Category Archives: Valves & Pumps

Sanitary Ball Valve Overview

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The sanitary ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked.  The handle or lever will be in line with the port position letting you see the valve’s position. The ball valve along with the butterfly valve and plug valve, are part of the family of quarter turn valves.

 

Using ball valves in sanitary applications has some pluses and minuses. Perhaps the greatest benefit of using sanitary ball valves is that they usually work to achieve perfect shutoff even after years of disuse. They are therefore an excellent choice for shutoff applications and are often preferred to sanitary butterfly valves, diaphragm valves or seat valves. They do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose. The other big advantage ball valves have is that they are the highest pressure rated sanitary valves on the market.

 

Principles of Operation

 

Sanitary ball valves, as the name implies, have a ball with a hole drilled through the center swivel mounted with the valve body. When the hole in the ball is oriented in the same direction as the pipe, this will result in full flow rate. As the hole in the ball is oriented away from the direction of the pipe, the flow rate will be restricted and finally cut off completely when the hole is oriented 90 degrees to the pipe direction.

 

Automation

 

Like sanitary butterfly valves, most sanitary ball valves can be highly automated.  Ball valves are offered with stainless steel actuators for all sizes.  There are different switch packages available which to mount to the actuators. Double rack and pinion pneumatic actuators are the standard for ball valves, because they are ¼ turn valves.  Also the same as the butterfly valves, ball valves have a large offering of different ¼ turn actuators on the market.

 

Other Features and Benefits

 

Many different manufacturers offer their version of a ball valve although the operational features are very similar. In the market of ball valves there are many different alternative choices so that potential customers are easily able to find another choice. For this reason it is important to decipher a customer’s needs for the application at hand. This will make it possible to choose the one that will be a quality performer at a good price.

 

Like the butterfly valve, a ball valve is available in 316 as well as AL6XN and Titianium material. This type of construction material is not available with all manufacturers, as well as, it can be difficult to find MTRs and C of C’s to go along with the desired valve.  There are multiple handle styles that are offered with the ball valve as well, such as, pull stop with a locking mechanism and trigger handles. Ball valves have the luxury of coming with many different connection styles in order to be able to fit into a customized sanitation process line.

 

Are Sanitary Ball Valves Really Clean?

 

As we discussed with the butterfly valve. What is considered “sanitary” is relative to each end user. The fact that sanitary ball valves are constructed of 316 stainless steel, have FDA approved elastomers and have Tri-clamp or tube OD butt weld ends puts them in the sanitary realm. But you really cannot truly clean it in place. Ball valves have cavities and crevices behind the ball that gather product when the valve in being actuated. These areas do not get clean during CIP. To truly clean the valve, you have to take it apart.  Even with newer designs of ball valves having FDA approved cavity fillers to help limit product build up on the inside of the vale it is inevitable that product will still accumulate around the outside of the ball and orifices. Because of the sanitary ball valve do not carry the 3A rating.

 

TARGET VALVE is the professional valves manufacturer in Taiwan. You can find a variety of valve products on their website. Such as 1 pc ball valve, economic ball valves, flanged ball valves, multiway ball valves, and sanitary ball valves etc. Learn more details, welcome to check out their website and feel free to contact them directly.

 

 

Article Source: https://hollandaptblog.com/2014/01/17/1106/

When to Use Swing Check vs Wafer Check Valve

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When it comes to check valves, swing checks and wafer checks are actually similar in many ways. Both serve to block back flow from occurring in a pipe line. Both use a swinging disc to block and allow flow in one direction. The differences in the two valves may seem obvious when you look at them, but many users don’t realize the difference it might make in their application.

 

Wafer check valves get their name from their wafer thin design. These valves are sleek and made to fit in tight spaces between two flanges. There are no controls on this valve. The main component of the valve is a swinging disc in the center that opens in one direction and closes if liquids flow back the other direction.

 

Swing check valves, as the name implies, also uses a swinging disc to allow or block flow. The difference between the two is in the body design. Swing check valves are not designed for extremely tight spaces like the wafer check. They have molded bodies around the area where the disc opens up. This is the most important difference between the two types of valve.

