DN1200 High Performance Butterfly Valves , WCB Double Eccentric Butterfly Valve

The high performance double-eccentric butterfly valve can be used in working conditions and media for which conventional valves are suitable, and adopts different structure materials and special treatment materials according to different media. It can also be used in special working conditions such as cryogenic condition, steam, chlorine, oxygen, high vacuum, anti-corrosive condition, etc.

DBA8150	2”~60”	(DN50~1500)
DBA5150	21/2”~60”	(DN65~1500)
DFA8150	3”~60”	(DN80~1500)
DBA8300	2”~60”	(DN80~1500)
DBA5300	3”~60”	(DN80~1500)
DFA8300	3”~60”	(DN80~1500)

The series of high performance wafer type butterfly valves uses various structure materials, including those that meet NACE requirements and anticorrosive materials. Special valves that can be used in chlorine, oxygen, high vacuum, corrosive media and cryogenic condition are also available.

Features-Butterfly valves

The unique dynamic load seal PTFE seat design is adopted with good elasticity and high reliability.

Sealing can be maintained without the need of adding O ring or metal part.

The lip type sealing structure can compensate for the changes of temperature and pressure.

Long service life and low maintenance.

In seal test, there is no bubble and leakage at both directions.

► Seat type

PTFE, R-PTFE, PEEK, Fireproof seat, etc.

► Reliable fixing of shaft

The anti-blow-out structure is provided at the top of the shaft to prevent the shaft from running out of the gland in case of accidental breaking of the shaft.

► Convenient seat maintenance and servicing

The seat can be replaced just through removing the inserts without removing the inserts without the need of disassembling the butterfly valve and shaft.

► Provided with shut-off and control functions

Having excellent control characteristics

Proportional change of flow characteristic curve

Wide adjusting range

Tight sealing can be realized even when it is used for control.

Unique seat sealing structure–Butterfly valves

The traditional central line butterfly valve is lined with fluorin or rubber, but the S type elastic seal seat structure independently researched and developed by our company through introducing technology from Germany MAYER adopts the imported RPTFE material with good elasticity and long service life. It can automatically compensate for the changes of temperature and pressure and can realize compensation for the worn seal due to long-time opening, closing and use. It can realize double-direction sealing without leakage. It adopts flexible insert structure, and the maintenance is fast and convenient without the need of removing the butterfly plate and stem. The seal seat can be replaced and the sealing face can be repaired just through taking off the inserts at one side.

Seat sealing–Butterfly valves

►ANSIFCI 70-2 stipulated the control valve leakage level and test procedures. Among them VI level is the minimum leakage level. High performance wafer butterfly valve can achieve MSS-SP61 prescribed no bubble seal, higher than VI level.

►When the valve is closed, the butterfly plate makes the seat slightly deform. The deformation excites the seat. The excitation of the seat sealing face enables permanent sealing to be maintained between it and edges of the butterfly plate.

►When the inserts receive pressure, the pressure is exerted at the bottom of the lip edges, further enhancing the sealing force between the butterfly plate and seat.

►When the pressure is exerted at the non-insert side, the butterfly plate is pushed towards the seat. As the butterfly plate is of the ball shape, the further the butterfly plate is pushed towards the seat, the tighter the closing is. The lip edges contact the trough at the bottom of insert, limiting excessive movement of the seat.

Valve size table​–Butterfly valves

Size (DN)	Approximate size (mm)											Weight(kg)	National standard flange GB PN16
	A	B	C	E	G	H	K	P	S	X	Y*		D	N-Φ
50	43.3	23.3	96	38	124.3	279	80	186.3	7	24	50	3.2	Φ125	4-Φ18
65	49	27	119	59	194	279	111	275	11.2	14.8	48	5	Φ145	4-Φ18
80	49	27	132	73	203	279	121	316	11.2	14.8	74	6	Φ160	8-Φ18
100	54	30	157	95	216	279	133	341	11.2	14.8	97	8	Φ180	8-Φ18
125	64	30	186	111	217	279	135	362	11.2	14.8	111	12	Φ210	8-Φ18
150	57	33	216	142	235	279	152	378	14	18	146	13	Φ240	8-Φ23
200	64	39	270	188	270	559	187	441	15.9	21.9	194	2	Φ395	12-Φ23
250	71	41	324	236	329	559	232	530.6	20.6	28	243	35	Φ355	12-Φ25
300	81	48	381	282	357	559	260	595.5	23.8	33.3	289	51	Φ410	12-Φ25

