high Vacuum Trimming Valves
FAQ
Product Introduction: This series of valves are manually driven precision control valves. They are reasonable in structure design, beautiful in appearance, high precision, small size, practical and reliable, and have good sealing performance. They are used to regulate vacuum and gas flow in vacuum system. The work of the valve is driven by hand turning the adjusting knob, and the needle valve is driven up and down by threaded transmission. The working medium of the valve is air or a few corrosive gases.
Q1:What are the main Technical Parameters?
EVGW series High Vacuum Trimming Valves Technical Parameters
|
Production model |
EVGW-J2 |
EVGW-J4 |
|
|
Application scope |
Pa |
1×10-5Pa～1.2×105Pa |
|
|
DN |
mm |
0.8 |
1.2 |
|
Leak Rate |
Pa·L/s |
≤1.3×10-7 |
|
|
Cycles until first service |
次 times |
3000 |
|
|
Bake-out temperature |
℃ |
≤150 |
|
|
Speed of opening or closing |
s |
Manual drive time |
|
|
Valve position indication |
— |
mechanical instructions |
|
|
Installation position |
— |
Any direction |
|
|
ambient temperature |
℃ |
5~40 |
|
Q 2:What are the Features?
Standardized, modular design, easy to replace and maintain;
Easy-to-clean
Energy-saving, small size.
Q3:What are the flanges’ dimensions?
KF-KF/ KF-Pipe Adapter/ CF-CF
|
规格型号 Model |
DN |
连接 接口 adapter |
外形尺寸（mm） dimensions |
||||||
|
1 |
2 |
A |
B |
C |
D |
E |
F |
||
|
EVGW-J2(KF) |
0.8 |
KF16 |
KF16 |
90 |
30 |
30 |
28 |
45 |
— |
|
EVGW-J2(CF) |
0.8 |
CF16 |
CF16 |
98 |
34 |
35 |
28 |
52 |
— |
|
EVGW-J2（GK） |
0.8 |
KF16 |
管接头 |
90 |
30 |
30 |
28 |
45 |
6 |
|
EVGW-J4(KF) |
1.2 |
KF16 |
KF16 |
93.2 |
30 |
30 |
28 |
45 |
— |
|
EVGW-J4(CF) |
1.2 |
CF16 |
CF16 |
98 |
34 |
35 |
28 |
52 |
— |
|
EVGW-J4(GK) |
1.2 |
KF16 |
管接头 |
90 |
30 |
30 |
28 |
45 |
6 |
Q 4: What are the precautions for use?
a) The valve should first check whether the valve is intact and the accessories are complete.
b) The valve should be kept clean and stored in a dry room and protected from strong vibrations.
c) When the valve is not used for long-term storage, the valve should be in a micro-open state and should be inspected regularly to prevent moisture, rust and aging of rubber parts.
d) Before installation, the surfaces of the valve and vacuum should be cleaned according to vacuum hygiene requirements.
e) The user's flange connected to the valve shall have no protruding welds in the joint hole.
Q5:What are the possible failures and how to eliminate them?
Failures Reason methods
Poor sealing Oil stains adhere to the sealing surface. clean up the dirts.
scratches on the sealing surface. Remove scratches by polishing paper or machine tool.
Damaged rubber seal Replace rubber seal.
Damaged Flexible Hoses Replace or repair-welded.
Q6: Position of DN0.8/DN1.2?
Q7: What are the minimum and maximum regulated flow?
GW-J2(KF)
The minimum adjustable flow is 0.003L/s
The maximum adjustable flow is 0.03L/s;
GW-J4 (KF)
The minimum adjustable flow is 0.0046L/s
The maximum adjustable flow is 0.03~0.08L/s
Q8: Can the interface flange be customized?
At present, there are only three kinds, like KF16, CF16 and pipe Adapter.
Post time: Jun-14-2022