First, the structural characteristics and uses
1, through the flange for the square structure, the stem rod connection.
2, the valve body sealing surface using ball convex shape, and the valve to line seal.
3, the sealing surface with Babbitt, sealing performance, long service life.
Globe
dark globe valves often use oxygen, nitrogen, hydrogen, argon and other
gases. These gases are generally stored in a dedicated high-pressure
gas. When using the ammonia through the cut-off valve to gas pressure
drop to the desired range of experiments, and then through the other
control valve fine-tuning, the gas input system. The most commonly used
pressure reducing valve for the ammonia valve, referred to as ammonia
valve.
Second, performance specifications
|
Nominal pressure PN (MPA) |
Test pressure PS (MPa) |
Suitable media |
Applicable temperature (℃) |
|
|
2.5 |
3.8 |
Ammonia, |
Babbitt alloy |
PTFE |
|
4.0 |
6.4 |
|||
Third, the main size and weight:
|
DN (mm) |
Size (mm) |
|||||||||||
|
L |
D |
D1 |
D2 |
D4 |
b |
f |
f1 |
Z-φd |
turn off |
open |
D3 |
|
|
10 |
130 |
90 |
60 |
40 |
35 |
16 |
2 |
4 |
4-φ14 |
165 |
185 |
110 |
|
15 |
130 |
95 |
65 |
45 |
40 |
16 |
2 |
4 |
4-φ14 |
165 |
185 |
110 |
|
20 |
150 |
105 |
75 |
55 |
51 |
18 |
2 |
4 |
4-φ14 |
170 |
200 |
120 |
|
25 |
160 |
115 |
85 |
65 |
58 |
18 |
2 |
4 |
4-φ14 |
197 |
210 |
120 |
|
32 |
180 |
135 |
100 |
78 |
66 |
20 |
2 |
4 |
4-φ18 |
199 |
213 |
140 |
|
40 |
200 |
145 |
110 |
85 |
76 |
20 |
3 |
4 |
4-φ18 |
248 |
264 |
160 |
|
50 |
230 |
160 |
125 |
100 |
88 |
22 |
3 |
4 |
4-φ18 |
265 |
295 |
180 |
|
65 |
290 |
180 |
145 |
120 |
110 |
24 |
3 |
4 |
8-φ18 |
310 |
349 |
220 |
|
80 |
310 |
195 |
160 |
135 |
121 |
26 |
3 |
4 |
8-φ18 |
340 |
357 |
240 |
|
100 |
350 |
230 |
190 |
160 |
150 |
30 |
3 |
4.5 |
8-φ23 |
380 |
413 |
280 |
|
125 |
400 |
270 |
220 |
188 |
176 |
32 |
3 |
4.5 |
8-φ25 |
430 |
451 |
320 |
|
150 |
480 |
300 |
250 |
218 |
204 |
32 |
3 |
4.5 |
8-φ25 |
505 |
492 |
360 |
|
200 |
600 |
360 |
310 |
278 |
260 |
34 |
3 |
4.5 |
12-φ25 |
550 |
806 |
400 |
|
250 |
650 |
425 |
370 |
335 |
31 |
36 |
3 |
4.5 |
12-φ30 |
730 |
880 |
450 |
|
300 |
750 |
485 |
430 |
390 |
364 |
40 |
3 |
4.5 |
16-φ30 |
- |
995 |
550 |
Fourth, the appearance and working principle
Ammonia valve high pressure chamber and the cylinder connection, low
pressure chamber for gas exports, and access to the use of the
system. Indication of high pressure gauge is the pressure of gas stored
in the cylinder. Low pressure gauge outlet pressure can be controlled by
adjusting screw.
Open the cylinder main switch when using, then turn the low pressure
gauge pressure adjusting screw clockwise to compress the main spring and
drive the diaphragm, spring pad and ejector to open the valve. Such
imports of high-pressure gas from the high-pressure chamber after
throttling decompression into the low-pressure chamber, and through the
exit leading to the working system. Turn the adjusting screw to change
the opening height of the valve to regulate the passage of high-pressure
gas and achieve the desired pressure value.
Ammonia cut-off valves are equipped with safety valves. It is to
protect the ammonia valve and make it safe to use the device, but also
the ammonia valve failure signal device. If due to the valve pad, valve
damage or for other reasons, resulting in the pressure on the outlet and
rise above a certain allowable value, the safety valve will
automatically open the exhaust.
Fifth, the use of
(1) according to the different requirements of use, ammonia valve has
many specifications. Most of the highest import pressure, the minimum
import pressure of not less than 2.5 times the outlet pressure. Export
pressure specifications more generally, the maximum outlet pressure.
(2) Ammonia valve should be installed to determine whether the
connection specifications consistent with the use of the system
connector. Ammonia globe valve with hemispherical connection, by
tightening the nut so that the two completely match. Therefore, the use
of the two hemispherical surfaces should be kept clean to ensure a good
airtight effect. Use high-pressure gas to blow off the dust before
installation. If necessary, PTFE and other materials can also be used
for gaskets.
(3) ammonia valve should be prohibited from contact with grease, so as to avoid fire accidents.
(4) stop working, the relief valve should be more than air net, and
then loosen the adjustment screw to prevent long-term compression of the
elastic deformation.
(5) Ammonia stop valve should be avoided impact vibration, not with corrosive substances in contact.
