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Check Valve Installation method

Check Valve Installation method

1. Swing Check Valve: the disc shape of the swing check valve rotates around the axis of the seat channel. Because the channel inside the valve is streamlined, the flow resistance is smaller than that of the lift check valve. It is suitable for large-diameter occasions with low flow rate and variable flow, but it is not suitable for pulsating flow, and its sealing performance is inferior to that of the lift check valve. Swing check valve is divided into three types: single valve type, double valve type and half valve type. These three types are mainly divided according to the valve diameter, in order to prevent the hydraulic impact from weakening when the medium stops flowing or reverses.

2. Lift check valve: the check valve whose valve disc slides along the vertical center line of the valve body. The lift check valve can only be installed on the horizontal pipeline. On the high-pressure small-diameter check valve, the disc can be a ball. The body shape of the lift check valve is the same as that of the stop valve, so its fluid resistance coefficient is larger. Its structure is similar to the stop valve, and the valve body and disc are the same as the stop valve. The upper part of the valve disc and the lower part of the valve cover are provided with guide sleeve. The guide sleeve of the valve disc can rise and fall freely in the guide sleeve of the valve cup. When the medium flows downstream, the valve disc will open by the medium thrust. When the medium stops flowing, the valve disc will fall on the valve seat by itself to prevent the medium from flowing backward. The direction of medium inlet and outlet channel of straight through lift check valve is perpendicular to the direction of valve seat channel; the direction of medium inlet and outlet channel of vertical lift check valve is the same as that of valve seat channel, and its flow resistance is smaller than that of straight through check valve.

3. Disc check valve: a check valve in which the disc rotates around the pin in the seat. The disc check valve has a simple structure, which can only be installed on the horizontal pipeline with poor sealing performance.

4. Pipeline check valve: valve whose disc slides along the center line of the valve body. Pipeline check valve is a new kind of valve. It has small volume, light weight and good processing technology. It is one of the development directions of check valve. But the fluid resistance coefficient is slightly larger than that of swing check valve.

5. Compression check valve: this kind of valve is used as boiler feed water and steam cut-off valve, it has the comprehensive function of lift check valve and stop valve or angle valve.

In addition, there are some check valves that are not suitable for pump outlet installation, such as bottom valve, spring type, Y type, etc.

matters needing attention

1. Don't let the check valve bear the weight in the pipeline system. The large check valve should be supported independently so that it is not affected by the pressure generated by the pipeline system.

2. During installation, pay attention to the direction of medium flow should be consistent with the direction of arrow marked on the valve body.

3. Lift type vertical disc check valve shall be installed on vertical pipeline.

4. Lift type horizontal disc check valve shall be installed on horizontal pipeline.

Ningbo RMI Plastic Co.,Ltd
Business Type:Manufacturer
Product Range:Valves , Pipe Fittings , Pipe Fittings
Products/Service:PVC PP PVDF Diaphragm Valve , PP PVC Butterfly Valve , Plastic Valve , PVC Pipe Fitting , PVC check valve , PVC Ball Valve
Company Address:No.731 Mingzhou Road,Xinqi Street,Beilun Dist, Ningbo, Zhejiang, China

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