Axial Flow Check valve

Axial Flow Check Valve When the pressure on the inlet side is lower than that on the outlet side, the disc automatically closes under the action of the media pressure difference and its own gravity to prevent backflow of the media.

Longz was established in 2003. Through years of hard work and development, it has grown into a comprehensive valve enterprise integrating research, design, manufacturing, sales, and services.

Axial Flow check valve Manufacturer in China

Every time a medium has to turn or squeeze past an obstruction inside your valve, you pay in pressure loss, noise and vibration. Our axial flow check valve gives the flow a single axially symmetric, streamlined passage between the inner and outer bodies. — no recirculation, no high-velocity jets, no shock loading on the internals. One-piece cast body: low pressure loss, high flow capacity per unit diameter, quiet and stable in service.

various types of Our Axial Flow check valve

rubber disc check valve

The rubber disc check valve is primarily composed of three main components: the valve body, the mesh cover, and the rubber. Among them, the rubber valve is constructed with a base made of steel plate, steel plate, and reinforced nylon fabric, and an outer layer covered in rubber. The mesh-covered switch can withstand up to hundreds of thousands of actuations.

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pair clamp check valve

The palr clamp check valve primarily consists of key components such as the body, disc, disc stem, and spring, and features a thin and lightweight design. Due to the shortened closing stroke of the valve plates and the effect of the spring, which accelerates the closing process, it can reduce water hammer and water hammer noise.

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energy saving silent check valve

The upper part of the disc and the lower part of the bonnet of the energy saving silent check valve are machined with guide sleeves. The disc guide tube can move freely up and down within the bonnet guide tube. When backflow occurs, the disc opens under the thrust of the fluid.

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Features of the valve core in an axial flow check valve.

If your line runs at low back pressure, you know the failure mode: a conventional swing check chatters and leaks. Here the spring In our axial flow check valve, the spring — not the flow reversal — closes the valve, so the disc seats early and evenly precisely where a conventional check valve loses its seal.FKM-encapsulated aluminium disc: no metal-to-metal knocking, no static spark at the seat.

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Your Trusted Axial Flow check valve Manufacturer in China

Longz possesses a comprehensive enterprise standard management system, employing world-class precision casting technology and modern electronic inspection systems. Longz applies advanced management concepts to the factory management model, utilizing the UKAS-ISO international quality assurance system and on-site 6S standards. Standardized management is perfectly integrated, with the entire process from material selection to finished product dispatch utilizing a self-developed advanced MES intelligent manufacturing management system. (LMES) manages product processes and quality traceability, achieving specialized, automated, standardized, and procedural organization of production.

Application Scenarios of Axial Flow Check Valve

Municipal Water Supply

With a spring-assisted floating disc, the valve closes smoothly as differential pressure drops — never slamming shut. Water hammer is suppressed at its source, reducing pipeline vibration, noise and joint fatigue while protecting downstream pumps, valves and piping.

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Gas

Between the inner and outer bodies lies an axially symmetric streamlined flow channel, where the medium does not circulate, generate localized high-speed flows, or experience jet impact—resulting in low operating noise, minimal vibration, and flow resistance close to that of a straight pipe segment of the same length.The valve body is cast as a whole, offering good rigidity and fewer external leakage points.

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Oil

The valve disc features an aluminum alloy skeleton, fully encased in FKM fluororubber soft sealing.The lightweight frame reduces the inertia of the valve disc—allowing it to open with minimal pressure difference and returning to its position quickly and smoothly once the pressure difference decreases.

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One-stop solution for Axial flow check valve

Longz has obtained the Class A qualification certification for special equipment manufacturing issued by the People’s Republic of China, as well as certification from the American Petroleum Institute (API). Certified as a qualified product by authoritative testing institutions both domestically and internationally, it holds over 50 patents and technological innovation patents.

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Dimension Specification Table for Axial Flow Check Valve

