Flat Gate Valve What items should be calculated when designing a globe valve?

When designing a flat gate valve, the following items should generally be calculated:

1. The total force on the sealing surface and the calculated specific pressure;

2. The strength of the valve stem (upper stem and lower valve stem);

3. Ram strength;

4. The total force on the sealing surface of the packing box and the calculated specific pressure;

5. The thickness of the stuffing box (stuffing box) and the body box;

6. The strength of the middle flange connection bolt (at room temperature, at the beginning of heating, and at high temperature);

7. Strength of the middle flange;

8. Valve body wall thickness;

9. Bracket strength;

10. a blind plate thickness;

11. The total torque and circumferential force of the handwheel.

1. Valve body wall thickness;

2. The total effect on the sealing surface and the calculation of specific pressure;

3. Stem strength;

4. Disc strength;

5. The strength of the middle flange connecting bolt (at room temperature, at the beginning of heating, at high temperature);

6. Strength of the middle flange;

7. Bonnet strength;

8. Bracket strength;

9. The total torque and circumferential force of the handwheel.

Here are some of the well-known brands recognized in the flat gate valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Answer] :d Analysis] The gate valve has good sealing performance, small fluid resistance, small opening and closing force, and also has a certain performance of adjusting the flow, and can see the opening size of the valve from the lifting height of the valve stem and the low section of the branch head section.

Answer]: C analysis] Compared with the gate valve and the globe valve, the gate valve is labor-saving when opening and closing, the water flow resistance is smaller, the valve body is relatively short, and when the gate valve is fully opened, its valve plate is not subject to the erosion and wear of the flowing medium. However, the disadvantage of the brake is that the tightness is poor, especially when the opening and closing are frequent, the sealing surface between the gate plate and the valve seat is easy to be worn; When it is not fully turned on, the resistance to the flow of water is still greater.

Therefore, the gate valve is generally only used as a cut-off device, that is, it is used in the pipeline that is fully opened or completely closed, and should not be used in the pipeline that needs to be adjusted in size and opened and closed frequently. Envy.

1.For oil and gas transmission pipelines, flat gate valves with single or double gates are selected. If you need to clean the pipeline, choose a single gate or a double gate with a deflector hole and an open rod plate gate valve.

2.For the transportation pipeline and storage equipment of refined oil, the flat gate valve with single or double gate without diversion hole is selected.

3.For oil and gas exploitation wellhead devices, single or double gate valves with dark rod floating valve seats with diversion holes are mostly API16A standards, and the pressure levels are API2000, API3000, API5000, API10000, API15000, and API20000.

4.For pipes with suspended particulate media, knife type flat gate valves are selected.

5.For city gas transmission pipelines, single gate or double gate soft sealing open rod flat gate valve is selected.

6.For urban water projects, single or double gate valves without diversion holes are selected.

1.(class150 900, working temperature -29 121) oil and gas transmission pipelines. Flat gate valves with deflector holes also facilitate line cleaning.

2.Pipelines and storage equipment for finished products and oil.

3.The wellhead device for oil and natural gas exploitation is also a valve for Christmas trees.

4.Pipes for media with suspended particles.

5.The city gas transmission pipeline is in the city.

6.Water works.

A gate valve is a sliding valve that acts as a shut-off on a pipeline and uses a parallel ram. The gate valve closure can be a single gate or a double gate with a break-up mechanism in between. The pressure force of the ram to the seat is controlled by the pressure of the medium acting on the floating gate or the floating seat.

If it is a double-gate flat gate valve, the break-up of the two gates can supplement this compressive force.

The main advantage of the gate valve is that the flow resistance is small, and the flow resistance of the non-shrinking mouth is not much different from the flow resistance of the short pipe. Flat gate valves with deflector holes are installed on the pipeline and can also be cleaned directly with the pipe cleaner. Since the gate plate slides on the seat surface of the two valves of the valve, the fluid energy of the flat gate valve can be applied to the medium with suspended particles, and the sealing surface of the flat gate valve can actually be automatically positioned.

The seat sealing surface of the gate valve will not be damaged by thermal deformation of the valve body. And even if the valve is closed in the cold state, the thermal elongation of the stem will not overload the sealing surface and cause seal leakage. At the same time, when the valve is closed, the flat gate valve without a diversion hole does not require the closing position of the gate plate to have high precision, so the electric flat valve can control the opening and closing position of the valve with stroke.

The disadvantage of the gate valve is that when the medium pressure of the pipeline is too low, the sealing force of the metal sealing surface of the gate valve is not enough to achieve a satisfactory seal. On the contrary, when the medium pressure reaches a certain height, the sealing performance of the valve can be a little better. If the sealing surface is not lubricated by system medium or foreign media, frequent opening and closing may cause excessive wear of the sealing surface of the gate valve.

Another disadvantage is that the circular ram that moves horizontally on the circular seepage channel is only when it is in the 50 of the valve closing position, this kind of valve is more sensitive to the control of the flow rate. Moreover, the ram is encountered.