Bypass valves are devices that keep the pressure in the system constant. Otherwise they are called overflow valves. Unlike safety, liquid or gas is constantly discharged into them. In the safety valve, the pressure in the system is maintained by periodically discharging gas or liquid. Structurally, those and other devices are no different.
Application
Bypass valves are used in systems that require constant maintenance at a certain level of the internal environment. For example, in a car they are installed directly next to the fuel pump or are included in its design. The valve operates to return excess fuel to the fuel tank, thereby maintaining a constant pressure in the system. The internal combustion engine is equipped with a cooling system, in which bypass valves are also installed, thanks to which coolant is returned to the cooling radiator from the expansion tank. The devices are also used in the boiler room circuits, where they maintain a constant flow of heat source in the circuit.
Benefits
Bypass valves have several advantages:
- simplicity of the device, providing high reliability design;
- do not require the connection of additional power sources;
- do not need maintenance;
- easy to mount anywhere in the system;
- low cost.
Water valves
Various companies offer devices that regulate the water pressure before and after itself, valves that regulate the flow, waste, safety and air. In heating systems, they are installed on a direct pipeline. At that moment, when the water pressure rises to the valve, it opens, and a stream of water is sent through the pipe branch to the return pipe. If the pressure level in the straight pipe drops to the level set on the valve, it closes. Its design allows you to change the pressure settings using a special helm. The bellows stem seal is maintenance free. A water bypass valve is installed in water distribution systems. These devices are characterized by high performance, long life and reliability.
Valves in compressor
The bypass valve of the compressor is a critical structural element, due to which the equipment operates normally and without overloads. The efficiency of the unit depends on its tightness, so it must be timely and tightly closed, have high wear resistance, withstand high temperatures and dynamic loads. Distinguish these types of valves for the compressor:
- Safety valves, which are necessary to ensure the release of excessive pressure in cases where it is above the permissible level. In this case, the device opens, releasing air, and automatically closes when the pressure drops.
- Check valves that hold back pressure so that at any compressor stop, prevent compressed air from returning to the compressor.
- Unloading (bypass) valves reduce the load on the motor shaft at the time of starting. Through them, the high-pressure cylinder communicates with the external environment and performs the release of excess pressure.