supplier Archives

Medium temperature for butterfly valves of different materials

September 30, 2021

In the large number of butterfly valve enquiries made by Tanghai Valve every day, “medium temperature” is a frequently mentioned term. Because the different types of media have a great influence on the selection of valve varieties. Whether the medium is an ordinary liquid, a highly corrosive special medium, or a cement-like turbid

Double flange butterfly valve (7)

medium, all correspond to different valve types. Whether the medium is high temperature or low temperature also determines which material of the butterfly valve is more suitable and durable. Now let’s take a look at the medium temperature of various butterfly valve materials.
The main material involved here is the body and bonnet material of the butterfly valve. The corresponding medium temperature is as follows:
Cast iron-the highest temperature of the applicable medium is 300℃;
Nodular cast iron-the highest temperature of the applicable medium is 350℃;
Stainless steel ——The highest temperature of applicable medium is 600℃;
Polytetrafluoroethylene——Maximum operating temperature of applicable medium: -180~150℃;
Rubber —— The highest operating temperature of the applicable medium: natural rubber 60℃; nitrile rubber and neoprene rubber 80℃; fluorine rubber 150℃. When the valve lining is made of rubber or plastic, its temperature resistance shall prevail.
Gray cast iron-the highest temperature of the applicable medium is 250℃;
High silicon cast iron-the highest temperature of the applicable medium is 120℃;
Carbon steel-the highest temperature of the applicable medium is 425℃ (if 16Mn, 30Mn forgings can reach 450℃);
Alloy steel-the highest temperature of the applicable medium is 550℃;
Copper alloy-the highest temperature of the applicable medium is 200℃;
Titanium-the highest temperature of the applicable medium is 300℃;
In addition, there are relatively special ceramic and glass butterfly valves, which have poor temperature resistance and are generally used below 90°C. The temperature resistance of the enamel valve is limited by the material of the sealing ring, and the maximum medium temperature exceeds 150℃.
Among the above various butterfly valve materials, cast iron butterfly valves, spheroidal ink butterfly valves, stainless steel butterfly valves, PTFE butterfly valves, and rubber butterfly valves are widely used and have better overall performance. They also occupy a large number of daily orders for Tanghai valves. The proportion of products is very popular in the market. Tanghai Valve produces butterfly valve products of various specifications and materials. With 24 years of industry experience, I believe you will definitely choose your favorite high-quality butterfly valve here.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

What are the connection methods of gate valves for hydropower stations

September 29, 2021

Gate valves used in hydropower stations are often in a relatively special working environment, which also puts forward high requirements on the quality of the gate valves. Among them, the connection method it uses is also an important process composition. What we are going to share today is about the connection method of gate valves for hydropower stations.

DIN-F5-BB-NRS-soft seated-wedge gate valve (10)

The most common connection method used in gate valves of hydropower stations is mainly flange connection. This connection method is usually two flange pieces plus a number of fastening bolts and nuts, and the pipes are connected by pressing the middle flange gasket. Why do you think that flange connection is the most suitable method for gate valves in hydropower stations? This is mainly because the flange connection can withstand high-strength tensile, compression, torsion and shear resistance. The flange connection is a detachable joint, which has the advantages of convenient disassembly, high connection strength, and good tightness.
According to the shape of the joint surface, the flange connection can be divided into: smooth type, used for gate valves with low pressure; concave-convex type; tongue and groove type: widely used in corrosive media, with better sealing effect; trapezoidal groove type: Use an oval metal ring as a washer, which is used for gate valves with a working pressure of ≥64 kg/cm², or high-temperature gate valves; lens type: the washer is in the shape of a lens and is made of metal. Used for high-pressure gate valves or high-temperature gate valves with working pressure ≥100 kg/cm²; O-ring type: This is a newer form of flange connection, which is developed with the appearance of various rubber O-rings As a result, it is more reliable than ordinary flat gaskets in terms of sealing effect. In addition to flange connection, there is also threaded connection or ferrule connection, which is a simple connection method that can reliably prevent leakage and so on.
After a brief introduction, do you have your own ideas for the selection of gate valves for hydropower stations? If you need a gate valve for a hydropower station, please first consider Tanghai Valve. The gate valve produced by Tanghai Valve is mainly used in normal temperature and pressure environment, professional and high-quality, and professional technicians will give reasonable suggestions according to your working conditions, so that you can easily choose the right one. Of valve products, you are welcome to contact us at any time.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Correct installation of flanged butterfly valve can effectively prevent leakage

