Flexible Butterfly Valve Resilient Seated EPDM PTFE for Water Treatment HVAC Chemical China Manufacturer

Flexible Butterfly Valve

The telescopic butterfly valve is a centerline butterfly valve that complies with national standards. It is equipped with an adjustable telescopic device (such as an expansion joint or adjusting bolt), which compensates for pipeline thermal expansion and contraction or installation errors through axial displacement. It also has bidirectional sealing and fast opening and closing functions, and is suitable for temperature difference scenarios such as HVAC and thermal pipelines. It is suitable for water, gas, and weakly corrosive media, with a pressure rating of ≤ PN16 and a temperature coverage of -20 ℃~+425 ℃.

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Multi scenario adaptability
Convenient maintenance and long lifespan
Fast opening and closing and diversified driving
Low flow resistance and efficient circulation
Thermal expansion and contraction compensation function
Bidirectional sealing and adjustable compensation
Compact structure and lightweight design

Multi scenario adaptability

Multi scenario adaptability
01
Applicable temperature range -20 ℃~+425 ℃, pressure rating ≤ PN16, covering industries such as petroleum, chemical, power, metallurgy, etc;
02
Adapt to corrosive media or high-temperature environments by replacing sealing materials such as nitrile rubber, fluororubber, and metal alloys.

Convenient maintenance and long lifespan

Convenient maintenance and long lifespan
01
The sealing components can be independently replaced, and there is no need to disassemble the valve as a whole during maintenance, significantly reducing maintenance costs;
02
The valve body is made of ductile iron, cast steel, or stainless steel, which is corrosion-resistant, high-temperature resistant, and suitable for harsh working conditions.

Fast opening and closing and diversified driving

Fast opening and closing and diversified driving
01
Rotate 90 ° to complete the fully open/fully closed action, with a short response time (≤ 5 seconds), supporting manual, worm gear, pneumatic or electric drive;
02
The flow regulation range is 0-90 °, meeting precise control requirements, with small operating torque and easy opening and closing.

Low flow resistance and efficient circulation

Low flow resistance and efficient circulation
01
Full diameter flow channel design, with butterfly plate thickness as the sole obstruction source, resulting in low pressure drop when the medium passes through, nearly linear flow characteristics, and high adjustment accuracy;
02
Suitable for high flow transportation of low viscosity media such as water and gas, especially suitable for the water supply and drainage and petrochemical industries.

Thermal expansion and contraction compensation function

Thermal expansion and contraction compensation function
01
Built in telescopic adjustment device compensates for the axial displacement of the pipeline caused by temperature changes by adjusting bolts or expansion joints, reducing system stress damage;
02
Suitable for working conditions with frequent temperature changes (such as HVAC systems and thermal power stations), to avoid valve leakage caused by thermal deformation.

Bidirectional sealing and adjustable compensation

Bidirectional sealing and adjustable compensation
01
Supports two forms of elastic rubber or metal hard sealing: rubber sealing ring can be used for bi-directional compression sealing, and the low-pressure leakage meets the standard; Metal hard seals enhance temperature resistance (≤ 425 ℃) and wear resistance through a multi-layer soft stacked structure;
02
The elastic valve seat design can compensate for slight deformation of the sealing surface and extend its service life.

Compact structure and lightweight design

Compact structure and lightweight design
01
Adopting a symmetrical midline design, the valve body and expansion device are integrated into a small number of components, with a small volume and light weight, making it easy to transport and install;
02
Short structure steel plate welded valve body combined with butterfly plate rotating opening and closing, occupying small space, suitable for narrow pipeline layout.

Main Component Materials

Part Name	material
valve body	Cast iron, cast steel, stainless steel, chromium molybdenum steel, alloy steel
butterfly valve disc	Cast steel, alloy steel, stainless steel, chromium molybdenum steel
sealing ring	Rubber, polytetrafluoroethylene, polyester, stainless steel
valve stem	2Cr13、 Stainless steel, chromium molybdenum steel
telescopic tube	Cast iron, cast steel, stainless steel, chromium molybdenum steel
filler	flexible graphite

Performance Specifications & Dimensions

Nominal pressure PN

0.6/1.0/1.6/2.5/4.0/6.4
Shell F

P x 1.5
Sealing Pressure

P x 1.1
Medium

Air, steam, gas, oil, etc.
Temperature (℃)

