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Zhinuo Valve (Zhejiang) Co., Ltd
H76H clamp type double disc check valve
NegotiableUpdate on 02/03
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Overview
H76H clamp type double disc check valve is suitable for nominal pressure PN1.0MPa~420MPa, Classl 50~2500; On various pipelines with nominal diameter of DN15-1200mm and NPsl/2-48. Operating temperature range of 196-540 ℃, it is used to prevent medium cross flow. By selecting different materials, it can be suitable for various media such as water, steam, oil, nitric acid, strong oxidizing media, and urea.
Product Details
H76H clamp type double disc check valveSuitable for nominal pressure PN1.0MPa~420MPa, Classl50~2500; On various pipelines with nominal diameter of DN15-1200mm and NPsl/2-48. Operating temperature range of 196-540 ℃, it is used to prevent medium cross flow. By selecting different materials, it can be suitable for various media such as water, steam, oil, nitric acid, strong oxidizing media, and urea.
Standards and specifications:
1. Design secret manufacturing: APl594, AP 6D, JB, T8937;
2. Structural length: API594, APl60, DlN3202, JB/T8937,
3. Pressure and temperature level? ANsIBl6.34、DlN2401、GB／T 9124、HG20604、HG20625、SH3406、JB，T74，
4. Testing and Inspection AP 598, JB/T 9092:
5. Piping flange JB，T74～90、GB／T 9112～9124、HG20592～20635、sH3406、ANsIB16 5、DlN2543～2548、GB／T 13402、APl605、ASMEBl6 47．
Structural features:
1. The structural length is short. Its structural length is only 1/4 to 1/8 of that of traditional flange check valves;
2. Small in size and lightweight, its weight is only 1/4 to 1/20 of traditional flange check heads;
3. Quick closure of valve disc tip. Low water hammer pressure:
4. Both horizontal and vertical pipelines can facilitate installation;
5. Smooth flow channel and low fluid resistance
6. Action sensitivity and good sealing performance;
7. Short stroke of the eye valve and low impact force when closing the valve;
8. Overall structure, simple and compact, beautiful appearance
9. Long monthly lifespan and high reliability.
Comparison of clamp type double disc check valve and swing type check valve:
structural form |
H76 type double disc swing check valve |
H44 type flange single disc swing check valve |
Water hammer pressure |
Small. The valve disc has a short stroke and is assisted by a spring to close, with a fast closing speed |
Very large, valve disc travel, requiring a long closing time |
The water hammer pressure of H76 type is only 1/2-1/5 of that of H44 type | ||
Dimensions and Weight |
The structure has a short length, small volume, and light weight, which brings great convenience to the installation, handling, storage, and pipeline layout of valves, and can save a lot of materials and reduce costs |
The structure has a long length, a bulky volume, and a heavy weight |
The structural length of H76 is only 1/4 to 1/10 of H44, and the weight of H76 is only 1/4 to 1/10 of H44 | ||
Fluid resistance |
Small, with a fluid resistance coefficient of 2.6-0.7. As the valve diameter increases, the fluid group force coefficient decreases |
Small, with a fluid resistance coefficient of 1.3-3, but under low pressure conditions, the valve disc cannot be fully opened and the fluid resistance is high. The fluid resistance increases with the increase of valve diameter |
install |
Can be installed horizontally or vertically, lightweight. No need to set up a support for the valve |
Can be installed horizontally or vertically. Large diameter valves are heavy and require supports to be installed |
Opening pressure |
Very small. The valve disc can open under a very small pressure difference |
Larger, the valve disc can only open under a larger pressure difference |
