Various Important Valves and its Functions in Electric Screw Air Compressor.

Submitted by prasannas on Sat, 2008-07-12 10:21. mechanical engineering

For the perfect operation of Screw Air Compressor some valves are fitted inside the Compressor Unit.This Valves has to perform different function as per requirment of the Screw compressor.details about various Valves are as below.

01)Minimum Pressure Valve (MPV):-

The function of Minimum Pressure Valve is to maintain Air Pressure of 4 kiligram per centimeter square in the Air-Oil Receiver.It is of extreme importance
that Air Pressure is developed in the Air Receiver as soon as the Compressor is started,since this Air Pressure Circulates the Lubricating Oil to the
Compressor unit through the Oil Cooler,Filters,Strainers etc.

02)Safety Valve:-

The Safety Valve is adjusted to 10% Higher Pressure than the Maximum Unloading Pressure.This can adjusted by tightening the Pressure Transformer,
keeping Delivery Valve open.Start closing the Delivery Valve till Safety Valve Blowing.Note the Air pressure at which Safety valve Blows.

03)Air Discharge Valve:-

This Valve opens when the Air at Discharge Port of Air End is more than Receiver Pressure.This Valve Remains closed during Unloading Condition when
Receiver Pressure is more than Pressure at Discharge Port.

Scavenging Air is absorbed through Intake Valve during Unloading Condition to make up for Air Venting out through Unloader Body.Mixture of Oil and
Scavenging Air is passed through this Valve during Unloading Condition.

04)Oil Check Valve:-

The function of this Valve is to stop the supply of Oil immediately after stopping the Air Compressor.Hence Oil is not accumulated in Air End during next starting.This Valve remains opens when Compressor is running both in Load and unload condition.During Unloading Condition,this Valve opens slightly to supply sufficient Oil to Air End.

05)By Pass Valve:-

This Valve is fitted in Oil Line between Receiver and Oil Cooler.A Thermostat is fitted in By-Pass Valve.When Oil Temperature is less than 80 Degree
Centigrate,Oil Cooler is By-Passed and Oil flows directly from Receiver to Oil Filter.

One Ball Valve is also fitted in Oil Line near By-Pass Valve.If this Valve is closed,Oil will always pass through Oil Cooler.If Thermostat fails to function, the problem can be temporarily solved by closing the Ball Valve.

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