Check Valve Installation: Before or After the Pump?

 
What is a Check Valve? 

Check valves make certain the unidirectional flow of fluids in piping systems. These valves open when fluid flows ahead and close immediately when flow stops.How to determine the installation position of the check valve? When the check valve is used in conjunction with different valves, where should the check valve be installed? Let’s discover these concerns in detail.

The check valve need to be set up at the outlet of the pump, before the outlet control valve, to facilitate the maintenance of the check valve. The first connection at the outlet of a general pump is a flexible connection (shock absorber), followed by a check valve, and then butterfly valve, gate valve, globe valve, etc.

1.Install the check valve first and then the gate valve or butterfly valve

Advantages: It can protect the check valve, beacuse when pump starts, the impact force is borne by the gate valve or butterfly valve.

Disadvantage: The valve plate of the butterfly valve is easy to break.

2. Install the gate valve or butterfly valve first and then the check valve

Advantages: It can protect butterfly valves or gate valves, and the impact force is borne by the check valve.

Disadvantages: The check valve is opened and closed by pressure difference. If the flow rate is unstable, the check valve will be opened and closed repeatedly, which have an effect on the life of the check valve.

Generally speaking, in order to prevent the entire system from shutting down due to the check valve failure, a check valve is set up before the outlet gate valve or butterfly valve. Qingdao Fluido is your trusted partner. If you need pipeline products, contact us to discuss your requirements and get best solutions for your needs.