Rectangular Damper Butterfly Valve

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Rectangular Damper Butterfly Valve

Carbon Steel (WCB, WCC for strength), Stainless Steel (SS304, SS316 for corrosion resistance)

Size Range:2″ to 48″ (DN50-DN1200)

Working Pressure:Up to 300 psi (20.7 bar)

Working Temperature:-30°C to 350°C

Sealing Options:EPDM, PTFE, Metal-to-Metal, NBR, FKM

Manufacturing Method:Cast, Forged, Machined

Applicable Medium:Water, Oil, Gas, Air, Chemical Fluids

Manufacturing Standard:API 609, ASME B16.47, MSS-SP-67, BS EN 593, ISO 5752

Product Overview

The Rectangular Damper Butterfly Valve is designed for precise flow control in HVAC, industrial ventilation, and exhaust systems. Featuring a rectangular or square design to fit duct shapes, it enables effective modulation of air or gas flow. Equipped with a rotating disc that regulates the passage of media, this valve offers smooth operation, low torque, and excellent sealing capabilities. Constructed from durable materials such as stainless steel or carbon steel, it is suitable for high-temperature and corrosive environments. Ideal for applications requiring reliable, adjustable air flow control in ductwork or large-scale ventilation systems.

Product Features

FDBD-0.5 / FSBD-0.5

Electric (hand) Dynamic Multi-Leaf Valve (for Fan Special Valve)

◆ Structural Characteristics and Purpose

This valve is also known as a fan-started control valve. It can be matched with various actuators and transmission mechanisms, and features:

Multiple blades
Limited stroke
Compact structure
Low noise
Large flow capacity
Simple operation
Low differential pressure loss

◆ Key Properties

Property	Value/Description
Nominal Pressure	0.05 MPa
Applicable Temperature Range	–20°C to 300°C
Leak Rate	≤ 3% (regular type), ≤ 1% (low-leak type)
Applicable Medium	Air, fume, dust-containing gas, combustible gases
Power Supply Voltage	220V or 380V AC

Specification Parameters

◆ External Dimensions and Connection Size (For Fan Use Only)

DN×DN	C×D	A×B	L	n–φd	Fans	Machine Number	H	FDBD-0.5	FSBD-0.5
128×92	180×148	160×126	160	14–φ7	NO.4		462	DKJ–210	S–01
144×104	498×160	176×135			NO.4.5		468
160×115	214×171	192×150			NO.5		476
179×129	233×185	212×162			NO.5.6		490
202×145	256×204	236×180			NO.6.3		480
196×128	250×134	228×165			NO.4		484
221×144	275×200	252×177			NO.4.5		495
245×160	299×216	284×192		18–φ7	NO.5		585
174×179	328×235	305×212			NO.5.6		518
309×202	365×261	340×236			NO.6.3		504
227×163	293×204	265×185		14–φ7	NO.7.1		514
256×184	322×253	296×228		14–φ7	NO.8		526
288×207	354×276	330×252		18–φ10	NO.9		537
320×230	386×299	360×275		9–19	NO.10		563
359×258	448×350	415×316		18–φ12	NO.11.2		574
400×288	489×350	456×344	180	20–φ12	NO.12.5		604	DKJ–310
448×322	521×464	516×405		22–φ12	NO.14		620
512×368	621×464	574×400		24–φ12	NO.16		628
348×227	441×296	390×272		20–φ10	NO.7.1		528
392×256	458×325	432×300			NO.8		543
441×288	507×357	482×330			NO.9		550
490×320	556×389	528×356			NO.10		575
540×358	638×450	600×410	200	26–φ12	NO.11.2		605		S–02
613×400	702×492	604×456		28–φ12	NO.12.5		626
686×448	795×564	747×516		30–φ12	NO.14		662	DKJ–410
784×512	893×628	840×588		34–φ12	NO.16		759	DKJ–410
256×199	314×254	290×231	160	14–φ7	NO.4		514	DKJ–210	S–01
324×252	382×306	360×285	180	18–φ7	NO.5	Y5–48	534	DKJ–310
409×315	466×371	443×348		18–φ7	NO.6.3		566	DKJ–410
520×400	632×509	580×462		18–φ15	NO.8		635		S–02
655×504	771×613	728×570	220	24–φ15	NO.10		687
815×627	935×737	888×690	220	28–φ15	NO.12.5		841
228×196	277×250	256×228	160	16–φ7	NO.2.8		511	DKJ–210	S–01
256×224	300×278	288×256			NO.3.2	4–72	528
288×252	341×306	320×285			NO.3.6		532
320×280	374×336	355×315	180	20–φ7	NO.4		554	DKJ–310
360×315	414×371	396×350		20–φ7	NO.4.5		566
400×350	456×406	435×385		24–φ7	NO.5		529

External Dimensions and Connection Size (Blower Fan Valve Only)

DN×DN	C×D	A×B	L	n–φd	Fan Model	Machine Number	H	FDBD–0.5	FSBD–0.5
480×420	611×465	536×476	180	24–φ7	NO.6	4-72	618	DKJ–310	S–02
640×560	700×625	748×609	200	20–φ15	NO.8		715	DKJ–310
800×700	800×766	900×800	220	20–φ15	NO.10		785	DKJ–410
960×840	1008×900	1008×949	240	22–φ15	NO.12		919	DKJ–410
1280×1120	1340×1188	1380×1232	260	38–φ15	NO.14		1056	DKJ–510	S–04
1800×1300	1672×1476	1735×1558	320	40–φ15	NO.16	Y4–73	1329	DKJ–610
720×580	777×580	828×629	220	24–φ15	NO.8		760	DKJ–610
810×580	868×580	918×694	220		NO.9		810	DKJ–410	S–03
800×650	969×710	1008×759	240		NO.10		836
990×713	1048×780	1098×724	200	28–φ15	NO.11		862
1080×780	1144×846	1198×887			NO.12		911
1260×910	1336×980	1389×1042			NO.14	Q4–73	963	DKJ–510
1540×1010	1312×1120	1669×1172	320	32–φ10	NO.16		994
1620×1010	1110×1262	1770×1338	320	32–φ10	NO.18		1158
1800×1300	1890×1360	1995×1426	420		NO.20		1263	DKJ–610	S–04
1980×1430	2070×1560	2139×1596	420	36–φ15	NO.22		1385
2250×1625	2375×1760	2450×1841	450	42–φ15	NO.26		1561
2520×1805	2600×1965	2732×2030	450	48–φ15	NO.28		1718

Specification Applications

Rectangular damper butterfly valve is ideal for conditions with large openings, high flow rates, and low differential pressure (e.g., intake/exhaust of blowers).
Commonly used in:

Metallurgy
Mining
Building materials
Chemical industry
Power plants
Ventilation and dust removal systems
Air/gas switching and shutoff systems

Valve Actuation

Process Optimization

Precision Engineering

Pipeline Solutions

Industrial Valves

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