The H stands for high pressure side and the L stands for low pressure side.
The valves keep blood flowing in one direction. And there are even valves in the veins. The system is called a circulatory system and the system must keep going in a circle to function properly.
In the bodies blood system, they prevent back flow of the blood (one way valves) .
veins
Valves in the circulatory system prevent blood from flowing into the wrong compartments. Valves also regulate the amount of blood that can be held in one compartment of the heart over a certain period.
Most single foot valves have one input port and one output Most double have two or more of each and are actually two separate valves in one body so if one fails the other will continue to work.
in the arterial system, your heart keeps pushing everything forward. in the venous system, you have valves everywhere to reduce backflow
Pressure There are also one way valves in the circulatory system.
To maintain the flow of blood in one direction
tom dunsdon
the heart and the veins
- A one-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction. - One-way valves are often used with some types of pumps.
The key word is "drain", meaning it works by gravity, so a drain value should be at the lowest point in the system. Typically there is one just past the meter. If a lawn irrigation system is a branch of the main system it should have its' own drain valve for winterizing it. You can purchase stop valves (or shutoff valves) with built-in drain or bleeder valves.