Is there a 60Mpa breathing valve, and is the safety valve a single breathing valve?

Here are some of the well-known brands recognized in the 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.

In this case, we don't have the pressure to do this.

1. Tight-set breathing valve.

Lock-type breathing valves are usually used for low-pressure through-pipe pipes, and the sealing performance depends entirely on the fit between the plug and the plug body, and the compression of the sealing surface is achieved by tightening the nut at the bottom. Generally used for PN.

2. Packed breathing valve.

The stuffed breathing valve is made by pressing the packing material to achieve the sealing of the plug and the plug body. Due to the packing, the sealing performance is better. Usually this type of breathing valve has a packed gland, and the plug does not have to protrude from the valve body, thus reducing a leakage path for the working medium.

This breathing dry valve is used in large quantities for pressures of PN 1MPa.

3. Self-sealing breathing valve.

The self-sealing breathing valve is a compression seal between the plug and the plug body by the pressure of the medium itself. The small head of the plug extends upwards out of the body, and the medium enters the big head of the plug through the small hole at the inlet, and the plug is pressed upward, which is generally used for air medium.

4. Oil-sealed breathing valve.

Nowadays, the range of applications for breathing valves is expanding, and oil-sealed breathing valves with forced lubrication have appeared. Due to forced lubrication, an oil film is formed between the sealing surface of the plug and the plug body. In this way, the sealing performance is better, the opening and closing are labor-saving, and the sealing surface is prevented from being damaged.

The first is to exhale or inhale when a certain pressure is reached; The other is designed to be purely exhale-only and non-inhale, which can be understood as replacing it with two check valves of appropriate pressure.

The second type of breathing valve is similar to a one-way check valve, it can only exhale the pants cover outward, can not inhale in, when the pressure in the system rises, the gas will be vented through the breathing valve to ensure that the pressure of the system is constant. For the storage tank where toxic substances are stored, there is no breathing valve, and treatment devices such as activated carbon filters can be added.

Breathing valves are generally used in atmospheric or low-pressure storage tanks, that is, only atmospheric pressure and low-pressure storage tanks have breathing emissions (there is often a steam ** system on low-pressure tanks), and high-pressure storage tanks have no emissions, no respiratory loss and no loss of work.

The main emissions from fixed top tanks are divided into respiratory loss (small respiratory emissions) and work loss (large respiratory emissions).

Is there a vent on the top of the inner floating roof tank, and is there a breathing valve?

Actually, it can be understood in this way.

Breathing valves are divided into single call valves, single suction valves and breathing valves.

We generally think that the setting pressure is greater than one atmosphere) when the safety valve is used, and the pressure is less than the breathing valve.

It is generally considered that a single suction valve is a safety valve used for low pressure working conditions.

Personal recommendation: breathing valves. Here's why:

1. The breathing valve is a safety facility used on the top of the atmospheric storage tank, which can keep the pressure in the atmospheric storage tank always in a normal state, which is used to reduce the evaporation loss of volatile liquids in the atmospheric storage tank and protect the storage tank from overpressure or vacuum.

If the pressure on your site is really not large, and the design pressure is below (greater than that is regarded as a pressure storage tank), you can use a breathing valve, but when using a breathing valve, the design pressure is generally below the majority;

2. Although there is a nitrogen supply valve, considering the double protection, the suction function of the breathing valve is still indispensable, so that when there is a problem with the nitrogen sealing, some air or special gas can be temporarily inhaled to keep the pressure balance of the horizontal tank. However, it should be noted that when the breathing valve is used on the nitrogen-sealed tank, the pipe position of the nitrogen gas supply pipe must be far away from the breathing valve interface, and inserted into the storage tank by the top of the tank more than 200mm, so that the nitrogen will not be directly removed after entering the tank, so as to achieve the purpose of blanketing.

The oil is volatile, and it is necessary to design a breathing valve to relieve pressure to ensure that there is no crappy pressure in the tank; The volatilized oil and gas are flammable and explosive, and all need to be equipped with safety valves to vent when overpressure and liquid level are exceeded.

Generally speaking, the safety valve we say should be higher than the pressure, that is, higher than one atmosphere.

It belongs to the ultra-low pressure safety valve, if you don't want to use the single suction valve in the breathing valve instead, then find some large manufacturers, if other working conditions are not so harsh, you can do this kind of safety valve.

If it is not harsh, the conventional spring-loaded safety valve can be satisfied, and if the working conditions are harsh, the low-pressure pilot-operated safety valve can also be satisfied.

If it is a negative pressure tank, it is not possible, because it is a standard atmospheric pressure, and the atmospheric pressure on the plateau is less than, even if the tank is vacuumed, the pressure difference between the pressure in the tank and the outside atmosphere will not be reached, that is, the negative pressure tank will not have this pressure difference on the plateau. From the point of view of on-site use, this breathing valve is problematic, your purpose is to open the breathing valve when the difference between the tank pressure and the outside atmospheric pressure reaches it, but because this pressure difference can never be reached, the valve will never be opened.

But if it is a positive pressure tank, then it can be used, the internal pressure of the tank is higher than the external pressure, the breathing valve is open, this is no problem at all, the pressure difference on the plateau and the pressure difference on the plain is the same, that is to say, no matter in the **, it is.

In addition, if the operating pressure difference of the breathing valve is relatively small, such as only a few hundred pascals (as long as this pressure difference is less than the atmospheric pressure of the external environment), then whether it is a negative pressure tank or a positive pressure tank, it can be used in the plain and on the plateau, and it should be noted that it may be the influence of temperature.

It is not equal to, the atmospheric pressure of the plateau is low, and the difference between the internal and external pressure should be greater than that of the plateau.