How to choose the right knife gate valve type

1. Medium characteristics

The first thing to consider is the physical and chemical properties of the medium. If the medium is highly corrosive, such as chemical solutions such as sulfuric acid and hydrochloric acid, it is necessary to choose a knife gate valve made of corrosion-resistant materials, such as valves made of stainless steel, ceramics, etc. For media containing particles or fibers, such as pulp, ore pulp, etc., knife gate valves with good wear resistance and anti-clogging capabilities should be selected. Valves with knife-type gate designs can better cut off the medium and prevent particle accumulation from affecting the normal operation of the valve.

2. Working pressure and temperature

Under high-pressure environments, valves need to have sufficient strength and sealing, and knife gate valves with rated pressures that meet system requirements should be selected. For high-temperature media, valve materials need to have good thermal stability to avoid valve deformation or seal failure due to temperature changes. For example, in high-temperature steam systems, high-temperature resistant alloy knife gate valves should be selected.

3. Diameter size

Choose the appropriate knife gate valve diameter according to the diameter of the pipeline. If the valve diameter does not match the pipeline, it may affect the flow and flow rate of the medium, and even cause hydraulic imbalance in the pipeline system. Generally speaking, the valve caliber should be consistent with or close to the pipeline caliber.

4. Operation mode

The operation modes of knife gate valves include manual, electric, pneumatic and other modes. Manual knife gate valves are suitable for occasions where operation is not frequent and control accuracy is not high; electric knife gate valves can realize remote control and automatic operation, and are suitable for large pipeline systems and places that require precise control; pneumatic knife gate valves have the characteristics of rapid action, safety and reliability, and are often used in dangerous environments such as flammable and explosive.

5. Sealing performance

Good sealing performance is the key to ensuring the normal operation of valves. For occasions with strict sealing requirements, such as gas delivery systems, knife gate valves with high sealing grades should be selected, such as valves with rubber seals or metal hard seals, to prevent medium leakage.

Choosing the appropriate type of knife gate valve requires comprehensive consideration of factors such as medium characteristics, working pressure and temperature, caliber size, operation mode and sealing performance. Only by comprehensively weighing these factors can the knife gate valve that best meets actual needs be selected.