gate valve Archives

Why is austenitic stainless steel magnetic

November 11, 2021

In the procurement case of austenitic stainless steel butterfly valves or gate valves, we can often find an interesting phenomenon. Customers carry magnets with them to check whether the material of the product is genuine. I think it is really “stainless steel” if it can’t be absorbed, and it’s faked with “stainless iron” if it sucks. This is really an “unjust case”. Today this article will share the unscientific aspects of this method.

high performance-double eccentric-butterlfy valve-wafer-lug-flanged (5)

The main reason for the emergence of the magnet inspection method is the recognition of a characteristic of austenitic stainless steel, that is, everyone must know that austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. . Stainless steel is classified according to its organizational structure at room temperature: 1. Austenite type: such as 304, 321, 316, 310, etc.; 2． Martensite or ferrite type: such as 430, 420, 410, etc.; however, everyone ignores the change in ferrite content caused by the difference in forging and casting processes. This kind of magnetism, which is caused by chemical composition fluctuations or different processing conditions caused by smelting, cannot be regarded as counterfeit or substandard. Let’s see why?
1. During smelting, if composition segregation or improper heat treatment, a small amount of martensite or ferrite structure will appear in austenitic stainless steel. In this way, the austenitic stainless steel gate valve will have weak magnetism.
2. After austenitic stainless steel is cold-worked, the structure will also be transformed into magnetic martensite. The greater the degree of cold-working deformation, the more martensite transformation and the greater the magnetic properties of the steel.

marine valve; butterfly valve; check valve; gate valve; manufacturer in China

3. When polishing the product, use an iron wrist to polish it. If it is not cleaned or there are iron filings on the surface, it will show magnetism.
However, the magnetism of austenitic stainless steel caused by the above reasons is not at the same level as that of other stainless steels, such as 430 and carbon steel. That is to say, even if austenitic steel shows a certain degree of weak magnetism, it makes the magnet feel When it comes to suction, it is by no means strong magnetism, and the product itself is still qualified. In other words, if the austenitic stainless steel gate valve is weakly magnetic or non-magnetic at all, it should be judged as 304 or 316 austenitic stainless steel. If the magnetism is the same as that of carbon steel and shows strong magnetism, the product material is not austenitic steel but other materials are used indiscriminately.
If manufacturers want to completely eliminate the magnetic properties of austenitic stainless steel caused by the above reasons, they can restore and stabilize the austenitic structure through high-temperature solution treatment, thereby eliminating the magnetic properties. At the same time, select sand with high silicon content during forging and polishing treatment and then pickling passivation to remove magnetism. At the same time, as a user, when we are purchasing, we also recommend to choose products from reputable manufacturers, not to be greedy for cheap prices and avoid being deceived.

Therefore, it is unscientific to use a magnet to detect whether austenitic stainless steel contains magnetism.

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 to consider when choosing a suitable resilient seated gate valve

November 9, 2021

The soft-seal /resilient seated gate valve is widely used. It is favored by users because it overcomes the product defects such as poor sealing and rust of ordinary gate valves. The soft sealing gate valve has a unique elastic seat seal to achieve a good sealing effect. The soft sealing gate valve is easy to open and close, reliable in sealing, good elastic

DIN-F4-BB-NRS-soft seated-wedge gate valve-DN100-PN16-copper holding ring-handwheel (3)

