Large Diameter Triple Offset Butterfly Valve

The large diameter triple offset butterfly valve adopts a triple-offset geometric design. The sealing surfaces avoid continuous friction during valve opening and closing; metal cone sealing engages only at the final closing position, greatly extending the service life of sealing components. Featuring metal-to-metal hard sealing, it delivers reliable bi-directional tight shutoff under high temperature and high pressure conditions.
Compared with gate valves of the same nominal size, it has a compact structure, lighter weight, smaller footprint and fast stroke, compatible with both electric and pneumatic actuators.

It is widely applied in large-bore pipelines for power plants, district heating, petrochemical industries, serving media such as high-temperature steam, circulating water and flue gas for pipeline isolation and shutoff.

Electric and starter actuators can also be adapted based on operating conditions and customer requirements.

Body metrial

iron. cast steel. stainless steel

Note: This valve is designed for shut-off service rather than precise continuous flow regulation. It can work together with power station high pressure control valves.

DN		Structural Length		Dimensions										Connection Dimensions
DN		L		H	D343H			D643H			D943H			0.6MPa			1.0MPa
mm	inch			H	H1	A1	B1	H2	A2	B2	H3	A3	B3	D	D1	Z-d	D	D1	Z-d
50	2	108	150	112	350	180	200	625	245	72	530	250	255	140	110	4-14	165	125	4-18
65	2?	112	170	115	370	180	200	625	245	72	530	250	255	160	130	4-14	185	145	4-18
80	3	114	180	120	380	180	200	645	245	72	565	250	255	190	150	4-18	200	160	8-18
100	4	127	190	138	420	180	200	675	355	92	600	250	255	210	170	4-18	220	180	8-18
125	5	140	200	164	460	180	200	715	355	92	640	250	255	240	200	8-18	250	210	8-18
150	6	140	210	175	555	270	280	800	355	92	705	300	315	265	225	8-18	285	240	8-22
200	8	152	230	200	760	400	425	850	250	170	775	300	315	320	280	8-18	340	295	8-22
250	10	165	250	243	830	400	425	925	250	170	945	300	315	375	335	12-18	395	350	12-22
300	12	178	270	250	895	450	560	1035	450	220	1070	300	315	440	395	12-22	445	400	12-22
350	14	190	290	280	950	450	560	1070	450	220	1140	300	315	490	445	12-22	505	460	16-22
400	16	216	310	305	1190	535	580	1190	450	220	1210	300	315	540	495	16-22	565	515	16-26
450	18	222	330	350	1255	535	580	1250	650	280	1335	575	414	595	550	16-22	615	565	20-26
500	20	229	350	380	1305	535	580	1290	650	280	1415	575	714	645	600	20-22	670	620	20-26
600	24	267	390	445	1340	570	660	1455	850	380	1605	656	810	755	705	20-26	780	725	20-30
700	28	292	430	480	1520	750	550	1585	850	380	1844	656	810	860	810	24-26	895	840	24-30
800	32	318	470	530	1710	750	550	1700	1250	380	2040	656	810	975	920	24-30	1015	950	24-33
900	36	330	510	580	1810	750	550	1865	1250	380	2255	785	863	1075	1020	24-30	1115	1050	28-33
1000	40	410	550	650	1960	900	750	2015	1250	380	2380	785	863	1175	1120	28-30	1230	1160	28-36
1200	48	470	630	760	2250	1000	925	2250	1250	380	2640	785	863	1405	1340	32-33	1455	1380	32-39
1400	56	530	710	850	2435	1000	925				2886			1630	1560	36-36	1675	1590	36-42
1600	64	600	790	1030	2780	1000	925				3156			180	1760	40-36	1915	1820	40-48
1800	72	670	870	1230	3020	1100	980				3421			2045	1970	44-39	2115	2020	44-48
2000	80	760	950	1350	3270	1100	980				3685			2265	2180	48-42	2325	2230	48-48

FAQ

Q1: What are the key advantages of triple offset butterfly valves over concentric butterfly valves?
A: Concentric butterfly valves suffer from constant seal friction during operation and cannot withstand high temperature and pressure. Thanks to the cam effect of triple offset geometry, the sealing surfaces stay separated during rotation without scratching. With metal hard seal, it achieves tight isolation for high-temperature & high-pressure media and offers longer service life.

Q2: Can the large diameter triple offset butterfly valve be used for continuous flow regulation?
A: It is engineered as an isolation shut-off valve. Minor throttling is possible, but it is not suitable for long-term, high-precision continuous flow control. For accurate regulation of pressure and flow, power station high pressure control valves are recommended.

PRODUCT

Large Diameter Triple Offset Butterfly Valve

FAQ