balanced mechanical seal factory

Optimal performance is attained by selecting from three standard seal face balances; the BXQ seal is high balanced for flashing hydrocarbon applications

• Drive mechanisms external to the product;• Seal faces positioned for maximum protection;• A dynamic elastomer moves on a non-metallic surface, eliminating fretting defects;• Hydraulically balanced;• ...

Cartridge seals for critical, toxic and emission control applications, where single seals are notaccepted;• Built-in pumping device improves barrier fl uid cooling;• Springs locations prevents contact ...

... corrosion;• Monolithic rotating unit virtually eliminates clogging in the seal area;• A dynamic elastomer moves on a non-metallic surface, eliminating fretting defects;• Hydraulically balanced;• Cartridge ...

Single mechanical seal, balanced, independent of the direction of rotation with multi-spring configuration. The MTM180 Series represents the mechanical seal ...

Single mechanical seal, balanced, external, independent of the direction of rotation with multi-spring configuration. The MTM190 Series represents the mechanical seal ...

Single echanical seal, balanced, independent of the direction of rotation with multi-spring configuration. The springs are never in contact with the fluid. The MTM190 Series represents the mechanical ...

... dual unpressurized arrangement, without outboard seals also incorporating the same non-pusher technology, the seal can be configured to suit both the operator and pipeline needs.

Flexible seal, suitable for the narrower seal housing and suitingcommon European seal housing standards. STK A1 has a longworking length and is fitted with a seal head ...

we are engaged in offering an assortment of Multi Spring Reverse Balanced Mechanical Seals. The offered range find its applications in various industries such as chemical, refinery, petrochemical and pharmaceutical. These seal can be easily assemble or dismantled through cir-clip provided and can be change to balance version.Witch can be provided with single, double or tandem arrangement with external seal support system & devices.

"Multiple spring Revesed Balance Mechanical Seals" are externally mounted internally balanced multiple spring seals. the unique feature of this type of seals is that, it eleminated the shaft step or sleeves for balancing. these seals are externally mounted and hence the metal parts including the spring do not come in contact with the surculating media and therefor can be used for corrosive or abrasive media sealing. the compact design eleminates the requirement of extra radial and axial space for its installation.

Ashish Seals is one the of the major Reverse Balanced Mechanical Seal manufacturers, suppliers and exporters in Mumbai India. We are ISO 9001-2015 certified reliable manufacturer of Reverse Balanced Mechanical Seals that is designed to handle abrasive or corrosive media. As the metal components of this kind of seal do not come in contact with the media to be sealed, it is widely in demand. The offered mechanical seal is compact in design; hence neither axial nor radial extra space is essential for its installation. Such seals are used to handle hydrocarbons, corrosive chemicals, general & light chemicals.

Reverse Balanced Mechanical Seal is externally mounted and are multi coil spring seals. Liquid pressure is used for closing the seal faces. Thus, it is very useful in vacuum and high pressure applications. As it eliminates the shaft step or sleeves for balancing, this makes it a unique seal. It can be exceptionally useful light corrosive and contaminated liquid. The metal does not come in contact with the media. Such seals eliminate the elastomer’s movement. Hence it reduces fretting effect on shaft efficiency.

We are well known as a reliable Single Spring Seal Manufacturers and Exporters. Our Seals are produced using superb crude material that guarantees fantastic toughness.With our experts, we provide clients a high quality Single Coil Spring Balanced Seal which are obtained by basically changing the carbon face assembled through circlip provided. These balanced seals are manufactured as for ‘O’ Ring & PTFE wedge type Secondary Seals. The offered Single Coil Spring Balanced Seal are appreciated for its premium quality, high efficiency and durability. We are giving these spring balanced seals at industry leading rates within stipulated periods of time.

Stationary balanced mechanical seals are currently regarded as the most reliable mechanical seal designs on the market. They impress with low face friction, low wear - and a correspondingly optimised service life. In a stationary design the spring elements are located in the stationary part of the mechanical seal system. The manufacturing tolerances of the various components are thus compensated in one go. No additional vibrations are generated in operation and there is thus less wear.

