What is reverse balance seal?

Multi Spring Reversed Balance Seals are external mounted multi coil spring Seals. Liquid pressure is used to close the Seal faces therefore very effective in high pressure and vacuum applications. The unique feature of Pusher Type Reversed Balanced Seals is that, it eliminated the shaft step or sleeves for balancing.

What is reverse balanced mechanical seal?

Product Description. Reversed Balanced Pusher seals. Multiple spring Reversed 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.

What is a balance seal?

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).

What is a mechanical seal balance diameter?

For many seals, the balance diameter can be estimated from the shaft size as follows: Classic rotating seal: shaft diameter plus 1/2” to 5/8” Inverted rotating seal (made into stationary seal): shaft diameter plus 5/8” to 1” Stationary seal: shaft diameter plus 5/8” to 1”.

How many types of mechanical seals are there?

8 Types of Component Mechanical Seals.

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What is double mechanical seal?

A double mechanical seal is a type of mechanical seal with two primary seals or sets of faces, it can operate in various arrangements with a) a barrier (containment) between the sets of faces or b) a buffer (mixing).

What is the difference between pusher and non pusher mechanical seal?

Pusher seals utilize a dynamic secondary seal which moves axially with the major seal face. Non-pusher seals have a static secondary seal which stays stationary against the shaft or sleeve.

What is a pusher seal?

A pusher-type seal consists of a primary sealing ring assembled with an 'O' ring and springs which force the sealing liquid across the face and keep it from leaking to the ID side of the seal.

What is a cartridge mechanical seal?

A cartridge mechanical seal is a completely enclosed seal system with preassembled components. Typically, this seal type is composed of a gland, sleeve, and other hardware that make pre-assembly possible.

What is a labyrinth seal used for?

Labyrinth seals are used for many low-pressure air compressors, especially when robustness is more important than low leakage. They are normally made of metal, mainly aluminum, but thermoplastics can be used for higher corrosion resistance or better rubbing behavior.

What are cartridge seals used for?

Cartridge seals are designed for rapid installation on and removal from pump shafts. The cartridge seal is an arrangement of seal components on a shaft sleeve and in a seal gland constituting a single unit that is usually assembled and pre-set at the factory.

What is API plan 11?

API Plan 11 recirculates flow from a high‐pressure section of the pump, typically the discharge piping, through a flow control orifice to the seal. Plan 11 is the default flush plan for most pumps. API Plan 11.

What is a mechanical pusher?

A Mechanical Pusher is an Electro-Mechanical or Hydraulic device which is used for feeding or charging of raw material (like ingots, billets etc) into the reheating furnace.

What is a seal in engineering?

A mechanical seal is a device that helps join systems or mechanisms together by preventing leakage (e.g. in a pumping system), containing pressure, or excluding contamination. The effectiveness of a seal is dependent on adhesion in the case of sealants and compression in the case of gaskets.

What is balance ratio in mechanical seal?

Seal Balance

To reduce the axial face contact force which allows to seal high pressures, i.e. up to 3000 psig with one set of faces. It is the ratio (k) of 2 geometric areas: the closing (Ah) and opening area (Ac) For unbalanced seals k = 1. For balanced seals k = 1.

What is secondary seal?

Definition of 'secondary sealing'

There is primary sealing of the space between the inner wall of the tank and the floating roof, and secondary sealing above the primary seal. Secondary sealing is a system of wiper seals used in floating roof tanks.

What is primary seal and secondary seal?

A double mechanical seal consists of two seals arranged in a series. The inboard, or “primary seal” keeps the product contained within the pump housing. The outboard, or “secondary seal” prevents the flush liquid from leaking into the atmosphere.

What is API plan 52?

API Seal Plan 52 utilizes a reservoir and circulates an unpressurized buffer fluid between the inboard and outboard seals. To provide positive circulation through the support system and into the seal, a pumping ring is employed.

What is API plan 32?

API Plan 32 delivers a clean flush fluid into the seal chamber from an external source. Typically used with a close-clearance throat bushing, this arrangement can be used to ensure a higher pressure in the seal chamber.

What is API plan 23?

API Plan 23 utilizes a circulation device, typically a pumping ring, to route the fluid from the seal chamber through a cooler before returning the cooled fluid to the seal chamber. A throat bushing isolates the cooled seal chamber flush fluid from the hotter pumped liquid.

What is API standard for pumps?

API 610 is the API standard about centrifugal pumps and is primarily intended for use in the petroleum, natural gas and chemical industries. Although the 1st through 7th Editions of API 610 included specifications for mechanical seals, beginning with the 8th Edition, API 610 defers to API 682 for seal specifications.

How do I choose a mechanical seal?

What are mechanical seal components?

Every mechanical seal possesses five basic elements: One ring (usually the seal face) circulating synchronously with the rotating part (shaft) Secondary seal (usually O-ring) between shaft and ring. A stationary ring (usually the stationary seat) arranged in the stationary part (casing)

What is inside mounted seal?

Single seals can be mounted inside the process liquid or outside the process liquid. Inside-mounted seals are sometimes described or even defined as being mounted within the boundaries of the seal chamber. This means that the process fluid is present on the outside diameter of the seal.

What is a taconite seal?

The SKF Taconite Seal consists of two rings (one stationary and one rotating) which form a very narrow labyrinth between the two rings. The rotating labyrinth ring carries a V-ring seal that seals against the stationary labyrinth ring.