back to back mechanical seal pricelist

Robco"s Mechanical Seal Division manufactures, distributes and customizes mechanical seals, as well as being a repair facility for virtually any mechanical seal brand, utilizing the latest technology and state-of-the-art manufacturing equipment. Robco’s seal designs are customer driven to provide the best possible solutions to sealing problems.

Robco will repair: Borg-Warner, Chesterton, John Crane, Durametallic, EG&G, Flex-A-seal, Flexibox, Flowserve, Garlock, Pac-Seal, U.S. Seal, and virtually any other brand.

Mechanical seals are used everywhere liquids and gases are transferred through rotating equipment. Robco’s seals and packing are the first step to efficiently control leakage and reduce operation costs.

The ideal seal for alumina applications, specifically designed to operate in this challenging environment, the Robco DRYTEK seal will provide maintenance-free operation at least five to twenty times longer than your average alumina screw conveyor seal.

•Better abrasion resistance  •Dry-seal, no lubricant required  •Sealing components rotate with the shaft, maintaining an airtight seal  •Adapts to axial and radial movements of the shaft  •Available in C.E.M.A. and METRIC standard shaft sizes.

Double balanced cartridge seal for pumps, agitators and mixers that prevents the leakage of toxic, hazardous, corrosive and costly fluids to the atmosphere.

The value of repairing instead of replacing whenever possible has always been a source of savings and a way to lower the Total Cost of Ownership of your equipment. At Robco, we believe in supplying you with quick, expert service to make your operations as efficient as possible.

Robco uses specialized equipment to ensure that rebuilt seals operate equal to brand new, with mechanical seal manufacturing and rebuilding experience dating back to 1978, servicing petrochemical, pulp & paper, steel, mining, waste water, utilities, boilers and more...

We rebuild all major brands at competitive prices with premium quality parts that meet all OEM specifications. We offer a free estimate and failure analysis. Rebuild outlay normally varies from a third to half the cost of a new seal, so lower your inventory value and reduce your overall operations cost.

By centralizing your repairs: Robco rebuilds all major brands in one location, simply complete our Seal Repair Form to be enclosed along with your seal shipment and we’ll take care of the rest, returning your seal looking and working like new. Robco tags all rebuilt seals for future rebuild identification, tracking seal life and failure patterns.

Not only do we handle all styles of seals and environmental controls, we can also repair, modify and even build what you need when standard products don’t do the job. We repair all brands in-house.

We have developed a very powerful root-cause failure analysis capability to identify what is really going on in your pumps. We “follow the evidence” like CSI. From legitimate and reliable analysis, we can identify the cause or causes of premature failure, recommend the solution and provide it without long lead times or ridiculous prices.

We just don"t know of another company that can do so much for you in the murky world of mechanical seals. With our training programs, we can even make the murkiness go away.

The family of shaft seals known as mechanical seals is the most advanced type of seal used in the mixing industry. They can handle the highest pressures, maintain nearly leak-free operation, and require minimum maintenance if installed and operated properly. The downside is the higher initial cost (both for the seal and for the more complicated equipment required surrounding the seal) and the expertise needed to service the seals. Mechanical seals are increasing in popularity due to the growing environmental restrictions regarding any leakage from process tanks.

There are hundreds of mechanical seal designs, but they all are variations of a basic layout consisting of a collar mounted on the shaft which uses springs to push a ring (which also rotates with the shaft) against another ring that is held stationary. The rings rotate against each other riding on a thin layer of lubricant, and the springs hold them so tightly together that leakage through the seal is reduced to an immeasurable amount. The mating surfaces of the rings must be perfectly flat to seal properly, and are manufactured to tolerance measured “light- bands." The rings must also be extremely hard to endure the pressure and wear, so they are usually made up of ceramic, carbon, silicon carbide, tungsten carbide or similar materials. The stationary “seat” is held in place and maintains a static seal with the mounting housing using gaskets or o-rings. The rotating elements of the seal must attain a static seal with the shaft using o-rings, wedges or packing.

