Is there any difference between 10K and 20K in valves???

Main parameters of the valve: nominal diameter.

Nominal pressure, working pressure, working temperature The main performance parameters of the valve: nominal diameter, nominal pressure, working pressure and working temperature indicate that the main performance parameters of the valve are nominal diameter, nominal pressure, working pressure and working temperature. 1. Nominal diameter DN is the size of all pipeline accessories in the pipeline system expressed numerically to distinguish those parts represented by threads or outer diameters.

The nominal diameter is a rounded number used as a reference and is not exactly equivalent to the machining dimension. The nominal path is marked by the letter "DN" followed by a number. If the nominal diameter is 250mm, it should be marked as DN250.

2. Nominal pressure Nominal pressure pn is a pressure-related marking code expressed by numbers, which is a convenient round integer for reference. The same nominal diameter indicated by the same nominal pressure pn value! "All tubing accessories have the same connection size as the end connection type.

In China, when it comes to nominal pressure, the unit of measurement is usually given for the sake of clarity.

Represented by "mpa". In the United Kingdom, the United States and other countries, although the concept of nominal pressure has been included in the relevant standards, the imperial unit is still used in practice.

class。Since the temperature benchmarks for nominal pressure and pressure level are different, there is no strict correspondence between the two. The approximate correspondence between the two is shown in the table.

There is a "K" grade system in Japanese standards, such as 10k, 20k, 40k, etc. The concept of this pressure level is the same as that of the pressure level in the imperial unit, but the unit of measurement is in the metric system.

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.

The pressure level is different, which is equivalent to and.

A valve is a device that controls the fluid in a pipeline. Due to the different pressures of the medium in the pipeline when the valve is working, the valve has a maximum working pressure index - nominal pressure, which is marked by pn. For the nominal pressure of pressure pipes, valves, flanges and other pipeline components, countries have formulated a standard series, commonly known as pressure grades.

k is the unit of the Japanese pipeline pressure grade, and 1k is "equivalent" to the national standard pn=.

The pressure levels of different standards cannot be directly converted with the marked pressure values. Because the experimental conditions are different for different standards. For example, most of the experimental conditions of American standard valves are expressed by the withstand pressure value under 420, while most of the experimental conditions of the national standard are expressed with 120.

Therefore, it must be selected according to the corresponding grade comparison table.

If it is a salary, it is between 10,000 and 20,000; Generally speaking, in the composition of wages, K represents thousands, and W represents 10,000.

K is thousand, and 10k-20k means that the salary is 10,000 to 20,000.

Japanese standard flange 10K, 16K, 20K corresponding to PN: 10K=150LB=; 16k=240lb=pn4mpa；20k=300lb=；30k=400lb=；40k=600lb=。

Because the American standard pn=class 150ib is the minimum standard, the equivalent American standard below pn= is pn=class 150ib, so it cannot be directly converted to the American standard. The European system flange represented by Germany and the former Soviet Union, the American system pipe flange standard, represented by ANSI and ANSI B, the British and French pipe flange standards, each country has two sets of pipe flange standards.

When it comes to nominal pressure, the unit of measurement is usually given as "mpa" to ensure clarity. In the United Kingdom, the United States and other countries, although the concept of nominal pressure has been included in the relevant standards, the actual use is still in the imperial unit class. Since the temperature benchmark for the nominal pressure and the pressure level are not the same, there is no strict correspondence between the two.

There is a "K" grade system in Japanese standards, such as 10k, 20k, 40k, etc. The concept of this pressure level is the same as that of the pressure level system in the imperial system, but the unit of measurement is the metric system.

10k = = kg.

16k==kg.

20k = = kg.

I don't know if it's enough, so I'll make a list, please check!

Salary 10k 20k months refers to a salary between 10,000 and 20,000 with a k-tee index value and the number 1000.

Wages can be calculated in different forms such as hourly salary, monthly salary, annual salary, etc. According to Article 4 of the Provisions on the Composition of Total Wages:

Gross salary is made up of the following six components:

1) Hourly wages;

2) piece-rate wages;

c) bonuses; iv) allowances and subsidies;

5) Overtime wages;

6) Wages paid under special circumstances.

That is, the salary is between 10,000 and 20,000;

1. Generally in the composition of wages, K represents thousands, and W represents 10,000;

Second, this salary is relatively high;

That is, the monthly salary is 10,000 to 20,000. Wow, such a high salary.

10k is a k-level unit, and 10 is approximately equal to. 20 is not greater than or equal to 10MPa for pound level, 10k = 150lbs. 20k=300lbs。 40k=600lbs。

100A is the model number, and A basically means angle valve.

CF8 is made of stainless steel, and it is made of 304SS.

1.0k=kilogram and so on.