memory and long service life. It can be widely used as a regulating and intercepting device on the pipelines of tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electric power, shipbuilding, metallurgy, energy system, etc.
To choose a resilient seated gate valve, you must first select the corresponding product according to the use environment, that is, the difference in the medium. Followed by some other technical parameters such as specifications, models and pressures. The correct selection can ensure the performance characteristics of the soft seal gate valve to the extreme, as well as the good operation of the pipeline, extend the service life of the pipeline, pump, and valve, and achieve the expected use effect of production. There are many types of rubber, but the best and economical ones are nitrile rubber and natural rubber. As an elastic sealing pair, they have high elasticity, high tensile strength, good abrasion resistance and drought resistance. Operating temperature range: about -60℃～80 ℃ Non-corrosive or general corrosive medium, can be water, gas, etc.
Soft seal gate valve, the inner cavity surface of the valve is not lined or covered with various rubbers, suitable for various working temperatures and fluid pipelines. Relatively speaking, as a resilient seated gate valve, rubber gate valves are not as resistant to high temperature and corrosion as fluorine-lined gate valves, which is a disadvantage of rubber seals. Fluorine-lined gate valve, also known as fluoroplastic-lined corrosion-resistant valve, is to place PTFE resin on the inner wall of steel or iron valve pressure-bearing parts or the outer surface of valve inner parts by moulding or inlaying, and use it in The unique performance of anti-corrosive medium is made into various valves.
When choosing a resilient seated gate valve, you must fully consider the main issues of medium, temperature, pressure, caliber, etc., to ensure that the use of the valve conforms to the working conditions and the characteristics of the product itself, and to maintain the service life.

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

Reasons and fixing for Leakage of the seat of the metal seated Gate Valve

November 8, 2021

The metal seated gate valve is well used in high temperature and high pressure media, but it also requires high quality due to the particularity of the working conditions, and the sealing problem that makes users most concerned about. What are the main reasons for leakage on the sealing surface? What measures can we take? The sealing

PN40-DN100 cast steel WCB gate valve photo

surface of the gate valve is the core part of the valve. There are four ways of leaking, namely, leakage of the sealing surface, leakage of the joint of the sealing ring, leakage caused by the falling of the closure and leakage of foreign objects embedded between the sealing surfaces. Today we mainly take a look at the leakage causes and solutions of the sealing surface.
1. The sealing surface of the metal sealing gate valve is unevenly ground and cannot form a tight line. Therefore, when the manufacturer grinds the sealing surface, grinding tools, abrasives, emery cloth, sandpaper and other objects should use reasonable grinding methods to be accurate. After grinding, they should be colored and checked. The sealing surface should be free of defects such as indentation, cracks, and scratches.
2. The top center of the connection between the valve stem and the closing part is suspended, incorrect or worn. In production, it is necessary to pay attention to the connection between the valve stem and the closure piece to meet the requirements. The top center should have a certain movable clearance, especially the axial clearance between the valve stem table and the closing part is not less than 2mm.
3. The valve stem is tortuous or the equipment is not right, which makes the closing part tilted or misaligned. If it is because of this situation, it is necessary to straighten and adjust in time to ensure that the valve stem, valve stem nut, closing parts, and valve seat are on a common axis after adjustment.
4. Unscientific selection of raw materials for the sealing surface or unsuitable working conditions of valve selection, resulting in corrosion, erosion and abrasion of the sealing surface. When selecting a valve or replacing the sealing surface, it should meet the working conditions.
5. Surfacing and heat treatment are not operated in accordance with the regulations. The defects such as wear due to low hardness, corrosion due to burning of alloy elements, and cracks due to excessive internal stress will also cause leakage of the sealing surface of the metal sealing gate valve. During the production process of the manufacturer, pay attention to the surfacing welding and heat treatment skills to meet the technical requirements of the compliance procedures and standards. After the sealing surface is processed, the inspection should be carried out to eliminate any shortcomings that affect the use.
6. The sealing surface is not tightly closed or the crevices appearing due to cold shrinkage after sealing, causing a phenomenon of eclipse. For high-temperature valves, some of the slits that show cold shrinkage after being closed should be closed again at a certain time after being closed to be used as a shut-off valve.
7. The metal sealing gate valve has reached the fully enclosed position and continues to exert excessive sealing force, including inaccurate use of long lever operation, and the sealing surface is crushed and squeezed. Therefore, whether it is a metal-sealed gate valve or not, all valves must be opened and closed in accordance with the operating specifications and signs given by the manufacturer. Strictly implement one-person operation or two-person operation according to the size of the valve handwheel, and whether levers within 500mm are allowed.
8. Excessive wear of the sealing surface causes the sealing pair to fail to fit perfectly. To prevent this situation, it should be adjusted in time, and the sealing surface that cannot be adjusted should be replaced.
The quality assurance of the metal seated gate valve is deeply related to the unevenness of the valve manufacturing quality, the quality of the working conditions, the quality of the operation, and the quality of maintenance. Only strict design and production of each link can ensure the safe operation of the valve without problems.

