The top-mounted ball valve is easy and quick to disassemble on the pipeline, and the maintenance is convenient and fast. When the valve fails on the pipeline and needs to be repaired, it is not necessary to remove the valve from the pipeline. It is only necessary to remove the middle flange bolts and nuts, remove the bonnet and stem assembly from the valve body together, and then remove the ball and valve Block assembly. You can repair the ball and valve seat online. This maintenance saves time and minimizes losses in production.
【Product Introduction】
The top-mounted ball valve is easy and quick to disassemble on the pipeline, and the maintenance is convenient and fast. When the valve fails on the pipeline and needs to be repaired, it is not necessary to remove the valve from the pipeline. It is only necessary to remove the middle flange bolts and nuts, remove the bonnet and stem assembly from the valve body together, and then remove the ball and valve Block assembly. You can repair the ball and valve seat online. This maintenance saves time and minimizes losses in production.
【Features】
The body of the top-mounted ball valve is an integral design, which will not affect the use of our valve because of the expansion and contraction of the pipeline. Both the ball and the valve seat adopt the top-mounted structure. When the valve is repaired, there is no need to remove the valve from the pipeline. It adopts an integrated type, which effectively solves the machining gap between the valve stem and the sphere, ensuring the precise positioning of the sphere and the protection structure of the valve stem against blowout. The sealing form of the valve stem and bonnet is not an ordinary packing seal, but a packing box combination seal is used. The ball and valve seat can adopt PPL or metal hard seal according to customer requirements.
【Product Categories】
Top-mounted ball valves are divided into floating ball valves and fixed ball valves .
Nominal size of bodywork floating ball valve ≤DN200. A compression spring is applied on the sphere, and the compression spring's role is to apply a pretension force on the sphere, so that the sealing surface of the valve seat is in close contact in any case, and the sealing performance is good. The wedge angle of the contact surface of the valve seat and the valve body is 10 °. The valve seat can be self-locked. In the pipeline direction, when the valve seat is subjected to a large pressure, the valve seat will not produce any displacement. Therefore, the valve of this structure has both the characteristics of a gate valve and the advantages of a ball valve . During maintenance inspection, it was found that the valve body and valve seat are prone to leakage. If the preload of the spring is increased , the closing torque of the ball valve is bound to increase . In order not to increase the closing torque of the ball valve , a rubber O-ring is added on the back of the seat sealing surface to solve the leakage problem on the back of the seat sealing surface.
The disadvantage of the top-mounted fixed ball valve is that the spring preload cannot be adjusted and controlled, and the spring compression is large during assembly, making assembly difficult. To solve this problem, ANSI 302 is used instead of 304 for the spring material. ANSI 302 has good spring rigidity, and its corrosion resistance is similar to 304. In addition, a spring seat and an adjustment nut are added. The threads are respectively turned on the outer circle of the valve seat and the spring seat, and the spring is pressed into the spring seat with the adjustment nut, and the valve seat assembly is inserted into the valve body. Since the spring has been compressed before installing the ball, it is convenient to install the ball. After the sphere is assembled, the adjustment nut is withdrawn from the spring seat, and the spring preload on the sphere is small. If you want to increase the preload, you can adjust the adjustment nut.
【Executive Standards】
Design standard GB / T 12237