reliability |
The valve is of integral structure, simple and compact. When the valve is closed, the impact force is injected, and the water hammer pressure is small. The valve has a long service life and high reliability |
The enormous impact force and water hammer pressure when the valve is closed can easily damage the valve |
Comparison of clamp type double disc check valve and lift type check valve:
structural form |
H71 type clamp lift check valve |
H41 type flange lift check valve |
Water hammer pressure female |
Very small, short valve disc stroke, lightweight valve disc, and spring assisted closing, fast valve closing speed |
Short stroke of water and valve disc, but without spring assisted closure |
Dimensions and Weight |
The structure has a short length, small volume, and large diameter, which brings great convenience to the installation, handling, storage, and pipeline layout of valves. It can save a lot of materials and reduce costs |
The structure has a long length, a large volume, and a heavy weight |
The structural length of H71 type is only 1/4 to 1/8 of H41 type, and the weight of H71 type is only 1/7 to 1/20 of H41 type | ||
Fluid resistance |
Larger, with a fluid resistance coefficient of 6.4-2.8 |
The body resistance coefficient is between 12 and 6 |
install |
Can be installed horizontally or vertically, lightweight, easy to install |
Can only be installed horizontally, valves with larger diameters are heavier and difficult to install |
Opening pressure |
Very small, the valve disc can open under a very small pressure difference |
Small and heavy valve disc, requiring a certain pressure difference to partially open the valve disc |
reliability |
The valve is a monolithic structure, simple and compact, with minimal impact when the valve is closed, low water hammer pressure, long valve life, and high reliability |
High reliability, but the valve is composed of a valve body and a valve cover, which adds a potential leakage point |
The equivalent volume flow rate Vw of water and the actual fluid
The volumetric flow rate V is converted according to the following formula:
·V
In the formula: Vw is the equivalent volumetric flow rate of water. l／s；
P fluid density, k9／m 3
V is the volume flow rate of the actual fluid, l/s。
H76H clamp type double disc check valve：
Fluid dynamics performance: Fluid resistance coefficient, flow coefficient, and opening pressure of clamp type double valve check valve:
Nominal Diameter |
Fluid resistance coefficient when the valve is fully open |
Water flow coefficient when the valve is fully open at room temperature |
Flow direction of fluid |
||||
DN |
DNS |
||||||
Kv(m3／h) |
CV(U.S) |
CV(U.K) |
↑ |
→ |
|||
Approximate opening pressure KPa | |||||||
50 |
5 |
2.6 |
63 |
74 |
62 |
2 |
1 |
65 |
21/2 |
2.4 |
109 |
128 |
107 |
2 |
1 |
80 |
3 |
2.3 |
172 |
201 |
169 |
2 |
1 |
100 |
4 |
2.0 |
289 |
338 |
283 |
2 |
1 |
125 |
5 |
1.8 |
476 |
557 |
466 |
2 |
1 |
150 |
6 |
1.5 |
750 |
878 |
735 |
2 |
1 |
200 |
8 |
1.3 |
1432 |
1675 |
1403 |
2 |
1 |
250 |
10 |
1.2 |
1330 |
2726 |
2283 |
2 |
1 |
300 |
12 |
1.0 |
3676 |
4301 |
3602 |
2 |
1 |
350 |
14 |
0.9 |
5274 |
6171 |
5169 |
2 |
1 |
400 |
16 |
0.8 |
7306 |
8548 |
7160 |
3 |
1 |
450 |
18 |
0.8 |
9246 |
10818 |
9061 |
3 |
1 |
500 |
20 |
0.8 |
11415 |
13356 |
11187 |
3 |
1 |
600 |
24 |
0.7 |
17573 |
20560 |
17222 |
3 |
1 |
700 |
28 |
0.7 |
23919 |
27985 |
23441 |
4 |
1 |
750 |
30 |
0.7 |
27458 |
32126 |
26909 |
4 |
1 |
800 |
32 |
0.7 |
31241 |
36552 |
30316 |
4 |
1 |
900 |
36 |
0.7 |
39539 |
46261 |
38748 |
4 |
1 |
1000 |
40 |
0.7 |
48814 |
57112 |
47838 |
4 |
1 |
1050 |
42 |
0.7 |
53817 |
62966 |
52741 |
4 |
1 |
1200 |
48 |
0.7 |
70292 |
82242 |
68886 |
4 |
1 |
