|
|
2"
|
140
|
165
|
127
|
92
|
22.3
|
1.6
|
8-φ18
|
|
21/2"
|
165
|
190
|
149
|
105
|
25.4
|
1.6
|
8-φ22
|
|
3"
|
190
|
210
|
168.5
|
127
|
28.6
|
1.6
|
8-φ22
|
|
4"
|
210
|
255
|
200
|
157
|
31.8
|
1.6
|
8-φ22
|
|
5"
|
290
|
280
|
235
|
186
|
35
|
1.6
|
8-φ22
|
|
6"
|
320
|
320
|
270
|
216
|
36.6
|
1.6
|
12-φ22
|
|
8"
|
400
|
380
|
330
|
270
|
41.3
|
1.6
|
12-φ26
|
|
10"
|
460
|
445
|
387
|
324
|
47.7
|
1.6
|
16-φ30
|
|
12"
|
550
|
520
|
451
|
381
|
50.8
|
1.6
|
16-φ33
|
|
14"
|
600
|
585
|
514.5
|
413
|
54
|
1.6
|
20-φ33
|
|
16"
|
680
|
650
|
571.5
|
470
|
57.2
|
1.6
|
20-φ36
|
|
18"
|
800
|
710
|
628.5
|
533.5
|
60.4
|
1.6
|
24-φ36
|
|
20"
|
900
|
775
|
686
|
584
|
63.5
|
1.6
|
24-φ36
|
|
24"
|
1100
|
915
|
813
|
692
|
69.9
|
1.6
|
24-φ42
|
600LB 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
b
|
f
|
Z-φd
|
|
1/2"
|
120
|
95
|
66.5
|
35
|
15
|
6.4
|
4-φ16
|
|
3/4"
|
140
|
115
|
82.5
|
43
|
16
|
6.4
|
4-φ18
|
|
1"
|
150
|
125
|
89
|
51
|
18
|
6.4
|
4-φ18
|
|
11/4"
|
170
|
135
|
98.5
|
63.5
|
21
|
6.4
|
4-φ18
|
|
11/2"
|
180
|
155
|
114.5
|
73
|
23
|
6.4
|
4-φ22
|
|
2"
|
190
|
165
|
127
|
92
|
25.4
|
6.4
|
8-φ18
|
|
21/2"
|
210
|
190
|
149
|
105
|
28.6
|
6.4
|
8-φ22
|
|
3"
|
240
|
210
|
168.5
|
127
|
31.8
|
6.4
|
8-φ22
|
|
4"
|
290
|
275
|
216
|
157
|
38.1
|
6.4
|
8-φ26
|
|
5"
|
330
|
330
|
267
|
186
|
44.5
|
6.4
|
8-φ30
|
|
6"
|
350
|
355
|
292
|
216
|
47.7
|
6.4
|
12-φ30
|
|
8"
|
430
|
420
|
349
|
270
|
55.6
|
6.4
|
12-φ33
|
|
10"
|
510
|
510
|
432
|
324
|
63.5
|
6.4
|
16-φ36
|
|
12"
|
570
|
560
|
489
|
381
|
66.7
|
6.4
|
20-φ36
|
|
14"
|
650
|
605
|
527
|
413
|
69.9
|
6.4
|
20-φ39
|
|
16"
|
710
|
685
|
603
|
470
|
76.2
|
6.4
|
20-φ42
|
|
18"
|
800
|
745
|
654
|
533.5
|
83
|
6.4
|
20-φ45
|
|
20"
|
940
|
815
|
724
|
584
|
89
|
6.4
|
24-φ45
|
|
24"
|
1100
|
940
|
838
|
692
|
102
|
6.4
|
24-φ52
|
900LB 连接尺寸
|
DN
|
L
|
D
|
D1
|
D2
|
P
|
E
|
F
|
b
|
f
|
Z-φd
|
|
1/2"
|
130
|
120
|
82.5
|
60.5
|
39.67
|
6.35
|
8.74
|
22.5
|
6.35
|
4-φ22
|
|
3/4"
|
150
|
130
|
89
|
66.5
|
44.45
|
6.35
|
8.74
|
25.5
|
6.35
|
4-φ22
|
|
1"
|
160
|
150
|
101.5
|
71.5
|
50.8
|
6.35
|
8.74
|
29
|
6.35
|
4-φ26
|
|
11/4"
|
180
|
160
|
111
|
81
|
60.33
|
6.35
|
8.74
|
29
|
6.35
|
4-φ26
|
|
11/2"
|
190
|
180
|
124
|
92
|
68.27
|
6.35
|
8.74
|
32
|
6.35
|
4-φ30
|
|
2"
|
220
|
215
|
165
|
124
|
95.25
|
7.92
|
11.91
|
38.5
|
7.92
|
8-φ26
|
|
21/2"
|
250
|
245
|
190.5
|
137
|
107.95
|
7.92
|
11.91
|
41.5
|
7.92
|
8-φ30
|
|
3"
|
280
|
240
|
190.5
|
156
|
123.83
|
7.92
|
11.91
|
38.5
|
7.92
|
8-φ26
|
|
4"
|
300
|
290
|
235
|
181
|
149.2
|
7.92
|
11.91
|
44.5
|
7.92
|
8-φ33
|
|
5"
|
350
|
350
|
279.5
|
216
|
190.98
|
7.92
|
11.91
|
51
|
7.92
|
8-φ36
|
|
6"
|
380
|
380
|
317.5
|
241
|
212.12
|
7.92
|
11.91
|
56
|
7.92
|
12-φ33
|
|
8"
|
470
|
470
|
393.7
|
308
|
269.88
|
7.92
|
11.91
|
63.5
|
7.92
|
12-φ39
|
|
10"
|
550
|
545
|
469.9
|
362
|
323.85
|
7.92
|
11.91
|
70
|
7.92
|
16-φ39
|
|
12"
|
610
|
610
|
533.4
|
419
|
381
|
7.92
|
11.91
|
79.5
|
7.92
|
20-φ39
|
|
14"
|
680
|
640
|
558.8
|
467
|
419.1
|
11.13
|
16.66
|
86
|
11.13
|
20-φ42
|
|
16"
|
770
|
705
|
615.9
|
524
|
469.9
|
11.13
|
16.66
|
89
|
11.13
|
20-φ45
|
|
18"
|
870
|
785
|
685.8
|
594
|
533.4
|
12.70
|
19.84
|
102
|
12.70
|
20-φ52
|
|
20"
|
1000
|
855
|
749.3
|
648
|
584.2
|
12.70
|
19.84
|
108
|
12.70
|
24-φ56
|
|
24"
|
1300
|
1040
|
901.7
|
772
|
692.15
|
15.88
|
26.97
|
140
|
15.88
|
24-φ68
|
