how does a mechanical seal work pricelist

A mechanical seal is simply a method of containing fluid within a vessel (typically pumps, mixers, etc.) where a rotating shaft passes through a stationary housing or occasionally, where the housing rotates around the shaft.

When sealing a centrifugal pump, the challenge is to allow a rotating shaft to enter the ‘wet’ area of the pump, without allowing large volumes of pressurized fluid to escape.

To address this challenge there needs to be a seal between the shaft and the pump housing that can contain the pressure of the process being pumped and withstand the friction caused by the shaft rotating.

Before examining how mechanical seals function it is important to understand other methods of forming this seal. One such method still widely used is Gland Packing.

Packing needs to press against the shaft in order to reduce leakage – this means that the pump needs more drive power to turn the shaft, wasting energy.

The stationary part of the seal is fitted to the pump housing with a static seal –this may be sealed with an o-ring or gasket clamped between the stationary part and the pump housing.

The rotary portion of the seal is sealed onto the shaft usually with an O ring. This sealing point can also be regarded as static as this part of the seal rotates with the shaft.

One part of the seal, either to static or rotary portion, is always resiliently mounted and spring loaded to accommodate any small shaft deflections, shaft movement due to bearing tolerances and out-of-perpendicular alignment due to manufacturing tolerances.

The primary seal is essentially a spring loaded vertical bearing - consisting of two extremely flat faces, one fixed, one rotating, running against each other.  The seal faces are pushed together using a combination of hydraulic force from the sealed fluid and spring force from the seal design. In this way a seal is formed to prevent process leaking between the rotating (shaft) and stationary areas of the pump.

If the seal faces rotated against each other without some form of lubrication they would wear and quickly fail due to face friction and heat generation. For this reason some form of lubrication is required between the rotary and stationary seal face; this is known as the fluid film

In most mechanical seals the faces are kept lubricated by maintaining a thin film of fluid between the seal faces. This film can either come from the process fluid being pumped or from an external source.

The need for a fluid film between the faces presents a design challenge – allowing sufficient lubricant to flow between the seal faces without the seal leaking an unacceptable amount of process fluid, or allowing contaminants in between the faces that could damage the seal itself.

This is achieved by maintaining a precise gap between the faces that is large enough to allow in a small amounts of clean lubricating liquid but small enough to prevent contaminants from entering the gap between the seal faces.

The gap between the faces on a typical  seal is as little as 1 micron – 75 times narrower than a human hair.  Because the gap is so tiny, particles that would otherwise damage the seal faces are unable to enter, and the amount of liquid that leaks through this space is so small that it appears as vapor – around ½ a teaspoon a day on a typical application.

This micro-gap is maintained using springs and hydraulic force to push the seal faces together, while the pressure of the liquid between the faces (the fluid film) acts to push them apart.

Without the pressure pushing them apart the two seal faces would be in full contact, this is known as dry running and would lead to rapid seal failure.

Without the process pressure (and the force of the springs) pushing the faces together the seal faces would separate too far, and allow fluid to leak out.

Mechanical seal engineering focuses on increasing the longevity of the primary seal faces by ensuring a high quality of lubricating fluid, and by selecting appropriate seal face materials for the process being pumped.

When we talk about leakage we are referring to visible leakage of the seal. This is because as detailed above, a very thin fluid film holds the two seal faces apart from each other. By maintaining a micro-gap a leak path is created making it impossible for a mechanical seal to be totally leak free. What we can say, however, is that unlike gland packing, the amount of leakage on a mechanical seal should be so low as to be visually undetectable.

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Many tools can seal used when installing mechanical sealals that are not readily available, Alibaba.com offers a variety of mechanical seal tools that can seal used when installing mechanical sealals. This seal is not only for mechanic, but they are also in need of this material.

The many benefits of mechanical seals are that they offer, as they are less resistant to wear and tear on all occasions. Mechanical seals are the most durable, and seal option for those that require a lot of water and air at the same time.

Hydraulic seals are ideal for those that require higher pressure to maintain. On the other hand, the plunging seal is a common choice of mechanical seals, such as those with OKO"s, they all use the same functions of water and gas.

Often mechanical seal are specified incorrectly, however our engineers are able to make suggestions as to why the seal was failing, offereing alternate component material or seal design in general.

