National Standard Check Valve

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National Standard Check Valve

Material: Stainless Steel, Carbon steel

Size Range: DN25-DN400

Connection Options: Flange

Working Pressure: 1.6 ~ 25MPa

Working Temperature:-29°C to 550°C

Sealing Options: Carbon steel surfacing iron-based alloys

Manufacturing Method: Carbon steel

Applicable Medium:Oil, Gas, Water

Manufacturing Standard:ANSI, ASME

Product Overview

The National Standard Check Valve is a robust, one-way flow control valve that prevents backflow in piping systems. Designed according to national standards, this valve is essential for protecting equipment and ensuring unidirectional flow in various industrial applications. It operates automatically, using the fluid pressure to open or close the valve, thus eliminating the need for manual control.

Product Features

Reliable Backflow Prevention: Ensures unidirectional flow to protect pumps, compressors, and other sensitive equipment.

Automatic Operation: Opens and closes based on fluid pressure, eliminating manual intervention.

Durable Construction: Built from high-quality materials for long-lasting performance, even under demanding conditions.

Multiple Connection Options: Available with various connection types to suit different piping systems.

Temperature and Pressure Resilience: Designed to withstand a broad range of pressures and temperatures, making it suitable for versatile applications.

Compliant with National Standards: Adheres to national standards for consistency, safety, and quality in industrial environments.

Specification Parameters

model		H44H-16C~250	H44W-16P~250
Work pressure（MPa）		1.6~25
proper temperature（℃）		≤425	≤550
Suitable media		Water, steam, oil	Weak corrosive medium
material	Body, bonnet, disc	Carbon steel	Chrome nickel-titanium stainless steel
	Sealing surface	Carbon steel surfacing iron-based alloys	Body sealed

The main shape and connection dimensions

Nominal diameterDN	The main dimensions and connection dimensions
Nominal diameterDN	L	D	D1	D2	b	Z-d	H
H44H-16C H44W-16C H44W-16P H44W-16R H44W-16I
25	160	115	85	65	16	4-14	100
32	180	135	100	78	16	4-18	105
40	200	145	100	85	16	4-18	115
50	230	160	125	100	16	4-18	135
65	290	180	145	120	18	4-18	142
80	310	195	160	135	20	8-18	165
100	350	215	180	155	20	8-18	180
125	400	245	210	185	22	8-18	210
150	480	280	240	210	24	8-23	233
200	500	335	295	265	26	12-23	304
250	550	405	355	320	30	12-25	348
300	650	460	410	375	30	12-25	390
350	750	520	470	435	34	16-25	430
400	850	580	525	485	36	16-30	468
H44H-25 H44W-25 H44W-25P H44W-25R H44W-25I
25	160	115	85	65	16	4-14	100
32	180	135	100	78	16	4-18	105
40	200	145	110	85	16	4-18	115
50	230	160	125	100	20	4-18	160
65	290	180	145	120	22	8-18	175
80	310	195	160	135	22	8-18	185
100	350	230	190	160	24	8-23	220
125	400	270	220	188	28	8-25	248
150	480	300	250	218	30	8-25	276
200	550	360	310	278	34	12-25	350
250	650	425	370	332	36	12-30	410
300	750	485	430	390	40	16-30	430
350	850	550	490	448	44	16-34	518
400	950	610	550	505	48	16-34	560

Specification Applications

Water Treatment: Used to maintain proper flow direction and prevent contamination in water distribution systems.

Petrochemical Industry: Prevents backflow in pipelines carrying oil, gas, and other hydrocarbons.

Power Generation: Ensures safe and unidirectional flow in high-pressure steam and cooling systems.

Industrial Manufacturing: Protects equipment in fluid transfer and process systems.

HVAC Systems: Prevents backflow in heating, ventilation, and air conditioning systems.

Valve Actuation

Process Optimization

Precision Engineering

Pipeline Solutions

Industrial Valves

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