 

While at first glance this may just seem like a space issue, the presence of a valve body as opposed to the bare bones wafer check actually makes a big difference in the functionality of the valve. Because wafer check valves are flanged in place, there isn’t much room for the disc to open in the pipe line. That means flow is often restricted with a wafer check valve.

 

Swing check valves on the other hand, have a molded body that creates room for the disc to swing open fully, thus allowing full flow. As you can imagine, this is immensely important if your application requires full flow. For this reason, we recommend wafer check valves for applications where flow is not an issue, and swing check valves when a full port valve is required.

 

You can easily find a reputed and well-known provider of these different types of valves on the internet such as the NICO VALVES CORP. This company always offers the best quality wafer check valves and other valves to you. Learn more information about valves, try to check out NICO’s website here: www.ni-co.com

 

 

Article Source: https://www.commercial-industrial-supply.com/resource-center/use-swing-check-vs-wafer-check-valve/

Tips to Help with Choosing the Right Valve for Your Project

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Valves are useful pieces of equipment that help control, limit, and shut off flow in a system. In a garden irrigation system, you could use valves to control when different plants get watered. While it is universally agreed that valves are helpful, choosing the right valve can be frustrating. We hear many customers make statements like these: “So many types exist! Some of them do similar things! I don’t know what types of valves to use!”

 

In this article, we will outline what makes each unique valve. For basic users, the most important thing to remember is that a valve does one of two things: shut off or regulate. Some valves can do either/both, but this is a simple way to think of what you need a valve to do. It could help you in picking the right valve. We will now cover each of the major valve categories.

 

Ball Valves

Ball valves are a good example of a shut off valve. They use a spherical seating to stop or allow flow. The ball has a hole through the center, so fluid can pass through when the handle is turned to the “on” position. When the handle is turned 90 degrees to the “off” position, fluid hits the solid side of the ball and is stopped.

 

Butterfly Valves

Butterfly valves can function as a shut off valve or as a regulatory valve. They can fully shut off flow or be kept partially open, which limits flow. Controlling flow can be extremely helpful if you want to decrease pressure in a system. Fluid passing through a small opening will be restricted, making pressure further down the pipeline lower, depending on how far open the valve is. Butterfly valves can also be used as typical 90-degree turn valves, just switching between “on” and “off” positions.

 

Gate Valves

Gate valves, while usually used as shut off valves, can also function as regulatory valves. They use a “gate” that drops or lifts to control flow. When the valve is open, the gate is stored in the tall upper section of the valve, which is where gate valves get their unique shape. Unlike the previous two valves, gate valves are not a quarter-turn valve. They use a hand wheel to open/close whereas ball and butterfly valves use a lever handle. This makes it easy to keep them partially open and also makes operation of any kind easier.

 

Check Valves

Check valves come in many forms. The primary function of check valves is to prevent backflow. This makes them regulatory valves, as they control flow direction. Check valves are controlled by the fluid in the pipeline instead an operator, which makes them different from the valves we have previously examined. Check valves come in many different forms, but we will just cover the two most common types.

 

Swing check valves are a type of valve that uses a swinging function to prevent backflow in a system. The clear PVC swing check valve to the right has a disc that swings open if fluid is passing through the desired direction. If anything tries to flow backwards, the disc is pushed closed, stopping flow. Swing check valves create minimal pressure drop, as the disc is pushed completely out of the way when in operation.

 

The other major type of check valve is the ball check valve. Ball check valves use a ball or half-ball seating to eliminate backflow. When fluid passes the desired direction, it hits the rounded side and passes around and through. If fluid tries to flow backwards, it hits the concave side of the half-ball, pushing the valve shut. Due to the fact that fluid must flow around and behind the ball to get through, ball check valves produce moderate pressure drop.

 

Diaphragm Valves

Diaphragm valves, while not one of the most common types of valves, are very interesting and serve a specific purpose. They are perfect for limiting pressure in a system, making them regulatory valves. These valves have a flexible diaphragm that lowers toward or rises from a “weir” or “saddle” seating. The effect is that only a limited amount of fluid is allowed to pass through.

 

Choosing the Right Valve

In the end, picking the right valve depends on what you need it to do. No two jobs are the same, so there is no one-size-fits-all valve solution. However, you should now have all the information you need to make an informed decision.

