What is Axial Flow Check Valve ?
The flow medium of the axial check valve flows along the axis and the flow channel is highly symmetrical along the axis. It is mainly composed of a single structure of valve body, valve sleeve, valve disc, valve stem, valve seat, bushing, spring and other fasteners and seals. Structurally, like the lift check valve, the valve core moves along the axis of the valve body to realize the opening and closing action of the valve. However, the streamlined design of the inner cavity of the valve body and the guide cover makes the fluid present a laminar flow state on the flow surface, avoiding the occurrence of turbulence.
Advantages of axial flow check valve
- 01Compared with swing check valves and double-disc check valves, axial check valves have shorter strokes, especially for large-diameter valves, which can achieve rapid closing.
- 02The short stroke of the axial check valve ensures the rapid dynamic response of the valve disc and minimizes the reverse flow rate through the valve, thereby preventing the danger of water hammer.
- 03Protect rotating equipment from damage caused by fluid backflow. It can completely prevent damage to upstream equipment caused by backflow of the medium.
- 04There is a reset spring on the valve core of the axial check valve. The valve core and the guide cover are located in the middle of the valve body, and the flow resistance is larger.
- 05Small mechanical vibration and low noise. The axial check valve can achieve true non-impact, so the mechanical vibration is small and the corresponding noise is also low.
- 06The axial check valve closes faster, the spool is spring-loaded, and the spool can be closed when the inlet medium pressure is lower than the spring thrust, and the switching noise is small.
Design Standard
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| The characteristics of axial flow check valve |
The inlet medium pressure pushes the valve disc to open, and the surface of the valve disc on the inlet side is arc-shaped. After opening, it is combined with the guide cover to form a spindle, which reduces the flow resistance. The inner cavity of the valve body is a Venturi structure with a guide cover inside. The entire flow surface is streamlined, the flow channel has a smooth transition to reduce vortex, and effectively reduce flow resistance. Axial flow check valves can use metal hard seals and cladding hard alloys, or soft and hard composite seal structures, which make the sealing surface more durable and extend the service life. The valve disc of the axial flow check valve has a small mass, which reduces the friction on the guide surface and the valve disc can quickly return to the seat. The small mass and low inertia valve disc contacts the valve seat surface after a short stroke and with a very small impact force, which can avoid damage to the valve seat sealing surface and prevent valve seat leakage. |
| Technical Parameters | |
| Size | DN15-DN1500, 1/2''-60'' |
| Pressure | PN10-PN420, Class150-Class2500 |
| Temperature | -200°C to 650°C |
| Connection Type | Flange, Thread, Wafer, Welded |
| Operation Mode | Manual, Pneumatic, Electric, Hydraulic, Gear operation |
| Materials | ||
| Valve Body | Forged | A105, LF2, F5, F9, F11, F22, F304, F316, F347, F904, F51, F53, F310, N08020, Inconel625, etc |
| Cast | WCB, LCB, C5, C12, WC6, WC9, CF8, CF8M, CF8C, 4A, 5A, CN7M, C95800, CW6MC, etc | |
| Valve Stem | F6a, 17-4PH, XM-19, F304, F316, F347, F904, F51, F53, F310, Monel400, Monel500, N08020, Inconel625, Incoloy825, etc | |
| Valve Disc | A105, LF2, F5, F9, F11, F22, F304, F316, F347, F904, F51, F53, F310, N08020, Inconel625, F6a, 17-4PH, XM-19, F304, F316, F347, F904, F51, F53, F310, Monel400, Monel500，Incoloy825，WCB, LCB, C5, C12, WC6, WC9, CF8, CF8M, CF8C, 4A, 5A, CN7M, C95800, CW6MC, etc | |
| Seat Sealing | SS, BR, CU, AS, CS, AL, PTFE, NBR, FKM, AI203, etc | |
| Design Standards | |
| Valve Body | API 6D, API 608, ASME B16.34, DIN 3357, BS 5351, GOST 9833, JIS B2071, GB/T 12237, etc |
| Flange | ANSI B16.5, EN 1092-1, JIS B2220, GB/T 9113, ASME B16.47, GOST 12821, DIN 2543-2545, etc |
| Connection | ANSI B16.10, ASME B16.25, JIS B2212, GOST 33259, DIN 3202, etc |
| Test Standards | API 598, ISO 5208, BS EN 12266, ASME B16.104, GOST 9544-2015, JIS B2003, DIN 3230, etc. |
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