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

Can a gate valve be used for oxygen as the medium?

November 3, 2021

If the soft-sealed gate valve you purchase will be used for oxygen media, the manufacturer will usually advise you not to do so, and inform you that it is prohibited to use gate valves in oxygen media pipelines in the specification. What

Grooved resilient seated BB NRS wedge gate valve (4)

is the reason for this requirement? In fact, this is mainly related to the movement of the gate valve. The opening and closing method of the gate valve is the vertical movement of the gate. The gate and the valve seat will have strong friction and sparks may be generated. Since the contact between the valve plate and the valve seat is not continuous, it is also Static electricity may occur, which is very dangerous when used in flammable and explosive oxygen media pipelines. Let’s analyze it in detail below.

According to the characteristics of the gate valve: the gate valve should not be used to adjust the flow and pressure, otherwise, the sealing surface will wear out quickly and the tightness will decrease.

Moreover, the gate valve cannot be slowly opened for pressure adjustment, so the gate valve is not suitable for oxygen pipelines. One of the reasons why gate valves are forbidden in peroxygen pipelines is that the sealing surface of the gate valve will fall off from the sealing surface due to friction due to relative movement. Although this seems so trivial to us in normal times, in an environment of high-pressure pure oxygen, these small particles of iron powder are very easy to reach the ignition point and burn, and bury potential safety hazards.

Here, there is one more thing to pay attention to, that is, the safety hazards of the oxygen pipeline are not all to blame on the gate valve. When the pressure difference between the two sides of the valve is large, an explosion accident will also occur. Judging from the lessons learned from the accident, banning the gate valve is actually prohibiting the production of combustibles, and the purpose is the same as the regular removal of rust, degreasing, and banning oil. The need to further control the flow rate, do a good job of static grounding and other measures to eliminate the source of ignition, it has a great relationship with the valve material. Although copper-based alloy gate valves are more effective than cast iron and cast steel gate valves in preventing the production of combustibles, this does not mean that there are no hidden safety hazards. The reason is that there is no control of the fire source, and it is impossible to focus on the safety of the gate valve without controlling the source. The attention to operating pressure and the meticulous maintenance of the entire pipeline at all stages must tighten the nerve of safety, not just considering whether a gate valve is used.

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

Is it better to install gate valve or ball valve next to regulating valve?

November 1, 2021

Because both gate valve and ball valve can be used behind the regulating valve, the functions they undertake are basically similar. The two are only different in structure, so users often have questions about whether the gate valve is better or the ball valve is better. This is exactly what this article will discuss today.

DIN-F4-BB-NRS-soft seated-wedge gate valve-DN100-PN16-copper holding ring-handwheel (3)

Before the problem unfolds, we must first make it clear that there is no concept of which product is better for installing a gate valve or a ball valve before and after the regulating valve. Only the more suitable one can be selected according to the actual situation of the user and the working conditions. Let’s first briefly understand the characteristics of gate valves and ball valves.
In terms of function, the gate valve can be installed before and after the regulating valve, mainly used for water supply and hot water pipelines, commonly known as water valves. Generally not used on steam pipelines, because when the steam pressure is high, the gate is difficult to open under pressure, and it is also not suitable for use on pipelines with sediment. The sediment accumulates in the ram seat groove, which will cause the gate to close. strict. The opening and closing part of the gate valve is a gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The ball valve can also be installed before and after the regulating valve. It is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It has the same action of rotating 90 degrees. The difference is that the cock body is a sphere with a circular through hole. Or the channel passes through its axis.
In terms of advantages, the more prominent advantages of gate valves are small resistance, short size, and low price. The relative advantage of ball valves is that they have better fluid control characteristics than gate valves. It only

electric ball valve

needs a 90-degree rotation operation and a small torque to close tightly. Ball valves are most suitable for use as on-off and shut-off valves.

