Swing Check Valve

Material:Stainless Steel (SS304, SS316)

Size Range:DN50-DN400

Connection Options:Female Thread

Working Pressure:1.6MPa-25Mpa

Working Temperature:-29°C to 425°C

Sealing Options:PTFE, VITON, PEEK, Graphite

Manufacturing Method:Forging

Applicable Medium:Oil, Gas, Water

Manufacturing Standard:ANSI, ASME, GB, JIS, DIN, customize as per customers’ drawing

Product Overview

The swing check valve is a one-way valve that allows fluid to flow in one direction and automatically closes to prevent backflow. It features a hinged disc that swings open with forward flow and shuts when flow reverses, protecting equipment from pressure surges and damage. Commonly used in water, steam, oil, and gas pipelines, it is suitable for horizontal and vertical installations and available in various materials for different pressures and media.

Product Features

Structural Advantages and Features

The product is designed and manufactured in accordance with national standard GB 12236, with reasonable structure, reliable sealing, and excellent performance.
Valve disc and seat are made from iron alloy or stellite (cobalt-based hard alloy) via surfacing welding. These materials offer excellent wear resistance, high temperature resistance, corrosion resistance, anti-abrasion properties, and long service life.
Flange connections and sealing surfaces can be selected based on various piping standards and engineering project requirements to meet user-specific needs.
A full range of body materials and gaskets are available to suit different working pressures, temperatures, and fluid media.
The disc swings open and closes outside the flow path to minimize impact from closing and reduce water hammer.
The hinge pin is integrally connected with the valve flap; the built-in structure prevents external leakage and ensures greater reliability.

Standards and Norms

Category	Standard
Design and Manufacture	GB 12236
Structure Length	GB 12221
Pressure – Temperature Rating	GB 12224
Connection Flange	JB/T 74-94, GB 9113, HG 20592–20635
Test and Inspection	JB/T 9092–1999, GB 13927

Specification Parameters

Performance Parameters

No.	Project Name	PN16	PN25	PN40	PN64	PN100	PN160
1	Nominal Pressure PN (MPa)	1.6	2.5	4.0	6.4	10	16
2	Shell Test Pressure (MPa)	2.4	3.75	6.0	9.6	16	24
3	High-Pressure Sealing Test (MPa)	1.76	2.75	4.4	7.04	11	17.6
4	Maximum Working Pressure (MPa)	≤1.6	≤2.5	≤4.0	≤6.4	≤10	≤16

Main Components Material

Part Name	Material (PN16)	Material (PN25)	Material (PN40–160)
Body	WCB	15CrMo	20CrMoV
Valve Cover	WCB	15CrMo	20CrMoV
Disc	A105	15CrMo	20CrMoV
Sealing Face	20Cr13	STL	STL
Shaft Pin	20Cr13	35CrMoV	35CrMoV
Gasket	304 + Flexible graphite	304 + Flexible graphite	304 + Flexible graphite
Bolt	35CrMoA	35CrMoA	35CrMoA
Nut	30CrMo	30CrMo	30CrMo
Applicable Temperature	-29°C to 425°C	-29°C to 540°C	-29°C to 560°C
Suitable Medium	Water, steam, oil, etc.	Water, steam, oil, etc.	Water, steam, oil, etc.

Main External and Connection Dimensions

PN (MPa)	DN (mm)	L (mm)	D (mm)	D1 (mm)	D2 (mm)	b–f (mm)	Z–φd (mm)	D6 (mm)	H (mm)	Weight (kg)
1.6	50	230	160	125	100	16–2	4–φ18	/	160	22
	65	290	180	145	120	18–3	4–φ18	/	177	26
	80	310	195	160	135	20–3	8–φ18	/	187	33
	100	350	215	180	155	20–3	8–φ18	/	202	39
	125	400	245	210	185	22–3	8–φ18	/	227	57
	150	480	280	240	210	24–3	8–φ23	/	263	80
	200	550	335	295	265	26–3	12–φ23	/	293	95
	250	650	405	355	320	30–3	12–φ25	/	330	175
	300	750	460	410	375	30–4	12–φ25	/	382	260
	350	850	520	470	435	34–4	16–φ25	/	430	360
	400	950	580	525	485	36–4	16–φ30	/	480	496
	500	1150	705	650	608	44–4	20–φ34	/	560	588
2.5	50	230	160	125	100	20–3	4–φ18	/	177	22
	65	290	180	145	120	22–3	8–φ18	/	192	30
	80	310	195	160	135	22–3	8–φ18	/	192	35
	100	350	230	190	160	24–3	8–φ23	/	217	52
	125	400	245	220	188	28–3	8–φ25	/	250	73
	150	480	300	250	218	30–3	8–φ30	/	270	103
	200	550	360	310	276	34–3	12–φ25	/	350	135
	250	650	425	370	332	36–3	12–φ30	/	410	196
	300	750	485	430	390	40–4	16–φ30	/	430	285
	350	850	555	490	448	44–4	16–φ34	/	450	388
	400	950	620	550	505	48–4	16–φ34	/	560	496
	500	1150	730	660	610	52–4	20–φ41	/	618	641