 

NICO VALVES CORP. is a leading industrial valve manufacturer in Taiwan and China. The company offers various valves such as check valve, ball valve, threaded end valve, wafer check valve etc. If you have any questions, try to check out NICO’s website and feel free to send inquiry to them.

 

Article Source: https://www.pvcfittingsonline.com/resource-center/choosing-the-right-valve/

Repair and Replacement of a Toilet Flush Valve

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The toilet flush valve is a key element in the toilet tank. The flush valve is not at fault very often.

 

The toilet flapper can cause the toilet to run intermittently or not flush correctly. Before you assume it is the flush valve make sure the flapper is not the culprit.

 

It includes a fill tube and the flapper and water inlet for the toilet bowl. Most replacement kits include a new gasket for the tank and bolts to hold the tank in place. You will want to replace the flush valve if the seal between the tank and the bowl is leaking and does not respond to tightening. Or if the flapper will not seat even after being replaced.

 

Replacing a Toilet Flush Valve

Draining the Tank

Draining the toilet tank is the first thing you want to do before working on a flush valve. Toilet tanks have a lot of water in them that can get everywhere. It is clean water, but still, it makes a mess.

 

Turn off the water supply to the toilet first. Most tanks have a fill line marked on the side of the tank. Some do not. You can use a marker to put a mark at the correct water level if it is missing. The new flush valve tube may be a different height than the old one.

 

With the water turned off, flush the toilet to drain out most of the water from the tank. Place a pail below the nut for the toilet tank inlet. Loosen the nut on the water supply line. If the water is off, you should not get much water from the supply line.

 

There will be about an inch of water left in the bottom of the tank. Sopping the water up with rags will be a tedious task. The best way to finish draining the tank is to loosen the nut to the toilet fill valve. Loosen the nut to the fill valve and let the water drain into the pail.

 

Any water that you do not remove is likely to wind up on the floor. Removing the toilet flush valve will completely open up the bottom of the tank. Draining the toilet tank prior to this step is important.

 

Removing the Toilet Tank Bolts

Removing toilet tank bolts begins with the right tools. The tops of the bolts usually take a large flat blade screwdriver. On the underside of the bolts you may find brass or plastic nuts. The plastic nuts may have wings on them that allow you to hold them with your fingers, this is nice feature.

 

Depending on the configuration of your toilet, you might need an adjustable wrench, box end wrench or even a deep socket wrench.

 

You may have gotten a tool with the toilet that was used to tighten these nuts. Your builder or plumber may have thrown it away. Finding it now may be a challenge. Before you begin, try to locate wrenches that you can use on the nuts in question.

 

The tank is held onto the base by two or three bolts that are visible from inside the tank. Many times you can hold the plastic nuts with your fingers. Loosed and remove both bolts. That’s all there is to it, the tank should be free. Place a piece of cardboard on the floor and pull the tank up from the base. Lay it on its back on the cardboard.

 

Removing the Flush Valve

After you have removed the tank from the base, removing a toilet flush valve is pretty easy. Lay the tank on its back to see the washer and nut for the flush valve.

 

Before you purchase a flush valve, make sure you know the size. Most of them are a nominal 3″ or 4″ diameter. If you are not certain, you want to take the old flush valve with you to match it up.

 

Certain brands of toilets have proprietary flush valves that only fit that brand of toilet. This is usually only true of more expensive toilets. If you are in doubt, check the internet for your model of toilet to see which flush valve it takes.

 

Remove the rubber washer from the base of the tank. There is a large plastic nut that holds the flush valve in place. Use a large pair of adjustable pliers to remove the nut, holding the valve assembly from the inside of the tank.

 

Remove the tubing that is connected to the top of the flush valve tube. Remove the large nut and the flush valve should be free. Remove and discard the old flush valve along with the flapper. You should have gotten a new one with the flush valve kit.

 

Installing a New Flush Valve

By this time you should have the old flush valve removed. Before installing the toilet flush valve you want to get the instructions for the new one. Follow the instructions on the new valve to properly locate the washers and nut.

 

Put the new flush valve into the tank and orient it appropriately the same way the old one was. There should be a washer between the valve and the tank, if it is supplied loose you will need to put it on. Put the plastic nut on and tighten it down.

