Should Check Valve Be Installed Before or After Butterfly Valve?

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A check valve, also known as a non-return valve, is an automatic valve that relies on the pressure of the flowing medium in the pipeline to push the disc for opening and closing. When the medium stops flowing, the disc closes, effectively preventing backflow and playing a vital role in ensuring pipeline safety.

Today, let's discuss the installation position of check valves. How to determine the installation position? What are the differences between installing a well pump check valve before or after a pump, and where is pre-pump installation applicable? Check valves are usually used in conjunction with other valves—where should they be installed in such cases?

The purpose of installing a check valve is to ensure the flow direction of water inside the water pump, thus guaranteeing its normal operation. Regarding whether the check valve should be installed before or after the pump, there are two scenarios:

Installed at the end of the vertical suction pipe before the pump (bottom valve): This aims to avoid refilling the pump each time it is started. When the pump and suction pipe are empty, the pump can only idle without pumping water, so it must be filled with water first. This installation method is used when the pump is positioned above the liquid level, also known as the negative pressure method.
Installed after the pump: When the liquid level is higher than the pump, this installation allows the pump to be started or stopped without closing the outlet valve, especially for header pipe pump systems, to prevent backflow.

The check valve must be installed at the pump outlet, before the outlet control valve, to facilitate maintenance. Typically, the first component at the pump outlet is a flexible connector (shock absorber), followed by the check valve, and then a shut-off valve (such as butterfly valve, gate valve, globe valve, etc.).

1. Install check valve first, then gate valve or butterfly valve.

Advantages: Protects the check valve. In parallel pump systems, when one pump is off with its outlet valve closed, the impact from starting another pump is borne by the gate/butterfly valve. If the check valve fails, the inlet/outlet valves can be closed to isolate the system for repair.
Disadvantages: Who protects the gate/butterfly valve? There was a case where a butterfly valve disc was damaged by impact.

2. Install gate valve or butterfly valve first, then check valve.

Advantages: Protects the butterfly/gate valve, as the check valve bears the impact.
Disadvantages: Who protects the check valve? The check valve opens/closes based on pressure difference (closes when main pipe pressure is high, opens when pump pressure is high). Frequent opening/closing due to unstable flow can shorten its lifespan. Moreover, repairing a faulty check valve in a header system requires shutting down the entire system.

Generally, sincecheck valves open/close frequently, their internal connections and seals are prone to damage. To facilitate maintenance and prevent system shutdown due to check valve failure, check valves are typically installed before the outlet gate/butterfly valve. Is this what you usually observe?

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Should Check Valve Be Installed Before or After Butterfly Valve?

2. Install gate valve or butterfly valve first, then check valve.

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