How do you clean hydraulic valves?

Note the following when we do the cleaning Filth of the Hydraulic Valve:

1. For filth that has a long deposition time and is firmly stuck, do not scratch and damage the surface when cleaning.

2. Pay attention to safety when heating. Some inorganic cleaning solution is toxic, heating and volatilization can intoxicate people. It should be used with caution. The organic cleaning solution is flammable. Pay attention to the risk of catching fire.

3. Pay attention to the corrosiveness of the cleaning solution when choosing it, in order to avoid corrosion on the sanitary valve body.

4. After cleaning, pay attention to the storage of parts to avoid corrosion and being polluted again.

5. Assembled hydraulic valve needs to be tested before it can be put into use.

Common Cleaning Techniques of Hydraulic Valve Include:

1. Disassembly

Although various parts of the hydraulic valve are connected using bolts, the design of the hydraulic valve is not intended for disassembly. If there is no specialized equipment or professional technology, forced disassembly is highly likely to cause damage to the hydraulic valve. Therefore, we need to grasp the structure of the hydraulic valve and the connection type between parts before disassembly. When disassembling, record the position relationships between various parts.

2. Check and clean-up

Check the filth deposition situation of the valve body, valve core, and other parts. Without damaging the work surface, clean the filth using cotton yarn, brush, and non-metallic scraper.

3. Rough wash

Put valve body, valve core, and other parts on the tray of the cleaning tank. Through heated soaking, press the compressed air into the bottom of the cleaning tank. Through the stirring effect of the bubble, clean the residual filth. If conditions permit, ultrasonic cleaning can be used.

4. Fine wash

Use the cleaning solution to do high-pressure positioning cleaning and dry with the hot wind in the end. If conditions permit, companies can use existing cleaning solutions. On individual occasions, organic cleaning solutions such as diesel and gasoline can be used.

5. Assembly

Assemble according to the hydraulic valve assembly diagram or the parts assembling relationships recorded during disassembly. Be careful not to damage parts during assembly. The original sealing material is easily damaged during disassembly and should be replaced during assembly.

Conclusion

Because of the different techniques and equipment maintenance of different enterprises, service quality will vary considerably. Maintenance of equipment and technology for the lack of business, even after servicing the hydraulic system restored to its original state, should strengthen surveillance, and actively purchase spare parts, in response to an unexpected failure.

Thank you for reading our article and we hope it can help you better understand the proper ways to clean the filth of hydraulic valves. If you want to learn more about hydraulic valves, we would like to advise you to visit Adamant Valve homepage for more information.

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Here, Adamantvalves will introduce the maintenance of sanitary butterfly valves.

1. During the application of the sanitary butterfly valve, it should always be kept clean. The driving thread must be lubricated regularly. When the fault is found, it should be stopped immediately to find out the reason to clear the fault.

2. Packing gland bolts should be evenly tightened, which should not be pressed into a crooked state, so as not to hinder the stem movement or cause leakage.

3. When it is installed, the valve can be connected directly to the pipeline. Under normal circumstances, it can be installed anywhere in the pipeline, but the position is best to facilitate the operation of the overhaul. Note that the flow of stop-valve media should be vertical flap up flow, and the lifting check valve can only be installed horizontally.

4. When using the butterfly valve, only a fully open or fully closed state is permitted. It does not allow to adjust the flow, so as to avoid the erosion of the sealing surface and accelerate the wear and tear. The gate valve and thread shut-off valve have the inverted seal device. Handwheel screwed to the top position can prevent media from leakage at the packing.

5. Handwheel should be used when opening and closing the butterfly valve. Do not use levers or other tools, so as not to damage the valve. Handwheel rotates clockwise to close, and opposite direction to open.

Butterfly valve: A butterfly valve is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The “butterfly” is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

Conclusion

Thank you for reading our article and we hope it can help you better understand sanitary butterfly valve maintenance. If you want to learn more about sanitary butterfly valve maintenance, we would like to advise you to visit Adamant Valve homepage for more information.

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If your sanitary valves are likely to be exposed to high temperatures, the rubber material selection is possibly going to be a critical factor as it can prolong or cut short the lifespan of your valve.