Mechanical seals have classified several types. In this article, we will see the basic classification of mechanical seal that is the “Mechanical Seal – Balanced and Unbalanced Type”.

The pressure in any stuffing box acts equally in all directions and forces the primary ring against the mating ring. The force (F) acts only on the diameter (Do) across the seal face, it acts as a closing force on the seal faces.

To relieve the force at the seal faces, the diameter of the shoulder on a sleeve or the seal hardware is decreased. Thereby the seal face pressure can be lowered. This is called seal balancing.

A seal without a shoulder in the design is an unbalanced seal. A balanced seal is designed to operate with a shoulder. Only metal bellows seal is a balanced seal that does not require a shoulder.

Virtually all mechanical seals are available in either unbalanced ( Ref. Figure) or balanced versions. The term “unbalanced” is used when the stuffing box pressure times the area exposed to the pumped fluid (closing force), acting to close the seal faces, is greater than the average pressure between the seal faces (pressure gradient)times the area of contact between the faces. In other words, unbalanced mechanical seal exhibit net hydraulic closing forces which are generated by the actual pressures to be sealed.

For example, if there were a stuffing box pressure of  50 psig (3.4barg), the spring load would have to be added. Hence, the “face load” or closing force on the faces would be even higher than 50 psig times the face area. This, of course, limits the pressure sealing capacity of an unbalanced seal.

Unbalanced seals are often more stable than balanced seals when subjected to vibration, misalignment and cavitation. The disadvantage is their relatively low-pressure limit. If the closing force exerted on the seal faces exceeds the pressure limit, the lubricating film between the faces is squeezed out and the highly loaded dry running seal fails.

The balanced seal has the same opening (face) area as the unbalanced seal, but the closing area has been reduced about the face area. Because force equals pressure times area, reducing the closing area reduces the closing force. Consequently, less heat is generated and the seal generally has a longer life.

To simplify the explanation, balancing mechanical seal involves a small design change which reduces the hydraulic forces acting to close the seal faces. Balanced seals have higher pressure limits, lower seal face loading, and generate less heat. They are better able to handle liquids with low lubricity and high vapour pressures. This would include light hydrocarbons. Because seal designs vary from manufacturer to manufacturer and from application to application, it is not possible to standardize on either configurations or materials that cover all conceivable services. Available basic designs have variations that were often developed to meet specific applications. Each seal design has its own strengths and weaknesses.

Nowadays most of the seal manufactures are used only balanced mechanical seal. In some special mechanical seals (ie., engineered seals) are designed with unbalanced mechanical seal.

Balanced mechanical seals are more preferred than unbalanced mechanical seals. Seal balance can range from 0.65 to 1.35, depending on operating conditions.

A. A balanced seal is a mechanical seal configuration in which the fluid closing forces on the seal faces have been modified through seal design. Seal balance, or balance ratio of a mechanical seal, is simply the ratio of two geometric areas. These areas are called the closing area (Ac) and the opening area (Ao). The closing area is different when pressure is on the outer diameter of the seal than when the pressure is on the inner diameter. When the pressure is on the outer diameter, the closing area is from the seal face outer diameter down to the lowest point, where the secondary seal rests against the shaft or sleeve. When the pressure is on the inner diameter, the closing area is from the highest point, where the secondary seal rests against the primary ring counter bore, down to the sleeve diameter.

The opening force is always the area of the sealing faces. The balance ratio is then Ac/Ao. A seal with a balance ratio less than 100 percent is called a balanced seal. A seal with a balance ratio greater than 100 percent is called an unbalanced seal. Most balanced seals have a balance ratio between 60 and 90 percent. Most unbalanced seals have a balance ratio between 110 and 160 percent.

Pusher seals normally require a step in the shaft/sleeve or internal hardware to achieve a balanced design. Metal bellows seals do not require this step. The balance diameter, or mean effective diameter (MED), of metal bellows seals is located near the middle of the convolution. When pressure is applied to the outer diameter of the seal, the MED shifts downward, lowering seal balance. The opposite is true when the seal is subject to internal pressure. The rate of change in the balance depends on the face width and the bellows leaflet design.