For optimal performance and life span, a mechanical seal must be correct for the job. A poorly performing seal is an expense waiting to happen. If your plant uses many seals, major savings can be realized annually by rebuilding and modifying seal components!

We do not sub-contract out job orders, so our our customers benefit from faster service and lower service costs since all work is done under one roof.

Modern pumps, compressors, mixers, agitators and other rotary shaft equipment are assembled using either compression pump packing or mechanical seals to minimize emissions and fluid.

Compression pump packing controls leakage whereas mechanical seals will tend to stop any visible leakage all together, keeping work environment clean and hazard free.

Compared to compression packing the initial cost of a mechanical seal is high, however overtime, the associated cost accrued by using compression packing, for example power consumption, maintenance and downtime, could be far in excess of the initial cost of a mechanical seal, which works unattended for a long time.

Mechanical seals are usually made of moving rings, stationary rings, compression elements and sealing elements. These parts are tightly bonded to form a sealing surface to avoid leakage. The liquid in the sealed chamber causes the end face to press against the end face of the stationary ring, and the mechanical seal occurs on the end faces of the two rings and the adhesion is to maintain the compression of the component pressure. The pump can not only work in the state, but also adhere to the end of the paste to ensure that the sealing medium does not leak, and avoid impurities into the sealed end. The sealing element acts as a gap between the sealing ring and the shaft, the action of the static ring and the gap of the gland, and the oscillation of the pump with the elastic element. When running with other components of the pump, the condition of the mechanical seal is closely linked with the external conditions. Only if the parts, auxiliary sealing equipment and technical requirements are ensured that the mechanical seal works well.

First, we need to turn off the pump, and then clean and inspect each part of the pump. Second, remove the impeller by rotating it in the anticlockwise direction. Then take out the seal at the backside of the impeller, and place the mechanical seal on to the shaft. Fix the mechanical seal and screw the impeller onto the motor shaft. Here are some notes of installation:

The compression quantity of the spring should be carried out according to the regulations. Bigger or smaller are not allowed. The error should be within 2 millimeters;

To ensure the beard can move flexibly on the shaft. And the spring should be able to automatically bounce back when the dynamic ring compressing the spring.

With its wide range of designs, the mechanical seals can also be made of different materials. In fact, the seal face materials decide the service time of mechanical seals. The most popular materials include rubber, stainless steel, PTFE, carbon, ceramic, Sic, and TC.

In SEALCON, equipped with advanced CNC processing equipment, you can not only buy the mechanical seals, but also buy the mechanical spare parts: sealing rings, spring, O-ring, sleeve and gland. All of our products conform to the standard of DIN24960, EN12756, ISO3069 API610, API682.

Mechanical seals form a critical part of any mechanical operation involving fluid movement through rotational shafts, such as in the case of pumps. These seals ensure that the fluid does not leak out of a closed system and contaminants do not enter the system. In pumping applications, mechanical seals are placed at the point of entry or exit of a rotating shaft, preventing the pressurized fluid from escaping the pump housing and withstanding the friction generated from the shaft rotations.

Mechanical seals are devices that accommodate a rotating shaft while containing and preventing the fluid from leaking out of the enclosed housing. While different mechanical seal designs are available for pumping applications, most have three sealing points.

These three sealing points ensure that the fluid contained within the pump housing does not leak while also preventing dust particles in the atmosphere from entering the housing.The mechanical seals are usually made up of different materials to prevent sticking. Typically, one side of the seal uses softer materials like carbon graphite, and the other is made of harder materials such as silicon carbide or ceramic alumina. However, hard materials are preferred for both surfaces if the pumping application involves abrasive fluids.

In addition to the two materials, the sealing unit also comes with O-rings to seal the stationary face on the housing side and the rotating face on the shaft side. Springs are also used to keep both faces pressed.

In most cases, the two faces of the seals are also lubricated to prevent friction and wear. Depending on the application, this fluid film can either be a separate lubricant or the process fluid itself.