September 28, 2021

Butterfly valve has the advantages of good flow adjustment function and good closing and sealing characteristics, so it has become one of the fastest-growing valve varieties in the past ten years. It has simple and compact structure, light weight, convenient operation, reliable performance, complete functions, beautiful appearance, easy

Double flange butterfly valve (16)

maintenance, and is very popular with customers. In actual working conditions, if you want the flanged butterfly valve to achieve effective leakage prevention, the correct installation method is very important. Today, the editor of Tanghai Valve will share with you the installation precautions of the flange butterfly valve, as follows:
1. Before installation, you must carefully check whether the valve’s logo and certificate meet the requirements for use, such as Tanghai D342X flange rubber-sealed butterfly valve, to see whether the product brand, model, etc. are consistent with the valve required for the pipeline, and clean it after verification. Here is also the storage problem of flanged butterfly valves: the butterfly valves that have not been installed and used for the time being must be stored in a dry room; the butterfly valves that have been stored for a long time should be cleaned regularly, blown dry, and coated with anti-rust oil. The flange sealing surface should be protected by a blind plate.
2. Install according to the medium and its flow direction. For example, if you use water, you need to use ethylene-propylene rubber gaskets. When tightening the bolts, use the symmetrical or star-shaped torque method; if you use corrosive media, use PTFE gaskets. When tightening the bolts, use Torque on symmetrical or star-shaped method;
3. When installing the connecting bolts of the flange butterfly valve and the pipeline, do not tighten a single piece at one time, and should tighten it in diagonally opposite directions multiple times to prevent the uneven force from leaking at the flange connection.
4. When installing the butterfly valve, keep the butterfly plate in the closed position to prevent debris from entering the worn sealing surface. When the user is testing pressure, the pressure can be tested only after the two ends are installed with flange pairs.
5. When the valve is connected to the pipeline, flanges of appropriate specifications should be selected to ensure an effective sealing surface.
6. Before the electric flange butterfly valve is connected to the power supply for the first time, it needs to be manually adjusted to 1/3 of the closed position, and check whether the direction of the indicator plate is consistent with the opening direction of the valve.
7. When the flange butterfly valve is in use, if any malfunction is found, it should be stopped immediately.
Master the above correct installation method, flange butterfly valve will be more confidential and durable in application. If you are in need of purchasing high-quality flanged butterfly valves, Tanghai will be your best choice. The sealing surface of Tanghai flange butterfly valve has high processing precision, small opening friction and easy closing. Not only the self-sealing performance and the sealing performance are stable, but it also has the characteristics of self-locking that becomes tighter and tighter. It is suitable for gas, steam, air, water and other media. You are welcome to inquire.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

The difference between knife gate valve and ordinary gate valve

September 27, 2021

There are many types of gate valves. Knife gate valve is one of them, also called knife gate valve. According to different structure types, gate valves can be divided into flat gate valves and knife gate valves. According to the different connection methods, knife gate valves can be divided into flange type; lug type and wafer type.

DIN-F5-BB-NRS-soft seated-wedge gate valve (10)

Compared with ordinary gate valves, the structure of the knife gate valve is simple, the opening and closing part is a gate, and the movement direction of the gate is perpendicular to the direction of the fluid. It is small in size, flexible in operation, and easy to install. It is more suitable for media with higher consistency and solid particles. As we can see from the name, the knife gate valve mainly relies on the knife-edge gate to cut off the medium. The gate has two sealing surfaces, forming a wedge shape. The gate can be made into an integral rigid gate; it can also be made into an elastic gate that can produce slight deformation and improve the sealing performance from the process. To sum up, compared with ordinary gate valves, knife gate valves mainly highlight the following product advantages:

