How Do 2-Way Valves Regulate Water Flow in Heating Systems?

[TSN79]

A water based heating system is to be regulated by 2-way valves. How do these work exactly? Do they simply constrict the flow? Isn't it so that if a pipe is constricted, the velocity simply increases to maintain the flow? I mean, flow in must equal flow out.

 

[stewartcs]

A water based heating system is to be regulated by 2-way valves. How do these work exactly? Do they simply constrict the flow? Isn't it so that if a pipe is constricted, the velocity simply increases to maintain the flow? I mean, flow in must equal flow out.

A general two-way valve just acts as stop-flow valve (e.g. solenoid valve). Nothing much to them.

Here is a diagram and a brief description of one:

http://www.omega.com/GREEN/pdf/VALVE_TECH_REF.pdf

CS

 

[oswaler]

A 2-way valve is a type of valve that has two openings, one for the inlet and one for the outlet. It works by controlling the flow of a fluid, such as water, by opening or closing the valve. When the valve is open, the fluid can flow freely through both openings. When the valve is closed, the flow is blocked and the fluid cannot pass through.

In the context of a water-based heating system, 2-way valves are used to regulate the flow of hot water from the boiler to the radiators. When the valve is open, hot water can flow into the radiator, heating up the room. When the valve is closed, the flow of hot water is stopped, allowing the room to cool down.

The valve does not simply constrict the flow, as you suggested. Instead, it controls the flow by opening or closing the valve. When the valve is partially closed, the flow of water is restricted, but the velocity of the water does not necessarily increase. The velocity of the water is determined by many factors, including the size and shape of the pipe, the pressure of the water, and the resistance of the system. Simply constricting the flow would not necessarily result in an increase in velocity.

It is important to note that the flow in must equal the flow out in a closed system, as you mentioned. This means that the amount of water entering the valve must be equal to the amount of water leaving the valve. However, the flow rate can be controlled by adjusting the valve to allow more or less water to pass through.

In summary, a 2-way valve works by opening or closing to control the flow of a fluid, such as water. It does not simply constrict the flow, but rather regulates it to achieve the desired flow rate.