Here are a few tips on rubber material selection:

• • For food industry applications, temperatures close to 150 degrees F may render most rubber plastic seals unusable. However, you can find great choices for food industry applications that can operate up to 200 degrees F or beyond. Such seals can still accept steam cleaning (open end) and not steam pressure. Most of the rubber materials available in the market can operate above 200 degrees F. Examples are Silicone (4500 F), Buna (2300 F), EPDM (3000 F), Teflon (4500 F), and Viton (4000 F).

• • Sanitary silicone rubber seals can withstand high temperatures in addition to steam sterilization though it’s not recommended that you use them for perpetual steam service.

• • Teflon rubber seals have excellent thermal qualities. This material can withstand steam sterilization and continuous steam at low pressure. When selecting a Teflon rubber valve assembly, be careful to ensure that it has suitable external construction that can stand those thermal conditions that your valve will be exposed to.

For instance, do not go for rubber seals with a lot of filler material around the cover for those applications that call for intermittent steam. This is because contraction and expansion of the rubber liner may loosen the end connections.

Other factors to consider for rubber seals operating under higher temperature applications

• • Most sanitary valves manufacturers usually reduce the working pressure range on their products as the temperature rises. Ensure you consider this when specifying the rubber seal for your valve.

• • If the valve will be connected to a piping system that’s subject to numerous steam cycles, its cool own cycle will possibly see a large amount of vacuum. Therefore ensure that the rubber seal you choose has the vacuum pressure rating in addition to the working pressure.

How to Select the Right Rubber Seal?

When selecting the rubber seals for your sanitary ball valves or any other type of valves, ensure that you consider the thermal range of their intended use. This will give you a hint of the temperature range of the rubber seal to use. Other than the temperature range, also consider the working pressure because it usually determines the working temperature.

How long your rubber seal will last depends on the frequency of use, thermal conditions, the material it’s made of, and several other factors. Be sure to ask your supplier any questions before you buy a rubber seal.

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Hearing damage is gradual and irreversible. It starts with a loss for high frequencies, with a continued hearing loss, it will eventually lead to a loss for low frequencies as well, which affects the ability to listen to normal languages. When subject to low-frequency noises, the functions of human organs such as the heart or liver may also be affected. In addition, noise and its associated vibrations can also affect the performance of the valve and lead to fatigue in sanitary valve pipelines and adjacent equipment.

In essence, when the vibration produces a wide range of changes in atmospheric pressure, the noise will be produced. The noise is then passed to the eardrum. The noise of the valve can be produced in many different ways, but the most common cause is the turbulence generated by the valve geometry and spread by the downstream pipelines. In many cases, the noise does not spread through the valve body, because the valve body itself is rigid and strong.

The turbulence will cause the vibration of the valve or valve components. The noise is caused by the vibration produced by random pressure fluctuations in the valve body, or by the vibration produced by obstacles in the fluid collision stream, such as valve core, valve discs, or other closing elements. When the closing element constantly strikes the guiding device, after a long time, it will cause the noise of the explosion.

Because its frequency level is lower than 1500Hz, it normally does not interfere with the observer. However, the sound of the explosion of these valve stems or shafts with a guiding device can damage the guide and the surface of the valve seat. Another side effect of the explosion noise of valve parts is the warning that the secondary turbulence produces when the turbulence is generated in the valve, so correction is necessary before the accident occurs.

Vibration can also be caused by some valve parts or accessories that resonate at their natural frequencies, which are often found at low noise levels (less than 100dBA). This type of noise is characterized by a single tone or buzzing sound (the frequency is between 300 and 700Hz).

Noise can also be caused by hydrodynamic or aerodynamic fluid sounds. For liquid handling, hydrodynamic noise is caused by flow, cavitation, and flashing turbulence, or by the high velocity generated when the fluid passes through the contraction section. In short, the noise generated by liquid does not produce high levels of noise and it can be tolerated by the staff.

In severe cavitation or flashing operations, the level of noise can reach a high level and must be handled by changing the technique or installing anti-cavitation components in the valve.

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Unplanned maintenance is often one of the most important property costs, and failures of mechanical seals and bearings are among the main causes. Keep in mind the potential value of choosing pumps that are more expensive initially, but last much longer between repairs.

The MTBF of a better pump can be one to four years longer than that of its unimproved counterpart. Consider that the published average values ​​of avoided pump failures range from US $ 2,600 to US $ 12,000. This does not include opportunity costs lost. A pump fire occurs by 1000 failures. Having fewer pump outages means less destructive pumping fires.