1. The U-shaped gasket has a good sealing effect.
2. The full-diameter design makes the medium passability strong. At the same time, it can be easily installed, easily disassembled, and maintained under the working conditions of dirty media. The valve seal can be replaced without removing the valve, making the valve maintenance easier.
3. The gate with the function of the guillotine knife has good sluicing effect, can effectively squeeze off all kinds of debris in the medium, and solve the leakage phenomenon of the medium containing lumps, particles and fibers after the sluice is broken.
4. The knife gate valve has an ultra-short structure length, small size, small flow resistance, light weight, material saving, and small effective space.
Although the price of knife gate valve is about 20% higher than that of ordinary gate valve, its better performance has been generally recognized by the market, and it has quietly boarded the list of the most popular product series of Tanghai Valve. Through more than 20 years of research and production of valve technology, Tanghai Valve has senior production experience and advanced technical level, has a formal and modern production base, and has stably provided a large number of products for the knife gate valve market with a good reputation. If you need a knife gate valve, choose Tanghai Valve.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Introduction to the applicable occasions of butterfly valve

September 24, 2021

Butterfly valve is one of the most commonly used valves in piping systems. It has a wide range of applications. It can not only be used to cut off the flowing medium in the pipeline, but also can be used for flow adjustment. When the

Fluorine lined butterfly valve-PTFE-WAFER (10)

fluid in the pipeline passes through the butterfly valve, the pressure loss is about 3 times that of the gate valve, and the pressure loss is relatively large. Therefore, two factors should be considered when choosing a butterfly valve. One is the pressure loss experienced by the piping system, and the other is the pressure of the pipeline medium and the working temperature that the elastic valve seat material can withstand when the butterfly valve is closed.
The structural length of the butterfly valve is short, the overall height is also small, the operating torque is short, it can be opened and closed quickly, and fluid control can be performed well. The structural principle of the butterfly valve makes it most suitable for making large-diameter valves. When the butterfly valve is required to be used for flow control, in order to make it work more effectively, it is necessary to select the correct size and type of the butterfly valve.

What occasions are butterfly valves suitable for?

Double eccentric-wafer butterfly valve-D372F-150lbP-stainless steel (1)

1. It is required to be used for throttling and regulating control in the pipeline, and the valve structure is required to be short in length and fast in opening and closing. It is recommended to use a butterfly valve.
2. On pipelines that require two-position adjustment and necking, low noise is required, cavitation is generated, a small amount of leakage into the atmosphere, and the circulating medium is corrosive, a butterfly valve can be selected.
3. Under special working conditions where there are strict requirements for sealing, low temperature containing impurities, and easy to cause wear, it is recommended to use butterfly valves, and to use metal-sealed triple-eccentric or double-eccentric butterfly valves.
4. In petroleum, petrochemical, chemical, metallurgical, electric power and other fields, it is recommended to use metal hard-seal triple-eccentric butterfly valves. In many cases, they can replace gate valves and globe valves.
5. The center line butterfly valve is suitable for the environment with strict requirements on sealing performance and zero leakage. The center line butterfly valve is most suitable for fresh water, sewage, sea water, salt water, steam, natural gas, oil and oil at a working temperature of -10-150℃. Used in pipelines of various acid and alkali media.

triple offset butterfly valve-double flange- (5)

6. The double eccentric butterfly valve is very suitable for use in urban heating, gas, water and gas pipelines, as a device for intercepting or adjusting flow.
7. Eccentric soft sealing butterfly valves are widely used in gas pipelines and waterways in metallurgy, light industry, electric power and petrochemical systems. Used as a two-way opening, closing and adjustment of the ventilation and dust removal pipeline.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Introduction to the applicable occasions of butterfly valve

September 23, 2021

Butterfly valve is one of the most commonly used valves in piping systems. It has a wide range of applications. It can not only be used to cut off the flowing medium in the pipeline, but also can be used for flow adjustment. When the fluid in the pipeline passes through the butterfly valve, the pressure loss is about 3 times that of the gate valve, and the pressure loss is relatively large. Therefore, two factors should be considered when choosing a butterfly valve. One is the pressure loss experienced by the piping system, and the other is the pressure of the pipeline medium and the working temperature that the elastic valve seat material can withstand when the butterfly valve is closed.

