Ball Valve

Gate valve construction Features Function

Content Specification
General design standard API 600
Pressure-temperature rating ASME B16.34
Face-to-face dimension ASME B16.10
Flange type and dimension ASME B16.5
Butt-welded end ASME B16.25
Inspection and test API 598
1.Construction
ZGFQ gate valve adopt OS&Y, B.B, Rising Stem, Non-rising handwheel, which is in accordance with international general standard.
2.Body and Bonnet
After being strictly calculated, the design of the body and bonnet possess good performance of strength, rigidity, perfect seal and flowing ability. It makes more reliable for the seal of the packing and more convenient for the replacement of the packing to have assembled backseat onto the bonnet.
3.Wedge
ZGFQ gate valve adopt H type flexible solid wedge , which have excellent fitness to the body deform and so can guarantee reliability of the valves seal. This design can also reduce the overload caused by the difference in temperature load of the stem and the sealing surface. Particularly, it can avoid hard-to-open jam caused by the over load of the wedge . So this design is more fit to steam and other high temperature devices.
4.Seat
For ZGFQ gate valve in different pressure or specifications, the seat would have the following types:
(1) The connection of the seat ring and the body may either be threaded or welded type. The threaded type seat is easy for disassemble, maintenance and replacement.
(2) The sealing surface is directly welded on the body.
(3) For stainless steel gate valve, the sealing surface is machined and finished on the body.
5.Stem and Yoke Sleeve
T type is used for the connection between the stem and the wedge disc. The strength of the connection is guaranteed by integral forging of the T head and stem. The thread coordination of the stem and yoke sleeve adopts appropriate fit clearance and special thread remedy to ensure flexibility of the valve's actuation. While opening the valve, the top assembled yoke sleeve can ensure that the opening position of the disc will not change at all, even though the handwheel is disassembled. For high pressure and large size gate valve, there is a bearing is designed at the yoke sleeve.
6.Packing and Lantern Ring
The dimension and quantity of the packing conform to the standard to ensure the reliability of sealing. Packing materials are made of graphite (free of asbestos). The lantern ring may be supplied if the customers require.
7.Gasket
Connection between body and bonnet adopt bolted flange. The gasket of flange shall be as follows:
CLASS 150 Flat Gasket
CLASS 300 Female or Male Gasket
CLASS 600 & larger Octagon Ring Gasket
The metal spiral wound gasket with inner ring and filling with graphite makes more reliable for the seal of the gasket and excellent capability of disassembling and reassembling.

 

 

 

 

API Series Gate Valve

CLASS 150 Gate Valve
Bolted Bonnet, OS&Y, Rising Stem, Non-rising Handwheel, Flexible Single Wedge
¡¡¡¡RF ¡¡¡¡ BW 12¡å& above 12¡åwith bearing 14¡å& above 14¡åmay match gear operator when the customers inquire

 

Dimensions£¨Flange dimensions refer to ASME B16.5 CLASS150£©

DN
2"
21/2"
3"
4"
5"
6"
8"
10"
12"
14"
16"
18"
20"
d1
51
64
76
102
127
152
203
254
305
337
387
438
489
L
RF
178
190
203
229
254
267
292
330
356
381
406
432
457
BW
216
241
283
305
381
403
419
457
502
572
610
660
711
H
283
430
507
587
658
757
958
1162
1361
1523
1693
1887
2120
W
200
200
250
250
300
300
350
400
450
500
600
600
680
Wt
20
27
32
46
70
82
127
195
283
400
525
680
1440
CLASS 150 Gate Valve  
Non-rising Handwheel, Flexible Single Wedge
¡¡RF¡¡¡¡¡¡BW 10¡å& above 10¡åwith bearing 12¡å& above 12¡åmay match gear operator when the customers inquire

 

Dimensions£¨Flange dimensions refer to ASME B16.5 CLASS300£©
DN
2"
21/2"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
d1
51
64
76
102
152
203
254
305
337
387
432
483
L(RF&BW)
216
241
283
305
403
419
457
502
762
838
914
991
H
411
454
528
613
790
1013
1215
1437
1561
1840
2020
2160
W
200
200
250
250
350
400
450
500
600
600
680
760
Wt
29
36
50
74
137
217
337
486
729
930
1250
1630

CLASS 600 Gate Valve
Bolted Bonnet, OS&Y, Rising Stem, Non-rising Handwheel, Flexible Single Wedge
¡¡¡¡¡¡
¡¡RTJ¡¡RF¡¡BW 6¡å& above 6¡åwith bearing 8¡å& above 8¡åmay match gear operator when the customers inquire

 

Dimensions £¨Flange dimensions refer to ASME B16.5 CLASS600£©
DN
2"
21/2"
3"
4"
6"
8"
10"
12"
14"
16"
d
51
64
76
102
152
200
248
298
329
375
L
RF&BW
292
330
356
432
559
660
787
838
889
991
RTJ
295
333
359
435
562
664
790
841
892
994
H
447
499
544
666
892
1065
1257
1464
1593
1779
W
200
250
250
300
450
500
600
680
760
760
Wt
41
55
70
123
246
426
649
920
1220
1430
CLASS 900 & 1500 Gate Valve
Bolted Bonnet, OS&Y, Rising Stem, Non-rising Handwheel, Flexible Single Wedge
RTJ¡¡RF¡¡BW 6¡å& above 6¡åwith bearing 6¡å& above 6¡åmay match gear operator when the customers inquire

 

ClASS900 Dimensions £¨Flange dimensions refer to ASME B16.5 CLASS900£©
DN
2"
21/2"
3"
4"
6"
8"
d
47
57
73
98
146
190
L
RF&BW
368
419
381
457
610
737
RTJ
371
422
384
460
613
740
H
521
560
620
698
901
1087
W
250
300
300
350
500
600
Wt
84
92
105
142
345
590
Class1500 Dimensions £¨Flange dimensions refer to ASME B16.5 CLASS1500£©
DN
2"
21/2"
3"
4"
6"
8"
d
47
57
70
92
136
174
L
RF&BW
368
419
470
546
705
832
RTJ
371
422
473
549
711
841
H
555
633
686
772
1050
1250
W
250
300
350
400
600
680
Wt
96
110
145
240
510
920

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