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Outline

The 70E Series high performance butterfly valve adopts the design of double-eccentric structure. The shaft carries out double deviation from the structural center of the body and makes the disc leave the sealing seat instantly when it is opened in conjunction with the arc sealing face design of the disc. So as to reduce the friction of the sealing face. The disc has good sealing performance during closing. In addition to realizing effective compensation for the seat seal, the central self-positioning sealing seat structure design and the unique seat compensation sealing design reduce the friction during opening and closing, greatly reduce the operating force of the valve and effectively enhance the control precision of the butterfly valve. The 70E Series butterfly valve is Featured by stable and reliable sealing performance, long service life, etc. It is suitable for control and shut-off applications of common corrosive gases and liquid media.

Actuator and auxiliary control device

·Pneumatic

·Electric

·Pneumatic-hydraulic

·Worm gear

Application

·Air separation, chemical industry, petroleum

·Chemical fiber, electric power, metallurgy

·Pharmacy, environmental protection

Manufacturing range

·Size range:      DN"2"～48"

·Pressure rating:  150～300LB

·Connection type:  wafer type, flange type

Parameters of control valves

·Trim features:  double-eccentric structure, Compensation type sealing seat, Valve disc arc surface

·Body type:  straight-through type

·Bonnet type:  standard integral type

·Flow characteristic:  approximately equal percentage

·Shut-off class:   ASME B16.104 VI (standard seat),    ASME B16.104 IV (metal seat)

·Pipe connection type:  wafer type, flange type

·Applicable temperature range:  -45℃~250℃

·Actuator type:  pneumatic piston actuator,  electric actuator

Structural drawing of 70E Series

Materials of 70E Series

Number	Name	Material
1	Stem	17-4PH Stainless Steel ASTM A564 Gr630 Optional:316ss,inconel718/625, Monel
3	Packing	PTFE Optional:Graphite-high density/low density
4	Front bearing	316SS Backed PTFE, hastelloy C Backed Ptfe
5	Cover plate	Optional:316ss, ALLOY20
8	Body	Carbon Steel A216 Gr WCB Or A105 Optional：ASTMA351CF8MOr A182F316
9	DISC	Carbon Steel A216 Gr WCB Or A105+Surfacing SS Optional：316ss, ASTMA351CF8MOr A182F316 Monel,Alloy20,AluminumBronze,HastelloyC
11	Limit part	17-4PHStainlessSteel ASTMA564Gr630 Optional：A182F316/F304
14	Side seal ring	NBR Or VITON Optional:316ss
15	Seat	R.TFE.F Optional: R.TFE.C

Outline

The double-eccentric design of the70E Series butterfly valve reduces the abrasion of the seat and ensures the double-way tightness function within the whole pressure range. Taking the seat as the starting point, the eccentric disc produces a function similar to that of the cam and the disc can be pulled to leave the seat without the need of using too high operating force. The function of the disc similar to that of the cam at the starting position reduces the abrasion of the seat and reduces the deformation of the seat. When the valve is opened , the disc will instantly leave the seat, and when the valve is closed, the function similar to that of the cam turns the rotary movement of the valve into linear motion, so as to effectively push the disc to contact the seat. The built-in compensation spring can effectively compensate for the abrasion of the sealing seat and enable the sealing seat to be elastic during the opening and closing process, greatly reduce friction ,enhance sensitivity and make the whole valve have excellent shut-off and control  functions.

Seat design

The 70E Series provides various types of seat structures:

1. The seat adopts the internally opened U groove structure .Self sealing is realized through medium pressure . The built-in compensation spring makes the sealing structure realize real dynamic sealing through the medium pressure in the system .Seat leakage: under CV*10%.

2. These at adopts externally opened O ring groove structure . When the disc is not completely closed, the seat has certain radial flexibility so that the seat abrasion is reduced and the torque is lowered. When the disc is closed, the pre-tightening force of the sealing face of the disc is offered to ensure sealing. Seat leakage: under CV*10-6%.

 

Body size

Valve size (DN)	Class150LB		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

Rated CV valve and travel

Valve Size		Rated CV valve	Valve Size		Rated CV valve
inch	mm	90°Opening	inch	mm	90°Opening
3	80	178	18	450	11314
4	100	430	20	500	14870
5	125	458	24	600	21450
6	150	1010	28	700	30515
8	200	2710	32	800	41603
10	250	3440	36	900	54193
12	300	4950	40	1000	56920
14	350	6485	48	1200	77390
16	400	8525	--	--	--