Size (DN)	Approximate size (mm)															Weight (kg)	National standard flange GB PN16
	A	B	C	D	E	F	G	K	L1	L2	M	P	S	X	Y		D	N-Φ	L-M
350	92	52	413	476	314	413	425	315	1-1/8*	Φ29	0	710	28.5	37	318	82	Φ470	16-Φ26	4-M24
400	102	56	470	540	363	470	444	333	1-1/16*	Φ30	4	767	33.5	42	365	115	Φ525	16-Φ30	4-M27
450	114	67	533	578	414	533	466	355	1-3/16*	Φ33	4	812	41.5	47	416	156	Φ585	20-Φ30	4-M27
500	127	67	584	635	456	584	492	378	1-1/8~8+	M30	4	879	41.4	50	454	199	Φ650	20-Φ33	4-M30
600	154	76	692	749	549	692	610	480	1-1/4~8+	M33	4	1094	51	64	542	333	Φ770	20-Φ36	4-M33
650	164.6	86.5	749	806.5	549	749	620	480	1-1/4~8+	M33	4	1103	51	64	542	371
750	167	87	857	914	702	857	697	570	1-1/4~8+	M33	4	1307	51	66.8	711	594
800	190	87	905	977.9	702	905	697	570	1-1/4~8+	M39	4	1307	51	66.8	711	638	Φ950	34-Φ39	4-M36

Application​–Butterfly valves

Special working conditions​–Butterfly valves

►Steam working condition

The wafer type butterfly valves, including valves of PTFE seat with lower rated values and valves Peek seat, are suitable for steam working condition. The rated values of valves used as switch in the steam working condition are shown in the following table. The rated values may be decreased according to different shaft materials selected.

►Oxygen working condition

After special treatment, the valve can be used for shut-off and control in oxygen working condition. A series of strict procedures for spare parts preparation, assembly, teat and packing is followed to ensure cleanliness and avoid inherent danger caused due to reaction of oxygen with grease and other impurities.

►Vacuum working condition

Standard wafer type butterfly valves are rated for tight shut-off of vacuum 2X10^-2torr. Special high vacuum wafer valves can also be provided for vacuum of 2X10^-5 torr. In addition, high vacuum valves are confirmed to have a leakage rate of helium not exceeding 2X10^-5 CC/sec at vacuum of 2X10^-5 torr.

►Selection for high service life

The service life of valves assembly by spare parts such as reinforced PTFE shaft seal, PEEK-reinforced PTFE thrust bearing, etc. is much higher than that of ordinary valves. Certainly, the actual performances depend on the media, pressure and temperature and other conditions. It is the most ideal situation that the combination of oxygen, nitrogen, hydrogen, water and clean media is used.

Note: The working condition that contains acid, chlorine, bromine, sulfur dioxide, steam media with temperature exceeding 325°F(163℃) shall be avoided.

►Body rated value

The maximum working pressure of body and testing pressure of body of various materials are listed in the body pressure ratings table. The actual working pressure in the working conditions shall be decided according to the seat rated values.

Rated value of 150lb body (bar)
Temperature	Carbon steel	Ductile iron	Stainless steel	20# alloy	Monel
-20 to 38	19.7	17.2	19.0	15.8	15.8
93	17.9	16.2	16.5	13.8	13.8
149	15.8	14.8	14.8	12.4	13.1
204	13.8	13.8	13.4	11.0	12.8
260	11.7	11.7	11.7	10.3	11.7
Test Pressure	31	27.6	29.3	24.1	24.1

Rated value of 300lb body (bar)
Temperature	Carbon steel	Stainless steel	20# alloy	Monel
-20 to 38	51	49.6	41.4	41.1
93	46.5	42.7	35.9	36.5
149	45.2	38.6	32.1	34.1
204	43.8	35.5	29.0	33.1
260	41.4	33.1	26.9	32.8
Test Pressure	77.6	75.8	62	62