AS-C379 Double Cartridge Mechanical Seal

This seal is double cartridge mechanical seal to replace SNPCM seal. Dual cassette seals have the advantage of easy installation, easy replacement & easy disassembly.

About Us:

Asinoseal is one of the expert leaders, aiming to become a solution maker instead of only a manufacturer. To better equip types of pumps with our seals, we is always on the way to do OEM design and production, from seal material selection, model selection, drawing design to production. We are broadening our product range from focused products to component seals, seal system and raw materials in order to provide one-stop service. Asinoseal is always concentrated on high-end single and double mechanical seal customization.

Background Knowledge:
How to take relevant structural forms to strengthen lubrication between rotary face and stationary seat of mechanical seal（s）
Selecting appropriate structure for mechanical seals can effectively strengthen lubrication conditions between rotary faces and stationary seats, thereby ensuring stable operation of and prolonging service life of the mechanical seals.

1.End face eccentricity
In general mechanical seals, center of rotary face, center of stationary seat and center line of shaft are all on a straight line. If center of one of friction pairs end faces is offset from center line of shaft by a certain distance , the eccentric ring can continuously bring lubricating fluid to the sliding surface when it rotates.
It should be pointed out that eccentric amount should not be too large, especially for high pressure conditions, for eccentricity will cause uneven pressure on the end face, resulting in uneven wear. For high-speed mechanical seals, it is not advisable to use rotary face as an eccentric ring, otherwise the machine will vibrate due to the imbalance of centrifugal force.

2. engrooving on end face:
It is difficult for high-pressure and high-speed machinery to maintain liquid film between friction surfaces, because liquid film is often destroyed by frictional heat generated by high pressure and high speed. In this case, it is very effective to take form of opening slots to intensify lubrication.Both rotary face and stationary seat can be engrooved, generally on more wear-resistant materials. Rotary face and stationary seat should not be engrooved both as this will reduce lubrication effect.

In order to prevent dirt or wear debris from entering friction surface as much as possible, for outflow type mechanical seal which means the liquid flows in the same direction of centrifugal force, groove should be opened on stationary sea to avoid action of centrifugal force to introduce dirt into friction surface.On the contrary, when liquid flows in direction of reverse centrifugal force (internal flow type mechanical seal), groove should be opened on rotary face, so that centrifugal force will help to throw dirt out of the groove.
The small grooves on friction surface are rectangular, wedge-shaped, or other shapes. The grooves should not be too many or too deep, otherwise the leakage will increase.

3. Hydrostatic lubrication:
The so-called hydrostatic lubrication is to directly introduce pressurized lubricating liquid into the friction surface to play role of lubrication. The lubricating liquid introduced is supplied by a separate liquid source, such as a hydraulic pump, etc. This pressurized lubricant is used to oppose the fluid pressure within the machine, and this form is also commonly referred to as hydrostatic sealing.
For mechanical seal used with gas mediua, measures should be taken to establish gas film lubrication, such as the use of gas static pressure controlled film mechanical seal or solid lubrication, that is, self-lubricating material actuating ring or static ring. As long as the conditions allow, the gas medium conditions should be converted into liquid medium conditions as much as possible, which is convenient for both lubrication and sealing.