API 609 Butterfly Valves

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API 609 Butterfly Valves

Face to Face Dimensions: ANSI B16.10

Flange end Dimension :ANSI B16.5

Butt Welded Dimensions：ANSI B16.25

Design and Manufacture：API 609

Pressure Test：API598

Materials：WCB 、WC6 、WC9 、CF8、 CF8M、 CF3、 CF3M 、CN7M、LC1LC2、LC3、LCB、LCC、Monel、20# Alloys、4A、5A、C95800、C95500, ect.

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API 609 Butterfly Valves – Specifications & Selection Guide

Sedelon API 609 butterfly valves are compact, lightweight quarter-turn shutoff and flow-control valves for low-pressure pipelines. Built to API 609 with ANSI B16.10 face-to-face and ANSI B16.5 flange dimensions, every unit is pressure-tested to API 598 before shipment. Available in wafer and lug body types, NPS 2″–24″, Class 150–300, with carbon steel, stainless steel, low-temperature and special-alloy bodies to match your medium.

Wafer vs Lug – Which Body Type Do You Need?

Both types mount between pipeline flanges, but they differ in how they are retained — this decides whether the valve can stay in the line when one flange is removed.

Feature	Wafer Type	Lug Type
Retention	Sandwiched between two flanges, held by through-bolts	Threaded lugs accept bolts from either side independently
Dead-end service	Not recommended (needs downstream flange to hold it)	Yes — one flange may be removed while valve stays inline
Weight & cost	Lighter, lower cost	Heavier, higher cost
Typical use	General line isolation, HVAC, water, chemical	End-of-line, frequent maintenance, skid-mounted systems

How to Select Your Butterfly Valve

Match the three variables below to the service conditions of your pipeline.

Selection factor	Options & guidance
Pressure class & size	Class 150 covering NPS 2″–24″; Class 300 covering NPS 3″–24″. Confirm both rating and NPS against your line.
Body material	WCB / WC6 / WC9 for general carbon-steel service; CF8 / CF8M / CF3 / CF3M stainless for corrosive media; LCB / LCC for low-temperature; Monel, C95800, C95500 for seawater & special alloys.
Seat material	PTFE / RPTFE for general chemical service; PEEK for higher temperature; Nylon-filled for abrasive slurries; STELLITE metal seat for high-temperature or erosive duty.
Trim (API Trim No.)	Disc, stem and seat-ring material per API Trim table (e.g. 10 = 316SS, 31/32 = STELLITE, 53/54/57 = PEEK). Specify trim No. directly in the order.

Application

Face to Face Dimensions: ANSI B16.10

Flange end Dimension :ANSI B16.5

Butt Welded Dimensions：ANSI B16.25

Design and Manufacture：API 609

Pressure Test：API598

Materials：WCB 、WC6 、WC9 、CF8、 CF8M、 CF3、 CF3M 、CN7M、LC1

LC2、LC3、LCB、LCC、Monel、20# Alloys、4A、5A、C95800、C95500, ect.

Class150
API 609 Butterfly Valves

NPS	in	2	3	4	6	8	10	12	14	16	18	20	24
d	mm	51	76	102	152	203	254	305	337	387	438	489	591
L(RF)	mm	43	48	54	57	64	71	81	92	102	114	127	154
\L1(RF)	mm	108	114	127	140	152	165	178	190	216	222	229	267
d1	mm	92	127	157	216	270	324	381	413	470	533	584	692
d2	mm	120.5	152.5	190.5	241.5	298.5	362	432	476	540	578	635	749.5
D	mm	152	190	229	279	343	406	483	533	597	635	699	813
b	mm	16	19	24	26	29	31	32	35	37	40	43	48
n-Фd	mm	4-19	4-19	8-19	8-22	8-22	12-25	12-25	12-29	16-29	16-32	20-32	20-35
H	mm	225	255	285	332	386	427	498	510	540	585	642	693
H1	mm	112	126	146	170	218	245	290	316	352	386	415	482
W	mm	300	300	300	300	300	300	500	500	600	600	600	600

Class300
API 609 Butterfly Valves

NPS	in	3	4	6	8	10	12	14	16	18	20	24
d	mm	76	102	152	203	254	305	337	387	432	483	584
L(RF)	mm	48	54	59	73	83	92	117	133	149	159	181
\L1(RF)	mm	114	127	140	152	165	178	190	216	222	229	267
d1	mm	127	157	216	270	324	381	413	470	533	584	692
d2	mm	168.5	200	270	330	387.5	451	514.5	571.5	628.5	686	813
D	mm	210	254	318	381	445	521	584	648	711	775	914
b	mm	29	32	37	42	48	51	54	58	61	64	70
n-Фd	mm	8-22	8-22	12-22	12-25	16-29	16-32	20-32	20-35	24-35	24-35	24-41
H	mm	265	290	355	418	456	498	547	582	651	704	780
H1	mm	130	150	185	236	273	313	338	392	420	465	532
W	mm	300	300	300	500	500	600	600	600	600	600	600