 

Obviously, with plastic fittings you want to exercise some caution with tightening them. On the other hand, make sure the nut is snug. If you get a leak from this connection, you will have to start all over again. Yes that is correct, you won’t know until it is all put together and you turn the water on.

 

Place the main seal over the outlet and push it up to the bottom of the tank. Attach the tubing at the top of the fill valve. At this point the inside of the tank should look similar to how it was when you took it apart.

 

Replacing the Toilet Tank

You may want a little help replacing the toilet tank. It is fairly heavy with all of the parts inside. In addition, it is a little awkward to handle.

 

Put the tank back on the toilet base and start the bolts and washers through the holes. Put the wing nuts on and snug them up finger tight. Hold the wing nuts and use the screwdriver to tighten the bolts.

 

Tighten them down evenly, switching back and forth. Do not over tighten. Make sure the tank is secure.

 

Hook the flapper chain to the tank lever making sure that there is no slack. It should operate freely, up and down.

 

Make sure the nut for the fill valve is snug and then hook up the water supply. Tighten the nut for the water supply line, don’t over tighten it, and remember it is plastic. Turn the water back on and check for leaks. First check the water supply and then the main seal. No leaks, good. The float for the tank should still be set at the proper height.

 

When the tank stops filling, check the water level. Too low, adjust the float until the tank fills to the correct level. After that, flush the toilet. All your problems should be solved.

 

Summary

So replacing a toilet flush valve is a little bit of work. Taking the tank off sounds a little scary at first. Once you are past that it is a breeze. One big plastic nut and a few bolts to tighten. You have to do a leak check, but that’s not hard.

 

All done, toilets works great, Good Job! This is a home repair has a higher level of difficulty. By following the instructions and taking your time you were able to do it. What’s even better is that you saved some money, great.

 

If you are looking for high quality toilet flush valves, I recommend that you can visit the website of Kingsway Technology Inc. The company provides electronic flush valves both for toilet and urinal uses. Its products feature easy installation to convert manual flush valve to automation. Kingsway is the best choice of automatic sanitary products manufacturer for you.

 

 

Article Source: http://www.home-repair-central.com/repair-and-replacement-of-a-toilet-flush-valve.html

Fixed vs. Variable Displacement Vane Pumps

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A hydraulic drive system uses a pressurized fluid to deliver force to distant machinery. Each system has several common components; the most universal is the hydraulic pump. The pump’s purpose is to pressurize the hydraulic fluid so that it will travel down the line and perform work on the other side. In an ‘open loop’ system, the fluid is drawn from a reserve tank, and deposited into the same tank after it has done its work. In a ‘closed loop’ system, the fluid is brought directly back to the hydraulic pump after passing through a hydraulic filter.

 

Fixed Displacement Pumps

A fixed-displacement pump has a set flow rate — every stroke of the motor moves the same amount of fluid. Fixed-displacement pumps are

 

  • Simple
  • Relatively inexpensive
  • Easier to maintain

 

The simplest type of fixed-displacement pump is the gear pump, in which the hydraulic fluid is pushed by rotating gears. In some models, the gears are sequential; in the quieter and more efficient version, the gears are interlocking. Another common variation is the screw pump, which uses the classic Archimedes screw, which looks much like a drill bit, to move the fluid. They have the advantage of providing a high rate of flow at relatively low pressures.

 

Variable Displacement Pumps

In a variable displacement vane pump, the flow rate and outlet pressure can be changed as the pump operates. This results in pumps that are

 

  • More complex
  • More expensive
  • Capable of doing a wider variety of jobs

 

The most common type of variable-displacement pump is the rotary vane pump, which is a variation of the gear pump in which the ‘gear’ is offset and the ‘cogs’ aren’t fixed, but rather extend and retract as the gear turns, allowing the pump to increase the pressure of the fluid by compacting it as it pushes the fluid through. The top-tier pumps, however, are bent-axis piston-and-cylinder pumps, much like the ones that are used in an internal combustion engine.

 

Simple, fixed-displacement pumps are perfect for single jobs that need to be repeated indefinitely over long periods of time; variable displacement vane pumps can be used to power a wider variety of tools, but require more expense and more attention.

 

As the outstanding hydraulic pump supplier, Anson always follows our policy “Technology upgrading, quality insistence, comprehensive service “. Anson committed to provide high quality vane pumps for customers, including intra vane fixed displacement vane pump, variable displacement vane pump, and power mini-pack unit and so on products.