Pusher seals can be designed to withstand pressure from either direction. This is accomplished by trapping the O-ring between two diameters as shown in Figure 4.1. The cavity must be long enough to allow the O-ring to move, allowing pressure to act on the primary ring. These designs allow the seal to withstand system upsets.

Type MI250C is a multiple spring high-performance seal specially developed for Slurry application. The springs are protected from the Media by means of dynamic ‘O’ Ring. Although being a balanced seal it doesn’t require step on Sleeve. The Sleeve of the unbalance Seal can be used for this seal series without modification. Torque transmission to the seal ring is given by strong multiple drive Pins/Lugs. This seal can be run against many different stationary seal rings for maximum flexibility in many applications. This seal has a balanced O-Ring design with anti-clog features, springs out of the fluid and dynamic O-Ring moves on a clean surface. The concept is ideal for stock realization. This seal are factory assembled and dynamically tested.

Multi Spring Unbalanced Seal are designed as its name express, the number of spring in its peripheral. Due to very evenly spread of spring compression on the face of mechanical seal, the load will act very much even throughout the size of seal, which will lead very less wear, and help for higher life.

Because of the even load and compactness of springs, the seal can be run up to 6000rpm. However the seal will easily disturb even with very small longitudinal movement of a shaft.

The springs are very small in construction, the pumping medium should be very clear and pure, or else the springs will clog easily which will spoil the life of the seal.

Reverse balanced mechanical Seal which is called shortly RB seals are assembled outside of the pressurised area. Because of less contact of pumping medium on the face of the seal, the rpm of the shaft should be very less enable to reduce the face friction temperature. Due to these drawbacks, we can use these types of seals only in agitator/mixture/blender machine shafts with low rpm from 1rpm to 800rpm. In some special cases, we can use the same seal at higher rpm with the support of external coolant.

The Type RT-S64 is Balance Cartridge Mechanical having preassembled cartridge integral sleeve and gland plate. Balance Cartridge Mechanical seal is hydraulically balanced seal-face technology for reduced power consumption and heat generation enhancing seal life. It’s a non-contact type design where spring is prevented from clogging and corrosion. Multiple spring with rotating style and wave spring with demand by customer. Pressurized buffer fluid can be applied.

We also manufacture and supply Single Cartridge Mechanical Seals, Double Cartridge Mechanical Seals and High Pressure & Speed Balance as being top most mechanical seal manufacturers in Mumbai as well as known as one of the most precise mechanical seal manufacturing companies in India.

The Type RT-50B is Reverse Balance Mechanical Seals. It is multiple springs externally mounted reverse balanced seal with O-ring as secondary sealing member. This seal can also be used for corrosive services as the metallic components do not come in contact with liquid to be sealed. This seal can also install indouble back to back arrangement as an internal seal. Sealing member can also be changed as per chemical compatibility. All metal components including spring are isolated from aggressive media Sealing. Even if barrier fluid pressure goes down this seal will not allow process fluid to mix with barrier fluid.

We also manufacture and supply Single Spring Mechanical Seals, Multi Spring Mechanical Seals, Teflon Bellow Seals, Elastomer Bellow Mechanical Seals, and Metal Bellow Seals as being top most mechanical seal manufacturers in Mumbai as well as known as one of the most precise mechanical seal manufacturing companies in India.

The balance of a seal refers to the distribution of load across the seal faces. If there is too much load on the seal faces, it can lead to a leakage of fluids from within the seal which essentially renders the seal useless. Moreover, the liquid film in between the seal rings runs the risk of vaporising.

This can result in higher wear and tear off the seal, shortening its life span. Seal balancing is therefore necessary to avoid disasters and to also elongate the life of a seal.

A balanced seal has a higher pressure limit. This means that they have a larger capacity for pressure and they also produce less heat. They can handle liquids that have a low lubricity better than unbalanced seals.

On the other hand, unbalanced seals are typically much more stable than their balanced counterparts as far as vibration, cavitation and misalignment are concerned.

The only major drawback that an unbalanced seal presents is a low pressure limit. If they are put under even slightly more pressure than they can take, the liquid film will quickly vaporise and will cause the running seal to run dry and thus fail.