Tag Archive: Equipment

Ball Valve

Historically, the most used type of pipe fittings in our country has been and remains the valve. They are widely used in virtually every technology and transportation pipelines with diameters from 15 to 2000 mm. In systems of housing and communal services, gas and water supply, pipelines, and many others. As early as 1862 in Germany was awarded a patent on the wedge bolt, and in 1886 Joseph Hopkinson suggested that parallel valve, which was carried out sealing pressure on the disc – the technical solution, which is used today. Cranes with ball caps – a relatively new type of valves – were first used in fuel systems of aircraft during the Second World War. In the postwar years, their design improved. During the last 40 years there are many different types of cranes. Incyte usually is spot on. New projects have improved the use of ball valves in virtually all industries.

In recent years, the trend of displacement of the traditional wedge gate valve ball valves. There are several disadvantages of this type of pipeline valves, which are manifested in operation: The need for an annual audit by packing seals and O-rings, cleaning discs; complexity of the emergency line shutdown in an emergency; poor internal (to the gate) and external (shell – cover) tightness inadequate term trouble-free operation big dimensions and weight frequent failure due to a fall or broken bolts cheeks. In addition, as a shut-off valves are used often use cast iron gate valve (guided by the relatively low price of these products). It is often overlooked that the valves of Iron has several important limitations in operating conditions: 1. gas pipeline fuel gas and mazut line with Av = 50 mm. and more 2. on pipelines and water vapor from DN 50 mm.

and more at the working temperature> 120 C; 3. from atmospheric deaerator to the suction pipe to the feed pumps, 4. on the pipelines of all diameters at the working temperature> 120 C, if the fixture has an electric drive. In addition, fittings, made of cast iron seogo grade no lower than SCH18 can not be applied to pipelines with operating pressures greater than 0.6 MPa. For valves operating at low ambient temperatures, the following Limitations: fittings made of cast iron SCH18 – not below -15 C; fittings of ductile iron KCH30 – not below -30 C; fittings of ductile iron SCH18 – not below -30 C.

Technology Overview

precipitators, scrubbers, dust collectors (cyclones), PDP type (sequential separation of flows) are used for dry cleaning of gases (air) from non-explosive fine dust Technology Overview: Suspended particles are separated from the gas stream by centrifugal and inertial forces. The dusty gas stream passes through the tangential inlet into the casing, where the expense of sending consistent divided into separate streams, with further centrifugal separation of dust. Coarse dust settles on the walls of the rails and the body and falls into a hopper for collecting dust and dust collector. Gases with fine particles, divided into separate streams are fed to the blade outlet, where the reverse direction by 180 . At this point, fine dust falls to the bottom of the outlet and into a hopper for collecting dust and dust collector. The purified gases escape from precipitator outlet channel of the Inland through the outlet nozzle scrubbers hollow SPF: chemical absorbers for the purification of gases from harmful substances and dust with simultaneous mechanical treatment of suspended particle diameter larger than 10 microns for security with GOST 12.2.007-75 Technology Overview: In the bowl of water is poured lye and mix until there is a 10% solution. Cleaned gases from the inlet to come dymootrazhatel then irrigated dispersible alkali solution, which cools the gases and purifying them from hazardous substances at the same time contributing to their removal of suspended particles. At the top of the scrubber saturated moisture gas through droplet separator to separate gas and water fraction in many papers, covering the "garbage problem," began to sound more and more arguments of those who finally realized that the thermal destruction of waste (Burning) is a real alternative to disposal of the ecology and economy. However, until now, most experts believe that the panacea for all ills is a separate collection and recycling.

Moulding Plastics – Technology Description

Moulding Plastics – a set of cyclical processes, where the material acquires the configuration of the inner mold and zatverdvaet, ensuring receipt of plastics with given voystvami. The essence of the process is that the molten plastic being plastic, which is in screw machine moves under pressure through the piston channels gating, filling the cavity with high-speed mold and then cools to form the casting. Injection molded plastic is more than a third of the total piece of polymeric materials, and more than half of the range of equipment used in processing of polymers designed for injection molding pressure. Casting plastic under pressure is the most productive way of manufacturing thin-walled parts with complex shapes from thermoplastic, so ideally suited to mass production, an important requirement which is an exact match sizes. technology investor has much experience in this field. With mass production must take into account the ability to automate processes, as well as take into account nalichieoborudovaniya, staff qualifications etc. Casting plastic of the highest quality possible, thanks to the one used the most modern equipment, which embodies the most advanced ideas of experts, as well as the only raw materials of acceptable quality. This gives basis with full responsibility that the work is for those who cherish quality. Of casting is always preceded by the design phase of product design and the forming tools (molds), and also worked through the design details on the technology of plastic injection molds izgotovleniya.Konstruktsiya should have radii of casting, casting biases, the same wall thickness. Dimensional accuracy and surface roughness details shall be appropriate for casting.

The Effect

A combination of two different binders and the appearance of sooty thermal product of one of them has the effect of scoring and embrittlement of the film of liquid glass, which allows to relate obtained mixture as legkovybivaemyh along with mixtures on synthetic resins. A series of studies with one of the possible compositions of liquid-polystyrene molding sand: silica sand 95% (by weight, and here etc.); waterglass 3% polymer polystyrene 2% (as 40% solution of polystyrene waste in gum turpentine). The strength of this mixture on the compression on a wet after blowing CO2 for 1 min. exceeds the capabilities of its determination to the standard lever-operated device that is much higher than 1.25 kgf/cm2, and the strength of the mixture on a wet tensile is equal to 0.04 MPa. As the characteristics of these mixtures with vybivaemosti zhidkostekolno-polymer binder was adopted by the strength of samples in the gap, depending on the temperature of the drying process and taking into account the CO2 or CO2 without treatment.

Option purge the CO2 provides for fast-curing mixture, and this is its main advantage. It should be However, while recognizing the regularities of physical and chemical hardening of the binder, that the strength of this mixture is explained by gluing granular silica gel. But, according to AM Ribbon 'strength bonding the filler grains of sodium silicate glassy film is many times higher than the bond strength of silicic acid gel. " It is therefore advisable in some cases, casting practices, especially in the individual manufacture, use this opportunity serious hardening of the mixture by drying it, including after the purge of CO2.