Pneumatic eccentric hemispherical valve
I. Introduction:
The pneumatic eccentric hemispherical valve is a high-tech product developed in recent years. With its reasonable design and unique structure, it has the characteristics of small flow resistance, good sealing performance and long service life. It utilizes an eccentric valve body, an eccentric sphere and a valve seat. When the valve stem rotates, it self-centers along a common trajectory. During the closing process, it becomes tighter and tighter, achieving excellent sealing performance. The sphere of the valve is completely separated from the valve seat, eliminating wear on the sealing ring and overcoming the problem of constant wear on the sealing surface of traditional sphere valves. Non-metallic elastic materials are embedded in the metal seat, providing good protection for the metal sealing surface of the valve seat. The eccentric hemisphere is particularly suitable for valves used in industries such as steel, aluminum, textiles, fine solid particles, pulp, coal ash, and liquefied petroleum gas.
II. Product Features:
(1) Small fluid resistance: Full-bore ball valves have almost no flow resistance.
(2) Simple structure, small size and light weight.
(3) Tight and reliable: It has two sealing surfaces, and currently, various plastics are widely used as sealing surface materials for ball valves, ensuring good sealing performance and achieving complete sealing. It is also widely used in vacuum systems.
(4) Convenient operation and quick opening/closing: Only a 90° rotation is required from fully open to fully closed, facilitating remote control.
(5) Easy maintenance: The ball valve has a simple structure, and the sealing rings are generally movable, making disassembly and replacement relatively convenient.
(6) When fully open or fully closed, the sealing surfaces of the sphere and valve seat are isolated from the medium, so the medium will not cause erosion to the sealing surfaces of the valve.
(7) Wide application range: The bore diameter ranges from a few millimeters to several meters, and it can be applied from high vacuum to high pressure.
(8) Due to the wiping action during the opening and closing process of the ball valve, it can be used for media containing suspended solid particles.
III. Performance Range:
|
Material Code |
|||||
WCB |
304 |
316 |
304L |
316L |
321 |
|
ZG230 |
0Cr18Ni9 (CF8) |
1Cr18Ni12Mo2Ti (CF8M) |
00Cr18Ni10 (CF3) |
00Cr17Ni14Mo2 (CF3M) |
ZG7Cr18Ni9T (F347) |
|
Applicable Medium |
Water, oil products, steam |
Nitric acid |
Acetic acid |
Strong oxidizing medium |
Corrosive media such as urea |
Nitric acid |
Test Range (MPa) |
||||||
Item |
Nominal Pressure |
Shell Pressure Test |
Seal Test |
Upper Seal Test |
Low Pressure Seal Test |
Flaw Detection Test |
Test Medium |
Water (MPa) |
Water (MPa) |
Water (MPa) |
Gas (MPa) |
GB/T 6440-1992 |
|
Time |
(s) |
120 |
60 |
60 |
0.5~0.6 |
|
Pressure Test |
1.0 MPa |
1.5 |
1.1 |
1.1 |
||
1.6 MPa |
2.4 |
1.76 |
1.76 |
|||
2.5 MPa |
3.75 |
2.75 |
2.75 |
|||
IV. Parts:
Serial No. |
Name |
Code |
Material |
||
WCB |
304 CF8 |
316 CF8M |
|||
1 |
Valve Body |
WCB ZG230-450 |
0Cr18Ni9 |
0Cr18Ni12Mo2Ti |
|
2 |
Lower End Cover |
Q235-A |
1Cr18Ni9Ti |
0Cr18Ni12Mo2Ti |
|
3 |
Hexagon Socket Head Cap Screw |
GB/T 70-2000 |
Q235-A |
1Cr17Ni2 |
0Cr18Ni12Mo2Ti |
4 |
Lower Fixed Shaft Adjustment Bolt |
Q235-A |
1Cr17Ni2 |
1Cr17Ni2 |
|
5 |
Hexagon Nut |
GB/T 6170-2000 |
Q235-A |
1Cr17Ni2 |
1Cr17Ni2 |
6 |
Lower Gasket |
Stainless steel flexible graphite; PTFE; 316 with flexible graphite lining |
|||
7 |
Lower Bearing |
0Cr18Ni9Ti |
0Cr18Ni9Ti |
0Cr18Ni12Mo2Ti |
|
8 |
Lower Fixed Shaft |
2Cr13 |
304 |
0Cr18Ni12Mo2Ti |
|
9 |
Sphere |
ZG2Cr13 |
0Cr18Ni9 |
0Cr18Ni12Mo2Ti |
|
10 |
Valve Seat Retainer |
Q225-A |
1Cr18Ni9Ti |
0Cr18Ni12Mo2Ti |
|
11 |
Valve Seat |
Q225-A |
PTFE/1Cr18Ni12Mo2Ti |
PTFE/1Cr18Ni12Mo2Ti |
|
12 |
Hexagon Socket Head Cap Screw |
GB/T 70-2000 |
Q235-A |
1Cr17Ni2 |
1Cr17Ni2 |
13 |
Valve Seat Gasket |
Stainless steel flexible graphite |
1Cr17Ni2 |
0Cr18Ni12Mo2Ti |
|
14 |
Valve Stem |
2Cr13 |
1Cr18Ni9Ti |
0Cr18Ni12Mo2Ti |
|
15 |
Upper Bearing |
0Cr18Ni9Ti |
0Cr18Ni9Ti |
0Cr18Ni12Mo2Ti |
|
16 |
Split Ring |
1Cr18Ni9Ti |
1Cr18Ni9Ti |
1Cr18Ni9Ti |
|
| Machinery & Equipment/Valves/Ball Valves | |
