Pressure relief valve with pressure regulation: design, application

Any boiler equipment that is installed in enterprises or in a private home is a source of great danger. The water jacket, which is part of the boiler, is a vessel that is under pressure, which indicates its explosiveness. In order to reduce such a risk to a minimum, modern heat generators and their binding schemes assume the presence of protective devices and all sorts of systems. As one of the simplest and most popular is a safety valve with pressure regulation.

Each owner of the boiler equipment described in the article must understand how dangerous the operation of the device can be. That is why when installing the device it is important to think about the necessity of having a safety valve in the system, which you can choose and mount yourself without assistance. However, it is important to ask the manufacturer whether the guarantee for the units will be maintained after such work is carried out.

Application

In order to understand where to install the device described, it is necessary to understand what the valve is used for. The purpose of the installation is to protect the heating system. With this add-on, you can eliminate the increase in water pressure. It can occur when the coolant overheats in the boiler. In particular, this applies to those appliances that operate on solid fuels.

As soon as the coolant reaches the boiling point, vaporization begins, which leads to a sharp increase in the pressure in the system.

Need to use

If you do not use a pressure relief valve with pressure adjustment, the consequences may be ruptures and leakage of the pipeline system. Most often this occurs at the junction. You can also face the destruction of polymer fittings, as well as pipes. The most dangerous is the explosion of the boiler tank, as well as the closure in the boiler room. From troubles will help protect a small valve, which has a fairly simple design. Considering the moment that the pressure rise to the critical level occurs in the boiler, the safety valve should be installed closer to the instrument on the supply line.

A number of manufacturers of boiler equipment complement the products of the safety group. It includes an automatic air vent, a manometer and a relief valve. The group is installed directly into the water jacket of the boiler equipment.

What you need to know about the features of use

A safety valve with pressure regulation is not always used in systems. For example, when an electric or gas boiler acts as a heat source in the house, a reset device is not required at all. This is due to the reason for the availability of safety automation in these types of heat generators. Among other things, they lack any inertia. Owners of such devices should be aware that when the set water temperature is reached, the electrical element or gas burner simply turns off and the heating stops almost immediately.

Need to use

A safety valve with pressure control is used when a furnace or a solid fuel boiler with a water circuit is used. Here the installation of the described device is mandatory. As soon as the firewood in the furnace is inflamed and the coolant in the network reaches a certain temperature, it will be necessary to reduce the heating. It is important to close the air intake to the combustion chamber, this will allow the flame to die out. However, due to inertia, the temperature increase will continue.

If this process takes place near the limit values, vapor generation in such moments is inevitable. We are talking about temperatures within 90-95 degrees. As mentioned above, effervescence will lead to an increase in pressure, and a safety valve for the boiler can prevent this. It is designed to automatically open the way for the resulting steam that comes out, thereby lowering the pressure to the normative value. After that, the device closes itself to come to the standby state.

Design features

The construction of the described supplement to the boiler equipment is very simple. The body is made using high quality brass. In the process of technology, hot stamping is used using 2 cast parts in a semi-solid state. The spring acts as the main working element of the valves. Its elasticity will determine how much pressure is exerted on the membrane. The latter closes the passage outward.

In the normal position, the spring is in the seat with the seal. The metal washer serves as the upper stop for the spring. It is fixed to the rod, the end of which is attached to the plastic handle. With it, the valve position is corrected. Sealing elements are made of polymeric metals, but as for the spring, it is based on steel.

Principle of operation

The safety valve for the boiler has a very simple design, this also applies to the principle of operation. In standby mode, which is normal, the water parameters are in a certain range. The membrane serves to close the entrance to the inner chamber. After there is a situation that can be called close to emergency, the pressure in the system increases, a mixture of steam and water begins to prop up the membrane. The force of the fluid pressure overcomes the elasticity of the spring, which helps to open the membrane. The coolant enters the chamber, and then flows out through the side opening.

A gas valve is simply necessary to allow some water to leave the system, this will lead to a drastic reduction in pressure and closure of the membrane. As a rule, the mechanism functions perfectly, especially in the case when the thermal equipment is operating at the limit, and the water temperature reaches 90-95 degrees. The gas valve can operate quite often. In practice this leads to the fact that it loses its tightness. You may notice this problem when water flows.

For reference

If you have checked the safety valves and you have noticed fresh traces of engine leaks, this indicates an extreme heat generator operation or a malfunction in the system. The problem can be related to the expansion tank.

Installation Recommendations

The installation of the safety valve should not assume the presence of a stop valve in the place where the pipeline section is located from the boiler equipment to the location of the valve itself. Among other things, it is forbidden to install the device after the circulation pump. The device in this condition will pump the mixture from steam and water.

In order to avoid the possibility of water spraying through the combustion chamber, it is necessary to attach a tube to the outlet of the device, which will discharge emissions to the sewer. If you want the safety valve to be adjusted not only mechanically, but also visually controlled, a drainage funnel must be installed on the vertical section of the tube to allow the jet to break.

Conclusion

The setting of the safety valves, their installation and operation is a very simple task due to the design features. Experts are not advised to pursue a cheap product, so when choosing a device, be guided by its quality and feedback from those who have already tried this system. In this case, the main thing is safety and efficiency.