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When is knife gate valve used?

2024-03-06

Knife gate valve is a commonly used valve type, its main characteristics are simple structure, small size, light weight, good sealing, corrosion resistance, flexible operation and other advantages, is widely used in various industrial fields, especially in mining, metallurgy, chemical industry, sewage treatment and other fields have been widely used.

Knife gate valve is also known as knife gate valve, slurry valve, mud valve, its opening and closing parts are gate, the direction of motion of the gate is perpendicular to the direction of fluid, by cutting fiber material blade shaped gate to cut off the medium, gate has two sealing surface, the most commonly used mode gate valve two sealing surface form wedge, wedge angle varies with the valve parameters, usually 5°, the gate plate of the wedge knife gate valve can be made into a whole, called the rigid gate plate; It can also be made to produce a micro deformation of the ram, in order to improve its processability, make up for the sealing surface angle in the processing of the deviation, this ram is called elastic ram.

The valve body does not actually have a chamber, the gate is raised and lowered in the side guide groove, and is pressed against the seat by the bottom lug. If high dielectric sealing is required, the O-seal seat can be used to achieve a two-way seal.

Knife gate valve has a small installation space, low working pressure, not easy to accumulate debris, low price.

When the knife gate valve is closed, the sealing surface can only be sealed by the medium pressure, that is, the medium pressure will press the sealing surface of the gate plate to the seat on the other side to ensure the sealing surface, which is self-sealing, most of the gate valve is forced to seal, that is, when the valve is closed, it must rely on external force to force the gate plate to the seat to ensure the sealing surface.

Knife gate valve drive mode: manual, sprocket, electric, pneumatic, hydraulic, bevel gear, electronic hydraulic and gas hydraulic drive mode.

Knife gate valve appearance: open rod, dark rod two kinds.

Knife gate valve material: cast iron, cast steel, carbon steel, stainless steel, fluorine lined, etc.

Knife gate valve seal: hard seal, soft seal, single-sided seal, double-sided seal and other materials seal.

Ultra-thin knife gate valve with its small size, small flow resistance, light weight, easy to install, easy to disassemble and other advantages completely solve the ordinary gate valve, flat gate valve, ball valve, globe valve, regulating valve, butterfly valve and other valves of large flow resistance, large weight, difficult installation, occupy a large area and other difficult problems.

Knife gate valve application scope:

1. Petrochemical and refining industries: mainly used for conveying oil, natural gas, hydrogen, gas and various chemical media pipeline system bugs.

2. Food, beverage and pharmaceutical industries: Knife gate valves also play an indispensable role in the pipeline system for conveying liquids such as food, beverages, pharmaceuticals and cosmetics.

3. Water treatment industry: Knife gate valves can be used in sewage treatment, water supply, drainage and pumping systems to control and regulate water flow, water pressure, etc.

4. Air conditioning, heating and ventilation systems: Knife gate valves can be used in duct systems in air conditioning, heating and ventilation systems to control and regulate airflow and water flow.

Knife gate valve performance:

1. Valve control can be local and remote control, and remote position display and remote centralized control can also be achieved according to user requirements.

2. Light weight: the body is made of carbon steel, the weight is reduced by about 20%-30% compared with the traditional gate valve, and the installation and maintenance are convenient.

3. The use of the valve can improve the closing and sealing performance of the transmission pipeline system, minimize leakage, improve production efficiency, and protect the environment will play a positive role in promoting.

4. The sealing surface is made of high wear-resistant and corrosion-resistant ceramic material, with Mosaic technology, high corrosion resistance and good wear resistance, so that the valve has a long life and the cost performance is 10 times higher than that of ordinary valves.

Characteristics of knife gate valve:

1. The lifting shutter sealing surface can scrape the adhesive on the sealing surface and automatically clean up the debris.

2. Stainless steel ram can prevent seal leakage caused by corrosion.

3. Hard all-gold sealing surface can ensure sealing wear resistance and requirements.

4. The sealing surface of the valve body has no groove, no accumulation, and can ensure flexible opening.

5. Short structural length, which can save raw materials, installation space and effectively support pipeline strength.

6. Scientific upper sealing stuffing box design, make the upper sealing safe and effective, durable.

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

8. The guide block on the valve body enables the correct movement of the gate, and the four extrusion blocks ensure the effective sealing of the gate.

9. Valve body reinforcement design to improve the strength of the valve body.

10. The stainless steel stem is durable, and the stud makes the opening and closing faster.

11. Optional drive mechanism.

12. More than 150 caliber, the use of fully closed structure, more effective opening and prevent leakage.

13. Fluorine rubber sealing surface can achieve sealing effect and improve the use temperature.

14. The rubber sealing surface is directly vulcanized in the valve body and will not fall off.

Advantages of knife gate valve:

1. Simple structure: electric knife gate valve is mainly composed of valve body, valve plate, valve stem, electric actuator, etc., simple structure, easy to maintain and maintain.

2. Easy operation: electric knife gate valve can be remotely controlled by electric actuator to realize switching operation, easy and fast operation.

3. Good sealing performance: The sealing performance of the electric knife gate valve is good, which can effectively prevent media leakage and ensure the normal operation of the system.

4. Long service life: the material selection of electric knife gate valve is strict, and after special treatment, it can effectively improve its service life.

5. Fast cutting ability: The blade structure of the knife gate valve makes it possible to quickly cut off the medium. When a pipe system needs to be shut down quickly or for emergency repairs, knife gate valves respond quickly and cut off the flow of media.

6. Strong wear resistance: the blade and seat of the knife gate valve are usually made of wear-resistant materials, with good wear resistance. This makes knife gate valves more reliable when handling media containing particulate matter, reducing wear and leakage problems.

7. High temperature and high pressure applications: compared with some other valve types, knife gate valves have better adaptability under high temperature and high pressure media. Due to the large contact area between the blade and the seat, the knife gate valve can withstand higher operating temperatures and pressures.

Precautions for the use of knife gate valve:

1. Before installation, check whether the valve components are intact, whether there is damage or loosening. The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.

2. The installation should be carried out according to the requirements to ensure that the valve is installed in the correct position to avoid deviation or uneven phenomenon.

3. Pay attention to the operation of the valve during use. If any abnormality is found, stop using it immediately and check it.

4. Regular maintenance and maintenance of the valve to ensure its normal operation and service life, if the valve is often switched on and off, at least once a month lubrication.

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