From the above we can see that both gate valve and ball valve can be used before and after the regulating valve. Both of these valves are not suitable for flow control, but the ball valve has better fluid control characteristics than the gate valve, and the sealing performance is also better than that of the gate valve. . However, in actual installation cases, although gate valves and ball valves are installed before and after regulating valves, gate valves are more selected by users. This is why? details as follows:
1. It is troublesome to open and close the ball valve, and it has high requirements on the sealing surface. The sealing of the ball valve has strict requirements on the production and processing technology. If the correct manufacturer is not selected, it is easy to cause the internal leakage of the ball valve if the technology cannot meet the requirements. The cost is therefore relatively high, especially for large-caliber ball valves. The gate valve purchase cost is low, the sealing effect is good, the switch is relatively labor-saving, and when the gate valve is fully opened, it can provide the largest flow passage without causing resistance.
2. If the ball valve is in a static state for a long time, it will jam after a period of use.
3. The requirement of the ball valve for the medium is higher than that of the gate valve. For example, with more fibers and oxygen media, only ball valves can be used.
To sum up, whether it is better to install a gate valve or a ball valve before and after the control valve, we conclude that: Consider the economy, use the gate valve, and the gate valve is much cheaper. Or use gate valves on large-caliber, low-pressure oil, steam, and water pipelines. Considering the tightness, use the ball valve. The ball valve is suitable for working conditions with high requirements for leakage, and is suitable for fast opening and closing, and its quality life is better than that of gate valves.

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

cast steel gate valve vs stainless steel gate valve

October 29, 2021

The statement “cast steel gate valve is a gate valve made of stainless steel” is inaccurate. It is only a one-sided understanding of the two types of valves from the literal meaning. In fact, there are still very big differences between the two. Cast steel gate valves refer to all gate valves made of metal steel materials that are cast into castings. Such

PN40-DN100 cast steel WCB gate valve photo

gate valves are collectively referred to as cast steel gate valves. According to the material, it can also be divided into: carbon steel gate valve, stainless steel gate valve, low alloy steel gate valve (high temperature resistant chromium molybdenum steel belongs to this category), low temperature steel gate valve and so on. Corresponding to cast steel gate valves are also cast iron gate valves, forged steel gate valves, malleable cast iron gate valves.
I believe that at this time we can already see that the cast steel gate valve and the stainless steel gate valve are actually a molding method, that is, a process, and the other is a material type. Cast steel gate valves may be stainless steel gate valves, carbon steel gate valves, alloy steel gate valves. The stainless steel gate valve alone refers to the stainless steel valve, which can be cast or forged. In terms of scope: cast steel ≥ stainless steel valve.

Various cast steel gate valves correspond to different steel grades, which will be engraved on the valve body. The commonly used ones are as follows:
1. The grades of carbon steel gate valve castings are: WCA, WCB, WCC, LCB, etc.; applicable temperature is -46°C~425°C.
2. Stainless steel gate valve casting grades: 301 stainless steel, CF8 stainless steel (corresponding to forging 304 stainless steel), CF8M stainless steel (corresponding to forging 316 stainless steel), etc.; applicable temperature is -198 degrees ~ 816 degrees.

electric stainless steel gate valve

3. Low-alloy steel is divided into high-temperature alloy steel and high-strength low-alloy steel, among which high-temperature alloy steel is often referred to as chromium-molybdenum steel. Casting grades of chromium molybdenum steel gate valve: ZG1Cr5Mo, ZG15Cr1MoV, ZG20CrMoV, WC6, WC9, C12A, etc. The applicable temperature is between 550 degrees and 750 degrees.

The applicable temperature for each specific grade of material is different, depending on the actual working conditions.
Another point worth mentioning here is that cast steel gate valves and forged steel gate valves are often confused because of their similar names, making it unclear how to choose. In fact, the direct way to distinguish is to look at the material grades. For example, 304 stainless steel castings are generally marked as CF3 or CF8, and forgings are generally marked as 06Cr19Ni10 or directly marked as 304. The choice of cast steel gate valve or forged steel gate valve is mainly determined by the working conditions. Forged steel gate valves are mainly used when the medium conditions are special. Because forged steel gate valves are more mature in technology, many domestic manufacturers can do it. It can also be a general reference from the caliber. Generally, forged gate valves below DN40 and cast gate valves above DN40, the pressure will be lower for larger calibers than for smaller calibers. But in the end, of course, we must actively consider the actual requirements of customers, and manufacturers can give some reasonable suggestions.