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.

At Gaddis Mechanical Seals, our industry-leading seal repair services allow us to repair or upgrade most mechanical seals. In rare cases, though, the damage to a mechanical seal is too severe to repair. Gaddis Mechanical Seals has replacement seals for over 400 brands of OEM pumps, mixers and grinders. We have the ability to provide these replacement seals at a significant cost savings over OEM seals due to the cross referencing ability of our records that go back almost 40 years and our inside engineers ability to identify the type of seals used in your equipment. Over the years, Gaddis Mechanical Seals has formed close relationships with some of the best mechanical seal providers in the world today. By leveraging these relationships, we are able to pass our sizable savings on to our customers in order to offer the best mechanical seals on the market at the lowest prices you will find.

Our engineers will also work with you to fully understand your specific requirements in order to ensure that we provide the perfect mechanical seal for your needs. If you want to guarantee that you purchase a mechanical seal that will function in the application while also ensuring that you receive the best price on the market today, we at Gaddis Mechanical Seals are able to help.

Having a definite quality administration system, we are providing a comprehensive assortment of Mechanical Seal to our customers. Valued for their perfect finish, sturdy built and longer life; these are hugely commended. Along with this, the offered product is designed by hard-working engineers, who ensure to comply it with the industry laid standards and norms. The offered product is extremely praised by our clients all over the country. Also the customers can avail these at affordable rates from us within the assured time.

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.

In Part 2, we’re taking a closer look at the various rotary and stationary double seal arrangement options (configurations), and how to maximize their success.

A double seal is designed with two primary seals. These seals often use two rotating seal faces and two stationary seal faces. A fluid is provided between these two seals at a lower pressure than the sealed fluid (known as buffer fluid) or at a pressure higher than the sealed fluid (known as barrier fluid). The fluid provided to the dual seal allows the seal to survive in lethal, explosive, carcinogenic, hazardous, adhesive, or extremely viscous fluids.

A conventional double seal can be designed to seal the buffer or barrier fluid on the inside or outside diameter of the seal faces. Typically, the seal designer will place a softer, narrow face against a harder, wide seal face. The design intention is to enable the softer seal face to wear, while keeping the wider hard face from wearing in service. Once the narrow seal face has been worn away, the seal has reached the end of its suitable life.

Each configuration has its own strengths which are addressed below. Ultimately, it’s best to speak with a sealing specialist who can draw on a wealth of direct experience and implement according to your organizations’ expectations for reliability and environmental compliance.

In this double seal configuration, two narrow seal faces are mounted back-to-back (opposing) to one another. This is the original concept of a dual seal —taking two component mechanical seals and placing them ‘back-to-back’ within the stuffing box. This configuration is used in most general applications.

The unbalanced back-to-back mechanical seal requires a barrier fluid pressure of 15 psig higher than the seal chamber pressure. The barrier fluid is being pressurized above the seal chamber pressure, so the outboard seal faces are carrying the greater load and should wear out or fail first. When this happens, the barrier pressure will be lost, causing the inboard faces to open. In other words – if the seal works correctly, both seals will fail at the same time. This is not very good back-up protection.

If this seal is a double balanced design, the fluid between the inboard and outboard seal faces can be higher (barrier) or lower (buffer) pressure than the seal chamber pressure. This means that if the barrier/buffer fluid is lost, both seals will remain closed and operate reliably.

In back-to-back arrangement (both unbalanced and balanced seal designs), the outboard seal faces almost always are rated for a lower pressure than the inboard seal faces. This is because the outboard seal faces are an outside seal configuration and the faces are exposed to tensile force. Ceramics are generally weaker in tension than compression, so their pressure limit is lower.

If the inboard seal fails first, the barrier fluid will leak into the process which will cause product dilution. This product dilution sometimes is not desirable for products that can not tolerate it.

