My client piping material spec (originated from a PIP spec) calls for the following 30" NPS valve:

Type: .......................... CHECK
Class: ......................... 150
Ends:.......................... RF FLG
Body/Cover:................ CS (ASTM A216-WCB)
Trim: ........................... 13 CR, HARDFACE SEAT, API 600 TRIM #8
Design: ....................... SWING
Cover:......................... BOLTED
Gaskets:..................... API 600
Bolts/Nuts:.................. BOLTS: ASTM A193 GR B7
NUTS: ASTM A194 GR 2H
Installation: ................. HORIZONTAL with COVER UP or VERTICAL with UPWARD FLOW
The standards are:
DESIGN - API 600, as applicable
ENDS - ASME B16.47 SERIES B
RATING - ASME B16.34
TESTING - API 598
DIMENSIONAL - ASME B16.10 for NPS 26 to NPS 36
MFG STD for UNLISTED and LARGER SIZES

This was sent out for RFQ from valve vendors to which at least one of them responded that this would be a very long lead-time for this rating, but suggested replacing the valve with an API 6D valve with peroxide Buna N seals.  I have two questions:
1) Is this valve in fact an oddity given the B16.47 series B ends ? It seems odd b/c all of the PIP check valves over 24" call out series B connections.

2) I have done a bit of research on API 6D valves and it would appear to me that the 6D valves testing is more stringent, comply with B16.10 for FF dimensions, etc...
The Piping is to be done to B31.3 which allows use of unlisted components under 302.2.3 (a),(1,2).  Given these valves typically used in the B31.4 service, does anyone see the reason not to convince my client to change the piping spec?

Oh, Cooling water service for this particular application.

In general Check valves over 24" are a bit of an oddity I would be surprised if you found anybody that stocked them.

as far as "series A" Vs "Series B" when it comes to valves over 24" I would estimate we see about 80% "Series A" to 20% "Series B" Most industries outside of oil use "series A". This is mostly based on gate valves.

looking at my companies sales history the past 15 years we have only sold 30" class 150 swing checks 3 times. one time as weld ends the other 2 were with "Series A" flanges.

We don't carry API 6D valves so I am not as familiar with how they are stocked

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