Size		D	L-BW	L-RF	L-RTJ	H

PN2.0MPa(Class150)
2	50	49	203	203	216	102
3	80	74	241	241	254	128
4	100	100	292	292	305	160
6	150	150	356	356	368	200
8	200	201	495	495	508	255
10	250	252	622	622	635	308
12	300	303	699	699	711	348
14	350	334	787	787	800	360
16	400	385	864	864	876	410
18	450	436	978	978	991	430
20	500	487	978	978	991	492
22	550	538	1067	1067	1080	505
24	600	589	1295	1295	1308	570
26	650	633	1295	1295	1308	618
28	700	684	1448	1448	1461	692
30	750	735	1524	1524	1357	800
32	800	779	1778	1778	1794	804
34	850	830	1930	1930	1946	817
36	900	874	1965	1965	1981	945
40	1000	976	2159	2159	2175	980
42	1050	1020	2261	2261	2277	1110
48	1200	1166	2566	2566	2582	1265
PN5.0MPa(Class300)
2	50	49	267	267	283	102
3	80	74	318	318	333	128
4	100	100	356	356	371	160
6	150	150	445	445	460	200
8	200	201	533	533	549	255
10	250	252	622	622	638	308
12	300	303	711	711	727	348
14	350	334	838	838	854	360
16	400	385	864	864	879	410
18	450	436	978	978	994	430
20	500	487	1016	1016	1035	492
22	550	538	1118	1118	1140	505
24	600	589	1346	1346	1368	570
26	650	633	1346	1346	1372	618
28	700	684	1499	1499	1524	692
30	750	735	1594	1594	1619	800
32	800	779	1778	1778	1794	804
34	850	830	1930	1930	1946	817
36	900	874	2083	2083	2099	945
40	1000	976	2286	2286	2302	980
42	1050	1020	2438	2438	2454	1110
48	1200	1166	2617	2617	2633	1265
PN6.3MPa(Class400)
2	50	49	292	292	295	102
3	80	74	356	356	359	128
4	100	100	432	432	435	160
6	150	150	559	559	562	200
8	200	201	660	660	664	255
10	250	252	787	787	791	308
12	300	303	838	838	841	348
14	350	334	889	889	892	360
16	400	385	991	991	994	410
18	450	436	1092	1092	1095	430
20	500	487	1194	1194	1200	492
22	550	538	1295	1295	1305	505
24	600	589	1397	1397	1407	570
26	650	633	1448	1448	1461	618
28	700	684	1600	1600	1613	692
30	750	735	1651	1651	1664	800
32	800	779	1778	1778	1794	804
34	850	830	1930	1930	1946	817
36	900	874	2083	2083	2099	945
40	1000	976	2286	2286	2302	980
42	1050	1020	2438	2438	2454	1110
48	1200	1166	2617	2617	2633	1265
PN10.0MPa(Class600)
2	50	49	292	292	295	102
3	80	74	356	356	359	128
4	100	100	406	406	410	160
6	150	150	495	495	498	200
8	200	201	597	597	600	255
10	250	252	673	673	676	308
12	300	303	762	762	765	348
14	350	334	889	889	892	360
16	400	385	902	902	905	410
18	450	436	1016	1016	1019	430
20	500	487	1054	1054	1060	492
22	550	538	1143	1143	1153	505
24	600	589	1397	1397	1407	570
26	650	633	1397	1397	1410	618
28	700	684	1600	1600	1613	692
30	750	735	1651	1651	1664

The axial flow check valve from Longz is of excellent quality, with solid craftsmanship and stable performance, effectively meeting practical usage requirements. It possesses excellent flow capacity, allowing media to pass smoothly with minimal resistance, thereby effectively ensuring the efficient operation of the pipeline system. It operates with very low noise and minimal vibration, maintaining a stable and quiet working state even during prolonged use.
Procurement Manager
American Gas Company
This axial flow check valve features excellent sealing performance, effectively preventing backflow and leakage of the medium, ensuring safe and stable operation of the piping system. Before placing the order, they specifically sent me videos of the casing test and sealing test, allowing me to visually understand that the product undergoes rigorous quality inspection before leaving the factory, with all performance indicators meeting our standards for this model. The requirements for the axial flow check valve have further strengthened our confidence
Engineer
Saudi company

What is the body material of your axial flow check valve?

The valve body materials of this axial flow check valve include WCB, LCB, A105, etc.

What is the applicable temperature range for your axial flow check valve?

The operating temperature range of this axial flow check valve is -46 to 350°C.

What are the design standards for your axial flow check valve?

The design standard for this axial flow check valve is based on API 6D and other relevant specifications.

Dxplaination of Axial Flow Check Valve

This type of axial flow check valve is designed for use in medium- and low-pressure gas pipelines and serves as a valve that automatically prevents the backflow of natural gas. The disc of an axial-flow check valve opens under the action of media pressure, allowing the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve disc automatically closes under the action of the media pressure difference and its own gravity to prevent backflow of the media. This type of axial flow check valve features a valve disc with an overall high-temperature vulcanized VITON fluororubber soft-seal structure. This design enhances sealing performance, eliminates the knocking sounds caused by unstable airflow-induced metal seal surfaces, prevents impact noises from unstable airflow, and removes the risk of static electricity generation. It avoids sparks from metal seal rotation friction, thereby preventing electrostatic discharge and spark risks. This extends the service life of the valve. VITON fluororubber soft-seal ensures that valves meet the “zero” leakage sealing requirement. Due to the adoption of rubber sealing principles, It is highly suitable for various gas media and can cause minor scratches on the valve seat without leading to internal leakage even when rust, impurities, or particles are present in the pipeline. The sealing life exceeds 30 years with no maintenance required. When the nominal pressure is PN40, the valve seat sealing surface material is nylon plastic.

When installing an axial flow check valve (whether in horizontal or vertical orientation), special attention must be paid to the direction of fluid flow. The normal flow direction of the medium should align with the arrow indication on the valve body; otherwise, it will block or obstruct the normal flow of the medium.