What are the characteristics and advantages of resilient seated gate valves?
The opening and closing part of the elastic seat-sealed gate valve is a gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled.
1. The specifications and categories of resilient seated gate valves should meet the requirements of the pipeline design documents.
2. The model of the elastic seat seal gate valve should be marked with the national standard number requirement. If it is a corporate standard, the relevant description of the model should be indicated.
3. The working pressure of the elastic seated gate valve is required to be ≥ the working pressure of the pipeline. Under the premise of not affecting the price, the pressure that the valve can bear should be greater than the actual working pressure of the pipeline; any side of the elastic seated gate valve should be closed Can withstand 1.1 times the valve working pressure without leakage; when the valve is open, the valve body should be able to withstand twice the valve working pressure.
4. The manufacturing standard of flexible seat seal gate valve should state the national standard number on which it is based. If it is a corporate standard, the purchase contract should be accompanied by corporate documents. This type of valve should generally be installed horizontally in the pipeline.
Application of Resilient Seat Seal Gate Valve
It is widely used in fluid pipelines such as tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electric power, shipbuilding, metallurgy, and energy systems as regulating and intercepting devices.
Features of Resilient Seat Seal Gate Valve
1. Flat-bottomed valve seat, no dirt accumulation, making the seal more reliable.
2. The gate is entirely covered with nitrile rubber, and the internal parts of the valve are made of corrosion-resistant and rust-resistant steel and copper alloy materials, which can be used in sewage systems to adapt to harsh working environments
3. Small size, light weight, easy to install and maintain.
4. The valve stem is sealed with three O-rings, which greatly reduces the frictional resistance when switching, and the switch is light and water-proof.
Advantages of elastic seat seal gate valve
When the elastic seated gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, only rely 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 gate valves adopt forced sealing, that is, when the gate valve is closed, the gate must be forced against the seat by external force to ensure the sealing performance of the sealing surface.
When the gate valve is opened, when the lift height of the gate is equal to 1:1 times the diameter of the gate valve, the fluid passage is completely unblocked, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a mark, that is, the position where it cannot be opened, as its fully open position. In order to consider the lock-up phenomenon caused by temperature changes, it is usually opened to the top position, and then back 1/2-1 circle, as the position of the fully open gate valve. Therefore, the fully open position of the gate valve is determined according to the position of the gate (ie stroke>. The sealing surface is easy to wear and affects the service life. When opening and closing, the two sealing surfaces of the gate and the valve seat rub against each other, and the medium pressure is required It is easy to cause abrasion and abrasion, which will affect the sealing performance and shorten the service life.
The general gate valves used in the market for a long time generally have water leakage or rust, which overcomes the defects of general gate valves such as poor sealing and rust. The elastic seat seal gate valve uses the compensation effect of the elastic gate plate to produce a small amount of elastic deformation to achieve a good sealing effect. It has the obvious advantages of light switch, reliable sealing, good elastic memory and service life. It can be widely used as a regulating and intercepting device on the pipelines of tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electric power, shipbuilding, metallurgy, energy system, etc. This is the advantage and advantage of the elastic seat seal gate valve.
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