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http://www.morganamt.com.au/products/mechanical-carbon-/seals.htmSeal components

Rings & Compressor Components

Sealing Rings

Carbon sealing rings are used as the wear face of most mechanical seals for the sealing of fluids in all sealing of fluids in all industries.

Applications are:

* Process pumps * Rotary steam joints * Seals for agitators and autoclaves * Chemical pumps * Cold and warm water pumps * Corrosive liquid pumps.

Carbon is well suited to be used as a sealing ring due to having the following properties:

* Very good chemical resistance * Good thermal conductivity * High wear resistance * Good corrosion resistance * Dry running properties * Good frictional properties * Outstanding resistance thermal shock * Low thermal expansion

Due to the need for sealing rings to be impervious the carbon material is impregnated with either resin or various metals. Morgan AM&T should be contacted to ensure the correct grade is used for the application. Seal faces can be supplied unlapped or if required lapped to three helium light bands of flatness.

Carbon seal faces are compatible with a wide range of metallic and ceramic counterfaces including silicon carbide and tungsten carbide.

Compressor Components

For Non-Lubrication or Oil-Free Compressors

Various makes of Non- Lubricated Compressors utilise Piston/Bearing rings and Gland Packings in their mechanics, made from self-lubricating materials such as carbon. Various grades of carbon are available to suit individual applications and great care in selecting the right grade of material is taken.Morgan AM&T can also supply Oil Scraper Rings (Wiper Rings) in bronze, white metal materials as requested for the sealing of oil from the compressor crankcase area.

Area of service for non-lubricated compressors include:

* Oxygen plants where oil use would present a fire and explosion hazard. * Instrument air compressors to prevent oil from clogging air operated control systems * Process air for food industries to avoid oil contamination of food * Breweries for the compression of CO2 and process air * Petroleum refining and processing industries for handling of gases and non-lubricating fluids * Chemical industries to prevent oil contamination of end products * Medical oxygen for hospital use.

http://www.corken.com/reciprocating_compressor_technology

Reciprocating Gas Compressors Explained

Reciprocating compressorspull vapor into a cylinder through a suction valve by drawing back a piston to create a low pressure area in the cylinder. They pressurize the gas by pushing the piston back up into the cylinder to squeeze the gas out through the discharge valve.

A compressor valve consists of four parts: a seat, bumper, disc and spring. The spring rests against a bumper and pushes the disc against the seat. The disc seals off the flow passage through the seat. If more pressure builds up on the seat side than the bumper side, the disc will be forced away from the seat and gas will flow through the valve.

In order for compression to take place, the piston must be sealed against the wall. This seal is made with several piston rings. To avoid contaminating the process gas with lubricating oils, the piston rings must be made of a self- lubricating material. Corkens piston rings are usually made of glass-filled PTFE. Gas pressure in the cylinder is used to press the piston ring against the cylinder wall. Ring expanders are used to push the ring towards the cylinder wall so high pressure gas may flow behind the ring.

Piston rings form a good dynamic seal but they are not tight enough to seal all the pressure and gas inside the cylinder; and additional seal is required to do this. This seal is the piston rod packing. The piston rod and packing is a seal that is located at the bottom of the cylinder. It is composed of several parts, the most important being the self-lubricating PTFE V-rings that slightly seal against the piston rod. A spring is included in the packing assembly which allows a slight amount of float to reduce the friction. The rod packing also seals oil in the crankcase out of the compressor chamber to prevent contamination of the gas.

Depending on the type of gas, there will be one to three sets of packing per piston rod. One set of packing controls leakage and oil contamination of the vapor to a satisfactory level for most commercial LP gas and ammonia applications. When leakage and contamination must be held to an absolute minimum, three sets of packing separated by two distance pieces may be utilized. Corken manufactures vertical and horizontal compressors with single, double and triple packing options.

The crankcase converts rotary motion from the motor to reciprocating motion at the piston. With the exception of the model 91, all of Corkens compressors have an oil pump that pressure lubricates the bearings and wrist pins. The oil pump is a gear type that may be run in either direction. As a result, the Corken compressor may be turned in either direction.

For more information on Corkens reciprocating gas compressors, click on one of the links below.