How to select material for knife gate valve
In the domestic pipeline system, the utilization rate of knife gate valve is not very high, but as a general gate valve, its importance is self-evident. As one of the valves that cut off the value flow in the pipeline system, its material and performance will be affected to a certain extent. By the attention of the majority of manufacturers and users.
It has become the consensus of many valve manufacturers to select valve manufacturing materials according to different circulating media and different use environments, but there are certain differences in the material selection of knife gate valves. Due to its own functions and performance, carbon steel and stainless steel will be used as the main manufacturing materials in most cases, rather than alloy materials or even engineering plastics used in other valves. The valve body itself requires strength and hardness, so the valve body is mainly made of carbon steel. The obvious advantage of carbon steel is the hardness and strength brought about by its carbon content. Since the gate valve is often in contact with liquid media, the material of the knife gate valve should be corrosion-resistant stainless steel.
Knife gate valve maintenance
1. In order to ensure the service life, the material used for the knife gate valve actually needs to be selected according to the working conditions, that is to say, it can be manufactured in a customized form.
2. During use, it should be cleaned regularly. And do regular lubrication measures.
3. Due to the particularity of the gate, the stress is relatively large, so special attention should be paid to the material selection of the sealing surface and the valve stem. The strength and load of these two parts will affect the performance of the entire valve.
4. When installing in the open air, pay attention to waterproof measures to avoid external corrosion caused by rain erosion. The valve should also take certain protective measures, because external dust and solid impurities will scratch and damage the valve anyway.
5. If the installation location is offshore, the corrosion of the valve housing by sea water and sea breeze should also be considered. In this regard, it is recommended to use an improved metal or ceramic material resistant to acid, alkali and salt corrosion as the main material of the valve body.