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Details Explanation
The ZSHZ/ZDRZ type pneumatic/electric eccentric rotary valve consists of a pneumatic piston actuator or an electric actuator and an eccentric rotary valve. It is a type of angular stroke control valve that controls fluid by rotating a partial ball valve plate around an eccentric axis. The ball core and sealing ring adopt a unique eccentric structure, which has the characteristics of compact structure, good cutting performance, and long service life, and has both adjustment and cutting functions. The sealing grade of metal sealing type is IV and V, and the sealing grade of soft sealing type is VI, achieving zero leakage; The flow characteristics are approximately linear.
Structure and principle of action
The pneumatic eccentric rotary valve consists of a valve body and a pneumatic actuator, and a handwheel mechanism can also be added according to the working conditions. Its structure is as follows:
Figure 1: Schematic diagram of eccentric rotary valve
Figure 2 Schematic diagram of eccentricity of eccentric rotary valve
Material for main parts
| Part name | Material Science |
| Valve body | WCB、CF8、CF8M |
| Ball core | 304, 316, 304 or 316+HCr, 316+STL |
| sealing ring | C-PTFE、 304 or 316+HCr, 316+STL |
| Valve stem | 2Cr13, 17-4PH |
| Pressing ring | 304, 316 |
| Bearing | 316+HCr, 316+STL |
| Packing material | PTFE、 Flexible graphite |
| Bracket | WCB |
Note: The material of the valve body and internal components can be manufactured according to the user's specified standards
Main performance parameters
| Nominal diameter (mm) | 25 | 40 | 50 | 80 | 100 | 150 | 200 | 250 | 300 | |
| Rated flow coefficient Kv | Full cavity type | 12 | 25 | 43 | 115 | 200 | 430 | 730 | 1100 | 1500 |
| 60% cavity | 7 | 15 | 26 | 70 | 120 | 260 | 440 | 670 | 900 | |
| 40% cavity | 4.8 | 10 | 17 | 46 | 80 | 170 | 290 | 450 | 600 | |
| nominal pressure | PN1.6~10.0MPa、Class150~600 | |||||||||
| Traffic characteristics | linear | |||||||||
| Applicable temperature (℃) | -45~400 | |||||||||
| Rated angle (°) | 60 | |||||||||
| sealing form | Soft seal, hard seal | |||||||||
| Inherent adjustable ratio | 100:1 | |||||||||
| Connection form | Clamp type and flange type | |||||||||
| Coating |
When the valve body is made of carbon steel, gray (epoxy resin) When the valve body is made of stainless steel, it is not coated in its natural color |
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Note: 1. Special requirements can be produced according to customer specifications;
2. Flanges can be manufactured according to flange standards such as ANSI and JIS.
The use temperature and pressure range of valve body and valve cover materials, unit: kgf/cm2
|
pressure temperature |
PN16 | PN40 | PN64 | |||
| WCB | CF8 | WCB | CF8 | WCB | CF8 | |
| -196～-20 | — | 16.0 | — | 40.0 | — | 64.0 |
| -20～100 | 16.0 | 16.0 | 40.0 | 40.0 | 64.0 | 64.0 |
| 150 | 16.0 | 16.0 | 40.0 | 40.0 | 64.0 | 64.0 |
| 200 | 16.0 | 16.0 | 40.0 | 40.0 | 64.0 | 64.0 |
| 250 | 14.0 | 15.0 | 36.0 | 38.0 | 56.0 | 60.0 |
| 300 | 12.5 | 14.0 | 32.0 | 36.0 | 50.0 | 56.0 |
| 350 | 11.0 | 13.2 | 28.0 | 34.0 | 45.0 | 53.0 |
| 400 | 10.0 | 12.5 | 25.0 | 32.0 | 40.0 | 50.0 |
| 425 | 9.0 | 12.0 | 22.0 | 30.7 | 36.0 | 48.4 |
| 450 | 6.7 | 11.5 | 17.0 | 29.5 | 26.5 | 46.8 |
| 500 | — | 10.5 | — | 26.5 | — | 42.5 |
| 525 | — | 9.9 | — | 24.6 | — | 39.2 |
| 560 | — | 9.0 | — | 22.0 | — | 36.0 |