China Customized Flanges Suppliers

What is Balance valve

The balance valve is an adjusting valve used in fluid pipe network systems. It has precise flow control capabilities and can effectively solve the problem of hydraulic imbalan.

Benefits of Balance valve

Excellent regulation performance: The balance valve adopts a direct-flow valve body structure and an equal percentage flow characteristic design, which can provide a stable flow regulation function at different opening degrees and effectively improve the uneven distribution of hot and cold in the pipeline network.

Precise opening degree display: It has a display of the opening turns accurate to 1/10 turn, allowing operators to intuitively understand the current state of the valve.

Dual - function design: It can be used as a regulating valve and also has the function of a stop valve. There is no need to install an additional stop valve on the pipeline where a balance valve is installed.

Hydraulic balance guarantee: It can reasonably distribute the flow rate according to the proportion calculated in the design, so that each branch can still maintain the set flow rate ratio when the total flow rate changes.

Simple installation and maintenance: It can be installed either on the water supply pipe or the water return pipe. The design of the internal lifting valve stem eliminates the need to reserve an operating space.

Balance valve
Size: DN15-DN300. Working pressure: 10/16/25 bar. Temperature range: -10°C - 80°C.
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Why Choose us

Quality

The quality of a company's products or services is crucial. Look for companies that use high-quality materials and have strict quality control processes.

Expertise

Our team includes qualified and experienced professionals who are experts in their respective fields.

Customer-focused

We prioritize the satisfaction of our clients and make sure their needs are met in a timely and effective manner.

Cutting-edge technology

We constantly update our tools and technology to stay ahead of the competition and provide the best service possible.

High-quality service

We deliver high-quality service, ensuring that our clients receive value for their investment.

Materials Useful To Manufacture Flanges

Carbon Steel

It is steel alloyed usually with carbon. The high strength and hardness increase with carbon content, lower melting point, and ductility. This is the most common material grade.

Alloy Steel

It is steel alloyed with one or more elements that change or enhance the properties of steel. Common alloys include chromium, molybdenum, nickel, vanadium, and manganese.

Stainless Steel

It is steel alloyed with chromium in amounts above 10%. Chromium enables stainless steel to have a much higher corrosion resistance than carbon steel which rusts readily from air and moisture exposure.

Brass

It is an alloy of zinc and copper and often comes with additional elements such as tin or lead. It is characterized by good conductivity, cold ductility, high-temperature ductility, and good strength.

Cast irons

Iron when it is alloyed with silicon, carbon, and several other alloys makes cast iron. Silicon forces carbon out of the iron and forms a black graphite layer on the exterior of the metal. Cast irons have good machinability, castability, and fluidity.

Aluminum

It is a low-density, ductile, and malleable metal with medium strength. It has better corrosion resistance compared to any other typical alloy and carbon steel. It is most useful during flange construction that requires low weight and strength.

PVC

(Note we do not offer polymer grade materials but have written on them for your benefit below)Polyvinyl chloride or PVC is a thermoplastic polymer that is easy to assemble, durable, and inexpensive. It is resistant to both biological and chemical corrosion. The addition of plasticizers makes it more flexible and soft.

What are Various Types of Flanges Used in Piping Applications?

01/

Slip-on flanges

The slip-on flange is a ring (with or without a hub) placed over the pipe’s end. The flange face extends from the end of the pipe by a sufficient distance to apply a welded bead to the inner diameter. As the name suggests, these flanges slip over a pipe and are known as slip-on flanges.

02/

Weld neck flanges

Weld neck flange is also known as a high-neck flange or tapered hub flange. The weld neck flange has a neck that can properly transfer the pipe tension. It also helps to reduce the pressure gathered at the bottom of the flange. It is compatible with pipelines that operate at low or high temperatures and withstand high pressure.

03/

Socket weld flanges

The socket weld flangesare connected on the outside just by a fillet weld. It is often not advisable for critical services. These are useful for the small-bore lines in your system. The static strength is equivalent to slip-on flanges, but the fatigue strength is 50 percent higher than double-welded slip-on flanges. Often used as an alternative to weld necks when space is a constraint.

04/

Blind flanges

He production of blind flanges happens without a bore and is utilized to blank off the ends of pressure vessel openings, valves, and pipes. If you look from the point of view of bolt loading and internal pressure, the most overstressed flange types are blind flanges which are quite bigger.

