the difference between brass check valve, brass isolation valve and brass drain valve

the difference between brass check valve, brass isolation valve and brass drain valve

1. brass check valve is a valve that by its design allows flow in only one direction. 

If the pressure direction in the pipe reverses, no flow or only minimal flow will occur in the reverse direction. 

A check valve is a device that prevents flow going backward in the line past the valve. 

It usually has no actuator, or external valve handle.

2. brass isolation valve is called that because of its use in a given design, to isolate a portion of the pipe system, not because of how it's built. 

Similarly a drain valve, is for, well, draining something. 

An isolation valve is usually one of a pair of manual valves installed so that a device mounted between them may be removed. 

Sometimes an isolation valve may be a singlet. 

as when the device on the line is at the end of a header.

3. brass drain valve is a valve that is connected with one side to the process fluid and one side to drain.

NINGBO YINZHOU PLUMBING HARDWARE CO.，LTD suply these brass valves for good quality and reasonable price.

And customer designs and logos are welcome.