3 4 mechanical seal in stock

The Viton/Tungsten Seal Assembly 3/4" shaft works with all our RynoWorx cast iron pumps - both the Launtop and the Honda engines - manufactured since 2017. Read more

The Viton/Tungsten Seal Assembly 3/4" shaft works with all our RynoWorx cast iron pumps - both the Launtop and the Honda engines - manufactured since 2017. Read more

Analog mechanical seals: Flowserve 16, SEALOL 6, US SEAL A, John Crane 6, Burgmann BT-PNT, Vulcan 60/65, Sterling 216/217, Roten 16, AESSEAL B04 / B04U.

Mechanical seal for Wilo pump, K, KM, X, AH, AHP, AH, Calpeda, DAB, Ebara, Grundfos, pump KSB, Allweiler, SALMSON, ACD Cryo, Flygt, IMP Pumps, LOWARA, PENTAX, Foras, Fristam, pump SPERONI, ZENIT, Inoxpa, JL, Johnson pump, KOLMEKS, Pedrollo, SAER, Vulcan, WQ, WQK, pump Tuchenhagen, ALFA LAVAL, Donjoy, Mission Magnum.

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.

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.

The scope of our mechanical seal product range far exceeds any other seal manufacturer. From small elastomer bellows seals used in millions of domestic water pumps to double mechanical seals that ensure maximum sealing safety and large, highly customized dry-running gas seals for mission critical high speed turbo compressors, John Crane has the right product for any application.

The right seal support system is critical for promoting seal reliability. John Crane customizes support systems to meet a variety of seal specifications, contributing to safe, cost-effective, reliable operation and reducing harmful environmental effects. Our support systems comply with constantly changing design codes and standards, and meet the increasingly stringent demands on end users.

Our comprehensive suite of seal face technologies are designed to overcome rigorous sealing challenges, including limited seal face lubrication and severe-service duties that adversely affect reliability, operational costs and seal life. Designed by our engineering experts, John Crane’s face treatment options help your equipment power through low-lubricity and dry-running conditions by using advanced micromachined patterns and features to improve seal face lubrication to optimize the performance of rotating equipment in all process industries

Isomag’s advanced magnetic face technology delivers unparalleled performance. The lapped flat faces create a positive liquid tight seal preventing lubricant leakage and the ingress of contaminants in both static and dynamic conditions on horizontal and vertical equipment alike. By optimizing the magnetic energy loading, Isomag’s are capable of running at shaft speeds well above average (up to 15,000 feet per minute) providing the ability to effectively seal the bearing housings on a wide variety of applications

Do you want to minimize leakage from your pumps in an effective manner? This is a challenge operators and maintenance managers face on a daily basis, which can prove costly. John Crane offers a wide selection of packing materials in compression packing, automatic packing, floating packing, and injectable packing. Learn more about our variety of packing equipped to handle the vast majority of sealing solutions and available for nearly all applications.

Spa pump motor shaft seals – they are meant to keep the water from leaking along the shaft of the pump motor, behind the impeller. When a shaft seal fails, as they do from time to time, you will notice water dripping along the backside of the volute (where the shaft enters the impeller housing), running down and dripping off the bottom of the pump.

A leaking shaft seal can easily be confused with a failed volute (impeller housing) o-ring, or with a leaking union or plumbing fitting on top of the pump. In fact, many leaks around the pump will end up running down – and dripping off the bottom.

STA-RITE 37400-0027S, 37400-0026S, 37407-0009, U109-372SS, U9109-358SS, U109-358SS, U109-372SS,                           SWIMQUIP - 370407-0009, XL, VI,XL,VII Series

To be sure that you have a leaking shaft seal, inspect all areas around the pump closely (with a flash light and reading glasses, if necessary). If you have an open volute (where you can see the motor shaft), a leaking shaft seal will leak where the shaft enters the volute, as shown in the image on the right.

Spa pumps with closed volutes (where you can’t see the motor shaft), will be leaking out of a drain hole, in the bottom of the seal plate, or the point where the motor joins the “wet end” of the spa pump.