U-type flange butterfly valve, ductile iron, DI, center line,

The structural length of the butterfly valve is short, the overall height is also small, the operating torque is short, it can be opened and closed quickly, and fluid control can be performed well. The structural principle of the butterfly valve makes it most suitable for making large-diameter valves. When the butterfly valve is required to be used for flow control, in order to make it work more effectively, it is necessary to select the correct size and type of the butterfly valve.

What occasions are butterfly valves suitable for?
1. It is required to be used for throttling and regulating control in the pipeline, and the valve structure is required to be short in length and fast in opening and closing. It is recommended to use a butterfly valve.
2. On pipelines that require two-position adjustment and necking, low noise is required, cavitation is generated, a small amount of leakage into the atmosphere, and the circulating medium is corrosive, a butterfly valve can be selected.
3. Under special working conditions where there are strict requirements for sealing, low temperature containing impurities, and easy to cause wear, it is recommended to use butterfly valves, and to use metal-sealed triple-eccentric or double-eccentric butterfly valves.
4. In the fields of petroleum, petrochemical, chemical, metallurgy, electric power, etc., it is recommended to use metal hard seal triple eccentric butterfly valve. In many cases, it can replace gate valve and stop valve.
5. The center line butterfly valve is suitable for the environment with strict requirements on sealing performance and zero leakage. The center line butterfly valve is most suitable for fresh water, sewage, sea water, salt water, steam, natural gas, oil and oil at a working temperature of -10-150℃. Used in pipelines of various acid and alkali media.
6. The double eccentric butterfly valve is very suitable for use in urban heating, gas, water and gas pipelines, as a device for intercepting or adjusting flow.
7. Eccentric soft sealing butterfly valves are widely used in gas pipelines and waterways in metallurgy, light industry, electric power and petrochemical systems. Used as a two-way opening, closing and adjustment of the ventilation and dust removal pipeline.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

What are the characteristics of the hard seal butterfly valve

September 22, 2021

Hard seal butterfly valve is a kind of butterfly valve with eccentric metal seal structure, and it is usually required to be installed horizontally in the pipeline. The sealing form of the metal hard seal butterfly valve is usually a metal-to-metal seal, and the sealing pair is composed of a metal hard material to a metal hard material. Hard-sealed butterfly valves can be driven by turbine manual, electric, pneumatic and so on.

triple offset butterfly valve-double flange- (5)

Nowadays, hard-sealed butterfly valves have been widely used in many fields such as petroleum, chemical industry, metallurgy, power generation, etc., to cut off or control the circulating medium in the pipeline system. At this stage, there is a relatively advanced hard-sealed butterfly valve, which is a triple-eccentric metal seated butterfly valve. Its body and seat are a conjoined component. On the sealing surface layer of the valve seat, a temperature-resistant and corrosion-resistant alloy material is surfacing welded. , And fix the multi-layer soft stacked sealing ring on the valve plate. The novel design allows the triple eccentric butterfly valve to overcome the shortcomings of poor sealing performance. The advantages of the triple eccentric butterfly valve are high temperature resistance, low friction when opening and closing, and when closed, the butterfly plate compensates for the seal along with the increase of the torque of the transmission mechanism, which greatly improves the sealing performance of the hard seal butterfly valve and prolongs the service life of the valve.

The advantages of the triple eccentric hard seal butterfly valve are:
1. The unique three-eccentric design enables frictionless transmission between the butterfly plate and the sealing surface of the valve body, reducing wear and extending the service life.
2. It can adapt well to low temperature, normal temperature and high temperature environment.
3. Pneumatic and electric devices can be configured according to the needs of users to meet the needs of remote control and program control.

The shortcomings of the triple eccentric hard seal butterfly valve are:
1. The butterfly plate of the hard sealing butterfly valve is fixed by multiple layers of soft and hard stacked sealing rings. When the butterfly plate is in the normally open state, the flowing medium will flush the sealing surface positively, which will affect the sealing performance of the valve over time.
2. Because the overall structure of the hard-sealed butterfly valve’s butterfly plate is too thick and the flow resistance is relatively large, the valve is not suitable for diameters below DN200.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

