D41XP and D341XP flange stainless steel plate soft seal butterfly valves, valve body made of cast steel or cast iron, valve plate made of stainless steel, valve plate can be made of 304 or 316 stainless steel, flange connection center plate butterfly valve is the latest patented product, which combines some advantages of eccentric flange butterfly valve and center line clamp butterfly valve, filling a gap between eccentric flange butterfly valve and center line clamp butterfly valve. The opening and closing part of this valve is a disc-shaped butterfly plate that rotates around its own axis inside the valve body to achieve opening and closing or adjustment functions.
Application and characteristics of soft sealed butterfly valves
Soft sealed butterfly valves are suitable for regulating flow and intercepting media on water supply and gas pipelines in food, medicine, chemical, petroleum, electricity, metallurgy, urban construction, light textile, paper making etc.Their main characteristics are:
The design is novel and reasonable, with a unique structure, light weight, and fast opening and closing.
Small operating torque, convenient operation, labor-saving and clever.
Can be installed in any position, convenient for maintenance.
The sealing element can be replaced, and the sealing performance is reliable, achieving zero leakage in bidirectional sealing.
The sealing material has characteristics such as aging resistance, corrosion resistance, and long service life.
Simple structure, good interchangeability, and low price.
The valve stem seal is not easily deformed, thus avoiding the common phenomenon of valve stem leakage. Overall support is good, stable and firm.
The amount of rubber used for the valve seat is small, and the potential impact of expansion is small. It is easy to control the torque value within an appropriate range. The use of a two section valve stem with no pin connection makes the structure simple and compact, making maintenance and disassembly extremely convenient.
The butterfly plate has an automatic centering function, achieving a small interference fit between the butterfly plate and the valve seat. The phenolic backrest seat has the characteristics of non detachment, tensile strength, leak resistance, and easy replacement. Due to the integration of the sealing surface of the valve seat and the backrest, the deformation of the valve seat is reduced.
Main component materials
Valve body: 304, 316L
Disc: 304, 316L
Valve seat: natural rubber (NR) -20~+85 ℃, ethylene propylene rubber (EPDM)-40~+125℃,nitrile rubber(NBR)-20~+82℃, polytetrafluoroethylene plastic (PTFE)+10~+150 ℃
Valve stem: stainless steel, 2Cr13
Product external and structural size:
|
DN |
A |
B |
b |
f |
D |
K |
d |
F |
N*d0 |
L |
L1 |
D1 |
D2 |
N-d1 |
a° |
J |
X |
L2 |
Φ2 |
Weight kg |
|
50 |
83 |
120 |
19 |
3 |
165 |
125 |
99 |
13 |
4*Φ19 |
108 |
111 |
65 |
50 |
4-Φ7 |
45 |
13.8 |
3 |
32 |
12.6 |
7.6 |
|
65 |
93 |
130 |
19 |
3 |
185 |
145 |
118 |
13 |
4*Φ19 |
112 |
115 |
65 |
50 |
4-Φ7 |
45 |
13.8 |
3 |
32 |
12.6 |
9.7 |
|
80 |
100 |
145 |
19 |
3 |
200 |
160 |
132 |
13 |
8*Φ19 |
114 |
117 |
65 |
50 |
4-Φ7 |
45 |
13.8 |
3 |
32 |
12.6 |
10.6 |
|
100 |
114 |
155 |
19 |
3 |
220 |
180 |
156 |
13 |
8*Φ19 |
127 |
130 |
90 |
70 |
4-Φ10 |
45 |
17.77 |
5 |
32 |
15.77 |
13.8 |
|
125 |
125 |
170 |
19 |
3 |
250 |
210 |
184 |
13 |
8*Φ19 |
140 |
143 |
90 |
70 |
4-Φ10 |
45 |
20.92 |
5 |
32 |
18.92 |
18.2 |
|
150 |
143 |
190 |
19 |
3 |
285 |
240 |
211 |
13 |
8*Φ23 |
140 |
143 |
90 |
70 |
4-Φ10 |
45 |
20.92 |
5 |
32 |
18.92 |
21.7 |
|
200 |
170 |
205 |
20 |
3 |
340 |
295 |
266 |
13 |
12*Φ23 |
152 |
155 |
125 |
102 |
4-Φ12 |
45 |
24.1 |
5 |
45 |
22.1 |
31.8 |
|
250 |
198 |
235 |
22 |
3 |
405 |
355 |
319 |
13 |
12*Φ28 |
165 |
168 |
125 |
102 |
4-Φ12 |
45 |
31.45 |
8 |
45 |
28.45 |
44.7 |
|
300 |
223 |
280 |
24.5 |
4 |
460 |
410 |
370 |
20 |
12*Φ28 |
178 |
182 |
125 |
102 |
4-Φ12 |
45 |
34.6 |
8 |
45 |
31.6 |
59 |
|
350 |
270 |
310 |
26.5 |
4 |
520 |
470 |
429 |
20 |
16*Φ28 |
190 |
194 |
150 |
125 |
4-Φ14 |
45 |
36.15 |
10 |
45 |
33.15 |
86 |
|
400 |
300 |
340 |
28 |
4 |
580 |
525 |
480 |
20 |
16*Φ31 |
216 |
221 |
175 |
140 |
4-Φ18 |
45 |
40.95 |
10 |
51 |
37.95 |
119 |
|
450 |
340 |
375 |
30 |
4 |
640 |
585 |
530 |
20 |
20*Φ31 |
222 |
227 |
175 |
140 |
4-Φ18 |
45 |
45.96 |
12 |
51 |
42.86 |
165 |
|
500 |
355 |
430 |
31.5 |
4 |
715 |
650 |
582 |
22 |
20*Φ34 |
229 |
234 |
210 |
165 |
4-Φ22 |
45 |
49.22 |
14 |
57 |
45.72 |
185 |
|
600 |
410 |
500 |
36 |
5 |
840 |
770 |
682 |
22 |
20*Φ37 |
267 |
272 |
300 |
254 |
8-Φ18 |
22.5 |
57.98 |
15 |
70 |
53.98 |
263 |
|
700 |
478 |
560 |
39.5 |
5 |
910 |
840 |
794 |
30 |
24*Φ37 |
292 |
299 |
300 |
254 |
8-Φ18 |
22.5 |
71.35 |
18 |
66 |
63.35 |
361 |
|
800 |
529 |
620 |
43 |
5 |
1025 |
950 |
901 |
30 |
24*Φ41 |
318 |
325 |
350 |
298 |
8-Φ22 |
22.5 |
79 |
20 |
66 |
70 |
484 |
|
900 |
584 |
665 |
46.5 |
5 |
1125 |
1050 |
1001 |
34 |
28*Φ41 |
330 |
337 |
350 |
298 |
8-Φ22 |
22.5 |
90 |
22 |
118 |
80 |
598 |
|
1000 |
657 |
735 |
50 |
5 |
1255 |
1170 |
1112 |
34 |
28*Φ44 |
410 |
417 |
350 |
298 |
8-Φ22 |
22.5 |
100 |
25 |
142 |
90 |
824 |
Applicable situation for butterfly valves
