Double Flange Triple Offset Butterfly Valve

Size Range: NPS 2"~NPS 160" (DN50~DN4000）
Rating: Class 150~Class1500 (PN10~PN250)
Body Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex stainless steel etc.
Disc Sealing: Metal to metal, Graphite Laminated, PTFE
Design Standard: API609, MSS SP-68, EN593, EN12569, GOST, JIS, GB
Face to Face Standards: ANSI B16.10
Flange Standards: ASME B16.5, ASME B16.47, EN 1092, ISO 7005, JIS B2220, GOST 33259, GB/T 9124.1
End Connection: Double Flange
Operation: Handwheel, Worm Gear, Electric, Pneumatic, Hydraulic
Suitable Medium: Water, Oil, Gas, Steam etc.

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Details

Our products now cover a wide range of standardized fluid control products that can be adapted to a variety of drive modes, comprising ball valves, butterfly valves, gate valves, globe valves, check valves, safety valves, rotary ball valves, plunger valves etc. Our products are widely used in water conservancy, municipal, electric power, gas, petrochemical, coal chemical, energy, environmental protection, medicine, real estate, metallurgy, mining and many other fields.

Design Features of Double Flange Triple Offset Butterfly Valve
Engineered for demanding service conditions, the double flange triple offset butterfly valve delivers superior performance for critical process systems demanding bubble-tight shutoff, high pressure endurance and extreme temperature resistance. It integrates the compact footprint of a butterfly valve with the robust sealing performance of globe and gate valves, serving as a preferred solution for oil & gas, petrochemical, power generation and steam piping systems.

Bubble-Tight Zero Leakage
Adopting triple offset geometry to create a full metal-to-metal seal between disc and seat, the valve operates independent of elastomeric materials. It achieves reliable bubble-tight isolation, perfectly suited for steam, hydrocarbon and chemical media where any leakage is prohibited.
Low Operating Torque & Extended Component Life
The cam-style disc movement drastically reduces frictional contact during opening and closing, effectively mitigating wear on seat and disc. Lower actuation torque cuts down actuator sizing requirements and overall operational energy costs.
Wide Pressure & Temperature Rating
Rated for pressure classes from Class 600 up to Class 1500, with maximum service temperature reaching 1,000°F (538°C). It maintains stable performance across steam, oil & gas and refinery process applications.
Double Flange End Connection
Double flange ends establish rigid, leak-tight joints with pipeline flanges and prevent gasket blowout under harsh operating conditions. Direct bolt-on installation to standard piping eliminates extra adapters, simplifying field mounting.
Excellent Durability & Low Maintenance
Seating faces are overlaid with hardened stainless steel or Stellite alloy, offering outstanding resistance against erosion and corrosion. Unlike soft-seated valves, this metal-seated design requires minimal routine adjustment and part replacement for long-term service.
Flanged End Design
Guarantees rigid structural stability and straightforward installation on industrial piping.

Main Performance Specifications
Nominal Diameter DN (mm)	DN（mm）	50-4000
Nominal Pressure PN (MPa):	PN（MPa)	1	1.6	2.5
Test Pressure (MPa)	Shell Strength Test	1.5	2.4	3.75
	Seat Leakage Test	1.1	1.76	2.75
	Air Tightness Test	0.6	0.6	0.6

Parts and Materials
Model		D343H-16	D343W-16P	D343W-16R
Working Pressure (MPa)		1.6
Applicable Temperature (°C)		≤425	≤200
Applicable Media		Water, oil, or non-corrosive media	Nitric acid media	Acetic acid media
Materials	Body & Disc	WCB	CF8/304	CF3M/316L
	Stem	2Cr13	304	316L
	Body Sealing Surface	Hardfaced with Alloy 507	－	－
	Disc Sealing Surface	304 + Flexible Graphite	304＋PTFE	304＋PTFE
	Packing	Flexible Graphite	PTFE	PTFE

Drawings and Main Dimensions

Class	NPS	Main Dimensions (mm)
Class	(in)	L	H1	H2	D	D1	D2	b	N-Φ
150LB	2	108	85	196	152	120.5	92	19	4-19
	2 1/2	112	90	211	180	139.5	105	22	4-19
	3	114	100	230	190	152.5	127	24	4-19
	4	127	107	256	229	190.5	157	24	8-19
	5	140	123	288	254	216	186	24	8-22
	6	140	140	315	280	241.5	216	26	8-22
	8	152	180	350	345	298.5	270	28	8-22
	10	165	200	398	405	362	324	30	12-25
	12	178	250	431	485	432	381	32	12-25
	14	190	270	478	535	476	412	35	12-28.5
	16	216	350	513	595	540	470	36	16-28.5
	18	222	365	550	635	578	535	40	16-32
	20	229	410	615	700	635	584	43	20-32
	24	267	470	670	815	749.5	692	48	20-35
	28	292	495	750	837	795	762	45	40-23
	32	318	575	820	942	900	864	46	48-23
	36	330	620	895	1057	1010	972	52	44-26
	40	410	680	990	1175	1120.5	1080	56	44-28.5
	48	470	870	1260	1392	1335	1290	65	44-32
300LB	2	150	85	196	165	127	92	23	8-19
	2 1/2	170	90	211	190	149	105	26	8-22
	3	180	100	230	210	168	127	28	8-22
	4	190	107	256	255	200	157	30	8-22
	5	200	123	288	280	235	186	35	8-22
	6	210	140	315	320	270	216	35	12-22
	8	230	180	350	380	330	270	40	12-25
	10	250	200	398	445	387.5	324	46	16-28.5
	12	270	250	431	520	451	381	49	16-32
	14	290	270	478	585	515	413	54	20-32
	16	310	350	513	650	571.5	470	56	20-35
	18	330	365	550	712	628	535	60	24-35
	20	350	410	615	775	686	584	62	24-35
	24	390	470	670	915	813	692	68	24-41
	28	430	495	750	921	857	788	89	26-35
	32	470	575	820	1055	978	902	103	32-42
	36	510	620	895	1172	1089.5	1010	103	32-45
	40	550	680	990	1273	1190.5	1115	116	40-45
	48	630	870	1260	1511	1416	1327	129	40-51
The above dimensions are for reference only. Please contact our company for valve selection and structural dimensions applicable to actual working conditions.