What are the characteristics of the soft sealing butterfly valve

September 18, 2021

Risilient seated /Soft sealing butterfly valve is one of the common butterfly valve types. It is a valve with simple structure and easy operation. It is mainly composed of valve body, valve stem, butterfly plate and sealing ring. The inside of the valve body is a cylindrical shape with a built-in butterfly plate. There are usually two ways to form the seal of a soft-seal butterfly valve. One is that the sealing pair is composed of a non-metallic soft material to a non-metallic soft material. Another is that the sealing pair is composed of a metal hard material to a non-metal soft

wafer type butterfly valve, EPDM seat (10)

material.
The most commonly used materials for the seat ring and seat of soft-sealed butterfly valves are EPDM, nitrile rubber, and polytetrafluoroethylene plastic. The soft-sealed butterfly valve with EPDM rubber seat material usually works in a working environment with a pressure less than 2.5Mpa and a temperature of -50~80℃. Applicable media include salts, acids, metal coating solutions, and water. , Wet chlorine, etc. The soft-sealed butterfly valve with nitrile rubber as the seat material usually works in a working environment with a pressure less than 2.5Mpa and a temperature of -10~90℃. The applicable media include water, oil, waste liquid, etc. The soft-sealed butterfly valve with polytetrafluoroethylene as the seat material can be used in an environment where the pressure is less than or equal to 1.6Mpa and the temperature is -196~200℃. The applicable media include heat resistance, cold resistance, general chemicals and solvents, and most of the liquid.
The advantage of the soft sealing butterfly valve is that it has good sealing performance and can achieve zero leakage. The disadvantage is that it is not resistant to high temperature and high pressure, and the sealing surface is easily eroded by the flowing medium, and the service life is short. The characteristics of the soft sealing butterfly valve are as follows:
1. The valve body is small and light, easy to install, disassemble and repair, and can be installed at any position in the pipeline.
2. The whole valve has a simple structure and is very compact, with small operating torque, and can be opened and closed by rotating 90 degrees.
3. It has good flow regulation performance.
4. The seal can be replaced, the sealing performance is good, and the two-way sealing can be achieved.
5. The butterfly plate can be sprayed with a coating layer, such as nylon rubber or polytetrafluoroethylene, according to the needs of users.
6. Flange connection and wafer connection can be designed according to requirements.
7. According to the requirements of the working conditions, the soft-sealed butterfly valve can be driven manually, electrically or pneumatically.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

The difference between fluorine-lined butterfly valve and metal butterfly valve

September 17, 2021

Butterfly valve is one of the most commonly used valves in industrial pipelines. It has a simple structure and is mainly composed of a valve body, a valve stem, a butterfly plate and a sealing ring. It is easy to operate and can be equipped with different driving devices, such as turbine devices, electric devices, and pneumatics. Equipment, etc., to adapt to more working conditions. Compared with other valves of the same caliber, the overall cost of butterfly valves can be reduced by 1.5 to 2 times, which is economical and practical. Therefore, butterfly valves are most suitable for large-diameter valves and are often used in occasions with larger calibers and flow rates.

Fluorine lined butterfly valve-PTFE-WAFER (8)

According to the sealing form of the butterfly valve, we can divide the butterfly valve into two categories: soft sealing butterfly valve and hard sealing butterfly valve. The two butterfly valves with different sealing forms play different roles in the corresponding application pipelines, and it can even be said that there are big differences. Therefore, users should understand the difference between the two types of butterfly valves when choosing butterfly valves, and choose butterfly valve products reasonably and correctly according to their own operating conditions.
Among soft seal butterfly valves and hard seal butterfly valves, our most common and commonly used ones are soft seal fluorine lined butterfly valves and metal seated butterfly valves. The difference between fluorine lined butterfly valves and metal seal butterfly valves is that fluorine lined butterfly valves are generally used for flowing media containing corrosion. In the flexible pipeline, the sealing effect is excellent, and zero leakage can be achieved. However, due to its own material limitation, this type of butterfly valve is only suitable for use in normal temperature and pressure

triple offset butterfly valve-double flange- (4)

