Self-sealing knife gate valve KZM

Valves of this type should generally be installed horizontally in piping systems.

Keyword: Self-sealing knife gate valve KZM

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Anti-crystallization series

Self-sealing knife gate valve

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When a gate valve is closed, the sealing surfaces rely solely on the pressure of the medium to achieve a seal—specifically, the sealing surface of the gate is pressed against the valve seat on the opposite side by the medium’s pressure, thereby ensuring a tight seal. This type of sealing is known as self-sealing. By contrast, most gate valves employ forced sealing: when the valve is closed, an external force is used to press the gate against the valve seat, guaranteeing the sealing performance of the sealing surfaces. Such valves should be installed vertically in the pipeline.

Performance

1. The valve can be locally and remotely controlled according to user requirements, and can also provide remote and centralized display.

2. Lightweight: The valve body is made of carbon steel, making it approximately 20%–30% lighter than conventional gate valves, which facilitates installation and maintenance.

3. Using this type of valve can enhance the sealing performance of pipeline systems, minimizing leaks to the greatest extent possible, thereby playing a positive role in improving production efficiency and protecting the environment.

4. The sealing surface is designed with a highly wear-resistant and corrosion-resistant ceramic composite material, using an inlaid technology. This results in superior corrosion resistance and excellent wear resistance, significantly extending the service life of China’s valves and increasing their cost-effectiveness by a factor of 10 compared to conventional valves.

■ Through-type plug valve

A through-type plug valve is a type of valve in which the gate and the valve seat maintain constant, tight contact for sealing. The principle behind this valve is that the gate is equipped with a circular opening whose diameter matches the nominal bore size. By opening and closing the gate, this circular opening on the gate fully disengages from and then re-engages with the nominal bore. The advantage of this valve lies in its body design, which features a smooth, unobstructed bore without any grooves, ensuring that the medium cannot become jammed or blocked. Additionally, the valve boasts full-bore flow characteristics, making it ideal for use in pipelines carrying powdered or granular media. Its sealing structure can be either soft-seal or hard-seal.

■Self-sealing

The self-sealing knife gate valve gets its name from the fact that its seat automatically rebounds to seal or open in response to the opening and closing of the gate.

1. The valve seat of its product is made from pure imported natural rubber through hot pressing, offering excellent wear resistance and stable resilience and elongation performance.

2. The rubber core embedded with a double-layer elastic metal ring significantly enhances the rubber's wear resistance and resilient sealing performance.

3. The symmetrical dual-rubber valve seat design provides all-around isolation of the valve cavity, effectively preventing media from entering the cavity and causing issues such as difficult operation and sticking.

4. The valve cavity flow path adopts a straight-through design, creating a flow path that prevents residue accumulation, leaves no residue behind, and avoids jamming of debris. This design is particularly well-suited for applications involving media containing dust, solid particles, gas-liquid mixtures, or substances prone to crystallization.

5. The valve can be equipped with a whistle port and comes with a built-in bottom ash discharge inspection port, allowing for continuous online cleaning of the valve cavity and maintenance operations at all times.

All valve components are standardized and modularly assembled, allowing for individual maintenance or replacement.

Open the valve:

When the valve handwheel is rotated counterclockwise. When opening the valve The valve seat rubber is subjected to internal... Departmental elastic steel ring and its own elasticity effect Resonate , as the valve plate gradually rises, simultaneously Synchronized closing valve seat rubber , the valve seat with This sealing medium will not leak into the valve cavity. Internal 。 When the valve is fully open. Status time The valve disc is completely separated from the valve seat rubber and concealed within the valve cavity, thereby ensuring that the valve body’s flow path achieves a fully sealed condition and preventing the medium from leaking into the valve cavity.

Close the valve:

When the valve handwheel is rotated clockwise. When closing the valve , as the gate plate's cone A shaped cross-section passes through the rubber valve seat. , to oak The adhesive forms pressure, causing the rubber to follow the valve plate. Gradually close while simultaneously opening the valve seat. Rubber ， When the valve is fully closed. Status time The valve disc and valve seat are completely rubberized. Full lamination ， This ensures the flow passage of the valve body.

Achieve a fully sealed state to prevent medium leakage and backflow under negative pressure.

Valve installation is shown in the diagram.

Schematic diagram of required accompanying components:

For blind hole installation, use the matching component: short external hexagonal bolt. *n Hexagon nut *n Flat washer or spring washer *n
Through-hole installation using matching components: long external hexagonal bolt *n Hexagon nut *n Flat washer or spring washer *n
Metal-wound gasket or rubber gasket *2 Each valve per piece
Torque wrench *2

Note: n the number of = For the number of bolt holes and bolt lengths, please consult our technical staff.