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Polyurethane seal knife gate valve

Product Overview

The valve is fully lined with wear-resistant polyurethane valve liner with integral mold injection, and all media are wrapped in the polyurethane valve liner to achieve wear protection without dead Angle.The seat and plate are designed to be self-flushing in a unique manner, preventing deposition and jamming during closure.The valve chamber is equipped with a scraper to clean the valve plate to reduce the torsion bar and prevent caking.
Easy to replace the worn parts, valve liner and valve plate can be replaced on site, high efficiency and energy saving.

Structural characteristics

1. Full bore: This valve is a full bore cut-off valve. After opening, the valve plate is completely lifted to the inside of the valve chamber. The valve plate does not directly contact with the medium, so as to avoid the wear of the valve plate caused by the erosion of the medium.
2. Two way sealing: the flow direction of the medium should be confirmed during the installation of the valve, which can achieve zero leakage under the positive full pressure and zero leakage under the reverse pressure of ≤ 50%.
3. Upper seal: the wear-resistant natural rubber with bevel design is adopted, and the self-lubricating PTFE is embedded to ensure the sealing, reduce the friction resistance of the packing, and provide extraordinary service life.
4. Wear resistant polyurethane lining: the lining adopts integral casting polyurethane elastomer, providing ultra long wear resistance life. In addition, this lining can be replaced, we will provide technical guidance, or to the designated site for you to replace.
5. Valve plate: wear resistant stainless steel plate can be used for various types of wear-resistant surface treatment. The valve plate can also be replaced
6. This valve is a medium cut-off valve and is not recommended to be used as a flow regulating valve. It will shorten the service life of the valve if it is used as a regulating valve.

Using range

1. Mining: ball mill, cyclone, flotation, magnetic separation, tailing reduction, concentration. (chert / iron ore, copper concentrate / tailings, gold, soda ash, phosphate rock, lead, coal, cement, lime / limestone)
2. Coal washing. (slime separation)
3. Papermaking
4. Slag removal
5. Electric power, flue gas desulfurization, fuel transportation
6. Sand water mixture
7. Sewage treatment

Installation Precautions

1. Before using, please confirm whether the inner diameter of flange and pipe is matched with the valve.
2. Please use butt welding or socket welding FF flat flange. (flat flange is a good choice)
3. Please use hard full flange gasket. (we can provide supporting facilities)
4. Clean the valve seat and add lubricant to the sealing surface before installation.
5. Please pay attention to the flow direction of medium. (the valve is a two-way sealing valve, but the flow direction of the medium should be paid attention to, and the reflux pressure should be ≤ 50% of the positive flow pressure)
6. Pay attention to the thread depth of flange hole on valve body during installation. The bolt locking depth shall not exceed the large depth indicated on the valve body, so as to prevent pipeline leakage due to the failure of flange locking.
7. The packing gland can be adjusted manually. In case of packing leakage or excessive valve operation torque, the packing gland can be adjusted appropriately.
8. Polyurethane bushing, valve plate, packing and other accessories can be replaced on site.
9. If you need to purchase accessories, please check the factory number on the product, and we will provide the corresponding accessories according to the number.
10. Do not weld the valve directly with the pipe after connecting with the flange. The high temperature generated by welding will damage the internal structure of the valve.
The previous one: Hydraulic all polyurethane knife gate valve; the next one: pneumatic fully lined polyurethane knife gate valve

Product Dimensions


PN(MPa)


DN(mm)

L

D

D1

D2

H

N-M

D0

DMZ573X-6/10/16    DMZ573F-6/10/16    DMZ573H-6/10/16    DMZ573Y-6/10/16

1.0

150

70

285

240

212

730

8-M20

280

200

80

340

295

268

910

8-M20

360

250

85

395

350

320

1050

12-M20

360

300

100

445

400

370

1265

12-M20

400

350

100

505

460

430

1470

16-M20

400

400

110

565

515

482

1630

16-M24

400

450

120

615

565

532

1810

20-M24

530

500

130

670

620

585

1970

20-M24

530

600

140

780

725

685

2290

20-M27

600

700

165

895

840

800

2560

24-M27

600

800

190

1015

950

905

2990

24-M30

680

900

200

1115

1050

1005

3200

28-M30

680

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