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Some Knowledge Points of Knife Gate Valves

The bottom of the knife shaped gate valve plate has a knife shaped oblique cut, which has the function of cutting off the medium, so that the valve will not be blocked by the medium when closed. Knife gate valves can only be used for cutting off and cannot be used for throttling. gate valves can be throttled or opened/closed. Compared with ordinary gate valves, knife gate valves have a simple structure, small volume, flexible operation, and convenient installation, making them suitable for media with high consistency and solid particles. The full diameter Knife Gate Valve design allows the valve to be used in dirty medium conditions, and the replaceable valve seat and packing make the maintenance of the valve simple. Although knife gate valves have good performance, their prices are generally higher than gate valves.

Characteristics of knife gate valves:

1. The stainless steel valve body is durable, and the design of the valve body reinforcement enhances the strength of the valve body. The use of double headed screws allows for faster opening and closing.

2. The stainless steel gate plate of the knife gate valve can prevent sealing leakage caused by corrosion, and better sealing effect can be achieved through fine grinding and polishing. The bottom of the knife is processed into a blade shape, which can cut soft materials such as fibers, pulp, and wood pulp, and has good opening and closing functions. The upper end of the cutterhead is equipped with a hard polytetrafluoroethylene scraper, which can prevent abrasive substances such as dust and gravel from entering the stuffing box, thereby significantly extending the service life of the disc.

3. The adjustable sealing surface of the ram can scrape off the adhesive on the sealing surface and automatically remove debris.

4. The scientific upper sealing packing box design of the knife gate valve makes the upper sealing effective and durable.

5. Fully circular DC flow channel design, without slag or blockage.

6. Compact design, small footprint, light weight, low price, easy to install, complete wear-resistant and anti blocking measures, easy to maintain, easy to use, long service life, and optional drive device.

7. Short structural lengths can save raw materials and installation space, and can also effectively support pipeline strength.

The triangular bracket saves raw materials and ensures the required mechanical performance.

9. The guide block on the blade gate valve body enables the correct movement of the gate plate. Squeeze the stopper to ensure effective sealing of the gate.

The driving mechanism of the knife gate valve can also be freely selected.

11. The overall blade gate valve is made of stainless steel to prevent corrosion damage. The valve body and packing culvert are both made of good casting, among which the valve body is flange type integral casting, and the materials can be 304, 316, 316L, WCB, 2Crl3 according to user needs. The sealing ring is made of PTFE reinforced polytetrafluoroethylene, which is corrosion-resistant, wear-resistant, and does not drop slag.

12. The valve plate has five support points to ensure good self-alignment. When the valve is closed and subjected to back pressure, the valve plate will not move.

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