Valve model compilation standard example, valve body code, gray cast iron body, why is it omitted

The most commonly used and most basic are often omitted. For valves with pressure classes below the lowest level, grey cast iron is the most commonly used and most basic.

When the pressure level is reached, the body code gray cast iron body cannot be omitted.

For details, see: "JB T308-2004 Valve Model Preparation Method":

The body material code of gray cast iron valves with nominal pressure less than or equal to is omitted in the preparation of the model.

The body material code of carbon steel valves with nominal pressure greater than or equal to is omitted in the preparation of the model.

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.

There are 14 types of valve type designations, including:

1. Code Z: gate valve; 2. Code J: globe valve; 3. Code L:

Throttle; 4. Code Q: ball valve; 5. Code D: disc valve; 6. Code H:

check valves and foot valves; 7. Code G: diaphragm valve; 8. Code A: safety valve; 9. Code T:

regulating valves; 10. Code X: plug valve; 11. Code Y: pressure reducing valve; 12. Code S:

traps; 13. Code DZ: solenoid valve; 14. Code O: solenoid actuator.

Valve model and indication method

1.The first unit indicates the type of valve.

For example, Z represents the gate valve, D represents the butterfly valve, and H represents the check valve.

Wait; 2.The second unit represents the transmission mode.

For example, 9 means electric, 6 means pneumatic, 3 means worm gear drive, etc.;

3.The third unit represents the form of connection.

Such as 6 means welding, 4 means flange, 7 means clamping, etc.;

4.The fourth unit represents the structural form.

For example, the 1 of the butterfly valve represents the central vertical plate structure, and the 1 of the gate valve represents the single valve plate open rod structure, etc.;

5.The fifth unit indicates the code of the sealing surface and lining material.

For example, y represents cemented carbide.

X for rubber, h for stainless steel, etc.;

6.The sixth unit represents the nominal pressure.

Numeric value. With Arabic numerals.

Directly speaking, this value is 10 times the value in MPA units. Such as 10 means that the nominal pressure is;

7.The seventh unit represents the valve body material.

For example, Z represents gray iron, Q represents ductile iron, C represents carbon steel, P represents stainless steel, etc.

Valve Material Code:

A: Safety valve; d: butterfly valve; g：

diaphragm valves; h: check valve (foot valve); j: globe valve; l：

Throttle; p: blowdown valve; Q: Ball valve; s：

traps; u: Plunger valve; x: plug valve; y：

Relief valve; z: gate valve.

The valve model should usually indicate the valve type, drive mode, connection form, structural characteristics, sealing surface material, valve body material and nominal pressure and other factors. The standardization of valve models provides convenience for the design, selection and sales of valves. Nowadays, there are more and more types and materials of valves, and the type preparation of valves is becoming more and more complex.

Valve Material Code:

The classification of valves is mainly divided according to their use and structural characteristics. However, generally we use the general classification method, that is, according to the principle, function and structure, which is currently the most common classification method at home and abroad. Here we according to the material of the valve body, the valve can be divided into:

1) Metal material valve: its valve body and other parts are made of metal materials. Such as cast iron valves, carbon steel valves, alloy steel valves, copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves, Monel alloy valves, etc.

2) Non-metallic material valve: its valve body and other parts are made of non-metallic materials. Such as plastic valves, ceramic valves, boring valves, FRP valves, etc.

3) Metal valve body lining valve: The shape of the valve body is metal, and the main surface in contact with the medium inside is lining, such as rubber lining valve, plastic lining valve, ceramic lining valve, etc.

The main body materials are: C carbon steel, I 1Cr5Mo chromium-molybdenum steel, H Cr13 series stainless steel, K malleable cast iron, L aluminum alloy, P 0Cr18Ni9 series stainless steel, PL 00Cr19Ni10 series stainless steel, Q ductile iron, R 0Cr12Ni12Mo2 series stainless steel, RL 00Cr17Ni14Mo2 series stainless steel, S plastic, T copper and copper alloy, Ti titanium and titanium alloy, V Cr-molybdenum vanadium steel, Z gray cast iron.

The following are the material parameters and specific applications of several stainless steel valves:

There is a new standard for the preparation method of valve models, you can refer to JB T 308-2004 "Valve Model Preparation Methods".

The type and model of the valveFor example: Z961Y-100i DN150.

The first unit represents the type of valve, such as Z for gate valve, A for safety valve, D for butterfly valve.

The second unit represents the transmission mode, such as 9 means electric, 6 means pneumatic, 7 means hydraulic.

The third unit represents the connection form, such as 6 represents welding, 4 represents flange.

The fourth unit, representing the structural form, such as 1 represents a single ram.

The fifth unit represents the code of the sealing surface and lining material, such as Y for cemented carbide and X for rubber.

The sixth unit, which represents the nominal pressure value, is directly expressed in Arabic numerals, which is 10 times the value in the MPA unit. For example, 100 means that the nominal pressure is 10MPa.

The seventh unit represents the valve body material, such as i represents chromium-molybdenum steel.

The parts and components of the valve must go through the following process before assembly

1. According to the processing requirements, some parts need to be polished, and there can be no processing burrs on the surface.

2. All parts are degreased.

3. After the degreasing is completed, pickling passivation is carried out, and the cleaning agent does not contain phosphorus.

4. After pickling and purification, rinse with pure water, there can be no residue of chemicals, and carbon steel parts omit this step.

5. Wipe and dry each part with non-woven fabric, and do not retain the surface of the parts such as wire wool, or blow dry with clean nitrogen.

6. Wipe each part with non-woven fabric or precision filter paper dipped in pure alcohol until there is no dirty color.