B2F Double-Flange Limiting Expansion Joint

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Pipe Expansion Joints

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Technical Specifications for B2F Type (VSSJA-2) Double-Flange Limiting Expansion Joints

Product Introduction

The B2F type (VSSJA-2) double-flange limit expansion joint is developed on the basis of the VSSJA flange expansion joint.

The B2F type (VSSJA-2) double-flange limit expansion joint operates by connecting to equipment such as valves or flanges on both sides of the joint. Its working principle involves adding a short limiting flange pipe and using extended bolts to securely connect the joint to the limiting device. At the maximum expansion/contraction point, the dimensions are locked with nuts, allowing the pipeline to expand and contract freely within the permissible range. While protecting the pipeline and associated equipment, this design also facilitates future installation, removal, and maintenance. It is suitable for applications involving thermal expansion and contraction of pipelines, uneven foundation settlement, pipelines with a certain degree of slope, bends, or those subjected to significant vibration.

Users can select the expansion joint product that best suits their specific application needs.

Suitable for connecting pipelines conveying water, oil, gas, slurries, and particulate media.

This product complies with the technical requirements of GB/T12465-2017.

Structure and Material

Note: For VSSJA-2 double-flange limit expansion joints with a nominal diameter greater than DN300, it is recommended to use steel structural components as a whole. If there are specific material requirements (e.g., stainless steel, etc.), please specify in advance.

Technical Parameters of B2F Type (VSSJA-2) Double-Flange Limiting Expansion Joints (PN 0.6, 1.0 MPa)

Nominal Diameter Nominal Dia.DN	Pipe outer diameter Pipe O.D. Dw	External dimensions Overall Dimension		Expansion amount Linear Movement △L	Flange Connection Dimensions Flange Connection Dimension
		External dimensions Overall Dimension			0.6MPa			1.0MPa
		L	L1		D	D1	n-do	D	D1	n-dO
65	76	340	105	50	160	130	4-φ14	185	145	4-φ18
80	89				190	150	4-φ18	200	160	8–φ18
100	108				210	170		220	180
100	114				210	170		220	180
125	133				240	200	8–φ18	250	210
125	140				240	200		250	210
150	159				265	225		285	240	8-φ22
150	168				265	225		285	240
200	219				320	285		340	295
250	273				370	335	12-φ18	395	350	12-φ22
300	325	350	130	65	440	395	12-φ22	445	400	12-φ22
350	377				490	445	12-φ22	505	460	16-φ22
400	426				540	495	16-φ22	565	515	16–φ26
450	480				595	550	16-φ22	615	565	20–φ26
500	530				645	600	20–φ22	670	620	20–φ26
600	630				755	705	20–φ26	780	725	20–φ30
700	720				860	810	24-φ26	895	840	24–φ30
800	820	590	220	130	975	920	24–φ30	1015	950	24-φ33
900	920				1075	1020	24–φ30	1115	1050	28–φ33
1000	1020				1175	1120	28–φ30	1230	1160	28–φ36
1200	1220				1405	1340	32–φ33	1455	1380	32–φ40
1400	1420				1630	1560	36–φ36	1670	1590	36–φ42
1500	1520				1730	1660	36–φ36	-	-	-
1600	1620				1830	1760	40–φ36	1915	1820	40–φ48
1800	1820				2045	1970	44–φ40	2115	2020	44–φ48
2000	2020				2265	2180	48–φ42	2325	2230	48–φ48
2200	2220				2475	2390	52–φ42	2550	2440	52–φ56
2400	2420				2685	2600	56–φ42	2760	2650	56–φ56
2600	2620	600	240	150	2905	2810	60–φ48	2960	2850	60–φ56
2800	2820				3115	3020	64–φ48	3180	3070	64–φ56
3000	3020				3315	3220	68–φ48	3405	3290	68–φ60
3200	3220				3525	3430	72–φ48	3635	3510	72–φ60
3400	3420				3735	3640	76–φ48	3865	3730	76–φ60
3600	3620				3970	3860	80–φ56	4005	3890	90–φ60

