名 稱: 對夾單瓣升降式止回閥
型 號: H71H
口 徑: DN15~400
壓 力: PN10~100
材 質(zhì): 鑄鋼、不銹鋼
產(chǎn)品名稱:H71對夾單瓣升降式止回閥
產(chǎn)品材料:WCB、CF3、CF8、CF3M、CF8M
產(chǎn)品規(guī)格:DN15~400、PN10~100
產(chǎn)品簡介:
H71對夾單瓣升降式止回閥
H71對夾單瓣升降式止回閥(國標(biāo))H71 wafer type lift check valve(GB standard)
公稱壓力
PN(MPa)
Norminal
pressure |
公稱通徑
DN(mm)
Norminal
diameter |
尺寸(mm)Dimension |
重量(kg)
Weight |
配管法蘭(供參考)
Flange(as referenced) |
L |
D |
D3 |
D2 |
螺栓孔中
心圓直徑D1
Diameter of the bolt |
螺栓數(shù)量
Quantity of
the bolt
|
螺栓直徑d
Diameter
of the bolt |
螺栓長度L1
Length of
the bolt |
4.0 |
15 |
16 |
52 |
15 |
44 |
0.12 |
65 |
4 |
M12 |
80 |
20 |
19 |
62 |
19 |
52 |
0.24 |
75 |
4 |
M12 |
90 |
25 |
22 |
72 |
24 |
60 |
0.34 |
85 |
4 |
M12 |
90 |
32 |
28 |
83 |
31 |
72 |
0.53 |
100 |
4 |
M16 |
110 |
40 |
31.5 |
93 |
39 |
74 |
0.80 |
110 |
4 |
M16 |
115 |
50 |
40 |
109 |
48 |
98 |
1.2 |
125 |
4 |
M16 |
125 |
65 |
46 |
129 |
63 |
117 |
2.2 |
145 |
8 |
M16 |
135 |
80 |
50 |
144 |
78 |
128 |
3.1 |
160 |
8 |
M16 |
145 |
100 |
60 |
168 |
98 |
/ |
9 |
190 |
8 |
M20 |
160 |
125 |
90 |
196 |
123 |
/ |
14 |
220 |
8 |
M24 |
205 |
150 |
106 |
224 |
148 |
/ |
18 |
250 |
8 |
M24 |
225 |
200 |
140 |
291 |
198 |
/ |
28 |
320 |
12 |
M27 |
275 |
250 |
160 |
353 |
248 |
/ |
42 |
385 |
12 |
M30 |
295 |
6.4 |
15 |
25 |
62 |
15 |
/ |
0.5 |
75 |
4 |
M12 |
100 |
20 |
31.5 |
73 |
19 |
/ |
0.7 |
90 |
4 |
M16 |
115 |
25 |
35.5 |
83 |
24 |
/ |
1.0 |
100 |
4 |
M16 |
130 |
32 |
40 |
89 |
31 |
/ |
1.3 |
110 |
4 |
M20 |
140 |
40 |
45 |
104 |
39 |
/ |
2.0 |
125 |
4 |
M20 |
150 |
50 |
56 |
114 |
48 |
/ |
3.2 |
135 |
4 |
M20 |
160 |
65 |
63 |
138 |
63 |
/ |
4.5 |
160 |
8 |
M20 |
170 |
80 |
71 |
148 |
78 |
/ |
5 |
170 |
8 |
M20 |
180 |
100 |
80 |
174 |
98 |
/ |
7 |
200 |
8 |
M24 |
200 |
125 |
110 |
211 |
123 |
/ |
13 |
240 |
8 |
M27 |
245 |
150 |
125 |
248 |
148 |
/ |
22 |
280 |
8 |
M30 |
270 |
200 |
160 |
310 |
198 |
/ |
40 |
345 |
8 |
M33 |
325 |
250 |
180 |
362 |
248 |
/ |
60 |
400 |
8 |
M33 |
350 |
10.0 |
15 |
25 |
62 |
15 |
/ |
0.6 |
75 |
4 |
M12 |
100 |
20 |
31.5 |
73 |
19 |
/ |
1.0 |
90 |
4 |
M16 |
115 |
25 |
35.5 |
83 |
24 |
/ |
1.3 |
100 |
4 |
M16 |
130 |
32 |
40 |
89 |
31 |
/ |
