Purpose
Gate valve with bellow seal acc. To GB is to the cutting and connection of pipelines medium that are used in various industries such as petroleum, chemical industry, pharmacy, chemical fertilizer, electric power industry etc under nominal pressure of PN1.6~16Mpa and working temperature of-29~350℃
Structural features:
1.This product has logical structure, reliable seal, excellent performance and nice design.
2.The seal surface is build-up welding with Co hard alloy, which is attrition-resistant, corrosion-resistant, has good friction resistant and long life.
3.The stem is quenched and its surface is treated by nit riding treatment, thus it has good corrosion resistant and friction resistant.
4.It has double seal capability, thus is more reliable.
5.The stem may show the position of lift, thus it is clearer.
6.The part material, flange and butt weld end dimension may be selected according to current operating condition and users’ requirement. So that meet the requirements of various engineering.
Technical specification
Structural formation: BB-BG-OS&Y
Driving manner: Hand-operated Electric-actuated
Design standard: GB12234
Face to face: GB12221
Flange ends: GB9113、JB/T9092、GB/T13927
Test & inspection: JB/T9092、GB/T13927
Products performance specification
|
Nominal pressure(Mpa)
|
Shell test (Mpa)
|
Sealing test (Mpa)
|
Suitable temp. (℃)
|
Suitable medium
|
|
1.6
|
2.4
|
1.76
|
≤350℃
|
Water oil& gas
|
|
2.5
|
3.75
|
2.75
|
|
4.0
|
6.0
|
4.4
|
|
6.4
|
9.6
|
7.04
|
Main parts materials
|
NO.
|
Part name
|
Material
|
|
1
|
Body
|
WCB、CF8、CF8M、CF3、CF3M
|
|
2
|
Disc
|
25、1Cr13、2Cr13、1Cr18Ni9Ti、 0Cr18Ni12Mo2Ti、20Cr1Mo1V、25Cr2MoV
|
|
3
|
Stem
|
25、1Cr13、2Cr13、1Cr18Ni9Ti、 0Cr18Ni12Mo2Ti、20Cr1Mo1V、25Cr2MoV
|
|
4
|
Bellow assemble
|
1Cr18Ni9Ti、304、316、304L、316L
|
|
5
|
Yoke
|
WCB、CF8、CF8M、CF3、CF3M
|
|
6
|
Gasket
|
Flexible graphite + stainless steel、PTFE
|
|
7
|
Bonnet
|
WCB、CF8、CF8M、CF3、CF3M
|
|
8
|
Nut
|
0Cr18Ni9Ti、0Cr18Ni12Mo2Ti、35CrMoV、25Cr2MoV
|
|
9
|
Bolt
|
0Cr18Ni9Ti、0Cr18Ni12Mo2Ti、35CrMoV、25Cr2MoV
|
|
10
|
Packing
|
Flexible graphite、PTFE
|
|
11
|
Gland
|
WCB、CF8、CF8M、CF3、CF3M
|
|
12
|
Yoke nut
|
ZQA19-4
|
|
13
|
Hand wheel
|
WCB QT400-18
|
Main dimension and weight
|
Model
|
LFGWZ41-16
|
|
Pressure
|
PN16
|
|
Size
|
15
|
20
|
25
|
32
|
40
|
50
|
65
|
80
|
100
|
125
|
150
|
200
|
250
|
300
|
350
|
|
L
|
108
|
117
|
127
|
140
|
165
|
178
|
190
|
203
|
229
|
254
|
267
|
292
|
330
|
356
|
381
|
|
H
|
200
|
210
|
250
|
260
|
290
|
370
|
398
|
440
|
490
|
530
|
580
|
670
|
760
|
850
|
950
|
|
W
|
120
|
140
|
140
|
180
|
200
|
220
|
260
|
280
|
300
|
340
|
400
|
450
|
450
|
500
|
500
|
|
Weight
|
8
|
9
|
10
|
15
|
22
|
30
|
43
|
57
|
73
|
105
|
150
|
190
|
270
|
380
|
480
|
|
Model
|
LFGWZ41-25
|
|
Pressure
|
PN25
|
|
Size
|
15
|
20
|
25
|
32
|
40
|
50
|
65
|
80
|
100
|
125
|
150
|
200
|
250
|
300
|
350
|
|
L
|
140
|
152
|
165
|
178
|
190
|
216
|
241
|
283
|
305
|
381
|
403
|
419
|
457
|
502
|
762
|
|
H
|
200
|
210
|
250
|
260
|
290
|
370
|
398
|
440
|
490
|
530
|
580
|
670
|
760
|
850
|
950
|
|
W
|
120
|
140
|
140
|
180
|
200
|
220
|
260
|
280
|
300
|
340
|
400
|
450
|
450
|
500
|
500
|
|
Weight
|
9
|
10
|
12
|
17
|
23
|
34
|
50
|
65
|
82
|
115
|
165
|
210
|
300
|
420
|
540
|
|
Model
|
LFGWZ41-16
|
|
Pressure
|
PN16
|
|
Size
|
15
|
20
|
25
|
32
|
40
|
50
|
65
|
80
|
100
|
125
|
150
|
200
|
250
|
300
|
350
|
|
L
|
165
|
190
|
216
|
229
|
241
|
292
|
330
|
356
|
432
|
508
|
559
|
660
|
787
|
838
|
889
|
|
H
|
200
|
210
|
250
|
260
|
290
|
370
|
398
|
440
|
490
|
530
|
580
|
670
|
760
|
850
|
950
|
|
W
|
120
|
140
|
140
|
180
|
200
|
220
|
260
|
280
|
300
|
340
|
400
|
450
|
450
|
500
|
500
|
|
Weight
|
9
|
10
|
12
|
18
|
25
|
38
|
53
|
70
|
88
|
125
|
175
|
225
|
310
|
440
|
560
|