 

If you need more information about variable vane pump and hydraulic pumps, welcome to visit Anson’s website to obtain further details.

 

 

Article Source: http://peerlessengineering.com/blog/hydraulic-pumps-fixed-vs-variable-displacement/

Bad Valve Seals and Piston Rings Symptoms & Replacement Cost

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This discussion is about the symptoms of bad valve seals and piston rings as well as their basic functions and common cost of replacement. Valve seals and piston rings are crucial for the functionality of your engine. If you can recognize the signs of when these components have problems, then you can replace them right away before serious damage is done to your engine.

 

Functions of Piston Rings

 

The piston is located inside of a car’s engine. The piston ring comes in the form of a split type ring and you install it outside of the piston’s diameter. The piston ring’s main purpose is to assist in sealing the combustion chamber, manage the oil consumption of the engine, and to assist in transferring heat to the engine from the piston. It is important to note that the piston ring will eventually get worn out, which means you’ll have to replace it. You should go to a professional mechanic to have this replacement job done.

 

Functions of Valve Seals

 

After air and fuel are mixed together, valves are there to manage how much of the mixture flows through the cylinders before the combustion process takes place. Valves usually have sleeves on them which prevent the combustion gasses from seeping out of them. The tops of the valves also have seals on them which prevent oil from getting pulled down into the engine area. These seals are commonly constructed out of a super strength rubber material and they’re placed into a small collar of the valve stem’s top area. Once these valve seals start to get worn out, you’ll notice some major symptoms that are unique to this problem.

 

The Symptoms of Bad Valve Seals and Piston Rings

 

The symptoms of bad valve seals and bad piston rings are quite similar. Any time either one of them fails, the performance of the vehicle will be reduced along with other bad symptoms that are noticeable. Let’s take a look at some warning signs which might indicate that you have bad valve seals or piston rings.

 

  • Exhaust Smoke – If you notice thick smoke that’s a gray or white color, this indicates that your car is burning oil. The only way this could happen is if the oil is leaking into the combustion chamber of your engine.

 

  • Too Much Oil Being Consumed – If the piston rings are worn out and the valve seal is broken, this will be what allows oil to flow into the combustion chamber.

 

  • Not Enough Accelerating Power – When there is damage to the piston rings and valve seals, the compression will be reduced which causes you to lose power in your engine. As a result, you won’t be able to accelerate when you put your foot on the gas pedal.

 

Although bad valve seals and piston rings have similar symptoms, the time and costs of repairing them are quite different. That is why you should educate yourself about where the problem is coming from, whether it’s the valve seals or piston rings. Once you find out, you can save time and money from having a mechanic figure it out for you.

 

To investigate where the problem is coming from, there are a few tips you can follow which will help you out with this. You can open the spark plug, fill up the cylinder with some oil, do a compression test, remove the EFI fuse and crank the engine, and then see the result of the compression gauge. If the result of the compression test appears to be good or at least average, then the piston rings are likely the problem. However, if the results of the compression test are low or under average, then the valve seals are the problem.

 

Replacement Cost of Piston Rings

 

When replacing piston rings, the cost will be determined by several factors. The make and model of your vehicle is one example. You also have to consider the type of engine that’s in your car and the condition of it. Most mechanics are going to charge around $1,500 minimum to perform this job. Some may even charge as much as $2,500. The reason this replacement job is so expensive is because it is a complicated task. The engine of the vehicle has to be completely disassembled first and then the cylinders of the vehicle have to be reconditioned. After that, the car gets reassembled using all the parts that were taken off originally. Only an experienced mechanic can perform this task, which is a very long and intense project that takes several hours to do.

 

Replacement Cost of Valve Seals

If you have discovered there is damage to your valve seals, then have an auto technician install new oil seals. The cost of this replacement job will be between $900 and $1,800, depending on the make and model of your vehicle. The process of replacing the valve seals requires disassembling the entire engine until you can reach the valve spring. Take off the cylinder head cover, the spark plugs, pushrods, and rocker arms. The amount of time this will take depends on the make and model of your vehicle. Sometimes the technician may have trouble with this job, so they’ll dismantle and remove the cylinder head. Then they’ll use a cylinder kit as a replacement which contains a cylinder head gasket.

