SMDF - DNA Pneumatic Wear - Proof Potating Disc Valve ( Inlet Valve / Balance Valve )
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 |
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