I am laying out some additons to a existing Natrural Gas compressor station and I am tight on space. To save space I am trying to put a butterfly valve directly downstream of a wheatly swing check valve. Both valves are 20" ANSI 300#. I am worried that when the butterfly vavle is fully open it will interfere with the operation of the swing check.

Does anyone know if there will be interfereance with these types of valve? OR has anyone seen these types of valves in this combination?

There's mechanical interference, and Dynamic interference.  Downstream of a swing-check the flow distribution is going to be both turbulent and distorted.  It's really going to beat on the butterfly valve.  Even if the pieces do not collide with teach other, I'm thinking this is not a very good application.  It would probably be better, if the butterfly valve is used for on-off, to place the butterfly UPSTREAM of the check valve.  The check valve parts will move AWAY from the butterfly, and the butterfly vane will act as a straightening vane for the check valve when the BFV is in the wide-open position.

If you have a recip type compressor then a swing type check valve is a bad choice because of the pulsations.  A better choice is the piston type like Daniel makes or a nozzle check by Mokveld (spelling ?) as previously suggested.

BTW, I do not think I could sleep at night if I used a butterfly valve for a unit block valve.  My choice would be a ball valve with a backup sealant injection system as this valve absolutely, positively has to shutoff.

You should also take into consideration that the unit piping in a compressor station is normally blown down after a period of time after the unit is shutdown.

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