1) the valve plate, valve gate valve, the difference (my personal understanding is that if it is on the ball, called the valve, if the valve is called the gate, is actually a meaning in different valve called, please help me understand it right?)2) valve clack. What's the spool?3) the valve seat is welded inside the valve, or is it directly installed inside without welding?4) when opening the valve, if the valve seat is not welded, then, under the pressure of the medium, why not open the seat?.5) excuse me, pressure self sealing (my personal understanding is that when the valve is closed, the valve plate and valve seat depend on the pressure of the media, and they fit together to seal the effect
The first question is basically the same, and you can understand that for the secondThe 3,4 problem, there are several seat connections, such as thread connection (threaded, the valve seat is connected with the valve), modular connection (such as adding the cage to a fixed seat, the crushed) as one of the body and there is (some welding). The valve seat must be fixed.The fifth question, you are right!
To answer your question was the top valve is not open on the thread of an analogy between ordinary wood screws and nails is a straight out of another can only rely on the screwdriver to turn out the cut-off valve is from the mechanical analysis of text as a specific principle is not specific
1. can be understood that way2, check valves, stop valves, and throttle valves are called valves3., welding, thread, and there is a cylindrical indentation, as well as plastic deformation press in4, without opening, there is a sphere or other block, open the moment, the pressure will come down, the media through the channel, attack or blocked by the ball, huh, huh5, the pressure self tight refers to the middle flange, where the greater the pressure, the more reliable sealing, within a certain rangeWhen the cut-off valve diameter is less than 150, the medium is low, the inlet is higher and the outlet diameter is greater than 200Some of them are self locking by thread, and some of the globe valves are equipped with locking devices