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

Can cast steel gate valves and 304 stainless steel gate valves be universal?

October 27, 2021

Commonly used cast steel gate valves and 304 stainless steel gate valves are made of steel, and some customers think that stainless steel gate valves are more expensive than cast steel. Can they be universal if they have similar

electric stainless steel gate valve

performance. This is not possible. The two valves cannot be used universally, because the media they are applicable to are still different.
Stainless steel gate valve is more corrosion-resistant and durable! It can still easily hold media with high acid and alkali content, and can be applied to special media. Cast steel gate valves will not work. They are not resistant to acid and alkali. If they are in a medium with high acid and alkali content, they will rust after a while, and they will rust after a while. Cast steel gate valves are more suitable for common media, such as power plants.
Regarding the fact that stainless steel gate valves are more expensive than cast steel gate valves, it also requires specific analysis and cannot be summarized simply. For example, if you use high-density high-quality cast steel gate valves to compare with regular 304 stainless steel gate valves, the cast steel gate valves are more expensive. If it is a lower quality cast steel gate valve compared with a regular 304 stainless steel gate valve, then the stainless steel gate valve is expensive. So we still have to choose according to our own working conditions and make a good budget.

PN40-DN100 cast steel WCB gate valve photo

The types of stainless steel gate valves can be divided into wedge gate valves and parallel gate valves according to the sealing surface configuration. Wedge gate valves can be divided into: single gate, double gate and elastic gate; parallel gate gate valves It can be divided into single gate type and double gate type. Divided according to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve. This type of valve should generally be installed horizontally in the pipeline.
To find a good gate valve product, first of all, a good manufacturer is very important. Tanghai Valve has focused on the production of gate valves for 24 years, with rich experience and good feedback from product users. It is your intimate valve procurement expert. You are welcome to visit the factory!

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

How to choose gate valve products

October 25, 2021

Today, the professional gate valve manufacturer in Tanghai wants to share with you: Which one is better to choose between threaded gate valve and flanged gate valve? Threaded gate valve and flanged gate valve are common

threaded gate valve-inner screw-wedge-EPDM (1)

products in our daily use. Threaded gate valve is also called threaded gate valve. The biggest difference between it and flanged gate valve lies in the connection method. So to figure out whether to choose a threaded gate valve or a flanged gate valve, we only need to be clear about the factors that determine our connection method, so that it is easy to make a choice.
Generally speaking, the pressure and diameter of the pipeline have the greatest influence on the choice of connection. For gate valve products, threaded valves are used for DN80 and below, and flanged valves are used for DN80 and above valves. Sometimes flange connection is combined with threaded connection and welding connection, depending on the specific working conditions.
According to pressure conditions, flange gate valves are generally selected for high-pressure pipelines, and threaded gate valves are used for low pressure. Flange gate valves are stable and reliable when used in pipelines, so flange gate valves are often used in high-pressure pipelines. In summary, when the pressure is small, the pipe diameter is small, use threaded gate valve, and when the pressure is large, the flange gate valve is used when the pipe diameter is large.
Because flanged gate valves need to be welded to the pipeline, sometimes the material of the pipeline needs to be

DN1000-DIN-F5-NRS gate valve-IS&Y (6)

taken into consideration. The flanged gate valve should be selected when the pipe material is suitable for flange welding. If the pipe material is not suitable, other connection methods need to be considered. In addition, there are many kinds of flange materials, so you can listen to the manufacturer’s suggestions according to your own pipeline conditions.
When purchasing gate valves, users should make a simple understanding of the gate valve products and their connection methods from the manufacturer. In this way, when the manufacturer makes a recommendation, the purchaser will have a concept in mind, so as to choose the gate valve product that is more in line with the budget and adapts to the working conditions. Generally, the professional and technical personnel of Tanghai Valve will give detailed explanations to customers to ensure that customers will use and maintain, and are trusted by customers.