As we have seen, a typical pump failure, based on 2002 reports, costs an average of US $ 5,000. This includes the costs of equipment, parts, labor, and overhead. The MTBF extension of a 12- to 18-month pump would save the US $ 1,667 per year, which could be greater than the cost of improving the reliability of the centrifugal sanitary pump.

How To Maintain Your Sanitary Pump?

1. Clean and prepare the pump.
2. Check the oil.
3. Inspect pump impeller.
4. Tighten connecting elements.
5. Assess bearing damage.
6. Ensure your seals remain tight.
7. Clean your vents.

Conclusion

Thank you for reading our article and we hope it can help you better understand the maintenance of the sanitary pump. If you want to learn more about the maintenance of the sanitary pump, we would like to advise you to visit Adamant Valve homepage for more information.

The post Maintenance of the Sanitary Pump appeared first on Adamant Valves.

• Body: the framework that holds everything together and serves as the pressure boundary.
• Bonnet: the cover on the valve body. During valve manufacturing, the internal parts are put into the body and then the bonnet is attached to hold everything together inside. Some types of valves (ball valves for example) don’t have this part.
• Handle and Actuator: the handle is mainly used to manually open or close the valve; the actuator, pneumatic or electric, is used to automatically or remotely control the valve. Some valves, check valves, and relief valves, for example, have neither handle nor actuator because they automatically control themselves from the inside.
• Disc/Ball: a movable obstruction inside the body that controls the flow through the valve.
• Stem: the part that transmits the motion of the handle/actuator to the disc/ball.
• Packing: the seal between the stem and the bonnet that prevents leakage.
• Seat: the seating surface for the disc/ball.

Valves Operating Principle

Process plants consist of many control loops, networked together to produce a product. The control loops are devised to keep essential process variables such as fluid level, pressure, and temperature within the specified limit. This helps to ensure that the quality of the end product is as desired. Each of these loops creates internal disturbances that may affect the process variables.

Sensors and transmitters are used to collect information about the process variable. A control valve is an end device used to control the process based on this data. This helps to decide the course of action to get the process variable back to where it should be (set point).

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1. The manufacturing and inspection techniques of the valve blank are more complex

The casting blank of the valve is a structurally complex thin-walled shell piece. The castings require a smooth surface, and clearly cast words. In order to meet the above requirements, a series of technical measures need to be taken when we do the casting. These measures include the use of modeling materials of high refractivity, the use of a reasonable cap system, and the strict control of pouring speed and temperature. Modeling should be stratified to ensure sand hardness.

Due to the high technical requirements, the casting technique of the valve blank is much more complicated than that of the general casting.

Moreover, in addition to checking the size, location precision, and appearance, some valve blank also undergoes various tests such as microstructure, mechanical properties, corrosion resistance, and non-destructive flaw detection. Therefore, the inspection technique of the valve is more complex.

2. The installation of valve parts on machine tools is rather difficult

The structure and shape of the main parts of the valve are complex. Some parts are thin-walled, slender pieces, so the rigidity is poor. When machining on the machine tools, it’s difficult to position and clamp, so we often need to use specially-designed clamping devices.

For some valve parts, the precision of the positioning base surface is low, the surface roughness is high. Sometimes it even uses non-processing surface positioning. However, the requirement for the precision and surface roughness of the processed sealing surface is high, so it’s very hard to guarantee the processing quality.

Thus, in order to meet the needs of the technique, we often need to improve the precision of positioning the base surface and reduce the surface roughness, or produce a positioning base surface on a non-processing surface, which increases the complexity of the valve manufacturing technique.

3. Difficult to do mechanical processing

Due to the wide variety of valve materials, except for various cast iron and carbon steel, the shearing performance of most high-strength, corrosion-resistant, and high hardness materials is very poor, which makes it difficult for the parts to meet required processing precision and surface roughness.

And the requirement for the geometrical precision and surface roughness of the sealing surface of the valve is very high, this furthermore increases the difficulty of mechanical processing of the valve. Meanwhile, the valve materials have a poor shearing performance, which brings a lot of new problems to the processing method, tool materials, amount of shearing, technological equipment, etc.

