Problems with the valve assembly
Thread Content
I found that when creating installation diagrams for instruments, a valve assembly needs to be connected at the measurement points where the transmitters are connected; there are valve assemblies with 2 valves, 3 valves, 5 valves, and so on. I would like to ask why valve assemblies need to be connected, and what the connection principles for different valve assemblies are.
A two-valve assembly consists of one shut-off valve (which can be opened or closed) and another for drainage (usually used to remove waste, water, or gas). A three-valve assembly includes two shut-off valves plus a balance valve in between (which is also a shut-off valve); the two shut-off valves are located on the high-pressure side and the low-pressure side respectively, and when they are opened, pressure from either the high-pressure or low-pressure side can pass through. When the balance valve is opened, it connects the high-pressure side with the low-pressure side, and it is generally used for measuring differential pressure. A five-valve assembly builds upon the three-valve assembly by adding drainage valves to both the high-pressure and low-pressure sides (with the same function as those in the two-valve assembly). The procedure for putting a differential pressure transmitter into operation is as follows: First, open the two drainage valves on the transmitter, then open the balance valve, and slowly open the two shut-off valves to remove any air or waste from the pressure guiding pipes. After that, close the two drainage valves and then the balance valve, and the transmitter is ready for use. The procedure for performing an online zero-point calibration of a differential pressure transmitter is as follows: First, open the balance valve and close the two shut-off valves, after which the zero-point calibration of the transmitter can be carried out
Hehe, agree with what was said above – completely