Mechanical seals can be selected based on the type of pump application. Choosing the wrong seal can affect pump performance and lead to damage and costly repairs.An unbalanced mechanical seal is preferred if the pump needs to operate at a lower pressure. However, high pressure pumping applications require balanced mechanical seals. Balanced seals also perform better in high temperature operating conditions. Cartridge seals require less maintenance but are more expensive, hence used for limited applications.

At Hayes Pump, we have a fully staffed, factory-trained parts department to help you quickly with the correct mechanical seal for your pump. You canrequest a quotefor your part orcontact usto get further assistance.

In the beginning, water ran freely over the Earth. Then, man made pumps to make water run where he wanted it. Then came leaks. Then, man made pump seals. And as time went on, man still continued to struggle with leaking pump seals.

For those who are new to pump maintenance and repair, mechanical seals can be intimidating—given their reputation as temperamental devices that fail frequently. In fact, they are simple devices that are often misapplied and sometimes poorly installed or used on pumps that are ill-suited for the application. For many applications, mechanical seals are robust enough to tolerate less-than-optimal handling and operating conditions. For more demanding applications, though, everything must be right.

It is important to review how a pump mechanical seal works. First, its main components are the rotating and stationary face rings that form the primary seal (Image 1). The face rings have flat, precision-smooth contact surfaces that are held in tension against each other by mechanical springs.

The rotating face ring and its assembly have to be sealed to the shaft. The stationary face ring has to be sealed to the housing. These two sealing points are called secondary seals and typically use elastomer O-rings or boots (Image 2).

Selecting the proper materials for the primary and secondary seal components is important. For common water pumping applications, carbon-ceramic face material and Buna-N secondary seals are standard and work well. Alternate materials work better for pumping sewage or strong chemicals, so many technicians seek outside help on these applications.

By following a few precautions, it is not difficult to install pump mechanical seals during the repair process. For example, to ensure the elastomer secondary seals will slide into place undamaged, always use the proper lubricant. Some seal providers offer water-soluble lubricants designed for this purpose. Make sure the lubricant is water-soluble (except with oil-filled seal chambers), so that it will be washed away by pump operation.

In all cases, avoid damaging the elastomer secondary seals on the edges of shaft shoulders, keys or housings. A good way to accomplish this is to wrap a sheet of mylar paper around the shaft to protect the seal as it is slid into place.

While the amount of tension the seal spring assembly applies can be a concern on some special applications, the tension adjustment on common utility pumps is preset by the pump and seal design. Just observe during disassembly if there are any tensioning provisions and, if so, document the measurements.

When a seal leakage problem occurs, carefully inspect the seal to determine the cause. Is it leaking at the primary seal or at one of the secondary seals? The wear pattern of primary seal faces should be smooth and slightly shiny, and the elastomer secondary seals should be pliable but not soft. The shaft and housing contact surfaces should be corrosion free; corrosion at those contact points would indicate a leak.

If the cause of a problem is difficult to determine, many value-added seal providers can analyze seal failures, ask critical questions about the application and recommend products that will perform best. Their prices may be more than some alternatives, but their value added is the knowledge to spec the right product.

If unsure about how to find a good, value-added seal provider, do an internet search for “industrial pump seals” in the required zip code. In major metropolitan areas, there are probably three or four likely prospects. Ask each of them for a seal for a boiler feedwater pump (or other tough application). If they only ask for the pump ID or the dimensions but not the temperature, pressure or other application parameters, they probably will not be much help. Users may get a great price, but on the wrong product.

Eugene Vogel is a pump and vibration specialist at EASA, Inc. in St. Louis, Missouri. He may be reached at 314-993-2220. EASA is an international trade association of more than 1,800 firms in nearly 70 countries that sell and service electromechanical apparatus. For more information, visit easa.com.

A mechanical seal is simply a method of containing fluid within a vessel (typically pumps, mixers, etc.) where a rotating shaft passes through a stationary housing or occasionally, where the housing rotates around the shaft.

When sealing a centrifugal pump, the challenge is to allow a rotating shaft to enter the ‘wet’ area of the pump, without allowing large volumes of pressurized fluid to escape.

To address this challenge there needs to be a seal between the shaft and the pump housing that can contain the pressure of the process being pumped and withstand the friction caused by the shaft rotating.

Before examining how mechanical seals function it is important to understand other methods of forming this seal. One such method still widely used is Gland Packing.

