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Slika od Yunyin Ding
od Yunyin Ding - ponedeljek, 22. junij 2020, 08:37
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Stop valve, also known as the shut-off valve, is one of the most widely used valves. The reason why it is so popular is that the friction between the sealing surfaces during opening and closing is small, more durable, the opening height is not large, and the manufacturing is easy. Easy maintenance, not only suitable for medium and low pressure but also suitable for high pressure. The shut-off valve is a force-sealed valve, so when the valve is closed, pressure must be applied to the clapper to force the sealing surface to not leak.

The working principle of the stop valve: The valve plays an important role in cutting off and throttling the medium in the pipeline. As a very important shut-off valve, the stop valve is sealed by applying torque to the valve stem. The pressure is applied to the valve flap in the axial direction so that the sealing surface of the valve flap and the sealing surface of the valve seat closely fit together to prevent the medium from leaking along the gap between the sealing surfaces.

Stop Valve

The sealing of the stop valve is composed of the valve disc sealing surface and the valve seat sealing surface, and the valve stem drives the valve disc to move vertically along the centerline of the valve seat. During the opening and closing process of the stop valve, the opening height is small, easy to adjust the flow, and easy to manufacture and maintain, with a wide range of pressure application.

Compared with another gate valve, one of the commonly used shut-off valves in industrial production, from the structural point of view, the stop valve is simpler than the former, which is convenient for manufacturing and maintenance. In terms of service life, the sealing surface of the stop valve is not easy to be worn and scratched. During the opening and closing of the valve, there is no relative sliding between the valve flap and the sealing surface of the seat. The service life shut-off valve of the auxiliary valve has a small flap stroke in the fully closed process, and its height is smaller than other valves. The disadvantage of the stop valve is that the opening and closing torque are large and it is difficult to achieve rapid opening and closing. Because the flow path in the valve body is relatively tortuous, the fluid flow resistance is large, resulting in a large loss of fluid power in the pipeline.

The above information is provided by the shut-off valve factory.



 
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Valve products have more than 3500 varieties and more than 4000 specifications. It can be seen that there are many types of valves! On the refrigeration system piping, 99% will be equipped with valves. As one of the four major parts of the refrigeration system, the throttle valve also plays a decisive role in the operation of the refrigeration system. So today, the refrigeration valve factory will summarize and summarize the valves in our refrigeration system for everyone.

In general, the valve is the control component in the fluid delivery system. Often responsible for cut-off, regulation, diversion, prevention of reverse flow, voltage regulation, shunt or overflow pressure relief, etc.

According to the purpose and function, it can be roughly divided into the following categories:

1. Cut-off type: mainly used to cut or connect the medium flow. Such as the gate valve, globe valve, ball valve, butterfly valve, solenoid valve.

2. Non-return type: used to prevent the backflow of media. Such as check valves of various structures.

3. Adjustment type: adjust the pressure and flow of the medium. Such as throttle valve (expansion valve), oil pressure regulator.

4. Safety type: when the medium pressure exceeds the specified value, it is used to discharge excess medium to ensure the safety of the pipeline system and equipment. Such as a safety valve.

5. Distribution type: change the medium flow direction and distribute the medium. Such as a three-way valve, diverter valve, slide valve.

6. Special uses, such as thimble valves, filters, etc.

Globe Valve

The following is a detailed introduction to the cut-off valve-globe valve:

The globe valve is a downward-closing valve. The opening/closing part (valve disc) is driven by the valve stem and moves up and down along the axis of the valve seat to open and close the valve. The sealing surface is flat or tapered, and the globe valve usually only plays a role of on-off, but because the change of the valve seat port is proportional to the stroke of the valve flap, it can also be used to adjust the flow rate.

Structural characteristics of the globe valve: According to the flow direction of the fluid in the globe valve, the globe valve can be divided into a DC valve and a right angle valve.

(1) DC valve: The valve body and the stem are at 45°, the fluid resistance is small, and the pressure loss is small, which is convenient for maintenance and replacement.

(2) Right-angle valve: The front and back of the valve body are at 90°, and the flow resistance at the elbow is large.

