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D641H Pneumatic Flanged Hard-Sealing Butterfly Valve

D641H Pneumatic Flanged Hard-Sealing Butterfly Valve

  • Model:D641H-0.5C/D641H-1C/D641H-2.5C/D641H-6C/D641H-0.5P/D641H-1P/D641H-2.5P/D641H-6P
  • Specification:DN50-DN2000
  • Temperature:≤ 425℃
  • Medium:Water, steam, oil products
  • Pressure:PN0.5~PN6
  • Connection method:Flange
  • Driving method:Pneumatic
  • Material:Carbon steel, stainless steel
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D641H Pneumatic Flanged Hard-Sealing Butterfly ValveOverview

D641H pneumatic ventilation butterfly valve is a non-sealing type butterfly valve specially designed for flow regulation and shut-off of media such as air, flue gas, and dust-containing gases under low-pressure and large-diameter working conditions. The valve adopts a steel plate welded structure and is matched with a high-precision pneumatic actuator, enabling automated remote control in industrial piping networks. Its core design philosophy lies in being "lightweight, temperature-resistant, and low-resistance," and it is widely used in ventilation and dust removal systems, environmental treatment projects, and flue gas desulfurization and denitrification systems in metallurgy, chemical, power, building materials, and municipal engineering.

Product Image of D641H Pneumatic Flanged Hard-Sealing Butterfly Valve

D641H Pneumatic Flanged Hard-Sealing Butterfly ValveCharacteristic


1.Simplified structure and lightweight

Made of high-quality welded steel plates, its face-to-face length is extremely short and its volume is small compared to traditional flanged gate valves or globe valves. This significantly reduces the load on pipe supports and makes installation and maintenance extremely convenient.

2.Flexible operation and low flow resistance

The valve disc adopts a streamlined design, and the opening angle has a linear relationship with the flow rate. Due to the wide flow passage inside the valve body, the pressure loss when the medium flows through is minimal, making it very suitable for low-pressure, large-volume ventilation systems.

3.High temperature resistance and long service life

The sealing pair adopts a metal-to-metal (hard seal) structure with a small clearance maintained between the valve seat and the disc. This design effectively avoids jamming during opening and closing caused by high-temperature expansion, and it can withstand operating environments of 425°C or even higher (depending on the material).

4.Highly efficient pneumatic actuation

Equipped with high-performance pneumatic actuators (double-acting or single-acting), it supports 4-20mA signal adjustment (after installing a positioner) with fast response speeds. It can achieve rapid shut-off or precise regulation in harsh environments.

5.Strong environmental adaptability

A wide range of valve body materials is available, including carbon steel (WCB), stainless steel (304/316L), and duplex steel. For flue gas or dust containing corrosive components, targeted material reinforcement can be performed to ensure stability in complex working conditions.

D641H Pneumatic Flanged Hard-Sealing Butterfly Valvestructure principle

Structural Drawing of D641H Pneumatic Flanged Hard-Sealing Butterfly Valve


List of Component Names and Materials

Part NameCommon Materials
Body, BaseCarbon steel, Stainless steel
Butterfly PlateCast steel, Stainless steel, Cr-Ni-Mo-Ti steel, Cr-Mo-Ti steel and other special materials
Valve SeatStainless steel
Valve StemCarbon steel, 2Cr13, Stainless steel, Cr-Ni-Mo-Ti steel
PackingV-type PTFE packing, Flexible graphite packing


D641H Pneumatic Flanged Hard-Sealing Butterfly Valvetechnology parameter

Performance Specification Sheet

Performance Specification Table
Nominal Pressure0.050.10.250.6MPa
Strength Test Pressure0.750.150.3750.9
Seal Test Pressure0.0550.110.2750.66
Applicable Temperature≤425

Standard requirements for external dimensions

1. The structural length of the valve shall comply with the standard of GB/T12221

2. Connecting flanges according to GB/T17241.6 standard


D641H Pneumatic Flanged Hard-Sealing Butterfly Valvestandard size

Standard requirements for external dimensions

1. The structural length of the valve shall comply with the standard of GB/T12221

2. Connecting flanges according to GB/T17241.6 standard

Outline Drawing of D641H Pneumatic Flanged Hard-Sealing Butterfly Valve

Outline dimension table

Nominal Diameter DN (mm/inch)Structural Length LHH0AB0.25MPa (D/D1/D2/Z-d)0.6MPa (D/D1/D2/Z-d)
50 / 210870286125193140/110/88/4-14140/110/88/4-14
65 / 2 1/211280306125193160/130/108/4-14160/130/108/4-14
80 / 311495334125193190/150/124/4-18190/150/124/4-18
100 / 4120105354125193210/170/144/4-18210/170/144/4-18
125 / 5120120384125193240/200/174/8-18240/200/174/8-18
150 / 6120132409125193265/225/199/8-18265/225/199/8-18
200 / 8140160593165183320/280/254/8-18320/280/254/8-18
250 / 10140187650165283375/335/309/12-18375/335/309/12-18
300 / 12170220715165283440/395/363/12-22440/395/363/12-22
350 / 14170245814175334490/445/413/12-22490/445/413/12-22
400 / 16190270863175334540/495/463/16-22540/495/463/16-22
450 / 18190297918175334595/550/518/16-22595/550/518/16-22
500 / 201903221016210425645/600/568/20-22645/600/568/20-22
600 / 242103771128210425755/705/667/20-26755/705/667/20-26
700 / 282104301233210425860/810/772/24-26890/810/772/24-26
800 / 322104871344210425975/920/878/24-30975/920/878/24-30
900 / 3625053715603206201075/1020/978/24-301075/1020/978/24-30
1000 / 4025058716603206201175/1120/1078/28-301175/1120/1078/28-30
1200 / 4825068718903206201375/1320/1280/32-301405/1340/1295/32-33
1400 / 5630076026705757141575/1520/1480/36-301630/1560/1510/36-36
1600 / 6430089528105757141790/1730/1690/40-301830/1760/1710/40-36
1800 / 7230099520205757141990/1930/1890/44-302045/1970/1918/44-39
2000 / 80300109532206568102190/2130/2090/48-302265/2180/2125/48-42