Showing Slide 1 of 6: Anti Corrosion Check Valve for Harsh Industrial Media

Anti Corrosion Check Valve for Chemical Fluid Systems

Anti Corrosion Check Valve for Water Treatment Plants

Anti Corrosion Check Valve for Industrial Equipment

Anti Corrosion Check Valve for Chemical Fluid Handling

Anti Corrosion Check Valve for Reliable Flow Protection

WL4906 Anti Corrosion Check Valve for Chemical Equipment

Anti Corrosion Check Valve is one way valve that can be used to avoid reverse fluid flow in harsh industrial applications. The valve provides automatic flow control with corrosion resistant construction that can handle aggressive fluids, chemicals, wastewater and other types of media. The valve can be made of stainless steel, engineered plastics, PTFE, fluoropolymer lining or any other corrosion resistant material depending upon the application. The automatic opening and closing feature helps to protect the pumps, pipelines, tanks and process equipment against backflow and pressure fluctuations. Anti corrosion check valves are widely used in chemical processing, water treatment, wastewater treatment, semiconductor fabrication, electroplating, pharmaceutical processing and industrial fluid handling applications. The proper selection requires an evaluation of compatibility with the fluid, pressure, temperature, flow rate, type of connection, cracking pressure and installation conditions. A properly selected valve can reduce leakage, corrosion damage, maintenance needs and unexpected process shutdowns in industrial fluid systems.

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Anti Corrosion Check Valve Description

What is Anti Corrosion Check Valve? Anti corrosion check valve is a special automatic one way valve that can control the fluid flow and protect itself from corrosive media. The valve allows the fluid to pass through the valve and automatically closes when there is the flow reversal or change in the differential pressure. The construction materials of the valve are either selected or protected to give higher chemical resistance in comparison with conventional valves. The construction material may be stainless steel, reinforced plastics, PTFE, fluoropolymer lining or any other material that can resist corrosion depending upon operating conditions. The valves are extensively used in chemical processing, wastewater treatment, water treatment, electroplating, semiconductor, pharmaceutical and industrial piping systems. They are mainly used to protect equipment and pipelines from backflow. How Does an Anti Corrosion Check Valve Work? The functioning of an anti corrosion check valve is based on the pressure difference at the inlet and outlet of the valve. If the pressure on the inlet side of the valve is higher than that on the outlet side by the amount of the required cracking pressure, then the disk, ball, piston or poppet is lifted off its seating surfaces. It gives an opportunity for the medium to flow through the valve downstream. If the difference in pressure is reduced or if the pressure on the outlet side is higher than the pressure on the inlet side, the closing element moves back toward the seat. The valve automatically closes and stops the reverse flow. In some designs the spring helps in closing the valve and swing designs rely on fluid force and gravity. The way of functioning may depend upon the design of the valve. To protect the valve from corrosive media, the materials that are exposed to the medium were selected for this purpose. The proper selection of materials reduces chemical corrosion, leakage, swelling, cracking and premature degradation of components.

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Anti Corrosion Check Valve Technical

Brand	Weilong	Model Number	WL 4906
Rated Voltage (V)	DC12V or 24V	Rated Power (W)	3W
Work Mode	Air or Liquid Control Valve	Working Pressure (MPa)	400KPa
Air-Flow Rate	0 L/minute	Reset Time(s)	1 S On, 1 S Off
Service Life	200 Thousand Times	Certification	CE, ROHS, ISO9001,
Pipe Gate	inside: 4 mm	Lead Wire Length(mm)	75 MM
Install Style	Screw	Tolerance of Dimension	± 0.1 MM
Water-proof	None	Insulation Class	B
Hi-Pot Test	AC 600V 50/60 Hz 2s	Non-excitation Holding Force	0
Working Temperature	-10°C-100°C	Duty Cycle	1-100%
Thread Depth (mm)	/	Payment Term	TT, or LC At Sight
Sample Order	Yes	Warranty	1 Year
MOQ	1000 pcs	Supply Ability	5000 pcs per week
Delivery Time	30 Days	Port of Loading	Shenzhen

Why Is the Anti Corrosion Check Valve So Popular?

Anti corrosion check valves are used more and more often as the majority of industrial processes utilize chemicals, treated water, wastewater, acids, alkalis, solvents and other aggressive media. The corrosion of the conventional valve materials may be possible in such cases of continuous contact with such media.