Technical Parameters of B2F Type (VSSJA-2) Double-Flange Limiting Expansion Joints (PN 1.6, 2.5 MPa)

Nominal Diameter Nominal Dia.DN	Pipe outer diameter Pipe O.D. Dw	External dimensions Overall Dimension		Expansion amount Linear Movement △L	Flange Connection Dimensions Flange Connection Dimension
		External dimensions Overall Dimension			1.6MPa			2.5MPa
		L	L1		D	D1	n-do	D	D1	n-do
65	76	340	105	50	185	145	4-φ18	185	145	8–φ18
80	89				200	160	8–φ18	200	160	8–φ18
100	108				220	180		235	195	8-φ22
100	114				220	180		235	195	8-φ22
125	133				250	210		270	220	8-φ26
125	140				250	210		270	220
150	159				285	240	8-φ22	300	250
150	168				285	240	8-φ22	300	250
200	219				340	295	12-φ22	360	310	12-φ26
250	273				405	355	12-φ26	425	370	12-φ30
300	325	350	130	65	460	410	12-φ26	285	430	16–φ30
350	377				520	470	16–φ26	555	490	16-φ32
400	426				580	525	16–φ30	620	550	16–φ36
450	480				640	585	20–φ30	670	600	20–φ36
500	530				715	650	30–φ33	730	660	20–φ36
600	630				840	770	20–φ36	845	770	20–φ39
700	720				910	840	24-φ36	960	875	24-φ42
800	820	590	220	130	1025	950	24–φ40	1085	990	24-φ48
900	920				1125	1050	28–φ40	1185	1090	28–φ48
1000	1020				1255	1170	28–φ42	1320	1210	28–φ56
1200	1220				1485	1390	32–φ48	1530	1420	32–φ56
1400	1420				1685	1590	36–φ48	1755	1640	36–φ62
1600	1620				1930	1820	40–φ56	1975	1860	40–φ62
1800	1820				2130	2020	44–φ56	2195	2070	44–φ70
2000	2020				2345	2230	48–φ62	2425	2300	48–φ70
2200	2220				2490	2240	50–φ72	2650	3520	50–φ72
2400	2420				2710	2640	50–φ72	2850	2750	50–φ72
2600	2620	600	240	150	2920	2860	52–φ74	3100	2900	52–φ74
2800	2820				3100	3060	52–φ74	3320	3100	52–φ74
3000	3020				3300	3290	54–φ76	3550	3300	54–φ76
3200	3220				3625	3500	54–φ76	3750	3550	54–φ76
3400	3420				3850	3710	60–φ80	3975	3760	60–φ80
3600	3620				4075	3920	60–φ80	4200	3970	60–φ80

Brief Installation Instructions
1. The B2F type (VSSJA-2) double-flange limit expansion joint is suitable for applications where both ends are equipped with valves or flanged connections.
2. All products are fully assembled and tested before leaving the factory. Simply connect both sides of the product to the valve or flange, evenly tighten the nuts adjacent to the gland cover in a diagonal pattern, then adjust the limit nuts as needed.
3. During the pressure test, the pipelines on both sides of the product should be securely fixed to prevent the product from being subjected to excessive axial forces that could damage the piping system.

	Name	Quantity	Material
1	Body	1	Carbon steel (Q235A) or ductile iron (QT400–15)
2	Sealing rubber Sealingmg	1	Natural Rubber (NR) Nitrile rubber (NBR) or chloroprene rubber (CR)
3	Pressing Cap Follower	1	Carbon steel (Q235A) or ductile iron (QT400–15)
4	Limited Short Pipe	1	Carbon steel (Q235A)
5	Nut	4n	Carbon steel (Q235A galvanized)
6	Long stud	n	Carbon steel (Q235A galvanized)
7	Bolt	n	Carbon steel (Q235A galvanized)