Applicable occasions for globe valves: the application is more general, but the opening and closing torque are large, the structure length is long, and the general nominal diameter will be limited to DN≤200mm.



 
Slika od Yunyin Ding
od Yunyin Ding - ponedeljek, 22. junij 2020, 08:36
vidno vsem

The role of the valve is to control and guide the flow and direction of refrigerant in the system, cut off and conduct the connection between the equipment and the equipment or the equipment and the outside world. Improper operation of the valve can cause unsafe factors or cause accidents, so the operation of the valve must strictly abide by the operating rules to avoid accidents. Cold storage valves mainly include globe valves, expansion valves, and safety valves according to their uses. There are two types of globe valves: straight-through valves and angle valves. The safe operation of the valve should do the following work:

1) The operator must be sure about the operation of the valve and do not accidentally open other valves to cause human accidents.

2) When opening the suction valve of the compressor, the discharge valve of the condenser or the accumulator, it must be carried out slowly, and sometimes it should be started and stopped alternately, so as to avoid the wet stroke accident of the compressor due to too fast opening speed.

3) During the opening of each valve, especially when it is close to the maximum opening, you must slowly pull the handwheel without excessive force, so as to avoid the phenomenon that the valve core is caught by the valve body and the valve is pulled off. When the valve is at the maximum opening (limited to the handwheel can not move), the handwheel should be rotated one or two times.

Cold Storage Valve

4) The operator should pay attention to the proper force during the closing of each valve, and not use too much force, so as not to damage the valve.

5) For pipes and equipment with liquid refrigerant, it is strictly forbidden to close the valves at both ends at the same time, so as to avoid the expansion of the liquid due to the absorption of external heat and the explosion of the pipeline or equipment caused by ammonia leakage. Under normal circumstances, most liquid bursts crack at the valve. The correct way to prevent a liquid explosion is to evacuate the liquid in the tube when closing the valve of the liquid tube. Under special circumstances, when the liquid pipe cannot be evacuated, only the valve at one end of the liquid pipe should be closed, so that the valve connected to the equipment at the other end is in the open state. If the compressor is completely stopped, the supply of the liquid reservoir should be closed first. Liquid valve, wait for the system and liquid pipe to evacuate, then close the main liquid supply valve to the regulating station.

Particular attention should be paid to the parts where liquid explosion may occur in the refrigeration system. These parts are the liquid pipeline between the condenser and the reservoir, the pipeline from the high-pressure reservoir to the expansion valve, the liquid pipeline with shut-off valves at both ends, the liquid level gauge of the high-pressure equipment, and the liquid between the ammonia container Balance pipe, liquid distribution station, the pipeline below the outlet valve of the circulating liquid reservoir to the double suction end of ammonia, the liquid supply pipeline of the ammonia pump, the pipeline from the liquid reservoir to the emergency ammonia drain, and all pipelines that may cause a liquid explosion.

6) Valves that do not open and close for a long time should be regularly checked for opening and closing flexibility.

7) The safety valve in the refrigeration system must be corrected once a year, and the safety valve in question should be repaired or replaced in time.

8) Add the red and yellow opening and closing plates made of color steel plate to the handwheel of the valve to avoid misoperation as much as possible.

The above information is provided by the overflow valve factory.


 
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Slika od Johnny Zhou
od Johnny Zhou - ponedeljek, 22. junij 2020, 08:21
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Pharmaceutical Water Treatment System

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Pharmaceutical Water System

Purified water generator

Distilled water generator

Pure steam generator

CIP & SIP system

Preparation system for chemical pharmacy and traditional Chinese medicine

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https://www.chinacanaan.com/water-series/pharmaceutical-water-system.html


 
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Blizzard is set to deal with the WOW Classic Gold For Sale matter on an ongoing basis, but warns that the change automation software probably isn't going anywhere soon. "Real money trading drives third parties to place an infinite amount of effort into circumventing our detection systems," a Blizzard spokesperson wrote. "As very much like this can be a awfully high priority for us, it's the sole priority for profit-driven botting organizations. The bans we issue are simply a price of doing business for them."

