mechanical seal diagram in stock

We specialize in hard-to-find seals and demanding applications. Our extensive network of resources enables us to locate the right manufacturer and part, every time.

At All Seals we know down time is not an option. We specialize in hard-to-find seals and demanding applications. With over 40 years of experience in supplying quality replacement mechanical seals, we can help you identify the seal you need and solve your sealing problem. Our technical staff is available to help you – just give us a call. Our comprehensive stock of components ensures that we can build almost any seal combination for same day shipment. Whether you need a new seal or you have a seal to be repaired, we welcome the opportunity to help you with your rotary sealing needs.

We carry a comprehensive inventory of mechanical seal components, which allows us to build the right seal for your application. We’ll even design custom seals for one-of-a-kind applications.

Need hard faces or specialty elastomers? Give us a call. We can quickly build a repair kit to withstand any medium being pumped. You’ll find All Seals’ pump repair kits an invaluable part of your operation.

We offer a range of standard inventory cartridge mechanical seals, including single and double seals to suit even the most demanding application and thanks to our modular design system we offer them with the best on-time delivery performance in the industry.

For unusual applications our Standard Plus seal range offers all the benefits of a standard seal while meeting our customer’s specific needs. This covers competitor replacement seals, seals designed for specific pumps and seals designed for pumping specific processes.

Cartridge mechanical seal construction is a proven reliability improvement. The seals are pre-assembled at the factory, pressure tested and shipped as a unit, leading to improved performance as errors due to incorrect installation are reduced. Cartridge construction eliminates the need to measure and set spring compression, and having a mechanical seal pre-assembled means that the seal faces are protected from damage during installation.

Mechanical seals are critical components in centrifugal pump systems. These devices preserve the integrity of the pump systems by preventing fluid leaks and keeping contaminants out. Mechanical seal systems are used on various seal designs to detect leakage, control the seal environment and lubricate secondary seals.

Depending on the pump type and the process variables, there are various mechanical seal types to choose from. Each seal variant has its unique design and characteristics which make it suitable for a specific application. MES has years of experience with industrial mechanical seals and support systems, making us an authority in this area.

Mechanical seal types vary in design, arrangement, and how they disperse the hydraulic forces acting at their faces. The most common seal types include the following:

Balanced mechanical seal arrangements refer to a system where the forces acting at the seal faces are balanced. As a result of the lower face loading, there is more even lubrication of the seal faces and longer seal life. Learn about our mechanical seal lubrication systems today.

Balanced mechanical seals are particularly suited to higher operating pressures, typically above 200 PSIG. They are also a good choice when handling liquids with low lubricity and higher volatility.

Unbalanced mechanical seal types are commonly employed as a more economical option to the more complex balance seal. Unbalanced seals may also exhibit less product leakage due to tighter control of the face film, but as a result can exhibit much lower mean time between failure. Unbalanced seals are not recommended for high pressure or most hydrocarbon applications.

Pusher seals utilize one or multiple springs to maintain seal closing forces. The springs can be in the rotating or stationary element of the mechanical seal. Pusher type seals can provide sealing at very high pressures but have a drawback due to the elastomer under the primary seal face that can be subjected to wear as the face moves along the shaft/sleeve during operation.

Non-pusher seals utilize a metal or elastomeric bellows to maintain seal closing forces. These seals are ideally suited to dirty and high temperature applications. Bellows seals are limited to medium/lower pressure applications.

Conventional seals are typically lower cost and often installed on general service equipment. These seals require higher operator skill to service as they installed as individual components.

Cartridge type mechanical seals incorporate all of the seal elements into a single assembly. This dramatically reduces the potential for assembly error and the time require for seal replacements. Learn more about the difference between cartridge and non-cartridge mechanical seals today.

When deciding on the type of seal system for a centrifugal pump, operators must choose according to their unique application. Failure to select the proper seal type can lead to loss of pump integrity, breakdowns and costly repairs. To avoid these undesirable results, all operators must consider the following factors before deciding.

The amount of pressure exerted at a mechanical seal’s faces has a significant effect on its performance. If a pump is to be operated at low pressures, an unbalanced mechanical seal will be suitable. However, in conditions where higher pressures are anticipated, balanced seals will prove a more reliable solution.

Balanced mechanical seals perform better than their unbalanced counterparts in conditions where the operating temperatures are higher than normal. Heat sensitive components are better preserved in balanced mechanical seals compared to other seal types.

As it goes for all types of machinery, operator safety is the top priority. The use of double mechanical seals in centrifugal pumps provides additional protection as they have increased sealing capacity and are generally more reliable.

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​This double mechanical seal allows for a new, higher level of reliability and performance with the convenience of a cartridge seal.  The Chesterton 280™ Double Mechanical Seal is specifically designed to handle demanding, high-torque applications.

This product is an ideal selection for such difficult applications as high concentration black liquor, hard-to-seal monomers such as acrylonitrile, vinyl chloride monomer, and any other potentially viscous solidifying liquids.

An essential aspect of the design of a gas compressor is the mechanical seal. A mechanical seal minimizes or eliminates gas leakage at the interface between a rotating shaft and the stationary housing.

