Three- Eccentric Hard Seal Butterfly Valve

• Media: Water, Gas, Oil, No-Corrosion Medium
• Driving Mode: Worm Gear Driven, Electric, Pneumatic
• Connection Form: Wafer, Flange
• Structure: Three-Eccentric Sealing
• Work Pressure: Low Pressure (Pn<1.6mpa)
• Working Temperature: -46 Degree to 550 Degree
• Model NO.: Three-Eccentric
• Material of Seal Surface: Metal Hard Sealed
• Valve Body: Casting
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Pn: 1.0MPa,1.6MPa
• Transport Package: Polywood Case
• Specification: D50-D2400
• Trademark: OEM&ODM
• Origin: China
• HS Code: 8481804090

Product Description

Triple 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: Triple Eccentric Hard Seal Butterfly Valve 
Model 1. Triple Offset Hard Seal Wafer Butterfly Valve 
Model 2. Triple Offset Hard Seal Flange Butterfly Valve 
Model 3. Triple Offset Metal Hard Seal Flange Butterfly Valve  

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/T19113,JB/T79			ASME\B16.5\B16.47
Inspection&Test		JB/T9092,GB/T13927			API598
NorminalPressure(MPa)		1.0	1.6	2.5	CLASS150	CLASS300	CLASS600
(MPa) Test Pressure	Shell Test	1.5	2.4	3.75	2.93	7.58	15.0
	High Pressure Seal Test	1.1	1.76	2.75	2.07	5.52	11.03
	Low Pressure Seal Test	0.6	0.6	0.6	0.6	0.6	0.6
Applicable Temperature		-46ºC-550ºC Different raw material for different work temperature
Applicable Medium		Water,oil,gas and other non-causticity medium(Different raw material for different medium)

Materials List(triole offset butterfly valve)

NO	Part Name	Materials	Optional Materials
1	Body	Cast Steel	SS,Monel
2	Pin	SS	SS,Monel
2a	Metalseat tongue	SS	Monel
3	Stem	SS	SS,Monel
4	Disc	Cast Steel	SS,Monel
5	Seal Ring	SS+SS+Graphite	PTFE+SS
6	Retainer Flange	Carbon Steel	SS,Monel
7	Bolt	B7	SS
8	Bolts	B7	SS
9	Cover	Carbon Steel	SS,Monel
10	Gasket	SS+SS+Graphite
11	Bushing	PTFE+Bronze	Luberized Bronze
12	Bushing	PTFE+Bronze	Luberized Bronze
13	Packing Seat	SS	SS,Monel
14	Packing	Graphite	PTFE
15	Bolts	B7	SS
16	Gland	SS	SS
17	Nut	2H	SS
18	Bolts	B7	SS
19	Yoke	Carbon Steel	-

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