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Dear sea friends: On the outlet pipeline of the centrifugal compressor, the check valve is located ahead and the supply valve is located behind. In some units, the supply valve is placed at the front and the check valve at the back during design. What are the advantages and disadvantages when comparing the two?
The check valve is located at the front and the air supply valve at the back; if there is a problem with the check valve, the air supply valve can be closed for maintenance without affecting subsequent processes.
Agree with what was said above. In our oil system pipelines, the shut-off valve is located ahead and the check valve behind, which is exactly the opposite of the usual arrangement. I’m not sure what the advantages of this design are; I hope experts can answer.
The supply valve is located at the front and the check valve at the back, to prevent gas from flowing backward in the event of a sudden shutdown of the unit, which could otherwise cause damage due to reverse rotation of the unit. Generally, check valves are installed behind the valve.
:The handshake check valve is placed at the front and the air supply valve at the back, to prevent gas from flowing back in case of a sudden shutdown of the unit, which could otherwise cause damage due to reverse rotation of the unit.
Whether it is at the front or at the back, the check valve serves the same purpose of preventing sudden shutdowns of the unit by stopping the backflow of gas, which could otherwise cause the unit to reverse and get damaged.
Check valves are generally provided by the manufacturer, while air supply valves are usually purchased by the user. In small and medium-sized units, the check valves are installed on the machine before it leaves the factory; therefore, the air supply valve is located behind the check valve. That’s one of the reasons, I guess. Also, the air supply valve is located at the back, which makes it convenient to service the check valve
With the check valve at the back, it is possible to perform online maintenance on the outlet valve and equipment. With the check valve at the front, the outlet can be closed to allow for valve repair. Check valves are required at the equipment outlet; they make noise when the air flow fluctuates, and if they get damaged it can cause problems
The air supply valve is at the front and the check valve is at the back; although this does not affect the checking function, it makes maintenance difficult if the check valve fails； The air supply valve is located at the back, the check valve at the front, with a vent placed in between. If the temperature rises after the air supply valve is closed, pressure buildup may occur, making it difficult to open the valve and even causing leaks at the flanges.
On the outlet pipeline of a centrifugal compressor, the check valve should be located ahead of the supply valve, as the supply pressure is higher than the system pressure; the check valve prevents the feed gas from flowing back after the machine stops operating. I’m not sure what the advantages would be in reverse.
Reply to 3# yeying34: I’m not sure. From what I’ve checked in our oil systems, check valves are placed at the front and isolation valves at the back; this seems to be the standard installation method