What is the installation sequence for the valves and check valves in the process pipelines, before and after them? ? ?
Thread Content
1. Regarding the outlet pipeline of the circulation pump: the correct sequence should be pump outlet → slowly opening and closing check valve → butterfly valve (this arrangement is said to facilitate maintenance and replacement of the check valve), or pump outlet → butterfly valve → slowly opening and closing check valve (this arrangement is said to protect the butterfly valve from water hammer). I: 2. In our company, due to different manufacturers, the installation sequence of check valves and other valves on the outlet pipelines of the circulation pumps in various systems also varies. III. I have a question for the experts: Are there any national standards GB that specify this? Which installation sequence is correct? There seems to be disagreement regarding the proper installation order of the shut-off valves and check valves in the water inlet pipeline of waste heat boilers as well ? ? ? I’m not sure if it will be deleted; it’s a repeat – the pipeline section was posted once too. Please forgive me! ! Urgent need – are there any standards?
We installed the check valve first, then the butterfly valve; there is also a return port in front of that butterfly valve
In the design drawings, it is most common to see check valves installed first at the pump outlet, followed by control valves, and this is also the way they are installed in practice.
Our company exports horizontal pipes with a DN450 diameter; there is a check valve followed by a butterfly valve at the pump outlet
First the check valve, then the shut-off valve (butterfly valve); if the medium is toxic or harmful, a drain valve should also be added between the check valve and the shut-off valve. You don’t need to add anything to your circulating water.
The pump outlet is first connected to a check valve and then to a gate valve
Correct order: pump, flexible coupling, pressure gauge, check valve, butterfly valve. The flexible coupling is installed at the pump outlet to reduce the effects of pump vibration. Since the check valve sometimes needs to be serviced, it is placed before the outlet valve so that water flow can be stopped for maintenance purposes
The statement on the 7th floor is completely correct. In fact, regarding the installation sequence, there are no national or industry standards that dictate it; rather, it is determined based on the design intent. When a check valve needs to be serviced, effective isolation measures must be in place, and installing the valve after the check valve can meet this requirement.