止回閥又稱逆止閥、單向閥、逆流閥、和背壓閥。止回閥用于管路系統,靠管路中介質本身的流動產生的力自動開啟和關閉的,屬于一種自動閥門,其主要作用是防止介質倒流、防止泵及驅動電動機反轉,以及容器介質的泄放。止回閥還可用于給其中的壓力可能升至超過系統壓的輔助系統提供補給的管路上。止回閥主要可分為旋啟式止回閥(依重心旋轉)與升降式止回閥(沿軸線移動)。
規格 主要尺寸
1.6MPa |
DN |
L |
D |
D1 |
D2 |
b |
n-φd |
H |
RF |
15 |
130 |
95 |
65 |
45 |
14 |
4-φ14 |
77 |
20 |
150 |
105 |
75 |
55 |
14 |
4-φ14 |
77 | |
25 |
160 |
115 |
85 |
65 |
14 |
4-φ14 |
80 | |
32 |
180 |
135 |
100 |
78 |
16 |
4-φ18 |
85 | |
40 |
200 |
145 |
110 |
85 |
16 |
4-φ18 |
95 | |
50 |
230 |
160 |
125 |
100 |
16 |
4-φ18 |
105 | |
65 |
290 |
180 |
145 |
120 |
18 |
4-φ18 |
120 | |
80 |
310 |
195 |
160 |
135 |
20 |
8-φ18 |
130 | |
100 |
350 |
215 |
180 |
155 |
20 |
8-φ18 |
140 | |
125 |
400 |
245 |
210 |
185 |
22 |
8-φ18 |
155 | |
150 |
480 |
280 |
240 |
210 |
24 |
8-φ23 |
180 | |
200 |
600 |
335 |
295 |
265 |
26 |
12-φ23 |
215 | |
250 |
730 |
405 |
355 |
320 |
30 |
12-φ25 |
260 | |
300 |
850 |
460 |
410 |
375 |
30 |
12-φ25 |
315 | |
400 |
1100 |
580 |
525 |
485 |
36 |
16-φ30 |
- | |
500 |
1250 |
705 |
650 |
608 |
44 |
20-φ34 |
- | |
2.5MPa |
15 |
130 |
95 |
65 |
45 |
16 |
4-φ14 |
100 |
RF |
20 |
150 |
105 |
75 |
55 |
16 |
4-φ14 |
105 |
25 |
160 |
115 |
85 |
65 |
16 |
4-φ14 |
120 | |
32 |
180 |
135 |
100 |
78 |
18 |
4-φ18 |
130 | |
40 |
200 |
145 |
110 |
85 |
18 |
4-φ18 |
135 | |
50 |
230 |
160 |
125 |
100 |
20 |
4-φ18 |
149 | |
65 |
290 |
180 |
145 |
120 |
22 |
8-φ18 |
160 | |
80 |
310 |
195 |
160 |
135 |
22 |
8-φ18 |
169 | |
100 |
350 |
230 |
190 |
160 |
24 |
8-φ23 |
194 | |
125 |
400 |
270 |
220 |
188 |
28 |
8-φ25 |
222 | |
150 |
480 |
300 |
250 |
218 |
30 |
8-φ25 |
255 | |
200 |
600 |
360 |
310 |
278 |
34 |
12-φ25 |
305 | |
250 |
730 |
425 |
370 |
332 |
36 |
12-φ30 |
355 | |
300 |
850 |
485 |
430 |
390 |
40 |
16-φ30 |
410 | |
400 |
1100 |
580 |
525 |
485 |
36 |
16-φ30 |
- | |
500 |
1250 |
705 |
650 |
608 |
44 |
20-φ34 |
- |
規格 主要尺寸
4.OMPa |
DN |
L |
D |
D1 |
D2 |
D6 |
b |
n-φd |
H |
凹凸法蘭 |
15 |
130 |
95 |
65 |
45 |
40 |
16 |
4-φ14 |
100 |
20 |
150 |
105 |
75 |
55 |
51 |
16 |
4-φ14 |
105 | |
25 |
160 |
115 |
85 |
65 |
58 |
16 |
4-φ14 |
120 | |
32 |
180 |
135 |
100 |
78 |
66 |
18 |
4-φ18 |
130 | |
40 |
200 |
145 |
110 |
85 |
76 |
18 |
4-φ18 |
135 | |
50 |
230 |
160 |
125 |
100 |
88 |
20 |
4-φ18 |
149 | |
65 |
290 |
180 |
145 |
120 |
110 |
22 |
8-φ18 |
164 | |
80 |
310 |
195 |
160 |
135 |
121 |
22 |
8-φ18 |
169 | |
100 |
350 |
230 |
190 |
