Flanged Butterfly Valve

Expansion Flanged Butterfly Valve

Product Use

Expansion Flanged butterfly valve mainly used for petroleum industry, chemical industry, food industry, medical industry, power industry, water and drain, gas pipeline as flow adjustment and medium interruption. Having countervail due to the expands with heat and contracts with cold occur pipeline installation dimension, can be convenient for old pipeline transform, maintenance and installation renewal.

Structure Features

With flange butterfly valve and expansion joint self contained's new structure, countervail pipeline temperature differential occur expands with heat and contracts with cold make a influence of installation dimension, become a valve multi-function products;
Due to the double-eccentric design principle, the moment of valve opening and closing are small, flexible operation, light and convenient;
Seat sealing are corrosion resistant, weather resistance, anti-abrasive, long lifetime;
Disc seat ring adopt rubber seat ring, own sealing zero leakage feature;
Expansion part have reliable seal performance, convenient to installation, adjustment, renewal and maintenance;
Accordance with the requests of consumers, can choose electric actuator, pneumatic operated, hydraulic actuator, electro-magnetic-hydraulic actuator or any other actuator, can implement long distance control and automatic operated.

Expansion Flanged Butterfly Valve Installation Attention Detail

When the pipeline installation spacing over sizing the expansion joint butterfly valve's installation dimension, please adjust the pipeline installation space, do not force to pull expansion joint valve, in order to avoid damaging the valve;
Expansion joint butterfly valve as temperature compensate expansion use, should add support between pipeline axis direction end, in order to avoid valve expansion tube outstretch, forbid to remove the support during the operation.(see picture 1);
Expansion joint butterfly valve doesn't as temperature compensate, only as installation, adjustment and maintenance, should adopt fastening pieces symmetric clamp expansion joint butterfly valve limiter, in order to avoid valve expansion tube outstretch, damage expansion joint butterfly valve and pipeline device (see picture 2);
The expansion part of expansion joint butterfly valve can't install at pipeline corner or the end of pipeline.

Expansion Flanged Butterfly Valve

Main Size of Outside

DN (mm)	inch	H	H1	Lmax	Lmin	L	A	B	PN0.6 D	D1	D2	n-d0	PN1.0 D	D1	D2	n-d0	PN1.6 D	D1	D2	n-d0
50	2	80	309	164	138	151	180	200	140	110	88	4-14	165	125	99	4-18	165	125	99	4-18
65	2½	95	337	190	154	172	180	200	160	130	108	4-14	185	145	118	4-18	185	145	118	4-18
80	3	98	347	195	163	177	180	200	190	150	124	4-18	200	160	132	8-18	200	160	132	8-18
100	4	114	373	227	184	206	180	200	210	170	144	4-18	220	180	156	8-18	220	180	156	8-18
125	5	128	405	254	201	215	180	200	240	200	174	8-18	250	210	184	8-18	250	210	184	8-18
150	6	139	440	240	195	225	270	280	265	225	199	8-18	285	240	211	8-22	285	240	211	8-22
200	8	174	612	265	215	245	400	425	320	280	254	8-18	340	295	266	8-22	340	295	266	12-22
250	10	215	693	295	235	265	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	325	271	300	450	560	490	445	413	12-22	505	460	429	16-22	520	470	429	16-26
400	16	305	991	345	283	314	535	580	540	495	463	16-22	565	515	480	16-26	580	525	480	16-30
450	18	325	1037	370	314	340	535	580	595	550	518	16-22	615	565	530	20-26	640	585	548	20-30
500	20	360	1127	377	316	346	535	580	645	600	568	20-22	670	620	582	20-26	715	650	609	20-33
600	24	445	1377	446	388	417	570	660	755	705	667	20-26	780	725	682	20-30	840	770	720	20-36
700	28	505	1496	445	395	425	750	550	860	810	772	24-26	895	840	794	24-30	910	840	794	24-36
800	32	560	1584	479	425	455	750	550	975	920	878	24-30	1015	950	901	24-33	1025	950	901	24-39
900	36	630	1676	515	455	485	750	550	1075	1020	978	24-30	1115	1050	1001	28-33	1125	1050	1001	28-39
1000	40	680	1760	525	465	495	900	750	1175	1120	1078	28-30	1230	1160	1112	28-36	1255	1170	1112	28-42
1200	48	795	2018	574	512	542	1000	925	1405	1340	1295	32-33	1455	1380	1328	32-39	1485	1390	1328	32-48

Manufacturing Process

Step 1: Order and Design

Based on the customer's requirements for pressure level, connection standard, valve body material, sealing form and drive method, the production plan and drawings for the flanged butterfly valve are formulated. The flange size, valve plate structure, valve stem configuration and actuator matching are confirmed to ensure that the product meets the actual working conditions.

Flanged Butterfly Valve

Step 2: Forging & Casting

The main components of a flanged butterfly valve, such as the valve body and valve plate, are usually formed through casting or forging processes. The valve body is typically made of ductile iron, carbon steel or stainless steel to ensure its strength, pressure resistance and corrosion resistance.

Flanged Butterfly Valve

Step 3: Machining

Carry out precise mechanical processing on the valve body, valve plate, valve stem and flange connection surface. During this stage, for the flanged butterfly valve, the sealing surface processing, hole position processing, flange end face treatment and assembly size control need to be completed to ensure the interchangeability and sealing performance of the parts.

Flanged Butterfly Valve

Step 4: Assembly

Assemble the processed valve body, butterfly plate, valve seat, valve stem, bearing and actuator. The assembly process of the flanged butterfly valve requires strict control of concentricity and opening/closing flexibility to ensure smooth operation, reasonable torque and reliable sealing.

Flanged Butterfly Valve

Step 5: Testing & Quality Assurance

After assembly is completed, the flanged butterfly valve undergoes shell strength testing, sealing test, operation test and appearance inspection. Through pressure testing and opening/closing test, it is ensured that the valve complies with relevant standards and customer requirements.

Flanged Butterfly Valve

Step 6: Painting and Finishing

After passing the inspection, the surface cleaning, rust prevention treatment, spraying and marking installation are carried out. The finished products are finally sorted and packaged and then stored in the warehouse, ensuring that the valves have good protective performance and appearance quality during transportation and use.

Flanged Butterfly Valve

Applications

The flanged butterfly valve is widely used and is commonly found in fields such as steam power plants, mining, food and beverage processing, pharmaceuticals, municipal water supply and sewage treatment, fire protection systems, paper and pulp production, petroleum refining, chemical manufacturing, as well as HVAC systems. Among these, in the food and beverage and pharmaceutical industries, it is particularly suitable due to its ease of cleaning and the ability to enhance hygiene levels.

These valves are widely used in:

Oil and Gas

Chemical Processing

Power Plants

Water Treatment

Metallurgy and Mining

Agriculture and Irrigation

Factory Environment

Factory Production Line

Material Storage

Quality Control

Assembly Workshop

Quality Control

Assembly Workshop

Why Choose Us

Superior Quality

Our valves are manufactured using premium materials and undergo rigorous quality testing to ensure reliable performance in demanding industrial applications.

Advanced Technology

Equipped with state-of-the-art CNC machining centers and precision manufacturing equipment, we deliver valves with exceptional accuracy and consistency.

Competitive Pricing

Through optimized manufacturing processes and bulk material procurement, we offer high-quality valves at competitive prices without compromising on quality.

Expert Support

Our experienced technical team provides comprehensive support from product selection to after-sales service, ensuring optimal valve performance for your specific application.

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