1.6 |
110 |
4 |
M20 |
140 |
40 |
45 |
104 |
39 |
/ |
2.5 |
125 |
4 |
M20 |
150 |
50 |
56 |
120 |
48 |
/ |
3.8 |
145 |
4 |
M24 |
172 |
65 |
63 |
144 |
63 |
/ |
6 |
170 |
8 |
M24 |
185 |
80 |
71 |
154 |
78 |
/ |
7 |
180 |
8 |
M24 |
195 |
100 |
80 |
181 |
98 |
/ |
10 |
210 |
8 |
M27 |
220 |
125 |
110 |
218 |
123 |
/ |
18 |
250 |
8 |
M30 |
265 |
150 |
125 |
258 |
148 |
/ |
30 |
290 |
12 |
M30 |
285 |
200 |
160 |
324 |
198 |
/ |
56 |
360 |
12 |
M33 |
345 |
250 |
180 |
392 |
248 |
/ |
70 |
430 |
12 |
M36 |
365 |
H71對夾式降式止回閥(美標(biāo))H71 wafer type lift check valve(ANSI standard)
壓力級
Pressure
rating |
口徑DN |
尺寸(mm)Dimension |
重量
(kg)
Weight |
配管法蘭(供參考)Flange(as referenced) |
NPS |
DN |
L |
D |
D3 |
D2 |
螺栓孔中
心圓直徑D1
Diameter of the bolt |
螺栓數(shù)量
Quantity of
the bolt |
螺栓直徑d
Diameter of the bolt |
螺栓長度L1
Length of
the bolt |
in |
mm |
Class150 |
1/2 |
15 |
16 |
46 |
15 |
44 |
0.12 |
60.5 |
4 |
1/2 |
M14 |
90 |
3/4 |
20 |
19 |
56 |
19 |
52 |
0.24 |
70 |
4 |
1/2 |
M14 |
100 |
/ |
25 |
22 |
65 |
24 |
60 |
0.34 |
79.5 |
4 |
1/2 |
M14 |
110 |
1 1/4 |
32 |
28 |
74 |
31 |
72 |
0.53 |
89 |
4 |
1/2 |
M14 |
120 |
1 1/2 |
40 |
31.5 |
84 |
39 |
74 |
0.80 |
98.5 |
4 |
1/2 |
M14 |
130 |
2 |
50 |
40 |
103 |
48 |
98 |
1.2 |
120.5 |
4 |
5/8 |
M16 |
145 |
2 1/2 |
65 |
46 |
122 |
63 |
117 |
2.2 |
139.5 |
4 |
5/8 |
M16 |
160 |
3 |
80 |
50 |
135 |
78 |
128 |
3.1 |
152.5 |
4 |
5/8 |
M16 |
170 |
4 |
100 |
60 |
173 |
98 |
- |
5.8 |
190.5 |
8 |
5/8 |
M16 |
180 |
5 |
125 |
90 |
195 |
123 |
- |
12 |
216.0 |
8 |
3/4 |
M20 |
210 |
6 |
150 |
106 |
220 |
148 |
- |
17 |
241.5 |
8 |
3/4 |
M20 |
230 |
8 |
200 |
140 |
277 |
198 |
- |
29 |
298.5 |
8 |
3/4 |
M20 |
270 |
10 |
250 |
160 |
337 |
248 |
- |
35 |
362.0 |
12 |
7/8 |
M24 |
290 |
Class300 |
1/2 |
15 |
25 |
52 |
15 |
- |
0.3 |
66.5 |
4 |
1/2 |
M14 |
100 |
3/4 |
20 |
31.5 |
65 |
19 |
- |
0.46 |
82.5 |
4 |
5/8 |
M16 |
110 |
/ |
25 |
35.5 |
72 |
24 |
- |
0.6 |
89 |
4 |
5/8 |
M16 |
120 |
1 1/4 |
32 |
40 |
81 |
31 |
- |
0.8 |
98.5 |
4 |
5/8 |
M16 |
130 |
1 1/2 |
40 |
45 |
94 |
39 |
- |
1.5 |
114.5 |
4 |
3/4 |
M20 |
140 |
2 |
50 |
56 |
110 |
48 |
- |
2.4 |
127.0 |
8 |
5/8 |
M16 |
150 |
