Machine Parts

How one Operating and Testing the Air compressor Safety Valve? Operating the Air compressor Safety Valve:           Operate the safety valve by unscrewing the cap one or two turns and re-tighten it. Testing the Air compressor Safety Valve: Before removing the valve one must depressurize the compressor Valve can be tested and separate air line. If the valve does not open at the set pressure stamped on the valve, it must be replaced. Caution: No adjustments allowed Never run the compressor without safety valve Must wear goggles Must wear hand gloves

  Test have that under continued full-load conditions, exhaust valves may reach a temperature of 1475 F a cherry red. Valves of large diameter run hotter than smaller ones and the valve temperature increases with engine speed. An increase in the compression ratio as a rule lowers the valve temperature but if the compression is carried too high and detonation sets in, the effects is reversed. It is usually assumed that exhaust valve temperature are highest with retarded ignition and weak mixtures, probably because the exhaust pipe hottest under these conditions, but a larger of number of tests carried out on a particular engine showed that the reverse holds true, the exhaust valve temperature being lower with a weak mixture and retarded ignition. The explanation is that the temperature of the valve depends not only on that of the exhaust gases, but also on the temperature of combustion, which latter is lowered by weaking the mixture and retarding the spark.

The overhead camshaft type valve actuating mechanism is generally preferred over the side camshaft type mainly of it’s because of it’s greater rigidity since the camshaft direct the operates the valve instead of operating through push rod and rocker arm. Due to this the valve is open and closely quicker with decreased vibrations and undesirable oscillation. This means increase of high lift, high acceleration cam profile, the   valve operation in case of overhead camshaft is much more precise and smooth than in case of the side camshaft valve system.   However in case of overhead camshaft with inverted bucker follower, the valve lift is equal to the cam lift, whereas in case of the side camshaft, the cam size has to be relatively larger for the same valve lift, which leads to higher cam to follower velocities and relatives rubbing velocities resulting inside thrust reaction caused by the cam action.

For a fixed   distance contact generally more used helical spring such as contact with cam and contact with tappet. Spring help to balance pressure and also give same pressure all space of valve. Generally it is ground flat shape which is subjects to compressive loads. For removing bending tendency diametrically opposed coils end are set up.  The retention the spring is simple of the design which is set up. In this types of helical spring contain ring split which contains two halves and inner surface contain internal projection, it’s help to set up properly to fit. And Outer surface is tapper which can help to do good job. The spring supported from split ring. Valve spring mainly use for heavy service. The valve spring generally made from high steel wire where material is hard drawn carbon and chrome and vanadium steel mainly use. For fatigue resistant valve spring are often shot penned.

Valves A valve is a device that regulates the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically pipe fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure. Valves are used in a variety of contexts, including industrial, military, commercial, residential, and transport. There are many types of valves such as gate valve, glove valve, angle valve, automatic stop valve, cheek valve, back pressure valve, butterfly valve, diaphragm valve etc. Valve materials: Ø   For larger size cast iron or cast steel or forged steel is used. Ø   For valves seats, discs and spindles brass is used. 1.       Gate valve, Glove valve, Angle valve, Automatic stop valve etc are called normally stop valve because they are used to stop the flow of fluids. 2.       Reducing valve: The funct