Butterfly valves are suitable for flow regulation. Due to the significant pressure loss of butterfly valves in pipelines, which is about three times that of gate valves, when selecting a butterfly valve, the impact of pressure loss on the pipeline system should be fully considered, and the robustness of the butterfly plate to withstand the pressure of the pipeline medium when closed should also be considered. In addition, it is necessary to consider the limitations of the working temperature that the elastic valve seat material can withstand at high temperatures.
The structural length and overall height of butterfly valves are small, with fast opening and closing speeds, and good fluid control characteristics. The structural principle of butterfly valves is most suitable for making large-diameter valves. When using butterfly valves for flow control, the most important thing is to choose the correct size and type of butterfly valve so that it can work properly and effectively.
Usually, in throttling, regulating control, and mud media, short structural length and fast opening and closing speed (1/4 turn) are required. Low pressure cutoff (small pressure difference), it is recommended to use butterfly valves.
Butterfly valves can be used in channels with dual adjustment, contraction, low noise, cavitation and gasification phenomena, small leakage into the atmosphere, and corrosive media.
When using butterfly valves under special operating conditions such as throttling adjustment, strict sealing requirements, severe wear, low temperature (deep cold), etc., special three eccentric or double eccentric butterfly valves with specially designed metal sealing belt adjustment devices need to be used.
The mid line butterfly valve is suitable for fresh water, sewage, seawater, saline water, steam, natural gas, food, medicine, oil, various acid tanks, and other pipelines that require complete sealing, zero gas leakage during gas testing, high service life requirements, and operating temperatures between -10~150 ℃.
Soft sealed eccentric butterfly valves are suitable for bi-directional opening and closing and adjustment of ventilation and dust removal pipelines, and are widely used in gas pipelines and waterways in metallurgical, light industry, power, petrochemical systems, etc.
Metal to metal wire sealed double eccentric butterfly valves are suitable for urban heating, steam supply, water supply, gas, oil, acid-base and other pipelines as regulating and shut-off devices.
Metal to metal face sealed triple eccentric butterfly valves are not only used as program control valves for large pressure swing adsorption (PSA) gas separation devices, but also widely used in fields such as petroleum, petrochemical, chemical, metallurgical, and electric power. They are good substitutes for gate valves, globe valves, and so on.
The selection principles of butterfly valves
- Due to the relatively large pressure loss of butterfly valves compared to gate valves and ball valves, they are suitable for pipeline systems with less stringent pressure loss requirements.
- Since butterfly valves can be used for flow regulation, they are suitable for use in pipelines that require flow control.
- Due to the limitations of the structure and sealing materials of butterfly valves, they are not suitable for high temperature and high pressure pipeline systems. The general working temperature is below 300 ℃, and the nominal pressure is below PN40.
- Due to the short length of the butterfly valve structure and its ability to be made into a large diameter, it is advisable to choose a butterfly valve in situations where the structural length is required to be short or for large diameter valves (such as DN1000 or above).
- Due to the fact that butterfly valves can be opened or closed by only rotating, it is advisable to choose butterfly valves in areas with fast opening and closing requirements.
Installation precautions:
- Before installation, the specifications, pressure, temperature, and corrosion resistance of the butterfly valve should be checked to ensure that they meet the requirements for use. Each component should be checked for damage or looseness.
- This butterfly valve can be installed on pipelines at any angle and should be closed for installation; When welding pipeline flanges, the valve sealing port should be blocked with a plate to prevent particles and debris from damaging the sealing surface. After welding, remove the valve, clean the valve sealing surface and pipeline cavity, and then install and fix the valve.
- Please pay attention to the pressure direction when installing when the valve is closed.
- Before installation, the sealing surfaces (sealing surfaces at both ends, butterfly plate sealing surfaces, and valve seat sealing surfaces) should be thoroughly wiped clean to remove dust and dirt.
- Before installation, the butterfly valve should be air tested, with flexible opening and closing, and the opening and closing positions should match the indicated positions of the pointer.
- Manually operate clockwise to close and counterclockwise to open. Do not apply force to open or close the valve after the pointer indicates it is in place.
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