2 1/2 |
65 |
63 |
128 |
63 |
- |
3.0 |
149.0 |
8 |
3/4 |
M20 |
170 |
3 |
80 |
71 |
148 |
78 |
- |
4.0 |
168.5 |
8 |
3/4 |
M20 |
190 |
4 |
100 |
80 |
179 |
98 |
- |
5.5 |
200.0 |
8 |
3/4 |
M20 |
200 |
5 |
125 |
110 |
214 |
123 |
- |
13 |
235.0 |
8 |
3/4 |
M20 |
240 |
6 |
150 |
125 |
249 |
148 |
- |
22 |
270.0 |
12 |
3/4 |
M20 |
260 |
8 |
200 |
160 |
305 |
198 |
- |
36 |
330.0 |
12 |
7/8 |
M24 |
310 |
10 |
250 |
180 |
359 |
248 |
- |
40 |
387.5 |
16 |
1 |
M27 |
330 |
Class600 |
1/2 |
15 |
25 |
52 |
15 |
- |
0.3 |
66.5 |
4 |
1/2 |
M14 |
100 |
3/4 |
20 |
31.5 |
65 |
19 |
- |
0.46 |
82.5 |
4 |
5/8 |
M16 |
110 |
/ |
25 |
35.5 |
72 |
24 |
- |
0.6 |
89.0 |
4 |
5/8 |
M16 |
120 |
1 1/4 |
32 |
40 |
81 |
31 |
- |
0.8 |
98.5 |
4 |
5/8 |
M16 |
130 |
1 1/2 |
40 |
45 |
94 |
39 |
- |
1.5 |
114.5 |
4 |
3/4 |
M20 |
140 |
2 |
50 |
56 |
110 |
48 |
- |
2.4 |
127.0 |
8 |
5/8 |
M16 |
150 |
2 1/2 |
65 |
63 |
128 |
63 |
- |
3.0 |
149.0 |
8 |
3/4 |
M20 |
170 |
3 |
80 |
71 |
147 |
78 |
- |
4.0 |
168.5 |
8 |
3/4 |
M20 |
190 |
4 |
100 |
80 |
191 |
98 |
- |
5.5 |
216.0 |
8 |
3/4 |
M24 |
200 |
5 |
125 |
110 |
239 |
123 |
- |
13 |
267.0 |
8 |
3/4 |
M27 |
240 |
6 |
150 |
125 |
264 |
148 |
- |
22 |
292.0 |
12 |
3/4 |
M27 |
290 |
8 |
200 |
160 |
318 |
198 |
- |
36 |
349.0 |
12 |
7/8 |
M30 |
350 |
10 |
250 |
180 |
398 |
248 |
- |
40 |
432.0 |
16 |
1 |
M33 |
370 |
Class900 |
1/2 |
15 |
25 |
62 |
25 |
15 |
0.6 |
82.5 |
4 |
3/4 |
M20 |
125 |
3/4 |
20 |
31.5 |
69 |
30 |
19 |
0.9 |
89.0 |
4 |
3/4 |
M20 |
135 |
1 |
25 |
35.5 |
77 |
36 |
24 |
1.2 |
101.5 |
4 |
7/8 |
M24 |
155 |
1 1/4 |
32 |
40 |
87 |
43 |
31 |
1.5 |
111.0 |
4 |
7/8 |
M24 |
160 |
1 1/2 |
40 |
45 |
97 |
52 |
39 |
2.0 |
124.0 |
4 |
1 |
M27 |
175 |
2 |
50 |
56 |
140 |
62 |
48 |
5.5 |
165.0 |
8 |
7/8 |
M24 |
195 |
2 1/2 |
65 |
63 |
162 |
75 |
62 |
7.5 |
190.5 |
8 |
1 |
M27 |
215 |
3 |
80 |
71 |
165 |
90 |
76 |
8 |
190.5 |
8 |
7/8 |
M24 |
210 |
4 |
100 |
80 |
204 |
112 |
95 |
14 |
235.0 |
8 |
1 1/8 |
M30 |
245 |
5 |
125 |
110 |
245 |
125 |
110 |
27 |
279.5 |
8 |
1 1/4 |
M33 |
290 |
6 |
150 |
125 |
286 |
150 |
127 |
41 |
317.5 |
12 |
1 1/8 |
M30 |
310 |
8 |
200 |
160 |
356 |
