The breathing valve is a ventilation device fixed on the top of the storage tank to ensure the normal state of the pressure in the tank, prevent the storage tank from being damaged by overpressure or vacuum in the tank, and also reduce the loss of liquid in the tank. The breathing valve can not only maintain the pressure balance of the storage tank, ensure that the storage tank is damaged under overpressure or vacuum, but also reduce the medium and loss in the tank.

The working principle of the breathing valve is to use a spring limit valve plate, which is determined by the positive and negative pressures to exhale or inhale. The breathing valve should have the functions of releasing positive pressure and negative pressure. Specifically: when the container is under positive pressure, the breathing valve opens to exhale The gas releases positive pressure; when the container is under negative pressure, the breathing valve opens to inhale the gas to release the negative pressure. This ensures that the pressure is within a certain range and the safety of the container. One is to exhale or inhale when a certain pressure is reached. The other is designed to only exhale but not inhale. It can be understood as replacing with two one-way valves with appropriate pressure.

The working principle of various breathing valves:

The breathing valve plays a role in the steam heating system to prevent steam and drain water. Choosing a suitable breathing valve can make the steam heating equipment reach the highest working efficiency. To achieve the most ideal effect, it is necessary to have a comprehensive understanding of the performance and characteristics of various types of breathing valves.

There are many varieties of breathing valves, each with different performance. When choosing a breathing valve, you should first select its characteristics to meet the best operation of the steam heating equipment, and then consider other objective conditions, so that the choice of the breathing valve you need is correct and effective. The breathing valve must be able to "recognize" steam and condensate in order to prevent steam and drain water. "Identifying" steam and condensate is based on three principles: density difference, temperature difference and phase change.

The pipeline flame arrester uses the density difference between the condensed water and the steam, and through the change of the condensed water level, the float is raised and lowered to drive the valve flap to open or close, so as to achieve the purpose of steam blocking and drainage. The mechanical steam trap has a low degree of subcooling and is not affected by changes in working pressure and temperature. It drains when there is water, and there is no water in the heating equipment, which can make the heating equipment achieve the best heat exchange efficiency. The maximum back pressure rate is 80%, and the working quality is high. It is the most ideal breathing valve for the heating equipment of the production process

The GTQ type snorkel has a simple structure. There is only one finely ground stainless steel hollow floating ball with a movable part inside. It is both a float and an opening and closing part. It has no vulnerable parts and has a long service life.

When the equipment is just started up, the air in the corrugated flame arrester pipeline is discharged through the Y series automatic air exhaust device, the low-temperature condensate enters the breathing valve, the level of the condensed water rises, the float rises, the valve opens, and the condensate is quickly discharged, and the steam Enter the equipment soon, the equipment heats up quickly, the temperature-sensitive liquid of the Y series automatic air exhaust device expands, and the automatic air exhaust device closes. The breathing valve starts to work normally, and the floating ball rises and falls with the condensed water level, blocking steam and draining water. When the device is just started, the air and low-temperature condensed water in the GZW-I anti-deflagration pipeline flame arrester pipe enters the breathing valve through the launch tube, the bimetallic exhaust element in the valve bounces the ball barrel, the valve opens, and the air and The low-temperature condensate is quickly discharged. When steam enters the ball barrel, the ball barrel generates upward buoyancy, and at the same time the temperature in the valve rises, the bimetallic emptying element shrinks, the ball pokes and floats to the valve port, and the valve closes. When the steam in the barrel turns into condensed water, the barrel loses buoyancy and sinks, the valve opens, and the condensed water is quickly discharged. When the steam enters the barrel again, the valve is closed again, and it works intermittently and continuously.

When the device is just started, the air and low-temperature condensate in the tank wall manhole pipe enters the trap, the inverted bucket falls under its own weight, and the inverted bucket connects lever to drive the valve core to open the valve, and the air and low-temperature condensate are quickly discharged. When the steam enters the inverted bucket, the steam in the inverted bucket generates upward buoyancy, and the inverted bucket rises and the connecting lever drives the valve core to close the valve. There is a small hole in the inverted bucket. When a part of the steam is discharged from the small hole, the other part of the steam produces condensed water. The inverted bucket loses buoyancy and sinks down by its own weight. The inverted bucket is connected to the lever to drive the valve core to open the valve and cycle. Work with intermittent drainage.

The air foam generator has two isolated valve chambers, which are connected by two stainless steel pipes to the upper and lower valve chambers. It is a combination of a floating ball type and an inverted bucket type breathing valve. The valve structure is advanced and reasonable. It is suitable for overheating, high pressure, and small load. Under the working conditions, the condensed water formed when the superheated steam disappears can be discharged in time, effectively preventing the leakage of the superheated steam, and the working quality is high. The maximum allowable temperature is 600℃, the valve body is made of all stainless steel, and the valve seat is made of hard alloy steel. It has a long service life. It is a special breathing valve for superheated steam. It has obtained two national patents and filled the domestic gap.

When the condensed water enters the lower valve cavity, the floating ball of the auxiliary valve rises with the liquid level, and the floating ball closes the steam inlet pipe hole. The condensed water rises to the main valve cavity through the water inlet pipe, and the inverted bucket falls under its own weight, driving the valve core to open the main valve to discharge the condensed water. When the condensed water level of the auxiliary valve cavity drops, the floating ball drops with the liquid level, and the auxiliary valve opens. The steam enters the inverted bucket in the upper main valve cavity from the steam inlet pipe. The inverted bucket generates upward buoyancy, and the inverted bucket drives the valve core to close the main valve. When the condensed water level in the auxiliary valve cavity rises again, the next cycle starts again, and the water is discharged intermittently.