≤80℃

Nominal Diameter DN(mm)		External dimensions (reference value)							Flange size and bolt hole size (standard value)
Nominal Diameter DN(mm)		H	H1	Design maximum length	Design minimum length	Design length L	A	B	PN0.6MPa				PN1.0MPa				PN1.6MPa
mm	inch	H	H1	Design maximum length	Design minimum length	Design length L	A	B	D	D1	D2	Z-Φd	D	D1	D2	Z-Φd	D	D1	D2	Z-Φd
50	2	80	309	186	156	171	180	200	140	110	88	4-14	165	125	99	4-18	165	125	99	4-18
65	2 1/2"	95	337	190	160	175	180	200	160	130	108	4-14	185	145	118	4-18	185	145	118	4-18
80	3	98	347	198	166	182	180	200	190	150	124	4-18	200	160	132	8-18	200	160	132	8-18
100	4	114	373	228	188	208	180	200	210	170	144	4-18	220	180	156	8-18	220	180	156	8-18
125	5	128	405	240	201	220	180	200	240	200	174	8-18	250	210	184	8-18	250	210	184	8-18
150	6	139	440	246	206	226	270	280	265	225	199	8-18	285	240	211	8-22	285	240	211	8-22
200	8	174	612	265	219	242	400	425	320	280	254	8-18	340	295	266	8-22	340	295	266	12-22
250	10	215	693	295	240	267	400	425	375	335	309	12-18	395	350	319	12-22	405	355	319	12-26
300	12	245	747	308	254	282	450	560	440	395	363	12-22	445	400	370	12-22	460	410	370	12-26
350	14	270	802	327	272	300	450	560	490	445	413	12-22	505	460	429	16-22	520	470	429	16-26
400	16	305	991	368	308	338	535	580	540	495	463	16-22	565	515	480	16-26	580	525	480	16-30
450	18	325	1037	370	310	340	535	580	595	550	518	16-22	615	565	530	20-26	640	585	548	20-30
500	20	360	1127	392	332	362	535	580	645	600	568	20-22	670	620	582	20-26	715	650	609	20-33
600	24	445	1377	441	375	408	570	660	755	705	667	20-26	780	725	682	20-30	840	770	720	20-36
700	28	505	1496	460	400	430	750	550	860	810	772	24-26	895	840	794	24-30	910	840	794	24-36
800	32	560	1584	499	445	475	750	550	975	920	878	24-30	1015	950	901	24-33	1025	950	901	24-39
900	36	630	1676	520	460	490	750	550	1075	1020	978	24-30	1115	1050	1001	28-33	1125	1050	1001	28-39
1000	40	680	1760	600	530	565	900	750	1175	1120	1078	28-30	1230	1160	1112	28-36	1255	1170	1112	28-42
1200	48	795	2018	675	571	623	1000	925	1405	1340	1295	32-33	1455	1380	1328	32-39	1485	1390	1328	32-48
1400	56	900	2363	760	683	722	1000	925	1630	1560	1510	36-36	1675	1590	1530	36-42	1685	1590	1530	36-48
1600	64	1100	2723	860	770	815	1000	925	1830	1760	1710	40-36	1915	1820	1750	40-48	1930	1820	1750	40-56
1800	72	1124	2844	930	830	880	1100	980	2045	1970	1718	44-39	2115	2020	1950	44-48	2130	2020	1950	44-56
2000	80	1292	3127	1020	920	970	1100	980	2265	2180	2125	48-42	2325	2230	2150	48-48	2345	2230	2150	48-62

Note: The pressure range is 1.6MPa~6.4MPa. The above data is for reference only. Please consult the company's sales department for details.

Valve Application

Oil & Gas Transportation

Oil and gas transportation involves multiple modes such as pipelines and ships, and is the core link of the energy supply chain.
Chemical Raw Material Control

The control of chemical raw materials covers the entire process of mining, storage, and production, ensuring safety and process stability.
High Temperature SteamPipeline in Power System

High temperature steam pipelines are the core of energy transmission in power systems, supporting the efficient operation of thermal and nuclear power plants.
Other Industries

Valves control fluids in multiple industries such as new energy and electronics, ensuring safe and efficient production.