200 |
165 |
76 |
393.5 |
12 |
1 3/8 |
M36 |
375 |
產(chǎn)品材料:WCB、CF3、CF8、CF3M、CF8M
產(chǎn)品規(guī)格:DN15~400、PN10~100
產(chǎn)品簡介:
H71對夾升降式止回閥(國標(biāo))H71 wafer type lift check valve(GB standard)
公稱壓力
PN(MPa)
Norminal
pressure |
公稱通徑
DN(mm)
Norminal
diameter |
尺寸(mm)Dimension |
重量(kg)
Weight |
配管法蘭(供參考)
Flange(as referenced) |
L |
D |
D3 |
D2 |
螺栓孔中
心圓直徑D1
Diameter of the bolt |
螺栓數(shù)量
Quantity of
the bolt
|
螺栓直徑d
Diameter
of the bolt |
螺栓長度L1
Length of
the bolt |
4.0 |
15 |
16 |
52 |
15 |
44 |
0.12 |
65 |
4 |
M12 |
80 |
20 |
19 |
62 |
19 |
52 |
0.24 |
75 |
4 |
M12 |
90 |
25 |
22 |
72 |
24 |
60 |
0.34 |
85 |
4 |
M12 |
90 |
32 |
28 |
83 |
31 |
72 |
0.53 |
100 |
4 |
M16 |
110 |
40 |
31.5 |
93 |
39 |
74 |
0.80 |
110 |
4 |
M16 |
115 |
50 |
40 |
109 |
48 |
98 |
1.2 |
125 |
4 |
M16 |
125 |
65 |
46 |
129 |
63 |
117 |
2.2 |
145 |
8 |
M16 |
135 |
80 |
50 |
144 |
78 |
128 |
3.1 |
160 |
8 |
M16 |
145 |
100 |
60 |
168 |
98 |
/ |
9 |
190 |
8 |
M20 |
160 |
125 |
90 |
196 |
123 |
/ |
14 |
220 |
8 |
M24 |
205 |
150 |
106 |
224 |
148 |
/ |
18 |
250 |
8 |
M24 |
225 |
200 |
140 |
291 |
198 |
/ |
28 |
320 |
12 |
M27 |
275 |
250 |
160 |
353 |
248 |
/ |
42 |
385 |
12 |
M30 |
295 |
6.4 |
15 |
25 |
62 |
15 |
/ |
0.5 |
75 |
4 |
M12 |
100 |
20 |
31.5 |
73 |
19 |
/ |
0.7 |
90 |
4 |
M16 |
115 |
25 |
35.5 |
83 |
24 |
/ |
1.0 |
100 |
4 |
M16 |
130 |
32 |
40 |
89 |
31 |
/ |
1.3 |
110 |
4 |
M20 |
140 |
40 |
45 |
104 |
39 |
/ |
2.0 |
125 |
4 |
M20 |
150 |
50 |
56 |
114 |
48 |
/ |
3.2 |
135 |
4 |
M20 |
160 |
65 |
63 |
138 |
63 |
/ |
4.5 |
160 |
8 |
M20 |
170 |
80 |
71 |
148 |
78 |
/ |
5 |
170 |
8 |
M20 |
180 |
100 |
80 |
174 |
98 |
/ |
7 |
200 |
8 |
M24 |
200 |
125 |
110 |
211 |
123 |
/ |
13 |
240 |
8 |
M27 |
245 |
150 |
125 |
248 |
148 |
/ |
22 |
280 |
8 |
M30 |
270 |
200 |
160 |
310 |
198 |
/ |
40 |
345 |
8 |
M33 |
325 |
250 |
180 |
362 |
248 |
/ |
60 |
400 |
8 |
M33 |
350 |
10.0 |
15 |
25 |
62 |
15 |
/ |
0.6 |
75 |
4 |
M12 |
100 |
20 |
31.5 |
73 |
19 |
/ |
1.0 |
90 |
4 |
M16 |
115 |
25 |
35.5 |
83 |
24 |
/ |
1.3 |
100 |
4 |
M16 |
130 |
32 |
40 |
89 |
31 |
/ |
1.6 |
110 |
4 |
M20 |
140 |
40 |
45 |
104 |
39 |
/ |
2.5 |
125 |
