The complexity of modern heating systems is impossible without the use and use of bypass pipelines, one of which is bypass. If you do not have an idea of what a bypass is, and what is the principle of its operation, then this material simply needs to be mastered.
Content
What is a bypass, and for what purpose is it necessary?
According to the normative and sanitary rules for living in multi-apartment buildings, the presence of a thermostat on heating systems and devices is mandatory. Another option for water regulation in heating systems is a mechanical method, which is to install a bypass.
The mechanical installation method assumes the location of the bypass near the radiators. The efficiency and functioning of the bypass is realized with the introduction of shut-off valves into the system. Due to the use of the bypass in the heating system, it is possible to transport the coolant in the circuit in parallel with the control and shut-off valves. In terms of available language, the bypass is a jumper, assembled in the form of a piece of pipe installed between the heating radiator wiring.
The main functions of the bypass in the heating system are:
• regulation of the heating medium supply to the heating circuit
• Acceleration of the release of the pipeline from the coolant mixture before the planned repair.
Therefore, the question: "What is the need for a bypass in the heating system" does not arise.
The presence of a bypass in the heating system is especially necessary in the emergency case, when a periodic or emergency power outage occurs.
At the same time, the operation principle of the bypass is quite simple: switching off the electric power causes the following actions: shutting off the tap to supply the coolant. In this case, the heating system is transferred manually to the mode of natural circulation of the coolant. In addition, the installation of a bypass at the inputs of water supply systems in parallel with the water meter will increase its flow in emergency situations in homes.
What is the bypass and the principles of its operation are presented in the video.
The main purpose of the bypass can be called the function of returning excess coolant from the battery to the riser. The change in the amount of heat carrier is due to its automatic or manual control. Therefore, without the presence of a bypass system, it is impossible to perform repair work when the system is operational.
Bypass circuit
The most common scheme is the circuit in which the central coolant supply line is stored and the circulating pump is connected in bypass (parallel pipeline). To implement the scheme, pipes, valves and the pump itself are used.
However, when assembling the bypass circuit, it is necessary to consider some connection features, namely the selection of valves and valves.
In the heating system of a private house of any type, open or closed, installing the bypass during an emergency allows circulation.
Bypass Construction
The bypass device is simple. Structurally, the bypass device consists of the following elements:
• circulation pump
• coarse filter
• Shut-off valves.
The bypass in the heating system can operate continuously or during the start-up of the radiators. As shut-off valves in the system, the following elements can be used:
• ball valve
• non-return valve.
Therefore, it is considered necessary to have a check valve in the heating system. In the heating system, a non-return valve can be installed in place of a crane.
At the same time, when the circulating pump is switched on, the check valve is in the closed state. When the power is turned off, the valve opens automatically, allowing the system to enter the natural circulation mode.
Therefore, the issue of choosing a stop valve in the bypass design is fundamental. In the absence of a valve, the circulation pump is activated by a small heating circuit, which is formed by the main and bypass.
In the design of the check valve, a spring-loaded plate and a ball that overlaps the lumen should be provided. The advantages of having a check valve in the system consist in its functioning without the presence or participation of a person. Turning the circulation pump under the pressure of the coolant mixture "closes" the valve. But the reliability of the valve is inferior to the valve, because the presence of abrasive impurities in the coolant mixture takes place.
According to the specialists who install shut-off valves, the best option is to purchase a valve from the best manufacturers, because potekshy ball valve can not be repaired.
Installing the bypass in the heating system
Bypass installation is performed near the boiler on the return line, in the place where the coolant has the lowest temperature regime. The bypass installation location must not be in the minimum position, thus eliminating the possibility of overheating of the pump. Structurally, in order to prevent air from entering the heating system, the bypass is installed in a horizontal plane.
The installation of a few devices on the bypass is made towards the heat carrier and in this order:
• filter
• Check Valve
• circulation pump.
The basic unit for measuring the bypass line is the value of the diameter of the nominal passage (DN), on the basis of which the heat engineering calculation and the subsequent selection of the heating system elements are made. The diameter of the conditional pass of the bypass line is similar to the diameter of the return line and is about 50 mm.
The diameter of the tie-in pipes of the pump equipped with a stopcock and a coarse filter must correspond to the diameter of the pump. In practice, the coarse filter is installed in front of the pump, in the direction of flow of the coolant mixture. It is advisable to assemble all the cranes during the assembly and installation by fitting type fittings. This will eliminate difficult situations during repair. Professional plumbers and locksmiths use the American, which allows painlessly to perform regulated repairs.
For heating with natural circulation in the appropriate mode, it is necessary that the tap is in the "open" state, the circulation pump is switched off. For operation in the forced circulation mode, these valves must be closed. The circulation pump must be in the "on" state.
How to build the bypass with your own hands will prompt the proposed video.
Pump assembly via bypass.
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