 

Conclusion

 

There are lots of reasons why damage can occur to valve seals and piston rings. But if you regularly maintain your vehicle and get it serviced, then the damage to these components will be minimal. Vehicles that are maintained poorly or have high mileage are prime candidates for having damaged valve seals and piston rings.

 

If you are interested in learning more information about valve seals, try to visit the website of AOK Valve Stem Seals Ltd. AOK is a Taiwan local company of specializing in producing bonded seals, O-rings, and valve stem oil seals. Feel free to contact AOK you will obtain the details you need.

 

 

Article Source: http://cartreatments.com/valve-seals-and-piston-rings-symptoms-replacement-cost/

Hydraulic Modular Valves and Manifolds

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Valves are normally mounted onto a valve skid with piping at the rear, or underneath, to allow quick changes to be made for maintenance purposes. Piping can, however, be dispensed with almost totally by mounting valves onto a manifold block- with interconnections formed by drilled passages in a solid block or by cut-outs on a plate-formed manifold.

 

Modular valve assemblies allow piping to be reduced still further. These follow standards laid down by the Comit~ European des Transmission Oleophydrauliques et Pneumatiques and are consequently known as CETOP modular valves.

 

Modular valves consist of a base plate, shown in Figure 4.45a, and a wide variety of modules which may be stacked up on top. Figures 4.45b to d show some modules available. At the top of the stack a spool valve or crossover plate is fitted. Quite complicated assemblies can be built up with minimal piping and the ease of a child’s building block model.

CETOP Modular Valves

 

Mentioned modular valve, I can recommend you to visit the website of ASHUN if you are interested in learning more information about valves. Ashun was established in 1984 as a manufacturer for hydraulic and pneumatic products. For the hydraulic valves, they have 01 series modular valves, directional control valves, pressure control valves and flow control valves. Especially 01 series modular valves which can be afforded high pressure (31.5MPa) and large flow (40L/min).

 

Need further details about modular valves, please feel free to contact with ASHUN.

 

 

Article Source: http://www.valvehydraulic.info/valve-2/hydraulic-modular-valves-and-manifolds.html

Why Do Engineers Use Stainless Steel Ball Valves?

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As time goes on engineers continue to develop new technology improving operation services for a variety of businesses in a wide array of sectors. The form of the stainless steel ball valve is no different. It has altered in shape and has been modified to achieve maximum results over the years. It is a reflection of the technological advances that have been made by engineers today.

 

A steel ball valve is located inside a tube and enables waste fluids to travel through a passageway. The valve works by placing an existing hole in the steel ball then the placement of the ball is what controls the function of this valve. Once the holes are proceeding in the same direction as that of the passageways the valve stays open. The fluid begins to stream out in an uninterrupted manner. This is vital to the function of the contraption because if the holes are not lined up correctly then the valve closes and the fluid remains encased.

 

Why Stainless Steel?

 

To effectively execute its function, the valve needs to be strong and untainted when exposed to extreme temperatures and pressures. Sometimes the metal valves connect joints that carry a maximum of 200 degrees. Thus, it needs to handle working under such circumstances without dissolving or bowing. Engineers found this metal to fulfill all of these requirements and then some.

 

It also comes in different sizes and shapes. This is for you to find the exact valve size you need for your operations.

 

Also, these are able to come in two designs, sanitary or industrial. The sanitary ones are designed for the pharmaceutical, cosmetic, food, dairy and beverage industries. When you are looking to purchase one of these specify what industry you need the device for. This way you are guided towards equipment suitable to match your business needs.

 

In daily life, some recognizable valves are used in tap water, plumbing, dishwashers and hot water systems. It is easy to comprehend its mechanical function and purpose if you think about how veins and the heart work inside our own bodies.

 

Veins act as a valve permitting the flow of blood to the heart while maintaining a steady, correct pace. If you choose the right stainless steel ball valves for your business then it should act in the same manner.

 

Think about what type of business you are using the equipment for and narrow in on the products recommended, required by law and what material outlasts the rest.