Structure length standard GB / T 12221
Flange connection standard JB / T 79.1
Inspection and test standard GB / T 26480
Pressure-temperature: GB / T 9131
Product identification: GB / T 12220
【Performance parameters】
|
Nominal pressure PN (MPa) |
case |
Test pressure (MPa) |
Upper seal |
|
|
Seal (liquid) |
Seal (gas) |
|||
|
1.6 |
2.4 |
1.8 |
0.6 |
1.8 |
|
2.5 |
3.8 |
2.8 |
0.6 |
2.8 |
|
4.0 |
6.0 |
4.4 |
0.6 |
4.4 |
|
6.4 |
9.6 |
7.0 |
0.6 |
7.0 |
|
10.0 |
15.0 |
11.0 |
0.6 |
11.0 |
|
16.0 |
24.0 |
18.0 |
0.6 |
18.0 |
【Applicable medium and applicable temperature】
|
Shell material |
Applicable medium |
Applicable temperature (℃) |
|
Carbon steel (C type) |
Water, steam, oil |
≤425 |
|
Chromium nickel titanium steel (P type) |
Nitric acid |
≤200 |
|
Chromium nickel molybdenum titanium steel (R type) |
Acetic acid |
≤200 |
|
Chrome Molybdenum Steel (Type I) |
Water, steam, oil |
≤550 |
【Materials of main parts】
|
Valve body, bonnet |
Valve plate, valve seat |
Stem |
Stem nut |
filler |
Handwheel |
|
Carbon steel |
High quality carbon steel + hard alloy or stainless steel |
Chrome stainless steel |
Aluminum bronze |
Graphite asbestos packing |
Malleable cast iron |
|
Chromium nickel titanium steel |
Stainless steel, stainless steel + hard alloy |
Chrome nickel titanium stainless steel |
Aluminum bronze |
Polytetrafluoroethylene |
Malleable cast iron |
|
Chromium nickel molybdenum titanium steel |
Stainless steel, stainless steel + hard alloy |
Chrome nickel titanium stainless steel |
Aluminum bronze |
Polytetrafluoroethylene |
Malleable cast iron |
|
Chrome-molybdenum steel |
Alloy steel + hard alloy |
Chrome-molybdenum steel |
Aluminum bronze |
Flexible asbestos |
Malleable cast iron |
【Main appearance and connection size】
|
Nominal diameter |
Main external dimensions and connection dimensions |
|||||||
|
L |
D |
D1 |
D2 |
b |
Zd |
H |
D0 |
|
|
Z41H-16C |
||||||||
|
15 |
130 |
95 |
65 |
45 |
14-2 |
4-Φ14 |
170 |
120 |
|
20 |
150 |
105 |
75 |
55 |
14-2 |
4-Φ14 |
190 |
140 |
|
25 |
160 |
115 |
85 |
65 |
14-2 |
4-Φ14 |
205 |
160 |
|
32 |
180 |
135 |
100 |
78 |
16-2 |
4-Φ18 |
270 |
180 |
|
40 |
200 |
145 |
110 |
85 |
16-3 |
4-Φ18 |
310 |
200 |
|
50 |
250 |
160 |
125 |
100 |
16-3 |
4-Φ18 |
358 |
240 |
|
65 |
265 |
180 |
145 |
120 |
18-3 |
4-Φ18 |
373 |
240 |
|
80 |
280 |
195 |
160 |
135 |
20-3 |
8-Φ18 |
435 |
280 |
|
100 |
300 |
215 |
180 |
155 |
20-3 |
8-Φ18 |
500 |
300 |
|
125 |
325 |
245 |
210 |
185 |
22-3 |
8-Φ18 |
614 |
320 |
|
150 |
350 |
280 |
240 |
210 |
24-3 |
8-Φ23 |
674 |
360 |
|
200 |
400 |
335 |
295 |
265 |
26-3 |
12-Φ23 |
811 |
400 |
|
250 |
450 |
405 |
355 |
320 |
30-3 |
12-Φ25 |
969 |
450 |
|
300 |
500 |
460 |
410 |
375 |
30-3 |
12-Φ25 |
1145 |
580 |
|
350 |
550 |
520 |
470 |
435 |
34-4 |
16-Φ25 |
1280 |
640 |
|
400 |
600 |
580 |
525 |
485 |
36-4 |
16-Φ30 |
1452 |
640 |
|
Z41H-25 |
||||||||
|
15 |
130 |
95 |
65 |
45 |
16-2 |
4-Φ14 |
170 |
120 |
|
20 |
150 |
105 |
75 |
55 |
16-2 |
4-Φ14 |
190 |
140 |
|
25 |
160 |
115 |
85 |
65 |
16-2 |
4-Φ14 |
205 |
160 |
|
32 |
180 |
135 |
100 |
78 |
18-2 |
4-Φ18 |
270 |
180 |
|
40 |
200 |
145 |
110 |
85 |
18-3 |
4-Φ18 |
310 |
200 |
|
50 |
250 |
160 |
125 |
100 |
20-3 |
4-Φ18 |
358 |
240 |
|
65 |
265 |
180 |
145 |
120 |
22-3 |
8-Φ18 |
373 |
240 |
|
80 |
280 |
195 |
160 |
135 |
22-3 |
8-Φ18 |
435 |
280 |
|
100 |
300 |
230 |
190 |
160 |
24-3 |
8-Φ23 |
500 |
300 |
|
125 |
325 |
270 |
220 |
188 |
28-3 |
8-Φ25 |
614 |
320 |
|
150 |
350 |
300 |
250 |
218 |
30-3 |
8-Φ25 |
674 |
360 |
|
200 |
400 |
360 |
310 |
278 |
34-3 |
12-Φ25 |
811 |
400 |
|
250 |
450 |
425 |
370 |
332 |
36-3 |
12-Φ30 |
969 |
450 |
|
300 |
500 |
485 |
430 |
390 |
40-4 |
16-Φ30 |
1145 |
580 |
|
350 |
550 |
550 |
490 |
448 |
44-4 |
16-Φ34 |
1280 |
640 |
|
400 |
600 |
610 |
550 |
505 |
48-4 |
16-Φ34 |
1452 |
640 |
If you have any enquiry about quotation or cooperation,please feel free to email us at info@cnlgvalve.com or use the following enquiry form. Our sales representative will contact you within 24 hours. Thank you for your interest in our products.