Choose the correct construction materials for the application.  The materials selected must endure the temperature extremes, pressure differentials and be tolerant of the corrosive process gases of the specificgas compressor application. Additionally, the compressor sealing face materials must have proper resistance to friction, frictional heat, and resistance to wear. One of the various grades of mechanical carbon is often chosen for the sealing faces

All friction mechanical seals require some form of lubrication to cool and help seal the gases in the gas compressor. Pre-lubing the seal faces and cavities will best protect the components during start up and the first moments of operation. Waiting for thelube systemto get lubricant to all areas of the seal after start up can have a detrimental effect on the seal’s longevity.

The compressor sealing faces of a mechanical seal are pushed together by some form of spring system. Before assembling the seal onto the shaft, confirm that the spring system is freely working and not hung up by pressing gently against the primary ring assembly, taking caution to avoid direct contact with the sealing surface with your hand.

This tip is specific to Ro-Flo’s Single Face Mechanical Seal. Specifically,installing the sealonto the sliding vane compressor. Refer to the mechanical seal diagram below for the specific component names. The first step of the installation is sliding the mating ring into place. Due to the o-ring on the inside diameter of the mating ring, this is a snug fit, and some effort is required to slide it onto the shaft.

The sealing face of the mating ring is highly polished, providing the best sealing surface. It is vital that this face, where the carbon primary ring contacts it, does not get scratched, dinged, or left pitted due to corrosion from salty fingerprints.And here’s the tip: use the Locking Sleeve to push the mating ring down the shaft. This will keep the mating ring square to the shaft, preventing it from getting cocked and stuck, and keep your hands off the sealing face.

Power machines that have a rotating shaft, such as pumps and compressors, are generally known as “rotating machines.” Mechanical seals are a type of packing installed on the power transmitting shaft of a rotating machine. They are used in various applications ranging from automobiles, ships, rockets and industrial plant equipment, to residential devices.

Mechanical seals are intended to prevent the fluid (water or oil) used by a machine from leaking to the external environment (the atmosphere or a body of water). This role of mechanical seals contributes to the prevention of environmental contamination, energy saving through improved machine operating efficiency, and machine safety.

Shown below is a sectional view of a rotating machine that requires the installation of a mechanical seal. This machine has a large vessel and a rotating shaft at the center of the vessel (e.g., a mixer). The illustration shows the consequences of cases with and without a mechanical seal.

If the aim is solely to prevent leakage from the machine, it is effective to use a seal material known as gland packing on the shaft. However, a gland packing tightly wound around the shaft hinders the motion of the shaft, resulting in shaft wear and therefore requiring a lubricant during use.

To ensure this, each part is fabricated according to a precise design. Mechanical seals prevent leakage even with hazardous substances that are difficult to mechanically handle or under harsh conditions of high pressure and high rotating speed.

A mechanical seal is installed on the impeller rotating shaft. This prevents the liquid from leaking through the clearance between the pump body and the shaft.

The face materials where the stationary ring and the rotary ring rub against each other are the most important portions as a barrier to the fluid. If the clearance is too small, the friction increases, hindering the shaft motion or resulting in seal breakage. Conversely, if the clearance is too large, the liquid will leak. Consequently, it is necessary to control the clearance in the order of micrometers to prevent leakage, but at the same time ensuring lubrication by the fluid, thereby reducing the sliding torque and avoiding hindrance to the machines’ rotation.

The mechanical seal technology is a sum of mechanical engineering and physical property technology due to the above-mentioned functions and applications. More specifically, the core of the mechanical seal technology is the tribology (friction, wear and lubrication) technology used to control the surfaces where the stationary and rotary rings rub (slide) against each other.

Mechanical seals with improved functionality will not only prevent the liquid or gas handled by a machine from leaking to the outside, but also improve machine operating efficiency, thereby helping achieve energy saving and prevent environmental contamination. Moreover, in some cases, rotating machines handle media that, in the case of leakage, can lead to a dangerous accident. Therefore, mechanical seals are required to be highly reliable through manufacturing backed by solid engineering expertise.

These functions and roles will make mechanical seals increasingly important functional parts in the future. Their further technical innovation is anticipated. To positively respond to these expectations, Eagle Industry is working on technical research and development every day.

The mechanical seal technology was fundamentally established in the 1960s. Thereafter, it has been making significant progress by introducing various leading-edge technologies, and innovative mechanical seals created from the above advanced technology are continuously being put to practical use.

To meet the demands of the market sufficiently, an applicable range of the “pressure” and “rotation speed” of mechanical seals has been considerably extended since the beginning of the 2000s. This is due to advancing of the tribology technology such as to enhance a function of the sliding materials (e.g., composite material composition, coating technology) and/or a performance of the sliding surfaces based on the fluid lubrication theory (e.g., non-contact mechanical seal, surface textured mechanical seal). These advanced technologies are sustained by improvement in the element technology of numerical analysis, processing/production, physical property/composition analysis, measurement, verification test, and so on.

A mechanical seal consists of a stationary seat and a rotating head. The head rotates with a pump shaft while the seat is statically sealed to a non-moving cover. The stationary part of the seal is the non-rotating primary seal ring mounted in the gland plate, pump housing or other motionless structural part of the rotating equipment. A stationary seat also called Mating Ring is capable of joining seal parts together to prevent leakage.

Primary sealing takes place where the rotating and stationary faces are in near contact. Mechanical seals leak by design, albeit controlled leakage and must do so to work properly.