No matter how complex the hydraulic system, it always consists of various hydraulic units, interconnected pipeline systems. The quality of the data pipeline systems typically have been under stringent requirements, because of their reliability depends not only duration and reliability of hydraulic equipment, but also the stability of the entire hydraulic system. Important These components are the various piping systems weld and threaded pipe joints, which are mounted hydraulic and lubricating fluid system. These compounds are conventionally divided into two groups: terminal and loop-through. First serve for mounting on the ends of the pipe and connected to all kinds of pumps, blocks, hydraulic cylinders, etc.

The latter are mounted along the length of the pipeline and used to interconnect separate sites in the overall hydraulic system. Limit connections to complete cut-metal rings provide quick and reliable installation of pipelines using calibrated (Precision) of pipes. Due to strain a relatively soft material of the pipe with the introduction of a sharp edge cutting ring that runs from a much more durable material, sealing is achieved connection with hose pipes. In these compounds without reassembling the tie-rings and replace the pipe end preparation – is unacceptable. Typically, end-complete connection consists of cutting ring, the terminal fitting (or gon) and cap nut. Corner joints can be used to connect pipes with weld nipples, and in this case, locks the ring does not apply. The most commonly used reference materials are carbon steel, brass and stainless steel alloy. The standard is the use of ordinary carbon steel.

In this case, and end fittings, and coupling nuts have a special plating (Usually zinc or yellow chromate). It is worth noting that the most widely used in Russia and Europe have connections with metric threads and sealing cone 24 . Depending on the job Pressure connections are divided into groups: ultra-light, light and heavy. Properly chosen, taking into account the specifics of a particular hydraulic system, used for repairs, will minimize the risk of downtime and breakdowns hydraulic equipment, as well as significantly increase the safety of staff.


GPI Series oils are designed specifically for hydraulic drives on the experience of firms, "VAZ" and "Fiat" and contain additives to improve performance. Industrial oils with high impurities are recommended only for irresponsible systems. Therefore, any oil must be filtered with a subtlety not worse than 25 microns, oil cleanliness class – no coarser than 12 and even 13 under GOST 17216-71. Keep it should be in closed containers and carefully protected from being hit by dust, moisture and pollutants (especially abrasive or solid particles and objects that could clog the valves and oil lines). At a temperature of -10 …- 15 C should be more viscous oil (AND 20 AND 20A, MGE, etc.) at low temperatures down to -40 C – less viscous (EL, q VMGZ etc.). Recommended grade oils are listed in the technical documentation MPI. The use of other brands of oil should be coordinated with the manufacturer. It should be keep in mind that here and below are the usual (old) designations brands of oils.

According to GOST 17479.3-85 new designation for hydraulic oil, used as working fluids for hydraulic systems of machines was cited above in 1.8,10.1 and 11.10. The design of hydraulic MPI includes a number of special assemblies and components (lip seal, seals, rings, valves, pump plunger pairs, etc.), working under great pressure working fluid. Therefore, the reliability of hydraulic machines, the ability to develop large forces at relatively low weight and high efficiency primarily depends on the failsafe of the listed items from their right of assembly and good condition.

Freight Elevator

Elevator – mode of transport, designed for vertical movement of passengers and cargo. A modern passenger elevator can carry up to thirty people, and mine passenger lifts – up to a hundred people. The ordinary elevator moves with a velocity of 0.5 – 4 m / s, while the high-speed elevators can be 17 m / sec. Freight elevator can move up to 10 tons of cargo at speeds up to 1.5 m / sec. Elevators for residential buildings – an obligatory attribute of comfort and convenience, without which is impossible to imagine today's skyscrapers and conventional buildings. Hotyadaleko not everyone knows how and when they were created first lifts. Now we will tell the story.

Scientists believe the advent of the elevator in 1743. It was then in command of the French king Louis XV, who then passed 33 years in the palace at Versailles was built the first lift. The king did not like peretruzhdatsya and climb to the room of his mistress, located above a floor. However, the prototype elevator, familiar to our eyes, was established more than 100 years through the American EG Otis (1811 – 1861.). This man changed my life in a lot of work – worked in construction and mill, digging coach. In 1852, working on furniture factory, manufactures beds, Otis received an unusual assignment – design a hoist to lift the planks on the second floor. In 1853, the inventor discovered light freight elevator with the emergency brake, which breakdowns quickly in case of a rope.