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BD343H Flange Type Multi-level Metal Hard Seal Insulation Butterfly Valve

BD343H flange multi-level metal hard seal insulation butterfly valve, also known as jacket butterfly valve, is a type of butterfly valve that is welded with a metal jacket on the outside of the valve body on the basis of a regular triple eccentric metal hard seal butterfly valve. There are jacket interfaces on both sides of the insulation butterfly valve body, which can contain steam or other superheated gases to prevent the medium from solidifying or crystallizing at room temperature. The flange of the temperature butterfly valve is one to two specifications larger than that of ordinary metal hard sealed butterfly valves, mainly used in various systems such as petroleum, chemical, metallurgical, pharmaceutical, etc. The sealing principle of the metal sealed triple eccentric butterfly valve utilizes an eccentric structure, achieving almost no friction between the disc and the valve seat during valve opening and closing. The torque of the valve stem is directly transmitted to the sealing surface through the disc, thereby eliminating the common jumping phenomenon when opening ordinary valves. This means that the eccentric butterfly valve can almost enter the adjustable area from 0 degrees to 90 degrees. Its normal regulation ratio is more than twice that of a regular butterfly valve, and the regulation ratio can be as high as 100:1 or more. This creates favorable conditions for the use of eccentric butterfly valves as control valves. Metal sealing can be used in media with slight particles and slurry, with a suitable temperature of up to 425 ℃ and a maximum pressure of 6.4 MPa. There is almost no friction during sealing, ensuring less torque and better sealing performance. The flange is suitable for various standards for clamping hole connections.

Product performance parameters:

1) Adopting a three-dimensional eccentric structure, the valve seat and butterfly plate have almost no friction, and have a tighter sealing function and compensatory wear of the sealing pair.

2) The sealing ring is a soft and hard layered metal sheet, which has the dual advantages of metal sealing and elastic sealing.

3) The sealing surface is made of Dui Si Tai Li hard alloy, which is wear-resistant and has a long service life.

4) By selecting different materials, it has excellent sealing performance under low temperature, high temperature, and high pressure conditions, and can be manufactured into a bi-directional sealing type.

5) Multiple transmission devices can be provided according to user requirements. 6. Electric butterfly valves can be manually or remotely controlled on site, and can meet the needs of computer programming technology.

Product features:

1) Triple Eccentricity Structure: The valve stem axis is offset by a dimension A from the sealing surface of the disc and offset by a dimension B from the valve body channel axis. The valve seat rotation axis forms an eccentricity angle a from the valve body channel axis, thus forming three eccentricities. When the butterfly valve is opened from 0 to 90, the sealing surface of the butterfly plate will immediately detach from the valve seat surface at the moment of opening. When it is closed from 90 to 0, only at the moment of closing will the sealing surface of the disc come into contact and press against the valve seat surface. However, the sealing pressure can be adjusted arbitrarily by applying a driving torque. So there is no friction between the sealing surface on the valve seat and disc, eliminating the possibility of wear and leakage.

2) Truss type butterfly plate structure: The butterfly plate has high strength, large over current area and low flow resistance.

3) Torque sealing: When the triple eccentric structure of the butterfly valve closes, the sealing pressure between the two sealing surfaces of the sealing pair is generated by the driving torque applied to the valve stem. Not only does it eliminate the reduction and disappearance of sealing specific pressure caused by aging, cold flow, and elastic failure of conventional elastic valve seat materials, but it can also achieve arbitrary adjustment of its sealing specific pressure through changes in the external and central driving torque, thereby improving the sealing performance of the three eccentric butterfly valve and greatly improving its service life.

4) Soft and hard laminated metal sealing structure: The butterfly plate sealing ring adopts a combination of soft and hard laminated stainless steel sheets and flexible graphite, which gives it the dual advantages of metal hard sealing and elastic sealing. It has excellent sealing performance in both low and high temperature working conditions.

5) Bidirectional sealing: As the cone angle of the sealing surface is smaller than the friction angle of the sealing material, the butterfly plate immediately realizes self-locking when it is closed to the sealing position and can withstand a certain amount of reverse pressure impact.

6) Fireproof structure: The all metal structure itself has the characteristics of fire safety.

7) BD343H, BD343Y, BD343Y metal sealed butterfly valve body sealing surface: Made of hard alloy or stainless steel for high strength, good hardness, and wear resistance. It can be opened and closed continuously for more than 600000 times without damage.

8) Sealing ring: The sealing ring is clamped onto the butterfly plate by a pressure plate, making it easy to install, adjust, and replace. The upper and lower parts of the valve stem are equipped with shaft sleeves to prevent wear and adhesion, thereby improving the service life.

Product external structural size:

Nominal diameter DN（mm）		Structural length		External dimensions (reference value)										Connection size (standard value)）
Nominal diameter DN（mm）		L		H	BDd343H			BDd643H			BDd943H			PN0.6MPa			PN1.6MPa
mm	inch	Width	Length	H	H1	A1	B1	H2	A2	B2	H3	A3	B3	D	D1	Z-d	D	D1	Z-d
50	2	108	150	112	350	180	200	625	245	72	530	250	255	140	110	4-14	165	125	4-18
65	21/2	112	170	115	370	180	200	625	245	72	530	250	255	160	130	4-14	185	145	4-18
80	3	114	180	120	380	180	200	645	245	72	565	250	255	190	150	4-18	200	160	8-18
100	4	127	190	138	420	180	200	675	355	92	600	250	255	210	170	4-18	220	180	8-18
125	5	140	200	164	460	180	200	715	355	92	640	250	255	240	200	8-18	250	210	8-18
150	6	140	210	175	555	270	280	800	355	92	705	300	315	265	225	8-18	285	240	8-22
200	8	152	230	200	760	400	425	850	250	170	775	300	315	320	280	8-18	340	295	8-22
250	10	165	250	243	830	400	425	925	250	170	945	300	315	375	335	12-18	365	350	12-22
300	12	178	270	250	895	450	560	1035	450	220	1070	300	315	440	395	12-22	445	400	12-22
350	14	190	290	280	950	450	560	1070	450	220	1140	300	315	490	445	12-22	505	460	16-22
400	16	216	310	305	1190	535	580	1190	450	220	1210	300	315	540	495	16-22	565	515	16-22
450	18	222	330	350	1255	535	580	1250	650	280	1335	575	714	595	550	16-22	615	565	16-26
500	20	229	350	380	1305	535	580	1290	650	280	1415	575	714	645	600	20-22	670	620	20-26
600	24	267	390	445	1340	570	660	1455	850	380	1605	656	810	755	705	20-26	780	725	20-26
700	28	292	430	480	1520	750	550	1585	850	380	1844	656	810	860	810	24-26	895	840	20-30
800	32	318	470	530	1710	750	550	1700	1250	380	2040	656	810	975	920	24-30	1015	950	24-30
900	36	330	510	580	1810	750	550	1965	1250	380	2255	785	863	1075	1020	24-30	1115	1050	24-33
1000	40	410	550	650	1960	900	750	2015	1250	380	2380	785	863	1175	1120	28-30	1230	1160	28-33
1200	48	470	630	760	2250	1000	925	2250	1250	380	2640	785	863	1405	1340	32-33	1455	1380	28-36
1400	56	530	710	850	2435	1000	925				2886			1630	1560	36-36	1675	1590	32-39
1600	64	600	790	1030	2780	1000	925				3156			1830	1760	40-36	1915	1820	36-42
1800	72	670	870	1230	3020	1100	980				3421			2045	1970	44-39	2115	2020	40-48