C2F Double-Flange Force-Transmission Joint

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Pipe Expansion Joints

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Technical Specifications for C2F Type (VSSJAF) Double-Flange Force-Transmission Coupling

Product Introduction

The C2F type (VSSJAF) double-flange force-transmitting coupling is primarily used to connect equipment such as pumps, valves, and flanges within piping systems. The pipeline equipment is securely joined to the coupling via fully threaded bolts, which are tightened with nuts to form a unified assembly. A certain amount of displacement allowance is provided; during installation, the distance can be adjusted according to on-site dimensions. In service, the coupling forms a rigid connection with the pipeline, effectively transmitting axial thrust throughout the entire pipeline, thereby providing a degree of protection for equipment like pumps and valves. Additionally, the coupling offers sufficient expansion and contraction capacity to facilitate adjustment and maintenance of the piping system. It is mainly applied in pressurized pump rooms, valve pits, and similar locations.

Users can select from a range of products—including single-flange force‑transmitting joints, double-flange force‑transmitting joints, and detachable double-flange force‑transmitting joints—based on their actual operational needs.

Suitable for connecting pipelines conveying water, oil, gas, slurries, and particulate media, this product complies with the technical requirements specified in GB/T 12465-2017.

Structure and Material

Note: For VSSJAF double-flange force‑transmitting 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 C2F Type (VSSJAF) Double-Flange Force‑Transmitting Coupling (PN 0.6, 1.0 MPa)

Nominal Diameter Nominal Dia.DN	Pipe outer diameter Pipe O.D. Dw	External dimensions Overall Dimension		Flange Connection Dimensions Flange Connection Dimension
		L	△L	0.6MPa				1.0MPa
		L	△L	D	D1	n-Th.	b	D	D1	n-Th.	b
65	76	200	40	160	130	4-M12	16	185	145	4-M16	20
80	89			190	150	4-M16	18	200	160	8-M16	22
100	114			210	170	4-M16	18	220	180		24
125	140			240	200	8-M16	20	250	210		26
150	168			265	225		20	285	240	8-M20	26
200	219			320	280		22	340	285	8-M20	28
250	273			375	335	12-M16	24	395	350	12-M20	28
300	325	220	50	440	395	12-M20	23	445	400	12-M20	28
350	377			490	445	12-M20	25	505	460	16-M20	30
400	426			540	495	16-M20	28	565	515	16-M24	32
450	480			595	550	16-M20	28	615	565	20-M24	32
500	530			645	600	20-M20	30	670	620	20-M24	34
600	630	240		755	705	20-M24	30	780	725	20-M27	36
700	720	240		860	810	24-M24	32	895	840	24-M27	40
800	820	350	60	975	920	24-M27	34	1015	950	24-M30	44
900	920			1075	1020	24-M27	36	1115	1050	28-M30	46
1000	1020			1175	1120	28-M27	36	1230	1160	28-M30	50
1200	1220	370		1405	1340	32-M30	40	1455	1380	32-M36	56
1400	1420	370		1630	1560	36-M33	44	1675	1590	36-M39	62
1600	1620	380		1830	1760	40-M33	48	1915	1820	40-M45	68
1800	1820	380		2045	1970	44-M36	50	2115	2020	44-M45	70
2000	2020	400		2265	2180	48-M39	54	2325	2230	48-M45	74
2200	2220			2475	2390	52-M39	60	2550	2440	52-M52	80
2400	2420			2685	2600	56-M39	62	2760	2650	56-M52	82
2600	2620	450	80	2905	2810	60-M45	64	2960	2850	60-M52	88
2800	2820			3115	3020	64-M45	68	3180	3070	64-M52	94
3000	3020			3315	3220	68-M45	70	3405	3290	68-M56	100
3200	3220			3525	3430	72-M45	76	3635	3510	72-M56	106

Technical Parameters of C2F Type (VSSJAF) Double-Flange Force-Transmission Coupling (PN 1.6, 2.5 MPa)

Nominal Diameter Nominal Dia.DN	Pipe outer diameter Pipe O.D. Dw	External dimensions Overall Dimension		Flange connection dimensions Flange Connection Dimension
		L	△L	1.6MPa				2.5MPa
		L	△L	D	D1	n-Th.	b	D	D1	n-Th.	b
65	76	330	40	76	145	4-M16	20	185	145	8-M16	22
80	89			89	160	8-M16	20	200	160	8-M16	24
100	114			114	180	8-M16	22	235	190	8-M20	24
125	140			140	210	8-M16	22	270	220	8-M24	26
150	168	340		168	240	8-M20	24	300	250	8-M24	28
200	219			219	295	12-M20	24	360	310	12-M26	30
250	273			273	355	12-M24	26	425	370	12-M27	32
300	325	370	50	325	410	12-M24	28	485	430	16-M27	34
350	377	370		377	470	16-M24	30	550	490	16-M30	38
400	426	380		426	525	16-M27	32	610	550	16-M30	40
450	480			480	585	20-M27	36	660	600	20-M30	46
500	530			530	650	20-M30	38	730	660	20-M36	48
600	630	420		630	770	20-M33	40	840	770	20-M36	50
700	720	420		720	840	24-M33	40	955	875	24-M42	50
800	820	560	60	820	950	24-M36	42	1070	990	24-M42	54
900	920			920	1050	28-M36	44	1180	1090	28-M48	58
1000	1020			1020	1170	28-M39	46	1305	1210	28-M52	62
1200	1220	600		1220	1390	32-M45	52	1524	1420	32-M52	70
1400	1420	630		1420	1590	36-M45	58	1750	1640	36-M56	76
1600	1620	670		1620	1820	40-M52	64	1975	1860	40-M56	84
1800	1820	690		1820	2020	44-M52	68	2195	2070	44-M64	90
2000	2020	690		2020	2230	48-M56	70	2425	2300	48-M64	96
2200	2220	730		2220	2240	50-M56	80	2650	3520	50-M68	100
2400	2420	730		2420	2640	52-M56	82	2850	2750	50-M68	110
2600	2620	820	80	2620	2860	52-M60	82	3100	2900	52-M70	120
2800	2820	820		2820	3060	54-M60	84	3320	3100	52-M70	120
3000	3020	840		3020	3290	58-M62	86	3550	3300	54-M72	135
3200	3220	840		3220	3500	58-M62	90	3750	3550	54-M72	135

	Name	Quantity	Material
1	Body	1	Carbon steel (Q235A) or ductile iron (QT400-15)
2	Sealing rubber Seamingng	1	Natural Rubber (NR) Nitrile rubber (NBR) or chloroprene rubber (CR)
3	Press Cover Follower	1	Carbon steel (Q235A) or ductile iron (QT400-15)
4	Short flange pipe Short Pipe Flange	1	Carbon steel (Q235A)
5	Bolt	n	Carbon steel (Q235A galvanized)
6	Nut	5n	Carbon steel (Q235A galvanized)