Metal-sealed rotary ball valve
Keywords:
Valve Encyclopedia
Category:
- Product Description
-
Overview
This valve is a newly developed, entirely new-type valve that combines the performance characteristics of hard-sealed butterfly valves, half-ball valves, and ball valves. It is currently a cost-effective ball-valve-like product on the market and has received high praise from users.
Product Features
· On the two sealing surfaces of the sealing pair, advanced processes such as plasma spraying and surfacing welding can be employed to form gradient functional materials—including martensitic stainless steel, austenitic stainless steel, and hard alloys—according to different hardness requirements.
· It can automatically align to the center (adaptive) and automatically compensate for wear-induced overtravel: not only can it reliably shut off under forward pressure, but it can also reliably shut off under reverse pressure or when reverse pressure significantly exceeds forward pressure; during closure, it fully utilizes the energy of the medium within the valve to automatically generate an extremely high sealing specific pressure, ensuring that the highly rigid sealing pair achieves reliable zero leakage.
· Its main structure is similar to that of a butterfly valve, inheriting the latter’s characteristics of shortness and compact size. As a result, it can be used to manufacture valves with large diameters, extra-large diameters, and even ultra-large diameters. The bidirectional hard-sealed rotary ball valve simultaneously combines the functions and advantages of butterfly valves, half-ball valves, gate valves, and globe valves, while also possessing its own uniquely powerful features and benefits. It boasts a host of advantages, including small size, light weight, ease of transportation, installation, maintenance, and inspection, as well as reliable operation. It achieves instantaneous closure and opening with no friction between sealing surfaces. During opening, the projected cross-section of the valve disc continuously shrinks inward and retracts backward; at the initial stage of opening, the retraction rate exceeds the inward shrinkage rate. During closing, the projected cross-section of the valve disc continuously expands outward and advances forward; at the initial stage of closing, the expansion rate surpasses the advancing rate, while toward the end of closing, the advancing rate becomes faster than the expansion rate. This valve exhibits characteristics of eccentric half-ball valves (high-pressure ball valves), globe valves, and wedge-type gate valves.
Implementation standard
Standard content
Standard Number
Standard Name
Design and Manufacturing Standards
JB/T14317
Rotary ball valve
Flange standard (or as per user requirements)
GB/T9124.1
All-steel pipe flange
GB/T17241.6
Integral cast iron flange
Structural length standard
GB/T12221
Structural length of metal valves
Pressure Test Standard
GB/T13927
Pressure Testing of Industrial Valves
Use material standards
GB/T12227
Technical Specifications for Ductile Iron Castings of General Valves
GB/T12229
Technical Specifications for Carbon Steel Castings of General Valves
GB/T12230
Technical Specifications for Stainless Steel Castings of General Valves
Material of main components
Nominal diameter
Material name or code
Valve body
QT450-10, WCB, Stainless Steel
Valve plate
QT450-10, 2Cr13, Q235B, stainless steel
Valve shaft
2Cr13, stainless steel
Valve seat
2Cr13, Q235B, stainless steel
External Structural Diagram and Connection Dimensions of Metal-Sealed Rotary Ball Valve
QDH3401-6~10 Worm Gear Drive Metal-Sealed Rotary Ball Valve – Units: mm
DN
H1
H2
H3
A1
A2
①
L
0.6MPa
1.0MPa
D
D1
n-d
D
D1
n-d
80
120
175
52
144
76
200
114
190
150
4-φ18
200
160
8-φ18
100
140
205
52
144
76
200
127
210
170
4-φ18
220
180
8-φ18
125
160
217
52
144
76
200
140
240
200
8-φ18
250
210
8-φ18
150
180
253
62
167
96
250
140
265
225
8-φ18
285
240
8-φ22
200
200
283
68
188
115
280
152
320
280
8-φ18
340
295
8-φ22
250
245
320
68
188
115
280
165
375
335
12-φ18
395
350
12-φ22
300
264
378
75
215
139
320
178
440
395
12-φ22
445
400
12-φ22
350
296
428
105
254
170
350
190
490
445
12-φ22
505
460
16-φ22
400
331
485
110
270
181
400
216
540
495
16-φ22
565
515
16-φ26
450
354
512
105
324
170
350
222
595
550
16-φ22
615
565
20-φ26
500
387
542
105
324
170
350
229
645
600
20-φ22
670
620
20-φ26
600
442
612
110
348
188
350
267
755
705
20-φ26
780
725
20-φ30
700
490
660
120
392
210
400
292
860
810
24-φ26
895
840
24-φ30
800
565
750
135
415
240
400
318
975
920
24-φ30
1015
950
24-φ33
900
625
784
150
496
302
520
330
1075
1020
24-φ30
1115
1050
28-φ33
QDH3401-16~25 Worm Gear Drive Metal-Sealed Rotary Ball Valve — Unit: mm
DN
H1
H2
H3
A1
A2
①
L
1.6MPa
2.5MPa
D
D1
n-d
D
D1
n-d
80
120
175
52
144
76
200
114
200
160
8-φ18
200
160
8-φ18
100
140
205
52
144
76
200
127
220
180
8-φ18
235
190
8-φ22
125
160
217
52
144
76
200
140
250
210
8-φ18
270
220
8-φ26
150
180
253
62
167
96
250
140
285
240
8-φ22
300
250
8-φ26
200
200
283
68
188
115
280
152
340
295
12-φ22
360
310
12-φ26
250
245
320
68
188
115
280
165
405
355
12-φ26
425
370
12-φ30
300
264
378
75
215
139
320
178
460
410
12-φ26
485
430
16-φ30
350
296
428
105
254
170
350
190
520
470
16-φ26
555
490
16-φ33
400
331
485
110
270
181
400
216
580
525
16-φ30
620
550
16-φ36
450
354
512
105
324
170
350
222
640
585
20-φ30
670
600
20-φ36
500
387
542
105
324
170
350
229
715
650
20-φ33
730
660
20-φ36
600
442
612
110
348
188
350
267
840
770
20-φ36
845
770
20-φ39
700
490
660
120
392
210
400
292
910
840
24-φ36
960
875
24-φ42
800
565
750
135
415
240
400
318
1025
950
24-φ39
1085
990
24-φ48
900
625
784
150
496
302
520
330
1125
1050
28-φ39
1185
1090
28-φ48
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