National Standard Lift-Type Check Valve

The oxygen specific shut-off valve is made of high-quality silicon brass or stainless steel casting, which has the advantages of high mechanical strength, wear resistance, and good safety. Used on oxygen pipelines, it has effective explosion-proof and flame-retardant properties, eliminating unsafe factors on oxygen pipelines.

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Check Valve Series

Keyword： National Standard Lift-Type Check Valve

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Check valve

Check valves in pipelines should not bear any weight—large check valves must be supported independently to ensure they remain unaffected by pressure generated within the piping system. During installation, make sure the flow direction of the medium aligns with the arrow indicated on the valve body. These valves are suitable for a wide range of media, including water, steam, oils, nitric acid, acetic acid, oxidizing agents, urea, and more.

Precautions for Installing Check Valves

1. Do not allow the check valve to bear any weight within the pipeline; large-sized check valves should be supported independently to ensure they are unaffected by pressure generated by the piping system.

2. When installing, ensure the direction of media flow matches the arrow indicated on the valve body.

3. The lift-type vertical check valve should be installed on a vertical pipe.

4. The lift-type check valve should be installed on a horizontal pipeline.

Check Valve Performance Parameters

Nominal pressure or pressure class: PN 1.0–16.0 MPa, ANSI CLASS 150–900, JIS 10–20K

Nominal diameter or bore: DN15–900, NPS 1/4–36

Connection methods: flange, butt weld, thread, socket weld, and more

Applicable temperature: -196°C to 540°C

Valve body materials: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti.

Model	Nominal pressure PN (MPa)	Test pressure PS (MPa)		Operating temperature (°C)	Work stress PN (MPa)	Applicable Medium
		Housing	Sealing
H41W-16P	1.6	2.4	1.76	≤100	1.6	Nitrate compounds
H41W-16R						Acetic acid derivatives
H41W-16A				≤150		Nitrate compounds
H41W-25P	2.5	3.8	2.8	≤100	2.5	Acetic acid derivatives
H41W-25R						Nitrate compounds
H41W-25A				≤150		Acetic acid derivatives
H41W-40P	4.0	6.0	4.0	≤100	4.0	Nitrate compounds
H41W-40R						Acetic acid derivatives

Main external and connection dimensions of check valves

Model	Nominal Diameter DN (mm)	Dimensions (mm)
Model	Nominal Diameter DN (mm)	L	D	D	D	Z-φd	b	H
H41W-16P(R) H44W-16P(R)	15	130	95	65	45	4-φ14	14	77
	20	150	105	75	55	4-φ14	14	77
	25	160	115	85	65	4-φ14	16	80
	32	180	135	100	78	4-φ18	16	85
	40	200	145	110	85	4-φ18	16	95
	50	230	160	125	100	4-φ18	16	105
	65	290	180	145	120	4-φ18	18	120
	80	310	195	160	135	8-φ18	20	130
	100	350	215	180	155	8-φ18	20	140
	125	400	245	210	185	8-φ18	22	155
	150	480	280	240	210	8-φ23	24	180
	200	600	335	295	265	12-φ23	26	215
H41W-25P(R) H44W-25P	15	130	95	65	45	4-φ14	16	77
	20	150	105	75	55	4-φ14	16	77
	25	160	115	85	65	4-φ14	16	80
	32	180	135	100	78	4-φ18	18	85
	40	200	145	110	85	4-φ18	18	95
	50	230	160	125	100	4-φ18	20	105
	65	290	180	145	120	8-φ18	22	120
	80	310	195	160	135	8-φ18	22	130
	100	350	230	190	160	8-φ23	24	140
	125	400	270	220	188	8-φ25	28	155
	150	480	300	250	218	8-φ25	30	180
	200	600	360	310	278	12-φ30	34	215