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Precautions and models in the use of manual knife gate valve products: It entered my country from the 1980s. In less than two decades, its use has expanded from the general field to a wider variety of industries. Coal preparation, gangue discharge and slag discharge from mining power plants. It has developed to urban sewage treatment, and has developed from general industrial pipelines to professional pipeline systems such as food, sanitation, and medicine. The ultra-thin knife gate valve completely solves the large flow resistance of ordinary gate valves, flat gate valves, ball valves, globe valves, regulating valves, butterfly valves and other valves with its advantages of small size, small flow resistance, light weight, easy installation and easy disassembly , heavy weight, difficult installation, large floor space and other difficult problems. After the appearance of the knife gate valve, a large number of general-purpose shut-off valves and regulating valves have been replaced by them. Today, the world's largest use of knife gate valve is the United States and Japan.
Precautions and features in the use of manual knife gate valve products: The opening and closing part of the knife gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The knife gate valve can only be fully opened and fully closed, and cannot be adjusted. and throttling. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50. The gate of the wedge type knife gate valve can be made into a whole, called Rigid gate; it can also be made into a gate that can produce slight deformation to improve its craftsmanship and make up for the deviation of the sealing surface angle during processing. This gate is called an elastic gate. When the knife gate valve is closed, the sealing surface It can only rely on the medium pressure to seal, that is, relying on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most knife gate valves are forced to seal, that is When the valve is closed, the gate must be forced against the valve seat by external force to ensure the tightness of the sealing surface.
Working performance and installation:
The manual knife gate valve has the advantages of simple and compact structure, reasonable design, light weight and material saving, reliable sealing, light and flexible operation, small size, smooth passage, small flow resistance, light weight, easy installation and disassembly, etc. It can be operated at a working pressure of 1.0MPa -2.5MPa, it works normally when the temperature is -29-650℃. The gate of the knife gate valve has a shearing function, which can scrape off the adhesive on the sealing surface and automatically remove the sundries. The stainless steel gate can prevent the seal leakage caused by corrosion. This type of valve should generally be installed horizontally in the pipeline.
Installation and use of manual knife gate valve
1. Before installation, check the valve cavity and sealing surface, and do not allow dirt or sand to adhere;
2. The bolts of each connection part should be tightened evenly;
3. Check that the packing part is required to be pressed tightly, not only to ensure the sealing of the packing, but also to ensure the flexible opening of the gate;
4. Before installing the valve, the user must check the valve model, connection size and pay attention to the flow direction of the medium to ensure the consistency with the valve requirements;
5. When installing the valve, the user must reserve the necessary space for the valve drive;
6. The wiring of the drive device must be carried out according to the circuit diagram;
7. The knife gate valve must be maintained regularly, and must not be collided and squeezed at will, so as not to affect the sealing.
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