This configuration occurs when two sets of seal rings are identically orientated and mounted in-series. This configuration is often referred to as the “in-series seal face arrangement” or “face-to-back.”  It is commonly used in dual seals.

In this arrangement, the seals position the barrier or buffer pressure on the outside diameter of the outboard face. The pressure acts to compress the outboard seal faces. This allows a higher barrier fluid pressure.

Face-to-face seals can be used when the equipment is space constrained to accommodate a back-to-back or tandem seal arrangements. In this configuration a portion of the seal is mounted in the seal chamber and the remainder is mounted outside of the seal chamber.

For successful seal life and reliability it is very important to have the right seal arrangement along with the right barrier/buffer fluid system. In upcoming blogs, we will discuss various seal environmental control plans available for double seals and how to select the best barrier / buffer fluid for good seal life to achieve maximum reliability.

Antim Parikh is a Special OEM Projects & Applications Support Manager at A.W.CHESTERTON for mechanical seal product line. He manages the group of mechanical seal applications engineers and OEM platform products/projects.

Antim has worked for the A.W. Chesterton Company for the last six years in the Mechanical Seal product line as Lead Applications Engineer. He has provided support to all field salespeople and customers on product recommendation and troubleshooting. He has also conducted numerous mechanical seal training classes for customers and distributor’s specialists to provide assistance to training group.

Antim holds degrees in Master of Science in Mechanical Engineering (Fluid Power) from CT, USA and Bachelor of Science in Mechanical Engineering from India.

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.

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Senaa Engineering conceived its business operation in the year 2004 as a Proprietorship firm in the industry. We are the leading manufacturer, supplier and exporter of variety of Mechanical Seals from Tiruppur, Tamil Nadu (India). Our wide range of products includesSingle Spring Seal, Multi Spring Seal, Bellow Seal, Double Mechanical Seals, Cartridge Seal, Agitator Seal, Split Carbon Seal Rings, Mechanical Seal Spares, Pump Shaft andmany more products in the list. We are highly reputed and well recognized organization of this industry, because we never compromise with the product quality and maintain our commitment with our clients. We have a long list of reputed customers because of our qualitative services and quality standards such as S. P. Apparels Limited, Allwyn ExportersandIndian Stitches Private Limited, Antichem Equipments. We make stringent efforts to continuously improve and upgrade our capabilities to develop top notch quality equipments for foundries.

There is an upside to change from packing to mechanical seals, however not all conditions favor seals, so a good general knowledge about sealing systems is important in the decision process.

The product being pumped enters a centrifugal pump through the suction nozzle at the center of a rotating impeller. As the impeller rotates, its vanes fill with fluid, then force it out to the pump casing (volute) where it exits the pump at the cutwater through the discharge nozzle.

The discharge pressure will force fluid back behind the impeller, where it attempts to exit by way of the rotating pump shaft. Some pump designs by manufacturers attempt to minimize this leakage, but it can not be stopped entirely. Some form of a sealing method must be applied to stop or minimize the leakage.

The greatest benefit of using mechanical seals is the drastic reduction in leakage. That reduction in leakage also has an effect on other things as well. Things like a safer work environment without a wet floor or possible contact with hazardous fluids. Fewer beating failures caused by leaking fluid and no damage from packing to the rotating shaft. The maintenance department also sees savings in time and budget. No more adjusting or replacing packing or sleeve. There also is a large reduction in power consumption versus packing. There is up to 40% reduction in friction loss with seals.

At Priest Electric we have the expertise and technical advice to help you in deciding the best sealing medium and represent some of the best manufacturers in the world.

Many factors come into play when a mechanical seal is installed onto a rotating shaft. A major consideration is the equipment condition, which includes the amount of shaft movement when rotating and/or condition of the stuffing box face. Mechanical seals are designed with assumptions regarding the amount of motion the devices can be expected to withstand and still provide no visible leakage during operation.