2.A is the model structure, which is similar to the "open rod", "elastic", "rigid" and "single ram" of the gate valve

3.CF8 is 304 stainless steel.

CF8 is written in the control valve, which means that the valve body is cast, that is, the casting parts are usually represented by CF8 CF3, and the line parts are said

10k=1mpa

20k=2mpa

30=3mpa

40k=4mpa

100A is a caliber 4 inches.

CF8 is material: stainless steel 304

There is a difference. However, in general, it can be used universally.

1. Different types. The A20K model is an exponential, exponential (inverting logarithmic) potentiometer. The B20K is a linear potentiometer. Both potentiometers can achieve the same effect, but the operation is different.

2. The algorithm is different. The algorithm of the A20K type is exponential, and the algorithm of the B20K type is linear, and the two algorithms are very different in terms of calculation, and the exponential algorithm is more troublesome, but the functions that can be achieved are more advanced.

Potentiometers a, b, and c mean:

Type A is an exponential, exponential (inverting logarithmic) potentiometer that varies greatly in resistance when it starts to rotate. The closer the angle is to the end of the maximum resistance, the smaller the change in resistance.

Type B, linear potentiometer: the conductive material on the resistive body is evenly distributed, the resistance value per unit length is roughly equal, and the change of the resistance value is in a linear relationship with the rotation angle of the potentiometer.

Type C is logarithmic, and when the logarithmic potentiometer starts to rotate, the resistance value changes smaller, and the closer the angle of rotation is to the end of the maximum resistance, the resistance value changes greater.

This depends on whether you have high requirements for the amplitude of potentiometer adjustment. If it is used on the power amplifier, it can be universal.

That is, there is an adjustment amplitude when rotating, and we see the potentiometer as an arc, and the potentiometer is placed in parallel. From about 315° it is the left to the end, and to 225° it is the right to the end.

The rotation resistance of type A changes greatly at the beginning, and after half of it, the rotation resistance changes smallly. Type B is uniform, type C changes little at the beginning and then changes greatly. Do you know that way?

It should be understood that the resistance of the 20K type A is 12K to 13K at 90 degrees, and the resistance of the B type is about 10K at 90 degrees. The resistance of Type C is 7 to 8K at 90 degrees.

Look at the numbers to make a difference.

But to the human eye it is negligible.

The PN on the valve is the nominal pressure.

Nominal pressure is a nominal pressure that is artificially specified for the convenience of design, manufacture and use. The unit of this nominal pressure is actually pressure, and pressure is the common name in Chinese, and the unit is "pa" instead of "n".

The nominal pressure is nominal pressure nominal in name or form but not in reality. The nominal pressure of the pressure vessel refers to the nominal pressure of the flange of the pressure vessel. The nominal pressure of the pressure vessel flange is generally divided into 7 grades, that is, 0

40mpa。

The determination of the nominal pressure of the flange is related to the maximum operating pressure of the flange, the operating temperature and the material of the flange. Because when formulating the flange size series and calculating the flange thickness, it is based on the mechanical properties of Q345R at 20.

Therefore, it is stipulated that the flange size determined by this benchmark is considered to be the nominal pressure with the size of the flange at 20.

1. What do the labels "on25" and "pn16" mean? 2. There is an outer hexagon on the valve, so PN16 refers to the valve with a nominal pressure of 16 kg. The fittings on the valve are all standard parts, special.

The pn on the valve refers to the pressure. Generally, the valve is marked with how much dn and how much pn. dn refers to the valve diameter, and its unit is mm; PN stands for Nominal Pressure, and its unit is MPa.

PN nominal pressure, PN is a numerical representation of pressure-related identifiers, which is a convenient round integer for reference, in MPa

DN nominal diameter.

Pressure, pressure (also called pressure level), generally identified as: 0-pn how much, such as: learn from each other!

PN is the nominal pressure, norminal

pressure

In the past, the unit after PN was kg cm2, and PN25 was 25kg cm2, and the new standard stipulates that the unit of PN is MPa. The provisions for PN vary from standard to standard, as follows:

The marking of HG series flanges clearly stipulates that "flange nominal pressure PN, MPa", GB T9124-2000 "Steel Pipe Flange.

The technical conditions clearly stipulate that "the value of pn shall be marked according to the value of bar".

JB T74-94

Technical Conditions" is inexplicable, "the pn value is consistent with the marking example (marked by 10 times the nominal pressure value)", and the "marking example" is not found in the whole standard, and all the nominal pressures are "pn*mpa(bar)".

The above confusion is the root cause of the confusion in the use of "pn" to mark nominal pressure in society, and it is recommended to use a method with units to mark nominal pressure, such as pn**mpa, pn**bar. When selecting the specific meaning of PN, it should be judged according to other information, such as valve, pipeline test pressure, etc.