 

Golden Highope Industrial Inc. Ltd. has specialized in manufacturing stainless steel ball valves since 1990, with years of experiences we provide only high quality ball valves to clients. Here we offer more various specification stainless steel valves for you to choose. Check the full Stainless & Carbon Steel Valve series on the website of Golden Highope and feel free to contact with us for further details!

 

 

Article Source: http://EzineArticles.com/7050531

What is a Pressure Control Valve and Why Do You Need It?

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Pressure control valves are found in virtually every hydraulic system, and they assist in a variety of functions, from keeping system pressures safely below a desired upper limit to maintaining a set pressure in part of a circuit.

 

Every pressure control valve switches (or controls) at a predetermined pressure setting. The switching pressure is generally a variable setting on the valve itself. A change in position of the pressure control valve (i.e. open or closed) occurs either gradually (by control) or suddenly (by switch). Pressure shut-off valves and pressure sequence valves are hydraulic valves with a fixed throttle whereas relief and reducing valves are hydraulic valves with a variable throttle.

 

Pressure valves are hydraulic valves that gradually (control) or suddenly (switch) change in position.

 

The most common types of pressure control valves are the pressure relief valve and the pressure reducing valve. Pressure relief valves control the system pressure by relieving part, or all, of the flow to tank. Pressure reducing valves reduce the pressure supplied to a sub-system of a hydraulic system. Sequence valves are used to direct the flow to a secondary circuit. Unloading valves are used to direct flow to tank at pre-set system pressure.

 

Type of Pressure Control Valves

 

  • Pressure valves, relief function
  • Pressure valves, reducing function
  • Pressure valves, fixed throttle

 

A hydraulic system can only function – as per requirements – by using valves. Thus, you should always look for the correct type of hydraulic valve to serve your intended purpose. You can try to browse the website of ASHUN, the professional hydraulic valves manufacturer in the industry, to get more information about pressure control valves. If you have any questions, welcome to contact with ASHUN via email or telephone!

 

 

Article Source: https://dta.eu/hydraulics/hydraulic-valves/pressure-controls/

Article Source: http://www.hydraulicspneumatics.com/200/TechZone/HydraulicValves/Article/False/6411/TechZone-HydraulicValves

Optimum Flow Control Contributes Towards Reducing Manufacturing Costs

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Oil and gas companies around the globe face the challenge of increasing production and delivering quality products while reducing resources and manufacturing costs. Process control has a financial impact and so reducing process variability is, therefore, a key factor in maximizing quality output and reducing costs. Comprehensive studies of control systems have shown that up to 80% of control loops have not performed satisfactorily in reducing process variability. In most instances, the control valve was found to be the major cause of the problem. Despite this, the impact of the flow control valve on dynamic performance is often overlooked.

 

Optimum flow control is imperative; choke and control valves are subject to a variety of technical phenomena and careful selection of the right control valve for each application is crucial.

 

Superior design features include the valve material, which should be resistant to the chemical composition of the flow medium. For example, discs and internals made of solid Tungsten Carbide, renowned for its erosion and cavitation resistant properties. Industrial diamond facings inserted on the discs have also produced some very good results under severe conditions. The sealing surface must not be in contact with the flowing medium to ensure seat tightness can be guaranteed for a longer period of time. The construction of the internals should ensure that the downstream of the back disc is abrasive resistant. This removes the majority of cavitation and erosive material from the sealing surfaces as well as from the valve body. The design of the internals must be able to absorb turbulence in the flow so that the outgoing flow is more laminar. Rotating choke disc valves are recommended for extremely severe applications.

 

Flow control valves are also optimized by using different shaped and sized throttling orifices in the rotating discs. This affects the Cv value of the valve and has a crucial impact on process control. The right valve size and trim must be chosen to match the process conditions.

 

For both new and existing applications, to ensure downtime is kept to an absolute minimum and additional costs are not incurred, flow control valves should ideally be engineered to fit with no modifications to existing pipework. This also ensures that any replacements can be made efficiently.

 

Ultimately, these design features coupled with repairable internals and easy maintenance maximize production output, lower life-cycle costs and extend the mean time between failures, providing an overall reduction in total cost of ownership.

 

Found in 1984, ASHUN has established a fine reputation worldwide. Our professional R & D team develops new products continuously to meet our customers’ needs. If you need more information about flow control valves or other valves, welcome to browse our website or contact with ASHUN directly!

 

 

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