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Found the hand-wheel with forgeable cast iron and increase its friction to convenient for open and close the valve. At the same time, you can also choose impact type hand-wheel. Â
1.      Adopt high nickel ductile iron to manufacture stem nut so that T-type screw thread can cooperate stem to pass moment.
2.      In order to supplement solid lubricating oil termly and reduce on-off torque we set up thrust ball bearing and oil cup on the valve cover. Packing gland and cover are designed fission to assure the stem is concentric.
3.    The packing gland is assembled by knot-graphite, flexible graphite and middle packing ring to ensure the valve no leak and accord with the environment requirement. Â
4.    The connection of valve body and cover is self-sealing structure. At same time cuniform ring fits together with quarto-ring, so that higher pressure, better sealing performance.
5.    The head of stem is whole forged and connected with disc by "T" type trough to ensure the intensity.Â
6.    Jointing structure is adopted on the seat and hard alloy was welded on the sealing surface. All of these can ensure the long time work safe and credible. Â
7.    The material of disc is forge steel or flexible disc which have certain flexible compensation in high pressure condition and make the seal capability credible.Â
8.    Comfortable torque transmission structure.Â
Hand-wheel or impact type hand-wheel transfers the torque to stem by stem nut. The stem is A182F6(1Cr13) which is forged and treated, so its hardness can achieve HB220~250. In order to reduce the wastage in the transmission process, we adopt high nickel ductile iron A439GR.D2 or copper alloy as material of stem nut whose hardness is less about HB50 than stem.
We can add thrust bearing on the stem nut and set up oil cup structure on the large caliber and high pressure valve. If so we can add oil termly and keep it lubricating and make the valve has lighter torque all the time.
 Design and Manufacture Standard
Design and Manufacture:API600 API6D GB12234
Flange:ANSIB16.5 JB/T79 GB9113
Pressure and Temperature:ANSIB16.34 JB/T74 GB9131
Face to Face:ANSIB16.10 GB12221
Butt Welding Connection Size:---
Test:API598 JB/T9092 GB13927
 Install Dimension and Weight
ANSI 900,1500,2500Lb
Â
ANSI 900Lb
ANSI 1500Lb
ANSI 2500Lb
NPS
2
3
4
6
8
2
3
4
6
8
2
3
4
6
L
368
381
457
610
737
368
470
546
705
832
451
368
457
610
H
520
650
750
800
940
615
705
925
1190
1525
520
735
890
1145
D.
250
350
450
500
600
250
350
450
600
710
350
450
600
750
Wt
59
115
198
303
407
116
209
296
720
1257
75
115
215
580
Â
200
450
600
1000
1200
200
450
600
1000
1500
450
750
1500
1800
GB 16.0,25.0MPa
Â
GB 16.0MPa
GB 25.0MPa
DN
50
80
100
150
200
50
80
100
150
200
L
300
390
450
600
750
350
470
550
750
832
H
510
585
630
820
990
496
575
660
790
830
D
360
400
450
640
720
360
400
560
600
720
Wt
73
141
185
462
711
66
123
236
-
-
Â
200
450
600
1000
1200
300
650
1200
1200
1500
API6f Self Sealing Type Wedge Gate Valve
Model NO.: Z41H
Thread Position of Valve Rod: Outside Gate Valve
Usage: Flow Control
Standard: ANSI
Application: Industrial Usage
Trademark: QUANSHUN
Specification: DN50~DN200
Origin: Zhengzhou
Character