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National standard cast steel swing check valve

The swing check valve, also known as a one-way valve or a check valve, is used to prevent the backflow of the medium in the pipeline. The valve that opens or closes by itself by the flow and force of the medium to prevent the backflow of the medium is cal

Product Parameter

use

The swing check valve is suitable for various pipelines with nominal pressure PN1.0MPa~42.0MPa, Class150-2500; nominal diameter DN15~1200mm, NPS1/2~48; working temperature -196~540℃. Medium backflow. By choosing different materials (WCB, CF8(M), CF3(M), 1Gr5Mo, 15CrMo1V, it can be applied to various media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea. Mainly used for Petroleum, chemical, pharmaceutical, fertilizer, electricity and other pipelines.

structure

The swing check valve adopts a built-in rocker arm swing structure. All the opening and closing parts of the valve are installed inside the valve body and do not penetrate the valve body. Except for the sealing gasket and sealing ring used in the middle flange, the overall There is no leakage point, eliminating the possibility of valve leakage. The connection between the rocker arm and the disc of the swing check valve adopts a spherical connection structure, so that the disc has a certain degree of freedom in the range of 360 degrees, and has appropriate micro-position compensation.

It is suitable for clean medium, not suitable for medium containing solid particles and high viscosity.

Structure length: GB12221

Connection flange: JB/T79-1994

Test and inspection: JB/T9092-1999

Product pressure parameters：

Seal test

test pressure	Nominal pressure (MPa)
test pressure	1.6	2.5	4.0	6.4	10.0
Shell test	2.4	3.8	6.0	9.6	15.0
1.8	2.8	4.4	7.1	11.0
Body material	WCB(C)	CF8(P)	CF 8M (R)	WC6	WC9
Operating temperature	≤ 425	≤ 100	≤ 100	≤ 550	≤ 550
Applicable media	Water, steam, oil	Nitric acid	Acetic acid	Steam	Steam

Main external dimensions and connection dimensions:

National standard (GB) PN1.6MPa
DN	L	D	D1	D2	b	Z-фd
15	130	95	65	45	14	4-ф14
20	150	105	75	55	14	4-ф14
25	160	115	85	65	14	4-ф14
32	180	135	100	78	16	4-ф18
40	200	145	110	85	16	4-ф18
50	230	160	125	100	16	4-ф18
65	290	180	145	120	18	4-ф18
80	310	195	160	135	20	8-ф18
100	350	215	180	155	20	8-ф18
125	400	245	210	185	22	8-ф18
150	480	280	240	210	24	8-ф23
200	550	335	295	265	26	12-ф23
250	650	405	355	320	30	12-ф25
300	750	460	410	375	30	12-ф25
350	850	520	470	435	34	16-ф25
400	950	580	525	485	36	16-ф30
National standard (GB) PN2.5MPa
DN	L	D	D1	D2	b	Z-фd
15	130	95	65	45	16	4-ф14
20	150	105	75	55	16	4-ф14
25	160	115	85	65	16	4-ф14
32	180	135	100	78	16	4-ф18
40	200	145	110	88	18	4-ф18
50	230	160	125	100	20	4-ф18
65	290	180	145	120	22	4-ф18
80	310	195	160	135	22	8-ф18
100	350	230	190	160	24	8-ф23
125	400	270	220	188	28	8-ф25
150	480	300	250	218	30	8-ф25
200	550	360	310	278	34	12-ф25
250	730	425	370	332	36	12-ф30
300	850	485	430	390	40	16-ф30
350	850	550	490	448	44	16-ф30
400	950	610	550	505	48	16-ф34
450	1050	660	600	555	50	20-ф34
500	1150	730	660	610	52	20-ф41
National standard (GB) PN4.0MPa
DN	L	D	D1	D2	b	Z-фd
15	130	95	65	45	16	4-ф14
20	150	105	75	55	16	4-ф14
25	160	115	85	65	16	4-ф14
32	180	135	100	78	16	4-ф18
40	200	145	110	88	18	4-ф18
50	230	160	125	100	20	4-ф18
65	290	180	145	120	22	4-ф18
80	310	195	160	135	22	8-ф18
100	350	230	190	160	24	8-ф23
125	400	275	220	188	28	8-ф25
150	480	300	250	218	30	8-ф25
200	550	375	320	282	38	12-ф30