4 |
M20 |
150 |
50 |
56 |
120 |
48 |
/ |
3.8 |
145 |
4 |
M24 |
172 |
65 |
63 |
144 |
63 |
/ |
6 |
170 |
8 |
M24 |
185 |
80 |
71 |
154 |
78 |
/ |
7 |
180 |
8 |
M24 |
195 |
100 |
80 |
181 |
98 |
/ |
10 |
210 |
8 |
M27 |
220 |
125 |
110 |
218 |
123 |
/ |
18 |
250 |
8 |
M30 |
265 |
150 |
125 |
258 |
148 |
/ |
30 |
290 |
12 |
M30 |
285 |
200 |
160 |
324 |
198 |
/ |
56 |
360 |
12 |
M33 |
345 |
250 |
180 |
392 |
248 |
/ |
70 |
430 |
12 |
M36 |
365 |
H71對夾式降式止回閥(美標(biāo))H71 wafer type lift check valve(ANSI standard)
壓力級
Pressure
rating |
口徑DN |
尺寸(mm)Dimension |
重量
(kg)
Weight |
配管法蘭(供參考)Flange(as referenced) |
NPS |
DN |
L |
D |
D3 |
D2 |
螺栓孔中
心圓直徑D1
Diameter of the bolt |
螺栓數(shù)量
Quantity of
the bolt |
螺栓直徑d
Diameter of the bolt |
螺栓長度L1
Length of
the bolt |
in |
mm |
Class150 |
1/2 |
15 |
16 |
46 |
15 |
44 |
0.12 |
60.5 |
4 |
1/2 |
M14 |
90 |
3/4 |
20 |
19 |
56 |
19 |
52 |
0.24 |
70 |
4 |
1/2 |
M14 |
100 |
/ |
25 |
22 |
65 |
24 |
60 |
0.34 |
79.5 |
4 |
1/2 |
M14 |
110 |
1 1/4 |
32 |
28 |
74 |
31 |
72 |
0.53 |
89 |
4 |
1/2 |
M14 |
120 |
1 1/2 |
40 |
31.5 |
84 |
39 |
74 |
0.80 |
98.5 |
4 |
1/2 |
M14 |
130 |
2 |
50 |
40 |
103 |
48 |
98 |
1.2 |
120.5 |
4 |
5/8 |
M16 |
145 |
2 1/2 |
65 |
46 |
122 |
63 |
117 |
2.2 |
139.5 |
4 |
5/8 |
M16 |
160 |
3 |
80 |
50 |
135 |
78 |
128 |
3.1 |
152.5 |
4 |
5/8 |
M16 |
170 |
4 |
100 |
60 |
173 |
98 |
- |
5.8 |
190.5 |
8 |
5/8 |
M16 |
180 |
5 |
125 |
90 |
195 |
123 |
- |
12 |
216.0 |
8 |
3/4 |
M20 |
210 |
6 |
150 |
106 |
220 |
148 |
- |
17 |
241.5 |
8 |
3/4 |
M20 |
230 |
8 |
200 |
140 |
277 |
198 |
- |
29 |
298.5 |
8 |
3/4 |
M20 |
270 |
10 |
250 |
160 |
337 |
248 |
- |
35 |
362.0 |
12 |
7/8 |
M24 |
290 |
Class300 |
1/2 |
15 |
25 |
52 |
15 |
- |
0.3 |
66.5 |
4 |
1/2 |
M14 |
100 |
3/4 |
20 |
31.5 |
65 |
19 |
- |
0.46 |
82.5 |
4 |
5/8 |
M16 |
110 |
/ |
25 |
35.5 |
72 |
24 |
- |
0.6 |
89 |
4 |
5/8 |
M16 |
120 |
1 1/4 |
32 |
40 |
81 |
31 |
- |
0.8 |
98.5 |
4 |
5/8 |
M16 |
130 |
1 1/2 |
40 |
45 |
94 |
39 |
- |
1.5 |
114.5 |
4 |
3/4 |
M20 |
140 |
2 |
50 |
56 |
110 |
48 |
- |
2.4 |
127.0 |
8 |
5/8 |
M16 |
150 |
2 1/2 |
65 |
63 |
128 |
63 |
- |
3.0 |
149.0 |
8 |
3/4 |
M20 |
