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What Are the Installation Methods and Precautions for Various Check Valves?

Generally speaking, do not let the check valve bear weight in the pipeline system. Large check valves should be supported independently to avoid the impact of pressure generated by the pipeline system. During installation, pay attention to the direction of fluid flow, which should be consistent with the direction indicated by the arrow on the valve body. Lift-type vertical disc check valves should be installed on vertical pipelines, while lift-type horizontal disc check valves should be installed on horizontal pipelines. Next, let's briefly introduce the installation methods of the check valve!


Pipeline check valve


A valve that slides along the centerline of the valve body. The pipeline check valve is a new type of valve, which is small in size, light in weight, and has good processing performance. It is one of the development directions of stainless steel check valves. However, the fluid resistance coefficient is slightly larger than that of the swing check valve.


Lift-type check valve


A check valve in which the valve disk slides along the vertical centerline of the valve body. The lift-type check valve can only be installed on horizontal pipelines. A spherical valve disk can be used on high-pressure small-diameter check valves. The shape of the lift-type check valve body is the same as that of the globe valve (can be used interchangeably with the globe valve), so its fluid resistance coefficient is larger. Its structure is similar to that of the globe valve, and the valve body and valve disk are the same as those of the globe valve. There are guide sleeves machined on the upper part of the valve disk and the lower part of the valve cover, and the guide sleeve of the valve disk can move freely. When the medium flows in the forward direction, the valve disk opens by the thrust of the medium, and when the medium stops flowing, the valve disk falls freely onto the valve seat, preventing backflow. The flow direction of the straight-through lift check valve is perpendicular to the channel direction of the valve seat; the flow direction of the vertical lift check valve is the same as the channel direction of the valve seat, and its flow resistance is smaller than that of the straight-through type.


Swing check valve


A check valve whose valve disk is disc-shaped and rotates around the axis of the valve seat channel. Because the inner channel of the valve forms a streamline shape, the flow resistance is smaller than that of the lift-type check valve. It is suitable for large-diameter occasions with low flow rate and little flow change, but it is not suitable for pulsating flow, and its sealing performance is inferior to that of the lift-type check valve. Swing check valves are divided into single-disc, double-disc, and multi-half types according to the valve diameter, aiming to prevent water hammer when the medium stops flowing or flows back.


Compression type check valve


This type of valve is used to cut off boiler feed water and steam. It has the combined functions of lift-type check valve, globe valve, and angle valve.


Disc check valve


A check valve in which the valve disk rotates around the pin shaft of the valve seat. The disc check valve has a simple structure and can only be installed on horizontal pipelines. Its sealing performance is poor.


The above is the relevant explanation of the installation methods and precautions for different types of check valves. In addition, there are some check valves that are not suitable for installation at the pump outlet, such as bottom valves, spring check valves, Y-type check valves, etc. If you want to learn more about check valves, you can contact us at Weidouli!

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