05/

Lap joint flanges

Lap joint flanges are useful with stub ends when the pipe is made of expensive material. E.g., a carbon steel flange can be added to the stainless steel pipe system as the flanges do not come into contact with the substance in the pipe.

06/

Threaded flanges

Threaded flanges look identical to slip-on flanges, but the key difference is that the threaded flange is bored out to match the inside diameter of the particular pipe. The threaded flange is a type of flange that has taper pipe threads in its bore conforming to ASME B1.20.1 and is helpful in piping systems.

What are Some Common Applications of Pipe Flanges in Piping Systems?

Oil and gas industry

Pipe flanges are commonly used in oil and gas pipelines to connect pipes, valves, and other equipment. They are suitable for use in high-pressure and high-temperature environments and can withstand corrosive fluids.

Power generation industry

Pipe flanges are used in power generation plants to connect pipes, turbines, boilers, and other equipment. They can withstand high temperatures and pressures and are essential for the efficient operation of power generation systems.

HVAC industry

Pipe flanges are used in heating, ventilation, and air conditioning (HVAC) systems to connect pipes, boilers, chillers, and other equipment. They provide a reliable and efficient means of connecting and disconnecting pipes and equipment.

Chemical processing industry

Pipe flanges are widely used in the chemical processing industry to connect pipes, tanks, and other equipment. They are resistant to chemicals and can withstand corrosive substances.

Water and wastewater treatment industry

Pipe flanges are used in water and wastewater treatment plants to connect pipes, pumps, and other equipment. They are resistant to corrosion and can withstand harsh chemicals and sewage.

Plumbing industry

Pipe flanges are used in residential and commercial plumbing systems to connect pipes, fixtures, and other equipment. They are easy to install, maintain, and repair and provide a leak-free connection.

Key things to look out For When Selecting the Right Flanges

Pressure rating

The ability of a flange to resist pressure without any leakages or damages is determined by its pressure rating connected to the maximum working pressure and temperature rating.To ensure optimal functioning, it is imperative to choose a flange with a pressure rating higher than the operating pressure of the pipeline.

Flange material

The selection of material for flange production is essential in determining its sturdiness, longevity, and capacity to resist rust and temperature fluctuations. Flanges may be crafted from diverse materials, including steel, stainless steel, and cast iron. Steel flanges are commonly utilized in the industry, exhibiting toughness and endurance. Correspondingly, stainless steel flanges are well-liked owing to their ability to resist corrosion, making them a good choice for pipelines that transport liquids that have corrosive properties.

Flange dimensions

The dimensions consist of the flange's diameter and flange bolt sizes, including the bolt circle's diameter, the bolt holes' quantity, the bolt's size, and the thickness.The flange's diameter describes the outer diameter of the flange and ought to correspond to the pipe diameter it joins. Additionally, the bolt circle diameter highlights the center of the bolt holes and should correspond with the pipeline's diameter.The number of bolt holes, bolt size, and flange thickness are determined by the pressure rating of the pipe. However, it should be kept in mind that the dimensions of the flange may differ according to the type and standard of the component, such as ANSI, API, and ASME.Therefore, one must consult industry standards to ensure appropriate dimensions are selected for a specific system.
To ensure a suitable fit, it is essential to examine the size and dimensions of your flange. You should pay close attention to how the flange connects with the pipes and gaskets to achieve the optimal size. It is imperative to consider standard dimensional factors.
● Outside diameter
● Inner diameter
● Nominal bore size
● Pipe size
● Bolt circle diameter
● Thickness
These factors of dimension can be helpful when it comes to managing, maintaining, or upgrading pipeline systems.

Classifications

ASME or ASTM standards establish distinct categories for various flanges. Each possesses unique features that affect its performance in diverse industrial settings.There exists a multitude of steel pipe designs and pressure categories. Flanges made of metal receive ratings ranging from 150 to 2500#. In petrochemical industries, several standard classifications are employed.
● 150#
● 300#
● 600#
● 900#
● 1500#
● 2500#
The various classifications differ based on their ability to withstand pressure and heat and their flange design, dimensions, and composition. In general, higher temperatures are associated with lower pressure ratings.

Compatibility of flange fittings with gaskets

Gaskets play a crucial role in creating a secure and impervious joint between the flange surfaces. Nevertheless, the choice of gasket type and configuration may differ based on the specific flange type and material.In situations where the pressure is low, flexible materials such as rubber or PTFE are best suited, while metallic gaskets are better for high-pressure applications.