Packing needs to press against the shaft in order to reduce leakage – this means that the pump needs more drive power to turn the shaft, wasting energy.

The stationary part of the seal is fitted to the pump housing with a static seal –this may be sealed with an o-ring or gasket clamped between the stationary part and the pump housing.

The rotary portion of the seal is sealed onto the shaft usually with an O ring. This sealing point can also be regarded as static as this part of the seal rotates with the shaft.

One part of the seal, either to static or rotary portion, is always resiliently mounted and spring loaded to accommodate any small shaft deflections, shaft movement due to bearing tolerances and out-of-perpendicular alignment due to manufacturing tolerances.

The primary seal is essentially a spring loaded vertical bearing - consisting of two extremely flat faces, one fixed, one rotating, running against each other.  The seal faces are pushed together using a combination of hydraulic force from the sealed fluid and spring force from the seal design. In this way a seal is formed to prevent process leaking between the rotating (shaft) and stationary areas of the pump.

If the seal faces rotated against each other without some form of lubrication they would wear and quickly fail due to face friction and heat generation. For this reason some form of lubrication is required between the rotary and stationary seal face; this is known as the fluid film

In most mechanical seals the faces are kept lubricated by maintaining a thin film of fluid between the seal faces. This film can either come from the process fluid being pumped or from an external source.

The need for a fluid film between the faces presents a design challenge – allowing sufficient lubricant to flow between the seal faces without the seal leaking an unacceptable amount of process fluid, or allowing contaminants in between the faces that could damage the seal itself.

This is achieved by maintaining a precise gap between the faces that is large enough to allow in a small amounts of clean lubricating liquid but small enough to prevent contaminants from entering the gap between the seal faces.

The gap between the faces on a typical  seal is as little as 1 micron – 75 times narrower than a human hair.  Because the gap is so tiny, particles that would otherwise damage the seal faces are unable to enter, and the amount of liquid that leaks through this space is so small that it appears as vapor – around ½ a teaspoon a day on a typical application.

This micro-gap is maintained using springs and hydraulic force to push the seal faces together, while the pressure of the liquid between the faces (the fluid film) acts to push them apart.

Without the pressure pushing them apart the two seal faces would be in full contact, this is known as dry running and would lead to rapid seal failure.

Without the process pressure (and the force of the springs) pushing the faces together the seal faces would separate too far, and allow fluid to leak out.

Mechanical seal engineering focuses on increasing the longevity of the primary seal faces by ensuring a high quality of lubricating fluid, and by selecting appropriate seal face materials for the process being pumped.

When we talk about leakage we are referring to visible leakage of the seal. This is because as detailed above, a very thin fluid film holds the two seal faces apart from each other. By maintaining a micro-gap a leak path is created making it impossible for a mechanical seal to be totally leak free. What we can say, however, is that unlike gland packing, the amount of leakage on a mechanical seal should be so low as to be visually undetectable.

Mechanical shaft seals are the best way to seal a pump. Face seals prevent leakage better than packing and if selected properly will last longer. Mechanical seals used in clean well lubricated applications can last 20 years. Seals can be constructed in single or double configurations, allowing only a vapor to escape.

Shaft seals are engineered forshaft-sealingapplications to serve Original Equipment Manufacturers or field replacement requirements, our seals will hold up to difficult applications. We can also asset in theconversion from braided pump packing to a mechanical seal.

American Seal and Packing delivers a full range of rotary mechanical seals configurations and component materials - to handle pump service requirements in a wide range of industries. . When you Specify a AS&P seals you have the advantage of proven reliability. When we need engineered seals for difficult applications we utilize the engineering departments of some of the top mechanical seal manufacturersin the world.

Mechanical seals form a critical part of any mechanical operation involving fluid movement through rotational shafts, such as in the case of pumps. These seals ensure that the fluid does not leak out of a closed system and contaminants do not enter the system. In pumping applications, mechanical seals are placed at the point of entry or exit of a rotating shaft, preventing the pressurized fluid from escaping the pump housing and withstanding the friction generated from the shaft rotations.

Mechanical seals are devices that accommodate a rotating shaft while containing and preventing the fluid from leaking out of the enclosed housing. While different mechanical seal designs are available for pumping applications, most have three sealing points.

