Ventilation Butterfly Valve - Knowledge - GNEE Multinational Trade

The ventilation butterfly valve is a widely used valve in ventilation systems, featuring simple structure, convenient operation, good sealing performance, and a wide flow regulation range. It is typically installed on ventilation ducts to control the direction and flow of air to meet the needs of various applications.

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Ventilation Butterfly Valve Technical parameters

Size Range: DN50-DN4000

Material: WCB, Stainless Steel

Connection Options: Flanged End

Pressure: 0.05Mpa ~ 0.6Mpa

Working Temperature: -29°C to 425°C

Sealing Options: SS304 + Graphite

Applicable Medium: Gas, dust gases, flue gas

Ventilation Butterfly Valve Features

1. Simple Structure: The ventilation butterfly valve adopts a rotary valve disc structure, which is simple in structure and easy to manufacture and maintain.

2. Convenient Operation: The ventilation butterfly valve is easy to operate; simply rotating the valve disc is sufficient to open and close it.

3. Good Sealing Performance: The ventilation butterfly valve uses rubber or metal sealing rings for sealing, providing excellent sealing performance.

4. Wide Flow Adjustment Range: The ventilation butterfly valve has a wide flow adjustment range, which can be adjusted according to actual needs.

5. Strong Corrosion Resistance: The ventilation butterfly valve is usually made of stainless steel or carbon steel, exhibiting good corrosion resistance.

Ventilation Butterfly Valve Specification Parameters

Item	Specification
Nominal Diameter	DN (mm)	50 ~ 4000
Nominal Pressure	PN (MPa)	0.05	0.10	0.25	0.6
Test Pressure	Strength Test (MPa)	0.075	0.15	0.375	0.9
	Seal Test – Sealed (MPa)	0.055	0.11	0.275	0.66
	Seal Test – Non-Sealed	≤ 1.5% leakage
Applicable Medium	Gas, dust gases, flue gas, etc.
Drive Type	Manual, worm gear, pneumatic, electric transmission

Ventilation Butterfly Valve Main Components Material:

Part Name	Material
Body	Q235A, 16Mn steel, stainless steel
Disc	Q235A, 16Mn steel, stainless steel
Ring	Q235A, 16Mn steel, stainless steel
Stem	2Cr13, stainless steel
Packing	Flexible Graphite

Ventilation Butterfly Valve drawning

Ventilation Butterfly Valve Drawning

Ventilation Butterfly Valve Main Connection Dimensions:

DN (mm)	L	H	H0	0.05–0.1 MPa				0.25 MPa				0.6 MPa
DN (mm)	L	H	H0	D	D1	D2	n–d	D	D1	D2	n–d	D	D1	D2	n–d
100	127	105	486	210	190	144	4–18	210	190	144	4–18	210	170	144	4–19
125	140	120	516	240	200	174	8–18	240	200	174	8–18	240	200	174	8–19
150	140	132	541	265	225	199	8–18	265	225	199	8–18	265	225	199	8–19
200	152	160	779	320	280	254	8–18	320	280	254	8–18	320	280	254	8–19
250	165	187	836	375	335	309	12–18	375	335	309	12–18	375	335	309	12–19
300	180	220	901	440	395	363	12–22	440	395	363	12–22	440	395	363	12–23
350	180	245	954	490	445	413	12–22	490	445	413	12–22	490	445	413	12–23
400	200	270	1003	540	495	463	16–22	540	495	463	16–22	540	495	463	16–23
450	200	297	1058	595	550	518	16–22	595	550	518	16–22	595	550	518	16–23
500	220	322	1111	645	600	568	20–22	645	600	568	20–22	645	600	568	20–23
600	220	377	1233	755	705	667	20–26	755	705	667	20–26	755	705	667	20–26
700	240	430	1338	860	810	772	24–26	860	810	772	24–26	860	810	772	24–26
800	240	487	1452	975	920	878	24–30	975	920	878	24–30	975	920	878	24–31
900	260	537	1588	1075	1020	978	24–30	1075	1020	978	24–30	1075	1020	978	24–31
1000	260	587	1689	1175	1120	1078	28–30	1175	1120	1078	28–30	1175	1120	1078	28–31
1200	280	702	1938	1375	1320	1280	32–30	1375	1320	1280	32–30	1405	1340	1295	32–34
1400	300	782	2670	1575	1520	1480	36–30	1575	1520	1480	36–30	1630	1560	1510	36–37
1600	320	895	2810	1790	1730	1690	40–30	1790	1730	1690	40–30	1830	1760	1710	40–37
1800	340	995	3020	1990	1930	1890	44–30	1990	1930	1890	44–30	2045	1970	1918	44–40
2000	360	1095	3220	2190	2130	2090	48–30	2190	2130	2090	48–30	2265	2180	2125	48–43
2200	380	1200	3430	2405	2340	2295	52–33	2405	2340	2295	52–33	2475	2390	2335	52–43
2400	400	1310	3650	2605	2540	2495	56–33	2605	2540	2495	56–33	2685	2600	2545	56–43
2600	420	1420	3920	2805	2740	2695	60–33	2805	2740	2695	60–33	2905	2810	2750	60–49
2800	440	1530	4140	3030	2960	2910	64–36	3030	2960	2910	64–36	3115	3020	2960	64–49
3000	460	1640	4360	3230	3160	3110	68–36	3230	3160	3110	68–36	3315	3220	3160	68–49
3200	480	1760	4620	3430	3360	3310	72–36	3430	3360	3310	72–36	3525	3430	3360	72–49
3400	500	1870	4840	3630	3560	3510	76–36	3630	3560	3510	76–36	3735	3640	3560	76–49
3600	520	1980	5060	3840	3770	3720	80–36	3840	3770	3720	80–36	3970	3860	3720	80–56
3800	540	2120	5400	4045	3970	3920	80–39	4045	3970	3920	80–39	4180	4070	3970	80–62
4000	560	2230	5620	4245	4170	4120	84–39	4245	4170	4120	84–39	4380	4270	4170	84–62

Ventilation Butterfly Valve Working Principle

By rotating the valve plate (typically within the range of 0° to 90°), the flow area between the valve plate and the valve body is changed:

Fully Open: The valve plate is parallel to the airflow direction, resulting in minimal flow resistance and maximum flow rate.
Closed: The valve plate is perpendicular to the airflow direction, completely cutting off the flow.
Regulated: The valve plate is at the intermediate angle; flow rate is adjusted by changing the opening degree.

Ventilation Butterfly Valve Applications

Ventilation Systems: Such as factory ventilation, underground parking garage exhaust, tunnel ventilation, etc.
Air Conditioning Systems: Regulate fresh or return air flow to control indoor temperature and air quality.
Environmental Engineering: Gas flow regulation in flue gas desulfurization, denitrification, dust removal, and other systems.
Industrial Pipelines: Gas transmission pipelines in chemical, power, and metallurgical industries.
Fire Protection Systems: Used in conjunction with smoke exhaust valves or fire dampers for rapid closure in emergencies.

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