API Trim NO.
Table

No of internal parts	Seat ring or body	Gate、disc 、ball or body	Stem	No of internal parts	Seat ring or body	Gate、disc 、ball or body	Stem
01	13Cr	13Cr	13Cr	31	STELLITE	321SS	321SS
02	304SS	304SS	304SS	32	STELLITE	STELLITE	321SS
03	310SS	310SS	310SS	33	347SS	347SS	347SS
04	HARD 13Cr	HARD 13Cr	13Cr	34	STELLITE	347SS	347SS
05	STELLITE	STELLITE	13Cr	35	NICKEL ALLOY	13Cr	13Cr
06	Cu-Ni	13Cr	13Cr	36	A105/PTFE	A105+ENP	A105+ENP
07	13Cr	HARD 13Cr	13Cr	37	A105/PTFE	WCB+ENP	A105+ENP
08	STELLITE	13Cr	13Cr	38	13Cr/PTFE	13Cr	13Cr
09	Cu-Ni	Cu-Ni	Cu-Ni	39	304SS/PTFE	304SS	304SS
10	316SS	316SS	316SS	40	316SS/PTFE	316SS	316SS
11	Cu-Ni	STELLITE	Cu-Ni	41	A105/RPTFE	A105+ENP	A105+ENP
12	STELLITE	316SS	316SS	42	A105/RPTFE	WCB+ENP	A105+ENP
13	ALLOY 20	ALLOY 20	ALLOY 20	43	13Cr/RPTFE	13Cr	13Cr
14	STELLITE	ALLOY 20	ALLOY 20	44	304SS/RPTFE	304SS	304SS
15	STELLITE	STELLITE	304SS	45	316SS/RPTFE	316SS	316SS
16	STELLITE	STELLITE	316SS	46	A105/NYLON	A105+ENP	A105+ENP
17	STELLITE	STELLITE	347SS	47	A105/NYLON	WCB+ENP	A105+ENP
18	STELLITE	STELLITE	ALLOY 20	48	A105/NYLON	304SS	304SS
19	MONEL	MONEL	MONEL	49	A105/NYLON	316SS	316SS
20	BRONZE	BRONZE	13Cr	50	13Cr/NYLON	13Cr	13Cr
21	HASTELLOY B	HASTELLOY B	HASTELLOY B	51	304SS/NYLON	304SS	304SS
22		HASTELLOY C	HASTELLOY C	52	316SS/NYLON	316SS	316SS
23	STELLITE	304SS	304SS	53	A105/PEEK	A105+ENP	A105+ENP
24	304LSS	304LSS	304LSS	54	A105/PEEK	WCB+ENP	A105+ENP
25	STELLITE	304LSS	304LSS	55	13Cr/PEEK	13Cr	13Cr
26	STELLITE	STELLITE	304LSS	56	304SS/PEEK	304SS	304SS
27	316LSS	316LSS	316LSS	57	316SS/PEEK	316SS	316SS
28	STELLITE	316LSS	316LSS
29	STELLITE	STELLITE	316LSS
30	321SS	321SS	321SS

Note:please indicate it directly in the
order for the internal part’smaterial uncovered in the table

Frequently Asked Questions

What does API 609 cover?

API 609 is the specification for butterfly valves, defining dimensions, pressure-temperature ratings and seat requirements for both concentric (Category A) and double-offset (Category B) designs used in petroleum and related industries.

Can a wafer butterfly valve be used at the end of a line?

Generally no — the wafer body is held only by the two surrounding flanges, so it needs a downstream flange to stay seated. For dead-end or end-of-line isolation, choose a lug-type body, which is retained by its own threaded inserts.

What pressure and size range do you supply?

Class 150 from NPS 2″ to 24″ and Class 300 from NPS 3″ to 24″, with face-to-face to ANSI B16.10 and flange drilling to ANSI B16.5. Non-standard sizes and ratings can be quoted on request.

Which body material should I choose for seawater or corrosive service?

For seawater, Monel or bronze-alloy bodies (C95800 / C95500) resist biofouling and corrosion; for chemical duty, CF8M (316) stainless is the common choice. Tell us the medium and we will recommend the trim.

How are the valves tested before shipment?

Every valve is pressure-tested in accordance with API 598 (shell and seat leakage test) and inspected against the ordered API Trim No. before dispatch. Test certificates are available on request.

Need a quote or a non-standard trim? Contact the Sedelon team with your medium, pressure class and NPS – we will specify the body, seat and API Trim No. for you.