Worm Gear Ventilation Butterfly Valve

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

Size Range: DN100-DN4000

Connection Options:Flanged

Working Pressure:Up to 300 psi (20.7 bar)

Working Temperature:-29°C to 200°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 ventilation butterfly valve is a low-pressure flow control device specifically designed for air and gas duct systems in HVAC, dust collection, and industrial ventilation applications. Unlike standard sealing valves, these valves focus on regulating large volumes of air with minimal flow resistance. They are commonly constructed with lightweight materials, wide-diameter discs, and optional sealing structures depending on application needs.

Product Features

◇ Uses and Characteristics

This butterfly valve adopts the same material processing for the valve chest and sealing packing collar. It can be operated electrically or pneumatically. The material is selected based on the operating temperature. The nominal pressure is ≤ 0.6 MPa. It is generally used in industrial ventilation systems such as metallurgy, mining, cement, chemical industry, environmental protection, and other pipeline networks for ventilation and regulating flow.

Main features include:

Novel structure, reasonable layout, compact and lightweight design, fast operation.
Small torque requirement, easy operation, and intelligent control.
Material selection varies depending on temperature and medium, applicable for low, medium, and high temperatures, as well as corrosive media.

◇ Standards

Item	Standard
Design Standards	GB/T 12238–1989
Flange Size	GB/T 9113
Structure Length	GB/T 12221–1989
Pressure Test	GB/T 13927–92; JB/T 9092–1999

◇ Main Performance Specifications

Nominal Diameter DN (mm)	50 – 4000
Nominal Pressure PN (MPa)	0.05	0.10	0.25	0.6
Strength Test	0.075	0.15	0.375	0.9
Seal Test (Sealed Type)	0.055	0.11	0.275	0.66
Seal Test (Non-Sealed Type)	–	–	–	≤ 1.5% leakage

Applicable Medium:
Coal gas, mixed gas, flue gas, and other gas media.

Drive Types:
Manual, worm gear, pneumatic, electric.

◇ Main Components Material

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

Specification Parameters

◆ Main Connection Dimensions

DN (mm)	L	H	H₀	0.05–0.1MPa				0.25MPa				0.6MPa
				D	D1	D2	n–φd	D	D1	D2	n–φd	D	D1	D2	n–φd
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	285	254	8–18	320	285	254	8–18	320	285	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	240	327	1111	645	600	568	20–22	645	600	568	20–22	645	600	568	20–23
600	260	382	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	280	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	280	602	1689	1180	1120	1078	28–30	1180	1120	1078	28–30	1180	1120	1078	28–31
1200	280	702	1938	1375	1320	1280	32–30	1375	1320	1280	32–30	1375	1320	1280	32–34
1400	280	782	2670	1570	1520	1460	36–30	1570	1520	1460	36–30	1630	1580	1460	36–37
1600	320	895	2810	1790	1730	1690	40–30	1790	1730	1690	40–30	1830	1760	1710	40–37
1800	320	980	3092	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	360	1220	3430	2405	2340	2295	52–33	2405	2340	2295	52–33	2480	2390	2335	52–43
2400	360	1350	3650	2605	2540	2495	56–33	2605	2540	2495	56–33	2685	2605	2545	56–43
2600	420	1420	3920	2805	2740	2695	60–35	2805	2740	2695	60–35	2910	2810	2750	60–49
2800	420	1530	4140	3030	2960	2910	64–36	3030	2960	2910	64–36	3155	3020	2960	64–49
3000	460	1640	4360	3230	3160	3110	68–36	3230	3160	3110	68–36	3315	3220	3160	68–49
3200	460	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	500	2000	5086	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

Specification Applications

Industries

Water Treatment Plants: Used in water distribution and control systems for potable and wastewater treatment.
Oil & Gas Industry: Suitable for regulating the flow of crude oil, natural gas, and refined products.
Chemical Industry: Ideal for controlling the flow of chemicals, acids, and other aggressive fluids.
HVAC Systems: Commonly used in heating, ventilation, and air conditioning systems for regulating air or water flow.
Food & Beverage Industry: Suitable for sanitary and non-sanitary applications that require frequent operation and cleaning, thanks to corrosion-resistant materials and ease of cleaning.

Specific Applications

Cooling Water Systems: Controls the flow of water for cooling applications in industrial facilities.
Fire Protection Systems: Used in fire sprinkler systems as control valves to regulate water supply.
Process Pipelines: Ideal for modulating or isolating flow in pipelines carrying oil, gas, or chemicals.
Air Flow Regulation: Used in HVAC systems to regulate air flow, ensuring efficient operation of heating and cooling units.

Installation Instructions

Verify the valve size, pressure rating, and material compatibility with the pipeline and medium before installation.
Ensure proper alignment of the butterfly valve in the pipeline to avoid seat or disc damage.
Use appropriate flange gaskets and follow standard torque tightening procedures for flanged connections.
For wafer or lug connections, ensure correct bolt alignment to avoid stress on the valve body.
Test the valve for proper operation to ensure the disc moves freely without obstruction. If the disc does not move freely, check for proper alignment and inspect for debris that may be causing the obstruction. If issues persist, further troubleshoot by adjusting alignment or cleaning the valve thoroughly to remove any contaminants.

Valve Actuation

Process Optimization

Precision Engineering

Pipeline Solutions

Industrial Valves

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