conditions. The metal-sealed butterfly valve can be used in working conditions with relatively high temperature and pressure, and it also has certain anti-corrosion performance, but its sealing performance is poor. Specifically, the difference between fluorine-lined butterfly valve and metal sealing butterfly valve is as follows:
1. The difference in structure:
Both sides of the metal seal butterfly valve seal pair are made of metal materials. As for the fluorine-lined butterfly valve of soft sealing butterfly valve, the butterfly plate and valve seat are both wrapped with PTFE;
2. The difference in sealing performance:
The sealing material of fluorine-lined butterfly valve is tetrafluoroplastic, which has excellent sealing performance, but it is prone to aging, abrasion and short service life. The sealing performance of the metal sealing butterfly valve is relatively poor, but it is corrosion-resistant, wear-resistant and has a long service life.
3. The difference in applicable working conditions:
The fluorine-lined butterfly valve has strong corrosion resistance and can be used in corrosive media pipelines. It is only suitable for normal temperature and pressure environments. The metal sealing butterfly valve has poor sealing performance and is generally used in high temperature and high pressure environments.
4. The difference in manufacturing process:
In terms of working principle, the difference between fluorine-lined butterfly valve and metal-sealed butterfly valve is not big. The difference in manufacturing process between the two is mainly in the valve seat. The seat material of the fluorine-lined butterfly valve is non-metallic PTFE and metal-sealed butterfly valve. The valve seat is made of metal materials, and the commonly used materials are copper alloy, chromium stainless steel, stellite alloy, nickel-based alloy and so on.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Features of Stainless Steel Valves

September 15, 2021

Generally speaking, stainless steel valves are valves made of stainless steel. They are classified according to the stainless steel material grade of the valve body. They are mainly 301, 304, 316, 304L, 316L, etc. According to international standards, they can be divided into CF8, CF3, CF8M, CF3M, the quality of the material

D673H-16C-stainless steel pneumatic triple eccentric butterfly valve

CF8<CF3<CF8M<CF3M. Because stainless steel has strong corrosion resistance, is easy to form, has high compatibility, and can remain strong in a wide temperature range, many advantages make stainless steel valves widely used in heavy industry, light industry, daily necessities industry and architectural decoration industry. middle.
Stainless steel refers to steel that is resistant to corrosion by weak corrosive media such as air, steam, water and chemical corrosive media such as acids, alkalis, and salts. It is also called stainless acid-resistant steel. Stainless steel valves are also stainless acid-resistant steel valves. , And resistant to acid and alkali corrosion. Research tests have shown that the corrosion resistance of steel in weak media such as the atmosphere and water and oxidizing media such as nitric acid will increase with the increase of the chromium water content in the steel. When the chromium content reaches a certain percentage, the corrosion resistance of steel The sex changes, that is, from easy to rust to not easy to rust, from no corrosion resistance to corrosion resistance.
Common stainless steel valves mainly include stainless steel butterfly valves and stainless steel ball valves. The gate valve is rarely made of stainless steel, because the gate valve is usually used for low corrosive media such as water.
Stainless steel butterfly valve, also known as stainless steel flap valve, usually adopts three-eccentric metal hard sealing structure. The valve body, valve seat and butterfly plate sealing surface are all made of stainless steel with different hardness, which has strong corrosion resistance and long service life. It is widely used in metallurgical, electric power, petrochemical, water supply and drainage, municipal construction and other industrial pipelines with fluid pipeline medium temperature ≤ 425°C.
Stainless steel ball valves usually require horizontal installation in the pipeline. Stainless steel ball valves can be divided into stainless steel pneumatic ball valves, stainless steel electric ball valves, and stainless steel manual ball valves according to the driving mode. According to different stainless steel materials, it is divided into 304, 316, 321 stainless steel ball valves. The stainless steel ball valve switch is light and can also be made into a large diameter. It has reliable sealing, simple structure and convenient maintenance. The sealing surface and spherical surface are often in a closed state and are not easily eroded by the medium. It has applications in various industries.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Posts

Medium temperature for butterfly valves of different materials

What are the connection methods of gate valves for hydropower stations

Correct installation of flanged butterfly valve can effectively prevent leakage

The difference between knife gate valve and ordinary gate valve

Introduction to the applicable occasions of butterfly valve

Introduction to the applicable occasions of butterfly valve

What are the characteristics of the hard seal butterfly valve

What are the characteristics of the soft sealing butterfly valve

The difference between fluorine-lined butterfly valve and metal butterfly valve

Features of Stainless Steel Valves

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