A corrosion-resistant check valve does two things: provides protection against the backflow and resists the process media. This combination can help to protect the pumps, pipelines, storage tanks, heat exchangers and other equipment.

Another reason for their increasing popularity is the availability of different material combinations. Engineers can choose metals, engineered plastics, PTFE, fluoropolymer-lined constructions and sealing materials depending on the application.

The advantage of automatic operation is that there is no need for the external actuator or control signal. If the valve is selected properly, the valve will react to the pressure differentials in the pipeline.

The complexity of industrial fluid systems has increased the necessity for dependable components that can work continuously with little intervention. Therefore, well-selected anti corrosion check valves can contribute to system reliability, equipment protection and reduced maintenance.

Anti Corrosion Check Valve Applications

Anti corrosion check valves are used in industrial systems requiring protection from the backflow and where the process medium may attack conventional valve materials.

Chemical Process

Corrosion resistant check valves are installed in pipelines of chemical plants conveying acids, alkalis, solvents and other aggressive chemicals. The valve operation depends on the material compatibility.

Water Treatment

In water treatment equipment, check valves are used to control the direction of flow between pumps, filtration equipment, storage tanks and treatment stages.

Treated Wastewater

Wastewater can contain suspended solids and contaminants and corrosive chemicals. The check valves can help to protect pumps and pipelines from backflow.

Electroplating.

Electroplating systems use chemically aggressive solutions. Chemical circulation systems require corrosion resistant materials to extend the service life of the valve.

Semiconductor Fabrication

Specialized fluid systems may require a high level of purity and chemical compatibility of valve materials. The choice of the correct material is especially important in case of contamination control.

Pharmaceutical Processing

Corrosion resistant check valves can be used in pharmaceutical fluid systems where chemical compatibility, cleanability and controlled flow direction are important.

Industrial Chemical Storage

The check valves can be used in the chemical tanks and transfer systems to reduce the risk of undesired backflow.

General Industrial Pipeline

They can be used to protect pumps, compressors, processing equipment and circulation systems when the corrosive media are conveyed through industrial pipelines.

Anti Corrosion Check Valve Adv. & Disadv

Advantages and Disadvantages

Pros

Corrosion resistance:

Special materials and protective linings increase the resistance to aggressive chemicals and corrosive fluids.

Automatic operation:

The valve operates normally on differential pressure and does not require the external actuator.

Reverse flow protection:

The valve prevents the back flow which can damage pumps, contaminate process lines or interfere with the system operation.

Material flexibility:

The process media of different kind require different body, lining, seat and sealing materials.

Compact designs:

There are many designs of check valves that are compact in size and can be installed in industrial pipelines.

Lower control requirements:

The operation is automatic so no additional electrical or pneumatic control equipment is required.

Disadvantages

Materials compatibility has to be carefully checked:

There is no single material resistant to all chemicals under all conditions.

Pressure drop:

Some check valve designs may have the pressure drop, especially at higher flow rates.

Possible water hammer:

Rapid closing may result in pressure surges in some pipeline systems.

Maintenance Needs:

Seats, springs, disks and seals can eventually wear out or become damaged.

Contamination sensitivity:

The proper sealing and closing can be obstructed by particles or deposits.

Higher first time cost:

Special corrosion resistant materials and linings may be more expensive than normal valve construction.

Troubleshooting of Anti Corrosion Check Valve

If an anti corrosion check valve does not operate properly, check system pressure, flow direction, the installation of the valve, and process conditions.

The Valve Doesn’t Open

Verify that the inlet pressure is sufficient to overcome the cracking pressure of the valve. A too stiff spring, too much dirt or wrong installation can prevent opening. Be sure that the flow direction corresponds to the arrow on the valve body.

The flow is reversed

Inspect the valve seat, disk, ball, piston or sealing surfaces for damage or deposits. The sealing components can be swollen, cracked or deformed due to chemical attack. Check the material compatibility with the process medium.

Too Much Pressure Drop

Check the valve for being undersized/partially blocked. Compare the actual flow rate to the operating range indicated by the manufacturer. Deposits or damaged internal parts may also obstruct the flow path.

The Leak

Check the sealing surfaces and gaskets. Tighten the external connections if necessary, but do not over-tighten. If the seal is damaged by chemical exposure, replace it with a compatible material.

Valve Cranks Up the Volume

Vibration or noise may be caused by unstable flow, high velocity, rapid closing or cavitation. Verify system pressures and flow conditions and assess if water hammer is present.