5 Common Flange Problems and How to Troubleshoot Them

Selecting the wrong size

While this problem is relatively easy to avoid, it's still an issue many companies face on a regular basis. If you select the wrong-sized flange, you might be tempted to try and make it work anyway. This is often a major mistake. You're better off working with high-quality flange distributors to select the right-sized flange.

Wear and tear

High-quality flanges will last for a long time in most situations. That said, like everything else, these components will slowly wear down over time. By keeping a close eye on your flanges, you can replace them before a critical failure occurs. This can save you time and prevent many serious issues.

Stripped and worn bolts

Many flanges rely on bolts to hold them together. These bolts can become worn off or stripped over time. When inspecting your piping, make sure you pay especially close attention to the flange bolts. If there's an issue, you should address it as quickly as feasible. Replacing the bolts is often a fairly straightforward job.

Thermal shocks

Metal will expand and contract as temperatures rise and fall. This will strain flanges, and over time, it can contribute to them breaking down. If your flanges operate in environments with frequently changing temperatures, you may want to inspect them more frequently. If you uncover signs of thermal shock, you should contact a flange distributor to get replacement parts.

Excessive leaks

One of the most common flange issues is leaking. If your flanges are leaking, it could be due to another problem, like thermal shock or general wear and tear. No matter the root cause, it's important to address leaks quickly. If you fail to act, the problem could get much worse. You might be able to patch the leak, but ultimately, you'll want to replace or repair the flange.

Common Flange Maintenance Practices

Visual Inspections

Regularly inspect flange connections for signs of leakage, corrosion, or damage. Check for loose bolts, distorted gaskets, or flange face erosion. Address any abnormalities promptly.

Bolt tightening

Over time, bolts may loosen due to vibration or thermal cycling. Implement a regular bolt tightening schedule using proper torque values. Consider using torque-indicating devices or tensioning methods for accurate bolt preload.

Lubrication And Corrosion Protection

Apply suitable lubricants to bolts and nuts to facilitate proper tightening and prevent seizing. Utilize corrosion protection methods such as coatings or inhibitors to safeguard flanges against corrosion.

Flange Face Cleaning

Keep flange faces clean and free from debris, dirt, or residual gasket material. Use appropriate cleaning methods to avoid damaging the flange surface. Ensure that the flange face is smooth and flat for proper sealing.

Gasket replacement

Gaskets can degrade or fail over time, leading to leaks. Monitor gasket condition and replace as necessary. Choose gaskets compatible with the fluid, temperature, and pressure conditions in your system.

Company Profile

Chengde Rui Mai Trading Co., Ltd. is a professional and competitive supplier of pipes, valves and fittings in China. It is more than 10 years’ experience of helping foreign customers to develop the high quality and suitable valves, strainers, electric actuator and pipe fittings.

Since 2010, we have been successful cooperation with some European companies and Southeast Asian companies for OEM production of wafer butterfly valves and resilient gate valves in China. The fittings with “EH” brand owned by us are so popular in the foreign countries, such as Malaysia, Thailand, Vietnam, Egypt and Russia.

We can offer kinds of selection of the competitive industrial valves, strainers and pipe fittings. We can supervise the quality of the products in each order in the factory as part of your quality control department in China. We also can make investment to develop your special valves or fittings that are popular in local market.

Contact Rui Mai company today and discover the many ways we can help you and your organization with your high-quality valves, fittings, strainers and electric actuators. We believe we are the right one for you.

Asked Questions

Q: What is the allowable gap between flanges?

A: The tolerance is 1.5 millimeter or 1/16 of an inch at any point. Parallelism is the alignment of the flanges so that there are equal distances between the flange faces at all points around the circumference of the joint, therefore making the flange-faces parallel to each other.

Q: What goes in between flanges?

A: Flange faces – refers to the area used for sealing of the flange; a gasket is usually installed between the two opposing flange faces. Examples of flange faces include the flat, raised, ring-type joint (RTJ), lap joint, tongue and groove, and male and female designs.

Q: What are the two main standards of flanges?

A: It comprises flanges with DIN origin and PN/DN designations (DN classification being dependent on PN). Various national standards bodies have incorporated this standard into their respective national standards: DIN EN 1092; BS EN 1092 und NF EN 1092. A further European flange standard is EN 1759.

Q: What is the most commonly used flange?

