| Media: | Water |
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| Temperature: | High Temperature |
| Type: | Straight-through |
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| Payment Method: |
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| Initial Payment Full Payment |
| Currency: | US$ |
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| Return&refunds: | You can apply for a refund up to 30 days after receipt of the products. |
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Bellows gate valves belong to the forced sealing type, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak.
When the medium enters the valve body from below the valve disc, the resistance that needs to be overcome by the operating force is the friction force between the valve stem and packing, and the thrust generated by the pressure of the medium.
The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be larger, otherwise the failure of the valve stem top bending will occur.
In recent years, since the emergence of self sealing valves, the medium flow direction of the shut-off valve has shifted from above the valve disc to the valve chamber.
At this time, under the action of medium pressure, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve stem can be correspondingly reduced.
At the same time, under the action of the medium, this type of valve is also relatively tight. The "three modernizations" of valves in China once stipulated that the flow direction of shut-off valves should be from top to bottom.
When the corrugated pipe gate valve is opened, the opening height of the valve disc is 25%~30% of the nominal diameter, and the flow rate has reached its maximum, indicating that the valve has reached the fully open position.
So the fully open position of the shut-off valve should be determined by the stroke of the valve disc. Electric gate valves have sensitive response, safety, and reliability.
Many factories with high control requirements have specially set compressed air stations for pneumatic instrument control components. Electric requires electricity. And a device that can control its flow rate.
| name | description |
| material quality | carbon steel , stainless steel |
| pressure | 0.6mpa~4mpa |
| caliber | DN40~DN450 |
| temperature | -29°C ~425°C |
| medium | water ,Steam ,oil |
| Connection method | flange |
| Driving method | manual,electric,pneumatic |
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