These three sealing points ensure that the fluid contained within the pump housing does not leak while also preventing dust particles in the atmosphere from entering the housing.The mechanical seals are usually made up of different materials to prevent sticking. Typically, one side of the seal uses softer materials like carbon graphite, and the other is made of harder materials such as silicon carbide or ceramic alumina. However, hard materials are preferred for both surfaces if the pumping application involves abrasive fluids.

In addition to the two materials, the sealing unit also comes with O-rings to seal the stationary face on the housing side and the rotating face on the shaft side. Springs are also used to keep both faces pressed.

In most cases, the two faces of the seals are also lubricated to prevent friction and wear. Depending on the application, this fluid film can either be a separate lubricant or the process fluid itself.

Mechanical seals can be selected based on the type of pump application. Choosing the wrong seal can affect pump performance and lead to damage and costly repairs.An unbalanced mechanical seal is preferred if the pump needs to operate at a lower pressure. However, high pressure pumping applications require balanced mechanical seals. Balanced seals also perform better in high temperature operating conditions. Cartridge seals require less maintenance but are more expensive, hence used for limited applications.

At Hayes Pump, we have a fully staffed, factory-trained parts department to help you quickly with the correct mechanical seal for your pump. You canrequest a quotefor your part orcontact usto get further assistance.

A singlemechanical seal consists of two very flat seal faces that are forced together by a spring and slide against one another. Between these two faces is a thin fluid film generated by the process fluid or pumped product. This fluid film (typically gap of 1 micron or 75 times narrower than a human hair), lubricates and cools the seal. An absence of this thin fluid film (pump running dry or product flashing) results in frictional heat and ultimately the destruction of the mechanical seal.

The sealed fluid typically enters the gap between the seal faces as a liquid. As it migrates across the seal faces from the high-pressure side to the atmosphere, its pressure drops, and temperature rises. The liquid may vaporize so there may be no visible liquid leakage. A correctly specified seal operating properly will typically meet VOC emissions standards.

A dual mechanical seal consists of two seals arranged in a series. The inboard seal keeps the product contained within the pump housing. The outboard seal prevents the barrier or buffer liquid from getting into the atmosphere.

Double Seal: With barrier fluid pressure higher than product pressure the seal prevents leakage of toxic or hazardous fluids into the environment. The barrier fluid provides lubrication to seal gasses and non-lubricating fluids.

Tandem Seal: By using a buffer fluid with pressure to lower than process, the seal can reduce the pressure differential across a single set of seal faces.

Spare Seal: With unpressurized buffer fluid the outboard seal operates “at idle” as a standby seal. If the inboard seal fails, the outboard seal provides primary protection, eliminating unscheduled shutdown of batch processes.

The PSS Shaft Seal is a mechanical face seal. The sealing surface is created between the flat surfaces of the rotating stainless-steel rotor and the stationary carbon flange. The stationary carbon flange is attached to the front side of the bellows with hose clamps, and the back end of the bellows fits over the stern tube and is secured with hose clamps. The stainless-steel rotor is fitted on the shaft in front of the carbon flange. The stainless-steel rotor compresses the bellows before the rotor is secured to the shaft with set screws. This compression (pre-load) maintains constant contact between the two flat faces of the stainless-steel rotor and carbon flange, allowing the PSS to compensate for the variable fore and aft movement due to propeller thrust. In addition, the carbon flange is over-bored to the shaft diameter allowing it to float around the shaft and thus compensate for most misalignment and vibration problems. The stainless-steel rotor is sealed to the shaft by two O-rings recessed into the collar"s bore. These O-rings rotate with the shaft and stainless-steel rotor and do not experience wear during operation.

Technology has gone through a boon: electrical and mechanical engineering fields have seen unprecedented growth. The industry is churning out innovations never thought of before, and we are ushering into a new era of technological advancement.

One such technological advancement is Industrial Robotics. Industrial robotics refers to the production of robots to work on assembly lines. They can automate many menial jobs and increase efficiency. The market for industrial robots is growing at about 10 percent a year.

Due to their immense importance in the industry, assembly line robots must have flawless designs. Even minor problems in robot manufacturing can collapse the entire supply chain.

