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Dual Plate Check Valve

non slam check valve

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#1 dnrakesh2006

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Posted 17 October 2014 - 04:48 AM

Dear All,

 

we are thinking to select a dual type check valve from a reputed vendor ( and vendor confirmed that this type valve is suitable for compressor application).

 

there is debate going on this issue that dual plat type check valve cant provide a non slam requirement. need to use axial / nozzle type check valve.

 

any body have experience of using dual plate type check valve in compressors. ( our compressor is centrifugal type, service - hydrocarbon gas, flow rate - 4.5 MMSCFD, pressure - 700 psig)

 

Regards

Rakesh



#2 fallah

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Posted 17 October 2014 - 04:56 AM

Rakesh,

 

Please specify the service is clean or may a little bit dirty... It would affect the selection of check valve type for compressor...



#3 dnrakesh2006

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Posted 19 October 2014 - 08:07 PM

Fallah,

 

it is clean gas, compressors are use to produce lift gas at 700 psig for injection.

 

Regards

Rakesh



#4 dnrakesh2006

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Posted 24 October 2014 - 02:30 AM

just checked Nozzle type check valve cost they are too expensive compared to dual plate check valve. is it really worth of selecting Nozzle type check valve against dual plate check valve?

 

Need experts advise .........

 

Regards

Rakesh



#5 RStack

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Posted 04 November 2014 - 05:42 PM

I've used the Duo-check with dual plates since the 70's in gas discharge service.  The similar single plate tilting disc upon occasion. Pay attention to having reasonably well developed flow about the valve.  Pay attention to quality of manufacture; their are lots of knock offs of this design, that leave much to be desired.

 

Also commonly applied to reversing heat exchanger designs for cryogenic plants.

 

Good luck 



#6 dnrakesh2006

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Posted 04 November 2014 - 08:30 PM

Rstack ,

 

Thanks for the input, finally we decided to go for Dual Plate type check valve based on manufacture guarantee. 

 

Regards

Rakesh



#7 Poosticks

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Posted 08 November 2014 - 07:10 PM

A non-slam check valve is usually specified for compressor discharge because it will have very rapid closure times. This will in turn minimise the volume of return flow that would need to be handled by the anti-surge line in the event of a failure. In this way the check valve actually forms an integral part of your anti-surge loop.

 

Dual-plate check valves can and have been used in this service for many years and they will work fine. Manufacturers will often offer a range of spring torques and it is important that a strong torque is selected otherwise the dynamic characteristic of the valve will be lost and you will be left with a poor system.

 

Just to reinforce, a check valve in this application does not simply prevent reverse flow. So using a nozzle valve will allow you to have a much more effective compressor control system.. but a DPCV will work.

 

If you have chosen the dual-plate then I agree with RStack - not all valves are the same. The Duo-Check has a good name, although it has had problems in compression systems. The plates will strike the stop pin on opening - the high acceleration forces encountered at compressor discharge mean the pins can end up getting bent. This issue can be resolved with the long face-to-face option (Crane would probably offer this) to reduce the leverage force (but the result is a more expensive valve).

Goodwin Dual Plates are another good name. They're  valves are specifically designed for compressor service and are available as a wafer option so the cost should be significantly less.

 

I hope this has been useful.






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