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Outline

The 70D Series three-eccentric hard seal butterfly valve adopts the design of three-eccentric structure. There is no friction between the disc and seat within the full travel range of disc opening and closing ,so that the leakage caused due to seat abrasion during seat opening and closing in rotary control valves is eliminated. The seat adopts the multi-level structure and uses the combination of metal and nonmetal materials to form the sealing face. It can work excellently under the service conditions of high temperature and low temperature. The 70D Series butterfly valve is featured by long service life and excellent sealing performance. It is suitable for control and shut-off applications of almost all gases and liquids in the industrial process control. Industrial.

Actuator and auxiliary control device

·Pneumatic

·Electric

·Pneumatic-hydraulic

·Worm gear

Applications

·Air separation, chemical industry, petroleum

·Chemical fiber, electric power, metallurgy

·Pharmacy, environmental protection

Manufacturing range

·Size range:       DN2"-48"

·Pressure rating:   150 - 600LB

·Connection type:  wafer type, flange type

Parameters of control valves

·Trim features:  three-eccentric structure, multi-level sealing seat, hard seal

·Body type:  straight-through type

·Bonnet type:  standard integral type

·Flow characteristic:  approximately equal percentage

·Shut-off class:  ASME B16.104 VI

·Pipe connection type:  wafer type, flange type

·Applicable temperature range:  -196℃~530℃

·Actuator type:  pneumatic piston actuator, electric actuator

Structural drawing of 70D Series

·flange type

·wafer type

Materials of 70D Series

Number	Name	Material
1	Stem	17-4PH Stainless Steel ASTM A564 Gr630 Optional:316ss,inconel 718/625, Monel
3	Packing	PTFE Optional: Graphite-high density/low density
4	Front bearing	316SS Backed PTFE, hastelloy C Backed PTFE
5	Body	Carbon Steel A216 Gr WCB Or A105 Optional：ASTMA351CF8MOr A182F316
8	Disc	Carbon Steel A216 Gr WCB Or A105+Surfacing SS Optional：316ss, ASTM A351 CF8M Or A182 F316 Monel,Alloy20,Aluminum Bronze, Hastelloy C
9	Cover plate	Optional:316ss, ALLOY20
11	Limit part (flange type)	17-4PH Stainless Steel ASTM A564Gr630 Optional：A182 F316/F304
	Split collar (wafer type)
14	seal ring	Graphite+304 Optional :PTFE
15	Seat	316SS ASTM A351 CF8M Or A182 F316 Monel,Alloy20,Aluminum Bronze ,Hastelloy C

Three-eccentric design

·The use of the metal hard seal under no disturbance can provide longer service life.

·The first eccentricity is that the stem Deviates from the edge of the disc to ensure the sealing face will not be broken by the stem.

·The second eccentricity is that the center of the stem deviates to one side of the body center. When the disc leaves the seat, the disc turns to realize the function similar to that of the cam. When the disc enters the closing status, the disc movement is turned by the function similar to that of the cam into linear motion. During the whole movement process, the disc edge always makes

no contact with the seat.

·The third eccentricity is formed by the seal parts and two tapered seats in which the rotary central shaft and valve center form the conical angle. The deviation of the two cones(forming the conical angle relative to the valve center)  enables the disc to leave the seat more easily. This kind of “overlapped cone” design enables the disc to leave the seat instantly when the valve is opened. The seat is only contacted when thevalve is closed, and mutual disturbance between the disc and seal is eliminated.

Body size

Valve size   (DN)	Class 150LB		H1	H2	H3	H4	A	B	M	ΦD	C x C	E
	L1	L2
3"  DN80	48	114	122	270	70	20	90	40	M10	20	17x17	--
4"  DN100	54	127	132	292	70	20	90	40	M10	20	17x17	--
5"  DN125	57	140	144	314	70	20	90	40	M10	20	17x17	--
6"  DN150	57	152	164	350	70	20	90	40	M10	20	17x17	--
8"  DN200	64	152	202	422	80	25	110	40	M12	28	22x22	--
10"  DN250	71	165	245	525	85	30	130	50	M14	32	26x26	--
12"  DN300	81	178	272	562	85	30	130	50	M14	36	28x28	--
14"  DN350	92	190	313	643	95	35	142	55	M20	42	34x34	--
16"  DN400	102	216	343	703	95	35	142	55	M20	48	40x40	--
18"  DN450	114	222	364	744	100	40	170	80	M24	50	38x38	--
20"  DN500	127	229	394	814	100	40	170	80	M24	50	38x38	--
24"  DN600	154	267	449	934	120	50	184	98	M27	65	54x54	--
28"  DN700	165	292	490	1000	120	50	184	98	M27	75	54x54	--
32"  DN800	190	318	545	1125	160	60	268	105	M27	85	--	22
36"  DN900	203	330	603	1255	160	60	268	140	M30	90	--	25
40"  DN1000	216	410	675	1395	160	60	268	140	M30	100	--	28
48"  DN1200	254	470	870	1450	160	70	268	140	M30	100	--	28

High pressure body

Valve size(DN)		300LB		600LB
		L1	L2	L1	L2
4"	DN 100	54	127	64	190
6"	DN 150	59	140	76	210
8"	DN 200	73	152	89	230
10"	DN 250	83	165	114	250
12"	DN 300	92	178	114	270
14"	DN 350	117	190	127	290
16"	DN 400	133	216	140	310
18"	DN 450	146	222	152	330
20"	DN 500	159	229	152	350
24"	DN 600	181	267	178	390