To make industrial robots, you must use the best quality materials, from mechanical seals to locomotive devices. Read on about the importance of using premium-quality mechanical seals in industrial robots.

A mechanical seal is a method to contain fluid inside a machine and stop it from leaking. When the rotating shaft passes through a stationary case, there is a chance that the internal fluids may leak out, and a seal can prevent that.

As the rotating shaft enters the fluid compartment, the seal causes friction. Mechanical seals must allow the rotating shaft to work with minimal friction while stopping leakage.

Traditionally, this problem was overcome by gland packing. It involved packing the shaft with a braided, rope-like material to stop fluid leakage. However, the coating wears away over time and needs readjustment.

The filler also has to be pressed against the shaft to reduce leakage, which causes the pumping device to exert more power to rotate the shaft. Mechanical seals are better suited for industrial robots to minimize the need for maintenance and energy.

Robotics involves not only the correct mathematics but also quality building materials. Several factors can influence what mechanical seal you should buy for your robot:

Effective sealing would result in friction, and reducing friction would require compromising your sealing quality. Roboticists have to find the right compromise between friction and sealing effectiveness.

They allow just enough leakage that keeps the friction under control, with a vapor film forming on the seal. Reducing friction is particularly important as the robot must perform repeated, precise moments. Consider your calculations and determine how many effective seals you require.

Mechanical seals undergo wear and tear. Due to the friction between the seal and the shaft, seals wear off over the years. Industrial robots are made for long-running purposes, so they should have durable mechanical seals.

The material of the seal can impact its durability. Seals made of polytetrafluoroethylene (PTFE) are suitable for robots, as they resist degradation and provide low-friction performance, even with aggressive motors. And they do not require lubrication. These features ensure they last longer and make them ideal for industrial robots.

Robotics has made our economy change for the better. Assembly line automation has increased the efficiency of producing goods, which allows us to make more goods at lower prices. Industrial robots must be durable and high-quality to ensure smooth working.

Use premium materials in the manufacture of such robots. Consider using a durable mechanical seal from a reputable company, according to your sealing requirements, such as a PTFE seal.

You use a mechanical face seal, also known as a pump seal, to seal a water pump or centrifugal pump in a dynamic application. In the past, gland packing gaskets were used for this, but mechanical seals are a better alternative in many cases, as they reduce friction and leakage. Mechanical seals also have a longer useful life.

A mechanical seal always consists of a stator and a rotor. The stator is fixed in position in the pump cover and the rotor rotates with the shaft. You can purchase a complete mechanical seal from ERIKS. The individual components are also available separately.

Some mechanical face seals are directional. You should always check this. You can also purchase a non-directional product. However, the price tag is higher in the latter case.

All mechanical seals comply with the DIN 24960 standard. In addition, you can select these products based on metric or imperial measurements. Always consider the chamber diameter (for the stator), the shaft diameter (for the rotor) and the installation lengths for these parts. Once you know these dimensions, selecting the right product is fast and simple.

What if you want to replace an old mechanical shaft seal, but it is not available in the size you need? Simply filter based on equivalent types. You will quickly find the right pump seal.

The stators and rotors are available in different materials. The exact design you need depends on the conditions in your application. Always consider the medium and the temperature. The summary below provides concise information about the most popular materials and their properties.

If the medium in your application is a clean liquid, you can use a mechanical seal made from carbon and ceramic. However this design is not suitable for abrasive particles that lead to accelerated wear.

Do you process liquids with a slight degree of contamination in your application? If so, you should use a cemented carbide seal. This material is resistant to abrasive particles to a certain extent.

Silicium carbide can withstand high temperatures. You use this material for sealing highly contaminated liquids. It is also suitable for liquids containing abrasive particles.

The price of our mechanical seals for water pumps and centrifugal pumps is shown on the product pages. If the price is not immediately visible, it will be displayed after you have logged in.

The delivery time for a specific mechanical seal is indicated on the page for that product. If you need your seal faster, choose a different material that also works in your application.

Are you looking for a mechanical seal of a different size, shape, colour or material? Or do you need a mechanical seal for a special application, or one that meets specific certification requirements? Please contact us via the enquiry form and we will provide the support you need.