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Unloader Pressure


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#1 Pratapsinh

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Posted 28 August 2020 - 09:59 AM

At what pressure we should design finger type valve unloader i.e at suction pressure or at discharge pressure?
If we design it at suction pressure then if our compressor is shut off suddenly at higher pressure in cylinder then how to unload it?

Please help

#2 chetanhm2

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Posted 30 August 2020 - 05:50 AM

Hope this is for reciprocating compressor and service like nitrogen compressor or instrument air compressor here.

#3 chetanhm2

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Posted 30 August 2020 - 05:55 AM

This valve is called blowoff valve or unloader valve .when compressor stops this valve opens and release the pressure and finally suction and discharge pressure is same when compressor unloads

#4 chetanhm2

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Posted 30 August 2020 - 05:56 AM

It should be designed at discharges pressies only

#5 Pratapsinh

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Posted 13 September 2020 - 02:00 PM

It should be designed at discharges pressies only



#6 Pratapsinh

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Posted 13 September 2020 - 02:04 PM

Thanks for your reply

Yes I am talking about reciprocating compressor valve unloaders.

Whether we have to design this finger type unloaders at suction or discharge for capacity control?

Because at suction pressure also it will actuate as cylinders pressure drop to suction pressure during its suction stroke




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