Knife gate valve
Profile

Knife gate valve opening and closing part is the gate, the movement direction of the gate is perpendicular to the direction of the fluid, by cutting fiber material blade shaped gate to cut off the medium, The gate plate has two sealing faces. The two sealing faces of the most commonly used mode gate valve form a wedge. The wedge Angle varies with the valve parameters, usually 50. It can also be made into a gate that can produce trace deformation to improve its technology and make up for the deviation of the sealing surface Angle in the process of processing. This gate is called elastic gate. In fact, there is no chamber in the valve body, the gate in the side guide groove lifting, and by the bottom of the lug pressed on the valve seat, such as the need to achieve a higher medium sealing, can choose O-shaped sealing valve seat to achieve two-way sealing. Knife gate valve has small installation space, low working pressure, not easy to accumulate debris, low price.

When the knife gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, rely on the medium pressure to press the sealing surface of the gate to the other side of the valve seat to ensure the sealing surface, which is self-sealing. Most knife gate valves are forced to seal, that is, when the valve is closed, it is necessary to rely on external force to force the gate to the valve seat to ensure the sealing surface of the sealing. This type of valve shall generally be installed horizontally in the pipeline.

1, Lifting gate sealing surface, can scrape the adhesive on the sealing surface, automatic cleaning debris.

  1. Stainless steel gate can prevent sealing leakage caused by corrosion.

3, hard alloy sealing surface can match the sealing wear resistance and requirements.

  1. The sealing surface of the valve body has no grooves and does not produce storage, which canensure the flexible opening.

5, short structure length is short, can save raw materials, installation space also effectively support the strength of the pipeline.

nominal diameter  

DN(mm)

40~1200

nominal pressure

PN(MPa)

0.6~1.0

 nominal pressure (MPa)

 

strength test

0.9~1.5

seal test

0.66~1.1

parts

 

Valve body

Gray cast iron, ductile iron, carbon steel、CF8、CF8M、CF3M

Valve seat

VITON、EPDM、NBR

Valve plate

Nodular cast iron, carbon steel、CF8、CF8M、CF3M

Stem

SS

filler

PTFE/Flexible Graphite

Applicable medium

Impurity-containing media such as cement slurry, sand ore pulp, paper pulp, and fiber pulp in the mine pipeline

Connection Type

Wafer type, flange type

DN

Connect size

L

D

D1

D2

H

N-M

d

50

48

160

125

100

285

4-M16

18

65

48

180

145

120

298

4-M16

18

80

51

195

160

135

315

4-M16

18

100

51

215

180

155

365

8-M16

18

125

57

245

210

185

400

8-M16

18

150

57

280

240

210

475

8-M20

22

200

70

335

295

265

540

8-M20

22

250

70

390

350

320

630

12-M20

22

300

76

440

400

368

780

12-M20

22

350

76

500

460

428

885

16-M20

22

400

89

565

515

482

990

16-M22

24

450

89

615

565

532

1100

20-M22

24

500

114

670

620

585

1200

20-M22

24

600

114

780

725

685

1450

20-M27

30

700

158

895

840

800

1700

24-M27

30

800

165

1010

950

898

2000

24-M30

30

900

203

1110

1050

1005

2300

28-M30

30

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