What is the design temperature of the valve made of carbon steel?

The temperature resistance range of carbon steel material is: -29 - 425

If the hard seal is this temperature. If the soft seal (with plastic and rubber sealing rings) seal is: -29 - 250

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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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.

It depends on the steel material used, the valve structure and the working pressure.

Cast steel: It is a general term for iron-based alloys used to produce castings that do not undergo eutectic transformation during the solidification process (the reaction of a liquid of a certain composition crystallizes two solid phases of a certain composition at a certain temperature at the same time). A type of cast alloy.

Cast steel is divided into three categories: cast carbon steel, cast low alloy steel and cast special steel. Cast steel has the characteristics of uniform texture and consistent strength in different directions in material mechanics, which is very suitable for the stressed structure of valves with complex structure and drastic changes in working temperature.

valvesIt is a control component in the fluid transportation system, with the functions of shut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief. Valves for fluid control systems range from the simplest shut-off valves to the most complex valves used in automated control systems.

Cast steel valves: Valves made of cast steel as the main material.

The temperature that a cast steel valve can withstand in working condition is related to the cast steel material used, the valve structure and the working pressure. Generally, cast steel valves: according to the material, there are carbon steel valves, stainless steel valves, low-alloy steel valves (high-temperature resistant chromium-molybdenum steel belongs to this category), low-temperature steel valves, etc.

Under all kinds of cast steel valves, there are various specific steel grades commonly used as follows:

Carbon steel valve casting grades are: WCA, WCB, WCC, LCB, etc.; Applicable temperature: -46 degrees Celsius and 425 degrees Celsius.

Stainless steel valve casting grades: 301 stainless steel, CF8 stainless steel (corresponding to forgings 304 stainless steel), CF8M stainless steel, etc.; Applicable temperature: -198 degrees Celsius and 816 degrees Celsius.

Low-alloy steel is divided into high-temperature alloy steel and high-strength low-alloy steel, of which high-temperature alloy steel is often referred to as chromium-molybdenum steel.

Casting grades of chromium-molybdenum steel valves: ZG1CR5MO, ZG15CR1MOV, ZG20CRMOV, WC6, WC9, C12A, etc. The applicable temperature is 550 degrees Celsius and 750 degrees Celsius.

The applicable temperature of each specific grade material is different, depending on the actual operating conditions.

The operating temperature of the valve is intrinsically related to the pressureand influence each other. The valve of a certain pressure is only suitable for a certain temperature range, and the change of valve temperature can affect the operating pressure of the valve.

For example, the nominal pressure of a carbon steel valve is 10MPa, and when the medium working temperature is 200, its maximum working pressure is 10MPa: when the medium working temperature is 400, its maximum working pressure is:

When the working temperature of the medium is 450 °C, its maximum working pressure is.

The following is an excerpt from the People's Republic of China Machinery Industry Standard JB T 3595-2002 "General Requirements for Power Station Valves". It can be seen that under the same nominal pressure, the maximum allowable pressure of valves of different materials at different temperatures.

This needs to look at the performance of the seal material used in the valve.

If the ball valve PTFE is sealed, it is more than 100 degrees safer.

Gate valves can be used to more than 400 degrees.

Specifically, you need to ask the manufacturer who sells the valve.

The operating temperature of the valve is determined by the material from which the valve is manufactured. The common materials used in the valve are used at the following temperatures:

When rubber and plastic are used for <> valve lining, the temperature resistance of rubber and plastic shall prevail. Ceramic valves, because of their poor temperature resistance and abrupt denaturation, are generally used for working conditions below 150. Recently, there has been a super-performance ceramic valve that can withstand temperatures up to 1000 °C.

Glass valves have poor temperature resistance and abrupt denaturation, and are generally used in working conditions below 90. The temperature resistance of the enamel valve is limited by the sealing ring material, and the maximum operating temperature does not exceed 150 °C.

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.

1. Gray cast iron: Gray cast iron is suitable for water, steam, air, gas and oil with a nominal pressure of pn and a temperature of 10 200. The commonly used grades of gray cast iron are: HT200, HT250, HT300, HT350.

2. Malleable cast iron: suitable for water, steam, air and oil medium with nominal pressure pn and temperature of 30 300, commonly used grades are: KTH300-06, KTH330-08, KTH350-10.

3. Ductile iron: suitable for PN, water, steam, air and oil at a temperature of 30 350. Commonly used grades are: QT400-15, QT450-10, QT500-7.

In view of the current domestic technology level, the factories are uneven, and it is often not easy for users to inspect. As a rule of thumb, it is recommended that the valve is still made of steel for safety.

For example, the commonly used cast iron butterfly valve: the x rubber sealing surface is generally within 80 degrees, and the fluoroplastic sealing surface is within 150 degrees. These are common!

The high temperature resistant cast iron butterfly valve can withstand high temperatures up to four or five.

The theoretical temperature of the cast iron valve is less than 425 degrees, but the operating temperature of the valve is mainly determined by the sealing surface material, which is the short board effect, and the operating temperature of the least temperature-resistant parts is the operating temperature of the entire valve

The operating temperature of ordinary cast iron valves is not more than 50 room temperatures;

The application temperature of WCB weldable cast carbon steel is -29 425 ;

Ductile iron is the same as WCB.

The valve material has a temperature and pressure corresponding curve, generally speaking, the higher the temperature, the lower the pressure it bears, which is an inverted curve.

The temperature of the cast iron valve is within 120 200 degrees.

Personal opinion, theoretically yes.

1. In fact, for high-pressure and high-temperature valves, under the premise that the pressure strength can be satisfied, the high-temperature should be aimed at the material.

First of all, make sure that it can withstand the design temperature, because the design temperature is actually the extreme value of the temperature.

2. It is recommended that you can consider sampling the valve to do a hot test, and it will be practical.

3. In fact, in addition to the temperature resistance of the material, if there is a sealing surface, it is necessary to focus on whether it can be exposed without deformation in the hot state, and if not, the cemented carbide can be butt welded on the surface of the sealing surface.

Carbon steel valve is a general term for carbon steel, and its material grades are: 20, 25, 30, 35, and other types of steel, rather than ductile iron.

There are carbon steel, and there are also ball milled cast iron, but generally the valve does not use cast iron, which is easy to rust.

WCB is cast carbon steel, and WCB's forging is A105. Writing on the valve indicates the body material.

WCB is an American grade, equivalent to the domestic ZG250-485 (ZG45), and its chemical composition: C; si≤; mn≤; p≤; s≤; cr≤; mo≤;v≤;ni≤;cu≤

Suitable for temperature range -29 to 425 .

For details, please refer to.

Threaded end valves with rated temperature not more than 540 and nominal pressure not more than PN420;

The flange connection end valve with nominal pressure PN16 PN25 is rated at a temperature of no more than 540.