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

Excellent environmental protection characteristics of soft sealing gate valve

October 20, 2021

In many working conditions, gate valves are more used to cut off water bodies such as pure water and tap water. Among them, the soft seal gate valve is an updated product of the ordinary gate valve. Generally speaking, as long as one side between the gate and the valve seat is made of soft material instead of metal, it can be called a soft seal. The

AWWA C509-C515-resilient seated wedge gate valve-DN80-150lb (4)

more common one is fluorine or rubber lining. The rubber-lined soft-seal gate valve we mentioned today mainly uses the overall nitrile rubber encapsulation outside the gate, and uses the softness of the rubber to seal the valve to achieve zero leakage in the valve. In addition to the advantages of sealing, the environmental protection characteristics of soft-seal gate valves are also excellent.
The gate plate of the soft-seal gate valve is made of pollution-free rubber material, and the inside and outside of the valve are sprayed with non-toxic epoxy resin electrostatically. This spraying process is advanced and environmentally friendly. It not only makes the appearance of the product smoother and more beautiful, but also does not produce rust water, which can meet the requirements of direct drinking water. Tanghai Valve has invested a huge amount of money to introduce an electrostatic spraying automatic assembly line, which has faster work efficiency. The soft sealing gate valve of Tanghai Valve is also widely used in fluid pipelines such as tap water, sewage, construction, fire fighting, HVAC, metallurgy, energy systems, etc., as a shut-off device. Under the country’s strong environmental protection call, some small factories with unsound qualifications but not enough to shut down have been forced to close under pressure. However, Tanghai Valve has steadily increased its sales due to the green and environmental characteristics of its products.
The soft sealing gate valve produced by Tanghai has extremely low resistance and light switch. At the same time, the “O” type sealing ring is adopted, which is reliable in sealing. The unique design structure enables the “O” type ring to be replaced under pressure, without pressing the packing, and free of maintenance. If you need gate valve products with high environmental performance, you will come to Tanghai Valve. After-sales quality is guaranteed, environmental protection quality is passed.

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 threaded gate valve in application

October 15, 2021

Commonly used pipeline connection methods are mainly: threaded connection, welding and flange connection. The threaded connection we mentioned today is actually also called threaded connection, which is also a connection

threaded gate valve-inner screw-wedge-EPDM (1)

method of gate valve, which connects the gate valve with the pipeline through internal and external threads.
Therefore, we can see that the types of threaded gate valves are divided into external thread type and internal thread type according to the thread position. According to the flow direction of the medium, there are straight-through type, direct-flow type and angle type. When the pipeline of the working condition is small-caliber and low-pressure, the threaded gate valve is generally used instead of the welded gate valve, so that the same cut-off effect can be achieved while saving the budget, and the cost performance is relatively high.
Below, let’s take a look at the specific characteristics of the threaded gate valve in the application?
(1) The flow resistance is small. The internal medium channel of the threaded gate valve is straight, the medium flows in a straight line, and the flow resistance is small.
(2) The threaded gate valve is more labor-saving whether it is opened or closed, because the medium pressure is not large.
(3) Water hammer is not easy to occur because it takes a long time to close.
(4) The threaded connection mode saves cost and is easy to install.
(5) The length of the structure is small, the shape is simple, and the scope of application is wide.
(6) The valve has good rigidity, smooth passage, small flow resistance, reliable sealing, light and flexible operation.
The threaded gate valve can be used for fully open and fully closed functions, and cannot be adjusted or throttled. Suitable for medium oil, water, steam, etc. For more details about the threaded gate valve, please contact our professional team to understand, we will be waiting for your inquiry 24 hours.

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

Why is austenitic stainless steel magnetic

What to consider when choosing a suitable resilient seated gate valve

Reasons and fixing for Leakage of the seat of the metal seated Gate Valve

Can a gate valve be used for oxygen as the medium?

Is it better to install gate valve or ball valve next to regulating valve?

cast steel gate valve vs stainless steel gate valve

Can cast steel gate valves and 304 stainless steel gate valves be universal?

How to choose gate valve products

Excellent environmental protection characteristics of soft sealing gate valve

What are the characteristics of threaded gate valve in application

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