Check valve type

[ukd]

Hello,

I am using a 8" 1500 # dual plate check valve (designed accordance to API 574) for well stream (2 phase) and the valve vendor dont know the Cv vaue but they come with the bore size of 137 mm.

a) I used HYSYS pipe segment to find the pressure drop and they have 4 check valve types viz swing type,disc type,ball type and lift type.I wonder which type this check valve type comes under?

b) When I calculate the pressure drop across it, Is it correct to use net clearance (bore size) as I think when the valve is 100% open, there will be restriction in the plates?

c) Is there any restriction of the minimum bore ID for the check valves like the requirement of minimum bore ID of the reduced bore valves (API 6D)?

Appreciate to your response!

Regards,
UKD

 

[gerhardl]

Suggestion: there should be absolutely information available from vendor or at least producer! Try to press yourself, or from higher up in your organization! If no result a way out could be to compare with similar, competing valves. (If you want verified info you have to go directly to valves origin!)

 

[stanier]

If the vendor cannot provide this information it is likely the valve is a copy of another brand. I would be very wary about using it. If it is a copy who knows what has not been copied directly.

One of the challenges in industry is the plethora of copies coming out of China. they may be cheap but does not necessarily have the engineering behind the product that was learnt using the product's development.

You could refer to other manufacturers' data to get an idea of the pressure loss. Alternatively consult ARD Thorley's book. Pressure Transients in Fluid Systems. You may find some data in technical papers on the Delft laboratory website.

“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King

http://waterhammer.hopout.com.au/

 

[gerhardl]

Stanier: I agree!

 

[gustorf]

Goodwin UK (The leading manufacturer of dual plate check valves) provide a lot information in their brochure, you may want to look at:

http://www.checkvalves.co.uk/brochure_downloads.html

If you care for pressure loss, try out nozzle check valves as supplied by Goodwin or Noreva.