First, the pneumatic two-seat control valve overview
ZJHN pneumatic two-seat control valve with double-guided structure, equipped with multi-spring recruit agencies. Has the advantages of compact structure, light weight, action sensitive, large valve capacity, accurate flow characteristics, easy disassembly. Pneumatic two-seat control valve is widely used in precise control of gas, liquid, steam and other media process parameters such as pressure, flow, temperature, liquid level at a given value. Particularly suitable for large pressure drop, allowing greater leakage and not very clean media occasions.
Pneumatic two-seat control valve products are standard, bellows sealed, jacket insulation and other varieties. Product nominal pressure rating PN16, 40, 64; body diameter range DN25 ~ 400. Applicable fluid temperature -250 ℃ ~ + 560 ℃ range of a variety of grades. Leakage standards for grade Ⅲ and Ⅳ. Flow characteristics are linear or percentage. A wide variety of specifications to choose from.
Second, pneumatic two-seat control valve main parts and materials
|
Part Name |
material |
temperature range |
|
Body valve cover |
HT200 |
-20 ~ 200 ℃ |
|
ZG230-450 |
-40 ~ 450 ℃ |
|
|
ZG1Cr18Ni9Ti |
-250 ~ 550 ℃ |
|
|
ZG0Cr18Ni12Mo2Ti |
-250 ~ 550 ℃ |
|
|
Spool, seat |
1Cr18Ni9 |
-250 ~ 550 ℃ |
|
0Cr18Ni12Mo2Ti |
-250 ~ 550 ℃ |
|
|
filler |
Teflon |
-40 ~ 200 ℃ |
|
Diaphragm |
NBR rubber reinforced polyester fabrics |
|
|
compressed spring |
60Si2Mn |
|
|
Membrane cover |
A3 |
Third, pneumatic two-seat control valve main technical parameters
|
Nominal diameter mm |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
250 |
300 |
400 |
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|
Rated flow coefficient kv |
10 |
16 |
25 |
40 |
63 |
100 |
250 |
250 |
400 |
630 |
100 |
1600 |
2700 |
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|
Nominal pressure MPa |
1.6 4.0 6.4 |
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Travel mm |
16 |
25 |
40 |
63 |
100 |
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Medium temperature ℃ |
-40 ~ 230 ℃ (room temperature type), heat sink 230 ~ 450 ℃ (medium temperature), special order -100 ~ 600 ℃ |
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Flow characteristics |
Straight line, equal percentage |
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Flange standard |
In line with JB78-59, JB79-59 standards, according to JB / 79.1-94, JB / 79.2-94, ANSI, JIS, DIN and other standard production orders |
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|
Body material |
PN (MPa) |
1.6 |
WCB (ZG230-450) CF3CF8 CF8M |
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|
4.0,6.0 |
WCB (ZG230-450), ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti CF8 CF8M |
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|
Spool material |
1Cr18Ni9,0Cr18Ni12Mo2Ti CF8 CF8M |
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On the bonnet type |
Ordinary type (normal temperature type), hot type (medium temperature type) |
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Adjustable ratio |
30: 1 |
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Air source connector |
M16 × 1.5 |
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Fourth, pneumatic two-seat control valve pneumatic actuator
|
model |
ZHA (B) -1 |
ZHA (B) -2 |
ZHA (B) -3 |
ZHA (B) -4 |
ZHA (B) -5 |
ZHA (B) -6 |
|
Effective area of cm2 |
200 |
280 |
400 |
630 |
1000 |
1600 |
|
Travel mm |
10 |
16 |
25 |
40 |
60 |
1000 |
|
Spring range KPa |
20 to 100 (standard); 20 to 100, 40 to 200, 20 to 60, 60 to 100, 80 to 240 |
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Fifth, pneumatic two-seat control valve pneumatic actuator main technical performance indicators
|
project |
Index value |
|
|
Basic error% |
Without locator |
± 5.0 |
|
With locator |
± 1.0 |
|
|
Backlash% |
Without locator |
3.0 |
|
With locator |
1.0 |
|
|
dead zone% |
Without locator |
3.0 |
|
With locator |
0.4 |
|
|
Permissible leakage L / h |
1 × 10-3 × valve rated capacity |
|
Sixth, pneumatic two-seat control valve actuator allows pressure
|
Supply pressure MPa |
Spring pressure KPa |
Nominal diameter |
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|
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
250 |
300 |
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|
0.14 |
20-100 |
5.4 |
4.4 |
4.9 |
3.8 |
4.7 |
3.6 |
2.8 |
3.75 |
2.7 |
2.15 |
2.0 |
1.7 |
|
0.24 |
40-200 |
10.8 |
8.8 |
9.8 |
7.6 |
9.4 |
7.2 |
5.6 |
7.5 |
5.4 |
4.3 |
4.0 |
3.4 |
Note: The condition of use is P2 = 0 when the stem is out of the media outlet.
Seven, pneumatic two-seat control valve dimensions
|
Public Path (mm) |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
250 |
300 |
|
|
L (mm) |
PN1.6MPa |
185 |
200 |
220 |
250 |
275 |
300 |
350 |
410 |
450 |
550 |
670 |
770 |
|
PN4.0MPa |
190 |
210 |
230 |
255 |
285 |
310 |
335 |
425 |
460 |
560 |
740 |
805 |
|
|
PN6.4MPa |
200 |
210 |
235 |
265 |
295 |
320 |
370 |
440 |
475 |
570 |
750 |
820 |
|
|
H (mm) |
normal type |
567 |
570 |
645 |
650 |
877 |
887 |
899 |
1058 |
1068 |
1110 |
1498 |
1574 |
|
Heat sink type |
697 |
700 |
775 |
780 |
1040 |
1050 |
1062 |
1257 |
1267 |
1309 |
1743 |
1819 |
|
|
H1 (mm) |
117 |
120 |
139 |
144 |
188 |
208 |
220 |
268 |
278 |
320 |
441 |
503 |
|
|
D (mm) |
225 |
360 |
470 |
620 |
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|
Weight (KG) |
33 |
35 |
47 |
51 |
98 |
111 |
148 |
236 |
292 |
433 |
760 |
920 |
|
