Double Eccentric Flange Soft Seal Butterfly Valve

• Media: Water, Gas, Oil, No-Corrosion Medium
• Connection Form: Flange
• Structure: Double-Eccentric Sealing
• Working Temperature: -196 Degree to 550 Degree
• Valve Body: Casting
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Model NO.: Double Eccentric
• Transport Package: Polywood Case
• Specification: D50-D4000
• Trademark: OEM&ODM
• Origin: China
• HS Code: 8481804090

Product Description

Double eccentric sealed butterfly valve
The rotation center of disc (namely the center of valve shaft) and thecenterline ofbody form up a 'b' eccentric on the base of single eccentric butterfly valve. Makingthe sealing face of disc disengaged from seat sealing face more quickly than singleeccentric seal butterfly valves during the process of open and close. Once disc turnsto8° -12°. the disc sealing face will be completely disengaged from the seat sealingface. Once fully opened, a gap 'Y' will be formed up between the two sealing faces.This type of butterfly Valves are designed to have greatly lowered the mechanicalwear and extrusion deformation between the two sealing faces, making the sealingperformance of butterfly valve much better.
The characteristic of this structure is to make stem axis not only deviated from thecenter of disc. But also the center of the body. The effect of double eccentric is that,when valve has been opened, disc can be quickly disengaged from seat, thus togreatly eliminate the unnecessary excessive extrusion and scratch between the discand seat, reduce opening resistance, lower the abrasion and improve the service lifeof seat. As scratch has been greatly lowered, metal seat can be used for double eccentricbutterfly valve, so that butterfly valves are able to be used in high temperature fields.However, as its seal is positioned sealing construction ,i.e. The sealing faces discand seat is lineal contact, disc extruding seat to produce elastic deformation, thusto effect the sealing performance especially seat to produce elastic position, especiallyfor those with metal seat, and is given poor pressure endurance. This is why butterfly valves are, conventionally, not resistant to high temperature and leakage.

Product Name: Double Eccentric Sealed  Butterfly Valve 

No	Part Name	Materials	Optional Materials
1	Cover	Carbon Steel/Cast Iron	SS,Monel
2	Bolt	Alloy Steel	SS,Monel
3	Bushing	PTFE+Bronze	Luberized Bronze
4	Body	Ductile Iron/Gray Iron/Cast Steel	SS,Monel
5	Stem	2Cr13	SS,Monel
6	Disc	Cast steel	SS,Monel
7	Seal ring	NBR/EPDM	MBR/SS+MBR/SS+Graphite
7a	Seat	Carbon Steel+13Cr	SS,Monel
8	Packing	Graphite	PTFE
9	Bolt	Alloy Steel	SS,Monel
10	Gland	Carbon Steel	SS

 

Design Standard		GB/T12238					API609
Pressure-Temperature Rating		GB/T12224					API609,ASME B16.34
Face-Face		GB/T12221					API609.ISO5752.ASME B16.10
Flange Ends		GB/T9113,JB/T79					ASME\B16.5\B16.47
Inspection&Test		JB/T9092,GB/T13927					API598
NorminalPressure(MPa)		0.25	0.6	1.0	1.6	2.5	Class150	Class150	Class300
(MPa) Test Pressure	Shell Test	0.375	0.9	1.5	2.4	3.75	2.93	7.58	15.0
	High Pressure Seat Test	0.275	0.66	1.1	1.76	2.75	2.07	5.52	11.03
	Low Pressure Seat Test	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0.6
Applicable Temperature		-196ºC-550ºC Different raw material for different work temperature
Applicable Medium		Water,oil,gas and other non-causticity medium(Different raw material for different medium)