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What is unloader?
an ubnloader valve release the pressurised air from the compressor building insinde the compressoe, & a secondry valve called check valve ensure that air does not flow out during unloader valve realse the pressure.
Loading unloading valve working of screw compressors?
Pressure regulation is accomplished by the use of free air unloading.The purpose of such control to unload theair compressor.When more air is being compressed than is being consumed.Thus reducing to a minimum the power required to drive the compressor and providing maximum economy during the unloading period.This control was done by manual operated type unloaders such as "M" type or "W" type unloaders.Actually this is old technology and replaced by "Electro-Pneumatic Controls" which is also replaced by "Program Logic Control".Still many companies are using old technology and therefore,I am giving details about "M" Type Unloader. * The operation of the unloader is simple and positive.When the pressure in the airdischarge line from the compressor to the receiver reaches the pressure point at which the unloader is set to operate,as determined by the position of the adjusting screw,the plate valve is forced away from its seat on the unloader body.When this happens,air from the discharge line from the compressor to the receiver passes through the unloader and to the unloading suction valve covers,holding these valves open.Then the compressor operates against the atmosphere pressure only. * When the air pressure in the discharge line from the compressor to the receiver is reduced to the predetermined pressure setting of the unloader as determined by the number of unloader shims,then the compression of the spring,over-comes the pressure of the air in the discharge line from the compressor acting against the plate valve,forcing the valve back against its seat on the unloader body.The air trapped in the unloader piping is then vented out to the atmosphere through the vent hole of unloader. * The pressure at which the unit will unload is determined by the position of the adjusting screw.Turning this screw in,increase the compression pressure on the spring and the unloading pressure of compressor.Turning the screw out,lower the unloading pressure.To decrease the loading-unloading range,add the shims and to increase the range,remove the shims. * The most important care that the unloader should receive is to be kept clean.If the operation of it becomes sluggish,the operator should first make sure that all unloader piping is free from leakages since leakage from these places will affect the operation of the unloader.Also the vent hole in the unloader valve seat is open.The gauze of the air cleaner in the unloader line should be removed and cleaned.If problem is not solved,remove the unloader valve seat and clean.If the cleaning and adjusting fail to make the unloader operate satisfactorily,the valve may require grinding. * Use fine grinding compound for valve seat grinding.The valve is provided with two small holes on the top surface for the insertion of the tool to turn it in grinding.Avoid excess grinding since this may change the point of contact sufficiently to affect operation adversely.Clean out all the compound thoroughly after grinding.
Water pressure washer has not pressure?
If it has no pressure your problem should be on the pump. The three things I'd recommend you to check are: Packings, Unloader and Valve Kit.
Function of the pulmonary valve?
pulmanary valve is ppoop
What is the function of air-starting valve?
is the starting valve
What is function of Throttle Valve?
it is the valve which reduce the pressure.
What is the function of a valve lifter?
The purpse of valve lifters is exactly what it says, to lift the valve.
How is the capacity of a screw compressor controlled?
Capacity control is the process by which the flow of the discharged gas from the compressor is controlled. This can be accomplished by several method. 1. Controlling the speed of the compressor. 2. Controlling the clearance of the compressor. 3. Throttling the suction valve. 4. Suction valve unloader.
What are the main functions of the steam stop valve and safety valve?
The function of steam stop valve to supply steam to steam maniform and the function safety valve to prevent the steam high pressure over.
What is the function of expansion valve?
The function of an expansion valve is to regulate the flow of a substance. One example is a thermal expansion valve which regulates the flow of cooling substances within a device.
What is the function of back pressure valve in Boiler feed pump?
The function of back pressure valve is to prevent back flow to the pump in case there is an obstruction on downstream side of valve.
What is the function of the valve of sphygmomanometer?
The function of air valve of sphygmomanometer is to decrease or increase the airflow into the cuff. It is necessary for an accurate blood pressure.
