SMDF-DNB-J Double Disk Gate Valve Small Starting Load For Ash Conveying System
Production information
Rotating disc valve employs ceramic or hard metal friction pair structure , which makes it more abrasive and better tightness . It just needs a small starting load because the unique structure . Besides , ashes hardly accumulate in the valve body due to the same reason . All these features make the rotating disc valve durable .
Operating Principle
The actuator moves the stem and lever arm a quarter turn which drives the disc . The entire sealing surface of the disc is constantly in contact with the seat or pad through force exerted by coiled springs . These springs allow the disc to move vertically . This compensates for thermal expansion and contraction of the valves components also overcoming the effect of any back pressure for which it was designed and between the sealing surfaces . Differences in tangential disc to seat friction forces cause the disc to rotate on its seat as the valve cycles , thereby shearing and wiping away any process material that may accumulate . All these features make the rotating disc valve durable . It will provide reliable support for your system .
Applications
The rotating disc valve can be used in ash conveying system in thermal power plants. It also can be applied in mine , cement plant , lime work , metallurgic plant , chemical factory and other fields that need to convey caustic or abrasive ash .
Technical Parameters
. Maximum operating pressure: 1.0 MPA
. Maximum test pressure: 1.5 MPA
. Operating temperature: ≤ 200℃
. Leakage test pressure: 1.1 MPA
Installation
1. Prior to installation , please read this manual carefully , and check the pneumatic actuator’s condition .
2. Ensure the flange’s dimension , maximum operating pressure and inside nominal diameter meet the requirements .
3. Do not adjust the bolts and nuts . And make sure the center of two pipelines and valve center are coaxial . Flange surface should be smooth and keep horizontal without relatively large slope , for make sure the valve can fasten and work well . Besides , the bolts should be symmetrically fastened .
4. After installation , pump air into the two air intakes of the pneumatic actuator , and make sure the valve plate work properly .
5. If the control switch is installed , ensure its parameters can meet the external power source and it can work properly in fully open or fully close .
Troubleshooting Method
| Troubles | Cause | Troubleshooting Method |
| Leakage | Foreign body | Remove foreign body |
| Seal washer is invalid | Replace seal washer |
| Valve core abrasion | Replace valve core |
| Valve cannot open or close | Rotatable parts become flexible or invalid | Adjust or replace the relative parts |
| Insufficient pressure or leakage | Check and repair supply air line |
| Pneumatic components become ageing or invalid | Replace the relative pneumatic components |
Installation dimension and outline
| DN | H | D | K | d | n-C |
| 150*150 | 310 | 285 | 240 | 210 | 8-Φ22 |
| 200*200 | 310 | 340 | 295 | 265 | 8-Φ22 |
| 225*225 | 310 | 370 | 325 | 295 | 8-Φ22 |
| 250*250 | 330 | 395 | 350 | 320 | 12-Φ22 |
| 300*300 | 330 | 445 | 400 | 368 | 12-Φ22 |
| 200*350 | 310 | 520 | 470 | 265 | 8-Φ22 |
Main Components and materials
| NO. | Item | Material | NO. | Item | Material |
| 1 | Upper valve body | Ductile cast iron | 5 | Under valve body | Ductile cast iron |
| 2 | Seal ring | Ceramic or alloy | 6 | Rotating shaft | 45# Steel |
| 3 | Valve plate | Ceramic or alloy | 7 | Rotary arm | Ductile cast iron |
| 4 | Swing arm | Ductile cast iron | 8 | Pneumatic actuator | Aluminum |
Product Tags:
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SMDF-DNB-J Double Disk Gate Valve Small Starting Load For Ash Conveying System Images
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