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The companion pipefitters deal with industrial/commercial/marine piping and heating/cooling systems. The typical industrial process pipe is under high pressure, requiring metals such as carbon steel, stainless steel, and many different metals fused together by cutting, threading, grooving (Victaulic), bending, and precise welding.

A plumber focuses on low-pressure piping systems for wastewater and drinking water (tap water), industrial, commercial, institutional, or residential atmospheres.

Utility piping typically consists of copper, PVC, CPVC, polyethylene, and galvanized pipe, usually glued, welded, or threaded. Other types of piping systems include steam, ventilation, hydraulics, chemicals, fuel, and oil. Sanitary fittings also play roles for pipefitters.

In Canada, pipefitting is classified as a compulsory trade and carries a voluntary “red seal” of interprovincial standards. Apprentice pipefitters are provincially controlled and regulated and, in some cases, are eligible for similar trades at the end of their training.

In the United States, many states require that pipefitters be licensed. Requirements vary from state to state, but most include four to five years of apprenticeship.

Union fitters are required to pass an apprenticeship test (often called a “participation test”) before becoming a qualified journeyperson.

Others may be certified by the NCCER (formerly the National Center for Construction Education and Research).

The post Working as a Pipefitter in North America appeared first on Adamant Valves.

• Seat Leakage: the quantity of test fluid passing through an assembled valve in the closed position under the test conditions as defined.
• Rated Travel: the valve travel at which the manufacturer’s rating is established.
• Rated Valve Capacity: the quantity of test fluid (air or water) that would pass through the valve at rated travel under the stated pressure conditions as determined by the appropriate equations and manufacturer’s ratings.
• Valve Flow Coefficient (Cv): the amount of 60°F water in US gallons per minute that will flow through a valve with a one pound per square inch pressure drop.
• Balancing Valve: The valve that keeps a fluid distribution system in balance by adjusting the flow rates at different positions (through the component terminal lines, distributing lines and main distributing lines) corresponding to the flow rates specified for the design of the system.
• Metal to Metal Valve: valve with a metal plug and metal seat.
• Soft Seat Valve: either the plug or seat or both are made from some kind of composition material such as Teflon and the like.

Currently, the American Nation Standard has established a document named ANSI/FCI 70-2 2006 (European equivalent standard IEC 60534-4 (International Electrical Commission Standard 60534-4)) defining six seat leakage classes, Class I – Class VI, to aid and guide manufacturers and users of sanitary valves.

Control Valve Leakage Classification – Overview

The leakage limit for Class VI

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As the use of regulating valve is very wide, the working condition of the sealing surface varies greatly. The working pressure can range from vacuum to super-high pressure. The working temperature can be from minus 296 degrees Celsius to 816 degrees Celsius. On some occasions, the working temperature can be up to 1200 degrees Celsius.

The working medium ranges from non-corrosive medium to various acid, alkali, and other strong corrosive media. Judging from the force endured by the sealing surface, it is subject to squeezing force and shearing force. From the tribological point of view, there are abrasive wear, corrosion wear, surface fatigue wear, erosion, and so on. Therefore, according to different working conditions, we should select the appropriate sealing surface material.

1. Abrasive wear

This kind of wear happens when a rough hard surface slides on the soft surface. When hard materials push into the softer material surface, there’ll be a small groove on the contact surface. The materials falling off this groove are pushed away from the surface of the object in the form of debris or loose particles.

2. Corrosion wear

When the metal surface is corroded, there will be a layer of oxide. This layer of oxide is usually covered in the part where corrosion occurs so that further corrosion of the metal can be slowed down. However, if there’s a slide, it will remove the oxide from the surface, making the exposed metal surface further corroded.

3. Surface fatigue wear

Repeated cycled loading and unloading will cause fatigue cracks on the surface or lower part of the surface, forming debris and pits on the surface, which eventually leads to damage to the surface.

4. Erosion

It is caused by sharp particles impacting the surface of the object. It is similar to abrasive wear, with the surface rougher.

5. Scratch

This happens during the process of relative movements between sealing surfaces, in which the damage is caused by the friction of the materials.

Conclusion

Only with good working conditions, maintaining a harmonious temperature and pressure ratio, and reasonable corrosion data can our valves have a longer service life and maintenance-free period.

The post What Cause The Valve Sealing Surface Damage? appeared first on Adamant Valves.