pneumatic piston 3-eccentric butterfly control valve

pneumatic piston 3-eccentric butterfly control valve

pneumatic piston 3-eccentric butterfly control valve

The first eccentric “a” of 3-eccentric structure is formed by the axle deviating from the central line of sealing surface. The second eccentric “b” is formed by the axle deviating from the central line of pipeline. The goal of these two eccentrics is to reduce the friction between seat and sealing surface. The third eccentric “c” is an eccentric angle β, which uses the cam effect to realize the no-friction contact between seat and sealing ring of disc during the 90° travel of valve, thus to avoid the probability of wear and leakage.; when closing the valve, the sealing pair will close gradually to cause “wedge effect” and to realize the tightest shut-off with the smallest torque.

1.One-body high rigidity hard surface seat can meet the application under many working conditions, providing long life and high quality.

2. Casted body and metal hard sealing is applicable to high temperature fluid (450°C--800°C).

3. Total metal structure plus zero leakage characterizes the “essential fire safety” property of valve.

4. Hard bearing, long structure and strengthened soft graphite bearing protective ring make the valve dustproof, tar-proof and block-proof, thus to increase the credibility of valve.

5. Mainly applicable to the control and shut-off of high and low temperature coal gas and air in metallurgy industry (such as heating furnace, coal gas station, blast furnace, convertor furnace and sinter) and light industry (such as glass heating furnace, anneal furnace)..

l Main technical data

Model		HB2416 pneumatic piston 3-eccentric butterfly control (shut-off) valve
DN(mm)		DN80~DN2400 (please contact us for DN2000 above)
PN		0.6Mpa, ANSI125		DN1400-2400
		1.6MPa ANSI150		DN80-1300
		4.0MPa ANSI300		DN200-800
Type of actuator		bsRT or hsAW pneumatic piston double (or single) action actuator (without or with spring return)
Air supply		400Kpa~700KPa
Allowable fluid temperature	Normal	≤200°C	Total metal hard sealing
	High temp. I	200~+450°C
	High temp. II	450~+580°C
	High temp.III	580~+690°C
	High temp. IV	690~+800°C
Rated stroke		0-90°
Ambient temperature		-20~80°C ( Note: If the working ambient temperature of accessories such as positioner or solenoid valve is lower than this temperature, the lowest working ambient temperature of accessories should be taken as the ambient temperature of whole machine, the product should be specially produced or configured if over 80°C.)
Inherent flow characteristics		Almost equal percentage
Rangeability		30:1
Material of parts		See the Breakdown Diagram of valve and Table of Material for parts