Introduction to the Application, Installation and Use of Knife Gate Valve

Ⅰ. What is a knife gate valve?

Knife gate valve is also called knife gate valve. Its structural feature is that the bottom of the valve plate of the knife gate valve has an oblique cut like a knife edge. block. Knife gate valves are usually used in medium pipelines such as pulp, slag, coal ash, sewage, chemical raw materials, etc., to be fully open and fully closed.

Ⅱ. Scope of knife gate valve application:

The appearance of the knife gate valve solves the problems of heavy weight, large flow resistance, large area and difficult installation of ordinary gate valves. It can replace the general shut-off valve, and can be used under the working pressure of 1.0MPa-2.5MPa and the operating temperature of -29℃~550℃. Work. The gate of the knife gate valve has a shearing function, which can scrape off the adhesion on the sealing surface and automatically remove the sundries. The stainless steel gate can prevent seal leakage caused by corrosion.

1. Mining, coal washing, iron and steel industry - used for coal washing pipelines, slurry filtering pipelines, etc., ash discharge pipelines;

2. Purification device - used for waste water, mud, dirt and clarified water with suspended solids;

3. Knife gate valve paper industry - used for any concentration of pulp, material and water mixture;

4. Power station ash removal - used for ash slurry.

Knife gate valve is used in coal preparation, slag discharge, urban sewage treatment, food, paper, medicine, petroleum, chemical and other oil, water and steam pipelines in mining power plants, connecting or cutting off cement slurry and gold ore powder in the pipeline. , ore, slag, coal slime, pulp, wood pulp, tailings, fiber, dust, chemical treatment sewage, sedimentation tank, asphalt, silo outlet, fruit, grain, slaughterhouse wastewater and other media.

Ⅲ. The knife gate valve installation orientation:

1. Before installing the knife gate valve, check whether the valve model is consistent with the working conditions.

2. For soft seals such as rubber and PTFE, it is necessary to check whether there is any debris in the inner cavity and sealing surface of the knife gate valve. If there is, it must be cleaned.

3. Before installing the knife gate valve, the necessary space for the valve drive device must be considered.

4. Knife gate valves have been debugged when they leave the factory. In order to prevent wiring errors, first manually open the valve to the half-open state, and then turn on the power supply for no-load test opening.

5. The air source of the gas (liquid) valve must ensure sufficient gas (liquid) pressure.

6. All bolts should be tightened evenly when installing the knife gate valve.

7. Do not strongly impact the knife gate valve or twist the valve parts arbitrarily during installation.

8. If the sealing part of the knife gate valve is exposed, it must be filled with sealing grease regularly.

In relatively dry areas, when the valve drive device of the knife gate valve is a spur gear, it must be regularly filled with lubricating oil.

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