160 |
150 |
24 |
8-φ23 |
194 | |
125 |
400 |
270 |
220 |
188 |
176 |
28 |
8-φ25 |
225 | |
150 |
480 |
300 |
250 |
218 |
204 |
30 |
8-φ25 |
255 | |
200 |
600 |
375 |
320 |
282 |
260 |
38 |
12-φ30 |
305 | |
250 |
730 |
445 |
385 |
345 |
313 |
42 |
12-φ34 |
360 | |
300 |
850 |
510 |
450 |
408 |
364 |
46 |
16-φ34 |
415 | |
350 |
980 |
570 |
510 |
465 |
422 |
52 |
16-φ41 |
- | |
400 |
1100 |
655 |
585 |
535 |
474 |
58 |
20-φ48 |
- | |
450 |
1200 |
680 |
61O |
560 |
524 |
60 |
20-φ41 |
- | |
500 |
1250 |
755 |
670 |
612 |
576 |
62 |
20-φ54 |
- | |
6.4MPa |
15 |
210 |
105 |
75 |
55 |
40 |
18 |
4-φ14 |
100 |
MFM |
20 |
230 |
125 |
90 |
68 |
51 |
20 |
4-φ18 |
110 |
25 |
230 |
135 |
100 |
78 |
58 |
22 |
4-φ18 |
125 | |
32 |
260 |
150 |
110 |
82 |
66 |
24 |
4-φ23 |
152 | |
40 |
260 |
165 |
125 |
95 |
76 |
24 |
4-φ23 |
168 | |
50 |
300 |
175 |
135 |
105 |
88 |
26 |
4-φ23 |
170 | |
65 |
340 |
200 |
160 |
130 |
110 |
28 |
8-φ23 |
188 | |
80 |
380 |
210 |
170 |
140 |
121 |
30 |
8-φ23 |
205 | |
100 |
430 |
250 |
200 |
168 |
150 |
32 |
8-φ25 |
230 | |
125 |
500 |
295 |
240 |
202 |
176 |
36 |
8-φ30 |
245 | |
150 |
550 |
340 |
280 |
240 |
204 |
38 |
8-φ34 |
265 | |
200 |
650 |
405 |
345 |
300 |
260 |
44 |
12-φ34 |
310 | |
250 |
775 |
470 |
400 |
352 |
313 |
48 |
12-φ41 |
445 | |
300 |
900 |
530 |
460 |
412 |
364 |
54 |
16-φ41 |
474 | |
350 |
1025 |
595 |
525 |
475 |
422 |
60 |
16-φ41 |
514 | |
400 |
1150 |
670 |
585 |
525 |
474 |
66 |
16-φ48 |
616 | |
10.0MPa |
15 |
210 |
105 |
75 |
55 |
40 |
20 |
4-φ14 |
100 |
MFM |
20 |
230 |
125 |
90 |
68 |
51 |
22 |
4-φ18 |
110 |
25 |
230 |
135 |
100 |
78 |
58 |
24 |
4-φ18 |
125 | |
32 |
260 |
150 |
110 |
82 |
66 |
24 |
4-φ23 |
140 | |
40 |
260 |
165 |
125 |
95 |
76 |
26 |
4-φ23 |
168 | |
50 |
300 |
195 |
145 |
112 |
88 |
28 |
4-φ25 |
170 | |
65 |
340 |
220 |
170 |
138 |
110 |
32 |
8-φ25 |
188 | |
80 |
380 |
230 |
180 |
148 |
121 |
34 |
8-φ25 |
205 | |
100 |
430 |
265 |
210 |
172 |
150 |
38 |
8-φ30 |
230 | |
125 |
500 |
310 |
250 |
210 |
176 |
42 |
8-φ34 |
245 | |
150 |
550 |
350 |
290 |
250 |
204 |
46 |
12-φ34 |
265 | |
200 |
650 |
430 |
360 |
312 |
260 |
54 |
12-1 |
402 | |
250 |
775 |
500 |
430 |
382 |
313 |
60 |
12-41 |
432 | |
300 |
900 |
585 |
500 |
442 |
364 |
70 |
16-48 |
484 | |
350 |
1025 |
655 |
560 |
498 |
422 |
76 |
16-54 |
- | |
400 |
1150 |
715 |
620 |
558 |
474 |
80 |
16-54 |
- |