PN (MPa)	DN (mm)	L	D	D1	D2	D6	b–f	F2	Z–φd	H	Weight (kg)
4.0	50	230	160	125	105	88	20–3	4.5	4–φ18	177	22
	65	290	180	145	130	110	22–3	4.5	4–φ18	192	30
	80	310	195	160	140	121	22–3	4.5	8–φ18	192	34
	100	350	230	190	168	150	24–3	4.5	8–φ23	217	52
	125	400	270	220	202	176	28–3	4.5	8–φ25	259	73
	150	480	300	250	240	204	30–3	4.5	8–φ25	270	103
	200	550	375	320	300	260	38–3	4.5	12–φ30	340	212
	250	650	445	385	352	313	42–3	4.5	12–φ34	401	297
	300	750	510	450	412	364	46–4	4.5	16–φ34	423	362
	350	850	570	510	475	422	52–4	5	16–φ34	460	450
	400	950	655	585	525	474	58–4	5	16–φ41	490	585
	500	1150	755	670	612	576	62–4	5	20–φ48	618	641
PN (MPa)	DN (mm)	L	D	D1	D2	D6	b–f	F2	Z–φd	H	Weight (kg)
6.4	50	300	175	135	105	88	26–3	4	4–φ23	192	30
	65	340	200	160	130	110	28–3	4	8–φ23	207	41
	80	380	210	170	140	121	30–3	4.5	8–φ23	207	48
	100	430	250	200	168	150	32–3	4.5	8–φ25	235	72
	125	500	295	240	202	176	36–3	4.5	8–φ30	265	105
	150	580	340	280	240	204	38–3	4.5	8–φ34	297	155
	200	650	405	345	300	260	44–3	4.5	12–φ34	357	217
	250	775	470	400	352	313	48–3	4.5	12–φ41	405	341
	300	900	530	460	412	364	54–4	4.5	16–φ41	465	472
	350	1025	595	525	475	422	60–4	5	16–φ41	514	627
	400	1150	675	585	535	474	65–4	5	16–φ48	568	882
PN (MPa)	DN (mm)	L	D	D1	D2	D6	b–f	F2	Z–φd	H	Weight (kg)
10.0	50	300	195	145	112	88	28–3	4	4–φ25	192	41
	65	340	220	170	138	110	32–3	4	8–φ25	207	48
	80	380	230	180	148	121	34–3	4.5	8–φ30	235	72
	100	430	265	210	172	150	38–3	4.5	8–φ30	265	108
	125	500	315	250	210	175	42–3	4.5	8–φ34	310	130
	150	580	350	290	250	204	46–3	4.5	12–φ34	360	217
	200	650	450	360	312	260	54–3	4.5	12–φ41	420	341
	250	775	500	430	382	313	60–3	4.5	12–φ41	480	472
	300	900	585	500	442	364	70–4	5	16–φ48	520	620
	350	1025	665	560	498	422	76–4	5	16–φ54	584	830
	400	1150	715	620	558	474	80–4	5	16–φ54	625	1060
PN (MPa)	DN (mm)	L	D	D1	D2	D6	b–f	F2	Z–φd	H	Weight (kg)
16.0	50	300	215	165	132	88	36–3	4	4–φ28	251	49
	65	340	245	190	152	110	44–3	4	8–φ30	282	58
	80	380	290	225	168	121	46–3	4.5	8–φ30	324	110
	100	430	305	240	200	150	48–3	4.5	8–φ34	356	162
	125	500	355	285	238	176	60–3	4.5	8–φ41	393	214
	150	580	390	318	270	204	66–3	4.5	12–φ41	430	267
	200	650	470	385	345	260	78–3	4.5	12–φ48	476	443
	250	800	580	485	425	313	88–3	4.5	12–φ54	514	610
	300	950	685	570	510	364	104–4	4.5	16–φ54	587	685
PN (MPa)	DN (mm)	L	D	D1	D2	D6	b–f	F2	Z–φd	H	Weight (kg)
25.0	50	368	210	160	128	70	40–3	5	8–φ25	310	63
	65	419	220	203	165	97	48–3	5	8–φ30	348	78
	80	470	290	230	190	116	54–3	5	8–φ34	385	140
	100	546	330	292	245	138	66–3	6	12–φ41	406	210
	125	673	385	318	270	170	76–3	6	12–φ41	534	280
	150	780	460	385	306	190	82–3	6	12–φ55	580	347
	200	832	535	440	380	245	92–3	6	12–φ51	318	575
	250	991	670	572	508	319	110–3	6	16–φ55	673	790

Specification Applications

Swing check valves are primarily used to prevent reverse flow in piping systems, ensuring that fluid moves in only one direction. These valves automatically open with forward flow and close under backflow pressure, protecting pumps, compressors, and other critical equipment from potential damage caused by reverse flow or water hammer.

They are widely applied across various industries, including:

Water and Wastewater Treatment: Prevents backflow in clean water and sewage systems.
Power Plants: Ensures unidirectional flow in condensate, feedwater, and steam lines.
Oil and Gas: Used in upstream, midstream, and downstream pipelines to protect process integrity.
Chemical and Petrochemical Plants: Provides corrosion-resistant solutions for handling aggressive fluids.
HVAC Systems: Maintains flow direction and pressure stability in heating and cooling circuits.
Fire Protection Systems: Installed in fire main loops to ensure proper directional flow and system reliability.

Due to their simple design and low pressure drop, swing check valves are ideal for horizontal installations and systems with infrequent flow reversals.

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