Frequent failures

Check all operating parameters such as chemical concentration, temperature, pressure, flow rate, installation orientation and material compatibility. Frequent failures may indicate that the valve design or the materials are not suitable for the real application.

FAQ

1. What is anti corrosion check valve?

Anti corrosion check valve is a one-way valve that prevents the reversal of fluid flow and protects from corrosion caused by aggressive chemicals and industrial media. It is widely used in chemical processing, waste water treatment, water treatment, and industrial piping systems.

2. How does an anti-corrosion check valve work?

The valve opens when the upstream pressure is sufficient to lift the internal closure mechanism from its seat. When the flow changes direction, or if the downstream pressure increases, the internal closure mechanism automatically falls on the seat preventing reverse flow.

3. What materials are used in anti corrosion check valves.

Common materials used in the manufacture include stainless steel, plastic engineered materials, PTFE, fluoropolymer coatings and corrosion resistant liners. The proper choice of material will depend on the composition, concentration, temperature and flow rate of the process fluid.

4. Where are Anti-corrosion valves used?

Commonly used in chemical industries, waste water treatment facilities, water treatment installations, electroplating machines, semiconductors manufacturing processes, pharmaceutical manufacturing and industrial chemical transfer piping.

5. How to choose an anti-corrosion check valve?

Take into account the medium, its chemical compatibility, temperature, pressure, flow rate, pipe diameter, connection type, cracking pressure and installation position. Parameters must be set to those provided by the manufacturer.

6. Can an anti-corrosion check valve be used for acids and alkalis?

In some cases the valves can be manufactured from chemically compatible materials to selected acids and alkalis. But the chemical resistance is determined by the chemical compound, its concentration, temperature and exposure period. Verify the material compatibility before mounting the valve.

7. Why does my corrosion-proof check valve leak?

Causes may include damage to the valve seat, worn out seals, contamination, improper installation, excessive back pressure or chemical degradation of the sealing mechanism. Check internal parts and ensure that the materials of the valve are chemically compatible with the process medium.

8. How do I service an anti corrosion check valve?

Check regularly for leaks, corrosion, vibrations, unusual noises and pressure loss. Always maintain a clean pipeline and perform regular inspections of seals and internal parts.

How to Select an Anti Corrosion Check Valve

Selecting the right anti corrosion check valve is more than just selecting a corrosion resistant material. The valve should be suitable for all the operating conditions of the fluid system.

1. Identify the medium

At first, understand precisely what the valve is to handle. It should be noted that the chemical name, concentration, pH, contaminants, viscosity and whether the medium is liquid, gas or multiphase mixture. The material compatibility should be checked for real operating conditions.

2. Temperature test

Identify the minimum, normal and maximum operating temperatures. The seal materials, plastics, linings and elastomers may have different temperature limitations.

3. Pressure test

Identify the normal operating pressure, maximum working pressure, pressure spikes and back pressure. Select the valve with suitable pressure rating and safety margin.

4. Calculating the flow requirements

Consider normal and maximum flow rates. An undersized valve results in too much pressure loss and an oversized valve results in poor operating characteristics. Find out the flow coefficient and pressure drop data if available.

5. Choose the design of the valve

Spring-loaded, swing, lift, ball and wafer check valves operate in a different way. The installation position, flow direction, closing speed, pressure drop and possibility of water-hammer should be considered.

6. Pick compatible materials

The materials which come in contact with the fluid are of particular importance. Depending upon the fluid, the options are PTFE or fluoropolymer, engineered plastics, stainless steel or lined construction. Check the chemical compatibility with the valve manufacturer.

7. Connection requirements

Consider the size of the pipeline and type of connection, for example threaded, socket, wafer or flanged connections. Please identify the dimensions before ordering.

8. Maintenance

Choose the valve design that allows practical inspection, cleaning, seal replacement or component replacement if needed.

Finally, compare all operating parameters with the technical documentation from the manufacturer. A properly selected anti corrosion check valve should protect the process from backflow without the pressure loss and material compatibility issues.

Anti Corrosion Check Valve Design Tips To Avoid Common Mistakes

There are several common design mistakes that can shorten the service life and reliability of an anti corrosion check valve.

1. Choosing materials only on price

The low-cost material may not be able to withstand the actual temperature or chemical concentration. Always check the chemical compatibility first.

2. Ignoring the process temperature

The material may be resistant to a chemical at ambient temperatures but may act differently at elevated temperatures. Always check the whole temperature range.