Common types and characteristics of check valves in daily life
Classification:
Release Time：2021-05-21
Swing check valve disc disc-shaped, rotating movement around the rotating shaft seat channel, the valve into a streamlined channel, the flow resistance is smaller than the lift check valve, suitable for low flow rate and flow changes are not often large diameter occasions, but should not be used for pulsating flow, its sealing performance is less than lift. Swing check valve is divided into single disc type, double disc type and most of the three types, these three forms are mainly divided according to the valve caliber, the purpose is to prevent the medium to stop flow or backflow, weaken the hydraulic impact.
1. swing check valve: swing check valve disc-shaped, rotating movement around the seat channel shaft, the valve channel into a streamlined flow, flow resistance than lift check valve, suitable for low flow rate and flow changes are not often large-diameter occasions, but should not be used for pulsating flow, the sealing performance is less than lift. Swing check valve is divided into single disc type, double disc type and most of the three types, these three forms are mainly divided according to the valve caliber, the purpose is to prevent the medium to stop flow or backflow, weaken the hydraulic impact.
2. lift check valve: valve along the valve body vertical center line sliding check valve, lift check valve can only be installed in the horizontal pipe, in the high pressure small diameter check valve disc can be used ball. The shape of the valve body of the lift check valve is the same as the cut-off valve (can be used with the cut-off valve), so its fluid resistance coefficient is large. The structure is similar to the cut-off valve, and the valve body and disc are the same as the cut-off valve. The upper part of the valve disc and the lower part of the valve cover are processed with a guide sleeve. The guide sleeve can be freely lifted and lowered in the guide sleeve. When the medium flows downstream, the valve disc is opened by the thrust of the medium. When the medium stops flowing, the valve disc is vertically lowered on the valve seat to prevent the medium from flowing back. Straight-through lift check valve medium inlet and outlet channel direction and seat channel direction perpendicular; vertical lift check valve, the medium inlet and outlet channel direction and seat channel direction is the same, the flow resistance is straight-through small.
3. butterfly check valve: check valve whose disc rotates around the pin in the seat. Disc check valve structure is simple, can only be installed in the horizontal pipe, poor sealing.
4. ducted check valve: Valve whose disc slides along the centerline of the valve body. Pipeline check valve is a new type of valve, its small size, light weight, good processing technology, is one of the development direction of the check valve. But the fluid resistance coefficient is slightly larger than the swing check valve.
5. compression check valve: this valve is used as boiler feed water and steam cut off valve, it has a lift check valve and cut-off valve or angle valve integrated function.
In addition, some do not apply to the pump outlet to install the check valve, such as the bottom valve, spring type, Y type, etc. On the line.
Previous Page
Related News
2026/02/28
Contact Information
+86 27-8970 8339
Address: No.5, Zhengjie, Shuangliu Street, Xinzhou District, Wuhan City, Hubei Province