A: The Weld Neck flange is the most commonly requested flange. It features a neck extension with a tapered hub, a 37.5-degree bevel, and a 1/16” landing at the point of the weld. This will butt directly onto another pipe with a similar level, where it will be welded together with a 75-degree weld.

Q: How do you know if you need a new flange?

A: A broken flange will cause the toilet to move because it is no longer secured to the flange, which is anchored to the subfloor. The constant rocking will likely break the wax seal (located between the toilet and the flange), allowing water to leak onto the substrate and the ceiling below when the toilet is flushed.

Q: What are the OSHA regulations for flanges?

A: The general requirement at 29 CFR 1910.215(c)(1) requires that all abrasive wheels be mounted between flanges which "shall not be less than one-third the diameter of the wheel." At 29 CFR 1910.215(c)(4)(i) the standard requires that "both flanges, of any type, between which a wheel is mounted, shall be the same ...

Q: What can happen if flange is too big?

A: Flanges that are too large may also result in the nipple being pulled all the way in to the end of the flange, which can cause pain. Physical signs that the flanges are too large may also include a full circle ring all the way around on the skin outside of the areola.

Q: What is the design code for flanges?

A: ASME B16. 5 is a construction code for the design of new flanges and related fittings such as reducers, tees and similar. It is one of the related codes referenced in API 570 and API 574 and so forms an important (but not particularly large) part of the API 570 examination syllabus.

Q: How do I know what size flange I need?

A: Measure both breasts as you may need two different sizes. Most moms find that adding 0-3 mm to their nipple size provides the most comfortable and effective flange size.

Q: What are three 3 basic flange face types?

A: There are three common types of flange face, the plain/flat, raised, and ring-type joint (RTJ). Other types of flange face exist, primarily the Tongue-and-Groove (T&G), Lap Joint, and Male-and-Female (M&F) designs, but these are less popular.

Q: What does DIN stand for in flanges?

A: Across the pond, you will find the Deutsches Institute fur Normung (DIN) flange specification, consisting of a variety of European styles which have been unified into one code for the purpose of commonality.

Q: What does B16 mean on a flange?

A: B16 Standards – Valves, Flanges, Fittings, and Gaskets. 4. ASME B16.20. Metallic Gaskets for Pipe Flanges. This Standard covers materials, dimensions, tolerances, and markings for metal ring-joint gaskets, spiral-wound metal gaskets, metal-jacketed gaskets, and grooved metal gaskets with covering layers.

Q: Which tool should be used to separate two flanges?

A: The Zero-Gap Mechanical Flange Spreader range is the ideal tool choice for separating flanges where there is no access gap or very little access gap. Each model within the range, delivers a measurable and controlled force which will separate these flanges quickly and safely.

Q: What is the weakest type of flange?

A: Lap joint flanges have a lap equal to the pipe wall thickness and are among the weakest of the standard types of flanges (true on very large pipes with thin walls).

Q: How do you classify a flange?

A: Pipe flanges are available in multiple types. In fact, they can be classified by facing type, shape, specification and material grade. Within these types, there are standard types (welding neck, slip-on, threaded, socket weld, lap joint, blind, etc.) and some special types (expander/reducer, swivel, orifice, etc.).

Q: What causes flange to fail?

A: Excessive forces and bending moments can loosen the bolting or distort the flanges and lead to leaks. Common causes are inadequate piping flexibility, using cold spring to align flanges, and improper location of supports or restraints.

Q: How do you know if a flange is bad?

A: Conversely, when it's worn down or broken, you'll notice the following: A wobbly toilet bowl. Small pools of water at the toilet base. A bad, lingering odor.

Q: Can you put a new flange over a flange?

A: Can you put a new toilet flange over an old one? A standard toilet flange should fit snugly into the outflow pipe and sit level with the subfloor. Installing a new one without first removing the old one will make it impossible to form a seal and keep the toilet bowl bolted securely in place.

Q: What is the OSHA 300 foot rule?

A: It prohibits employers from using RDS at heights greater than 300 feet above grade unless they demonstrate it is not feasible or creates a greater hazard to use any other system above that height.

Q: What is the ASME Code of flange?

A: 5 Flange and Flanged Fittings Specification. ASME B16. 5 is the most common use standard specification for manufacturing cast and forged steel pipe flange and flanged fittings.

We're professional flanges suppliers in China, specialized in providing high quality products and service. We warmly welcome you to buy customized flanges at low price from our factory. For more cheap products, contact us now.

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