The studio also notes that while its own detection processes are strong and evolving, there's still lots of manual evidence gathering to be done. Indeed, some players especially keen on the World of Warcraft Classic Gold grind might even resemble an automatic account, which makes things trickier.Now that Blizzard has deleted many automatic accounts, we believe that the next World of Warcraft will be more fair. Now many players will buy WOW Classic Gold in the MMOWTS store, the main reason is that the store sells a variety of products, is a legal store, players do not need to worry about the risk of account ban and any transaction risk.

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Slika od Horyn dra
od Horyn dra - ponedeljek, 22. junij 2020, 07:49
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Top 10] Path of Exile Best Builds That Wreck Hard in 2019 | GAMERS ...

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Chúng ta vẫn còn nhớ, ngày xưa khi đất nước còn khó khăn, ông bà ta vẫn hay luộc những củ khoai lang lên để ăn cơm trừ bữa. Những chất dinh dưỡng trong củ khoai lang giúp cơ thể người cân bằng và chúng cũng cung cấp đầy đủ lượng protein cần thiết cho chúng ta.

Xem thêm : XSMN

Khoai lang rất bổ cho sức khoe

Có một điều đặc biệt là khoai lang rất ngon và ngọt, nhưng chất ngọt trong khoai lang là chất ngọt tự nhiên, vì thế nó không làm tăng lượng đường huyết trong máu, giúp cơ thể cân bằng chất dinh dưỡng, và cung cấp những chất xơ cần thiết. Ăn khoai lang vào buổi sáng là một điều rất nên làm, nó có lợi cho sức khỏe và phòng chống được nhiều bệnh ung thư.

Ngày nay, khi con người ta có những cuộc sống đủ đầy, chúng ta ít có cơ hội được nhìn thấy những củ khoai lang ở trên thành thị. Nhưng ở những nơi miền quê nghèo và hoang vắng, người ta vẫn thường xuyên ăn những củ khoai lang thay cơm, như những ngày xưa vậy.

Một số người còn quyết định trồng khoai lang để mang ra thành thị bán, kiếm thêm thu nhập cho gia đình. Đây là một cách kinh doanh rất hay, khi nó đánh vào tiềm thức của mọi người, khiến những ký ức đẹp đẽ của chúng ta trỗi dậy. Ai trong số chúng ta cần đều trải qua một thời kỳ khó khăn như thế, phải ăn khoai lang trừ bữa, những củ khoai, củ sẵn lúc bấy giờ là thức ăn chính của chúng ta.

Với những thế hệ sau này, họ cũng được nghe những ông bà, bố mẹ mình kể về cuộc sống ngày xưa, nên cũng không lạ lẫm gì với khoai lang. Có người tay không ra thành thị, chỉ bán những đồ ăn như khoai lang, cơm nắm muối vừng, thế mà động nghịt cả buổi sáng, thương hiệu khoai lang của người ấy cùng tên góc phố người ấy ngồi trở thành một trong những địa điểm ăn sắng ngon, ấn tượng và rẻ nhất Hà Thành.

Chi tiết : Xổ số miền nam

Mơ thấy khoai lang nói lên bạn luôn sống với quá khứ

Vậy mơ thấy khoai lang trong giấc mơ của mình thì điều đó có ý nghĩa gì? Là điềm báo tốt hay xấu? Chúng ta hãy cùng nhau tìm hiểu sau đây. Mơ thấy khoai lang trong giấc mơ của mình nói lên bạn là một con người hoài cổ, luôn sống với những quá khứ. Có thể quá khứ của bạn có những kỷ niệm mà bạn không thể quên được, hay nói cách khác là không muốn quên.

Bạn không dám đối diện với thực tại, và mãi sống trong những quá khứ không bao giờ có thể trở lại được ấy. Bạn có quá khứ, người khác cũng có quá khứ, và ai trong số chúng ta cũng đều có những quá khứ riêng của mình. Thế nhưng dù quá khứ ấy là gì chúng ta cũng phải để nó ở đấy và hướng đến cuộc sống hiện tại, hướng đến những gì của chúng ta trong tương lai.

Con số liên quan: 96, 69, 15, 51. 

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