The difference between ceramic knife gate valve and ordinary knife gate valve

Knife Gate ValveAs a common fluid control device, it is widely used in industrial pipeline systems. Among them, ceramic knife gate valves and ordinary metal knife gate valves have significant differences in performance, service life, and applicable scenarios due to differences in material characteristics.

1、 Differences in core materials and manufacturing processes

*Ceramic knife gate valve: Made of high hardness ceramics (such as alumina and silicon carbide), with a hardness close to diamond, a smooth surface, reduced medium flow resistance, wear resistance, and corrosion resistance.

*Ordinary knife gate valve: made of stainless steel, cast iron or alloy steel, with a rough surface, strong resistance to mechanical impact, and good toughness.

2、 Performance comparison and applicable scenarios

1. Wear resistance: Ceramic valves are resistant to solid particle wear and are suitable for mining, thermal power generation, and other scenarios. Metal valves are prone to wear and require frequent replacement of seals.

2. Corrosion resistance: Ceramic valves are resistant to strong acid and alkali corrosion and are suitable for chemical and sewage treatment; Metal valves are affected by corrosion and require regular maintenance.

3. Temperature adaptability: Ceramic valves are resistant to high temperatures, but excessive temperature differences should be avoided; Metal valves are suitable for narrow temperatures, and the cost of special alloys is high.

4. Typical application scenarios: Ceramic valves are suitable for high wear and high corrosion environments such as mining beneficiation, chemical plants, and power plants; Ordinary valves are suitable for low-pressure fluid control in urban water supply and drainage, food processing, and other industries.

3、 Installation and usage precautions

1. Special requirements for ceramic knife gate valves

*It is strictly prohibited to strike the valve body during installation to prevent ceramic components from shattering.

*The pipeline needs to be thoroughly cleaned to avoid scratching the ceramic surface with hard objects such as welding slag.

*It is recommended to pair it with a gentle handwheel or pneumatic actuator to reduce the impact force of opening and closing.

2. Optimization suggestions for ordinary knife gate valves

*316L stainless steel or Hastelloy materials are preferred in corrosive media.

*Graphite fillers can be applied under high temperature conditions, and the food industry requires the use of food grade lubricants to protect the sealing surface.

4、 Key factors for selection

1. Medium characteristics: Ceramic valves must be selected for media containing particles and highly corrosive media.

2. Budget planning: Short term projects or low wear scenarios can prioritize ordinary valves.

3. Maintenance resources: Without a professional maintenance team, the maintenance free feature of ceramic valves is more advantageous.

4. Adverse working conditions: Customized solutions are required for ultra-high temperature (>600 ℃) or high-pressure environments.

Ceramic knife gate valves have become an important solution for high wear and strong corrosion conditions due to their characteristic of "hard grinding"; However, ordinary valves are still irreplaceable in conventional environments, so users should choose based on the above key factors.