Overflow Valves: Application and Benefits

Bypass valves are devices that keep the pressure in the system at a constant level. Otherwise they are called overflow valves. Unlike safety, the liquid or gas in them is diverted constantly. In the safety valve, the pressure in the system is maintained by the periodic withdrawal of gas or liquid. Structurally, these and other devices are no different.

Application

Overflow 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 included in its design. The operation of the valve performs the return of excess fuel to the fuel tank, which maintains a constant pressure in the system. The internal combustion engine is equipped with a cooling system, in which the bypass valves are also installed, due to which the coolant is returned to the cooling radiator from the expansion tank. Appliances are also used in the boiler room circuits, where they maintain a constant flow of the heat source in the circuit.

Benefits

Overflow valves have a number of advantages:

• Simplicity of the device, providing high reliability of the design;
• Do not require the connection of additional power supplies;
• Do not need maintenance;
• Easily mounted anywhere in the system;
• Low cost.

Valves for water

Various companies offer devices that regulate the water pressure up to itself, as well as after itself, valves regulating flow, discharge, safety and air. In heating systems, they are installed on a straight pipeline. At the moment when the water pressure rises to the valve, it opens, and the flow of water is sent through the branch pipe into the return pipeline. If the pressure level in the forward pipeline drops to the level set on the valve, it closes. Its design allows you to change the pressure settings with a special handwheel. Bellows stem seal does not require maintenance. The bypass valve for water is installed in water distribution systems. These devices are characterized by high performance, long life and reliability.

Valves in the compressor

The compressor by-pass valve is a critical element of the design, thanks to which the equipment is operating normally and without overloads. The economy of the unit depends on its tightness, so it must be closed in time and tight, have high wear resistance, withstand high temperatures and dynamic loads. There are such kinds of valves for the compressor:

• Safety valves, which are necessary to ensure the discharge of excessive pressure when it is above the permissible level. In this case, the device opens, releasing air, and when the pressure drops, it automatically closes.
• Check valves that hold back the pressure so that any compressor stops to prevent compressed air from flowing back into the compressor.
• Unloading (bypass) valves reduce the load on the shaft of the motor at the time of starting. Through them, the high-pressure cylinder communicates with the external environment and discharges excess pressure.