Not all spa pumps use the same shaft seal, and seals used for hot tub pumps are usually of a higher grade rubber (Viton or Silicone Carbide), than those used in swimming pool pumps. These materials are more resistant to chemical changes, and if you use a spa ozonator, these materials won’t deteriorate like a shaft seal made with a Buna type synthetic rubber.

The easiest way to order the correct shaft seal, is to order by make and model of the pump. This may not be so clearly marked on many pumps however. If you still have documentation on the spa purchase, an owner’s manual should list the shaft seal, and it’s manufacturer’s part number.

The next easiest way to find out which shaft seal is used on your pump is to remove the pump from beneath the spa (shut off power and water valves first), and disassemble the motor from the wet end, so that the shaft seal can be measured and identified.

Spa shaft sealscome in two pieces, a round ceramic disk, and the other half, with the spring. One piece will be pressed into the seal plate of the pump, and the other half fits onto the impeller. As the two halves of the shaft seal are drawn close together during impeller rotation, the spring is compressed, and a good “seal” is made. The seal doesn’t actually touch the shaft, if it did, it would burn up in just seconds of 3400 RPM of the motor shaft. Nonetheless, you will notice that many shaft seals mention the shaft diameter of the motor that they fit.

Remove both pieces of your shaft seal from the pump. The mating ring may require a small flathead screwdriver to pry it out, as it is pressed into place. Be sure to also remove the rubber mating ring, if present.

The other half of the seal, with the spring, can be worked off gently with your fingers. Once removed, take the diameter and height measurements, as shown left.

The other distinction between shaft seals is the type of head that the “spring half” of the seal is either Type A, or Type B. Most spa pumps with Type B seal heads will be using a #1000 seal, but check the other measurements of the seal to be sure. Another measurement, if you want to be really sure, is to measure the diameter of the shaft. Calipers would be most accurate, or you can use a rigid measuring tape, and eyeball it very closely.

With this information on the shaft seal head type and the diameter measurements, and perhaps the shaft measurement, you can now refer to this handy spa pump shaft seal chart, to confidently figure out the type of replacement shaft seal needed, or the seal number, shown in the left hand column. Most common are theshaft seals#100, 200, 201 and 1000, but your spa pump could use a different one. Measure to be sure, and call us if you have any questions.

NOTE:  The Seal Type numbers in the left column, (i.e. PS-100) are commonly accepted universal seal part numbers, which will correspond in size and type, to the manufacturer’s part number. Again, if you have any questions or concerns with proper shaft seal identification, call us for help.

The biggest mistake people make when installing a new shaft seal is installing the seal or the mating ring upside down. As you remove the two halves of the seal, take note of it’s orientation. If this bit of information is not available, take note of how the seal is packed in the box – usually, this is the correct position. Otherwise, know that the ceramic part of the mating ring is meant to contact the hard plastic side of the seal.

When installing Type B seals into the seal plate, use a bit of silicone around the stainless steel cup as you press fit the seal into the plate. Use a very large socket, or a 1″ PVC coupling as a setting tool, to lightly tamp the seal cup fully in place.

When installing Type A seals over the impeller, put the soft rubber side toward the impeller, and the hard plastic side toward the ceramic face of the mating ring.

After installing both seal halves, thread the impeller back on fully, and reassemble the wet end (with no leftover parts!). Reposition the pump and connect the unions, making sure the o-rings are in place. Reconnect the bonding wire and the power cord. If your pump was mounted onto a skid, or base, resecure the pump to reduce vibration and movement.

This is the most common sized mechanical seal. Fits dozens of brands of pumps. USA made. Not cheap Chinese imports. This is a much higher quality seal than some of the cheaper ones you find online with cheap rubbers and poor carbon faces.

3/4" type 6 premium silicon carbide mechanical seal Silicon Carbide primary ring / Silicon Carbide seat seal surface with Viton elastomers and stainless steel hardware for superior longevity against abrasion, corrosion & chemicals, and dry running - far more resistant to corrosives in the water. Silicon Carbide seat section rubber OD 35.4mm, Spring loaded Silicon Carbide section ID 18.7mm (inner measurement of rubber seal) Silicon Carbide Seat, Silicon Carbide ring, Viton Elastomer, Stainless Steel hardware.