170 |
3 |
80 |
71 |
148 |
78 |
- |
4.0 |
168.5 |
8 |
3/4 |
M20 |
190 |
4 |
100 |
80 |
179 |
98 |
- |
5.5 |
200.0 |
8 |
3/4 |
M20 |
200 |
5 |
125 |
110 |
214 |
123 |
- |
13 |
235.0 |
8 |
3/4 |
M20 |
240 |
6 |
150 |
125 |
249 |
148 |
- |
22 |
270.0 |
12 |
3/4 |
M20 |
260 |
8 |
200 |
160 |
305 |
198 |
- |
36 |
330.0 |
12 |
7/8 |
M24 |
310 |
10 |
250 |
180 |
359 |
248 |
- |
40 |
387.5 |
16 |
1 |
M27 |
330 |
Class600 |
1/2 |
15 |
25 |
52 |
15 |
- |
0.3 |
66.5 |
4 |
1/2 |
M14 |
100 |
3/4 |
20 |
31.5 |
65 |
19 |
- |
0.46 |
82.5 |
4 |
5/8 |
M16 |
110 |
/ |
25 |
35.5 |
72 |
24 |
- |
0.6 |
89.0 |
4 |
5/8 |
M16 |
120 |
1 1/4 |
32 |
40 |
81 |
31 |
- |
0.8 |
98.5 |
4 |
5/8 |
M16 |
130 |
1 1/2 |
40 |
45 |
94 |
39 |
- |
1.5 |
114.5 |
4 |
3/4 |
M20 |
140 |
2 |
50 |
56 |
110 |
48 |
- |
2.4 |
127.0 |
8 |
5/8 |
M16 |
150 |
2 1/2 |
65 |
63 |
128 |
63 |
- |
3.0 |
149.0 |
8 |
3/4 |
M20 |
170 |
3 |
80 |
71 |
147 |
78 |
- |
4.0 |
168.5 |
8 |
3/4 |
M20 |
190 |
4 |
100 |
80 |
191 |
98 |
- |
5.5 |
216.0 |
8 |
3/4 |
M24 |
200 |
5 |
125 |
110 |
239 |
123 |
- |
13 |
267.0 |
8 |
3/4 |
M27 |
240 |
6 |
150 |
125 |
264 |
148 |
- |
22 |
292.0 |
12 |
3/4 |
M27 |
290 |
8 |
200 |
160 |
318 |
198 |
- |
36 |
349.0 |
12 |
7/8 |
M30 |
350 |
10 |
250 |
180 |
398 |
248 |
- |
40 |
432.0 |
16 |
1 |
M33 |
370 |
Class900 |
1/2 |
15 |
25 |
62 |
25 |
15 |
0.6 |
82.5 |
4 |
3/4 |
M20 |
125 |
3/4 |
20 |
31.5 |
69 |
30 |
19 |
0.9 |
89.0 |
4 |
3/4 |
M20 |
135 |
1 |
25 |
35.5 |
77 |
36 |
24 |
1.2 |
101.5 |
4 |
7/8 |
M24 |
155 |
1 1/4 |
32 |
40 |
87 |
43 |
31 |
1.5 |
111.0 |
4 |
7/8 |
M24 |
160 |
1 1/2 |
40 |
45 |
97 |
52 |
39 |
2.0 |
124.0 |
4 |
1 |
M27 |
175 |
2 |
50 |
56 |
140 |
62 |
48 |
5.5 |
165.0 |
8 |
7/8 |
M24 |
195 |
2 1/2 |
65 |
63 |
162 |
75 |
62 |
7.5 |
190.5 |
8 |
1 |
M27 |
215 |
3 |
80 |
71 |
165 |
90 |
76 |
8 |
190.5 |
8 |
7/8 |
M24 |
210 |
4 |
100 |
80 |
204 |
112 |
95 |
14 |
235.0 |
8 |
1 1/8 |
M30 |
245 |
5 |
125 |
110 |
245 |
125 |
110 |
27 |
279.5 |
8 |
1 1/4 |
M33 |
290 |
6 |
150 |
125 |
286 |
150 |
127 |
41 |
317.5 |
12 |
1 1/8 |
M30 |
310 |
8 |
200 |
160 |
356 |
200 |
165 |
76 |
393.5 |
12 |
1 3/8 |
M36 |
375 |
H71對夾單瓣升降式止回閥