Yesterday saw a valve, used in differential pressure control, the valve has 2 flow arrow, not very clear what this is the valve, what is the role?Two interface valve is common, there are two arrow on the valve body, are pointing to another interface from an interface, the two arrow is in the opposite direction, don't understand what it is, logically speaking valve open does not exist and is not a one-way flow valve. Which side of your water is that side, but there are two arrows flowing on it, you really don't understand what that means.
Two way valves can be installed both in the right and the reverse
Is it a angle valve? The two direction arrows are vertical
It's a three course, isn't it? Through the valve basically no such, because if it can be installed and why superfluous.
