How does a quick vent valve work? Automatic exhaust valve principle

The working principle of the exhaust valve is: when negative pressure is generated in the system, the water level in the valve cavity drops, and the exhaust port is opened, because the outside atmospheric pressure is greater than the system pressure at this time, the atmosphere will enter the system through the exhaust port to prevent the harm of negative pressure. If the bonnet on the body of the exhaust valve is tightened, the vent valve stops venting, and normally, the bonnet should be open.

The valve is installed at the pump outlet or in the water supply and distribution pipeline to remove a large amount of air collected in the pipeline, or to discharge a small amount of air gathered in the higher part of the pipeline into the atmosphere, so as to improve the efficiency of the pipeline and the pump, and once there is negative pressure in the pipeline, the valve quickly inhales the outside air to protect the pipeline from damage due to negative pressure.

The principle of the sewage composite exhaust valve is the same as that of the clean water composite exhaust valve, but the structure is slightly changed, that is, the valve body is lengthened, and the lever mechanism is slightly modified, so that the dirt only accumulates in the lower part of the valve body, which does not affect the exhaust and does not cause water leakage.

When the pontoon is in the exhaust state, due to the action of gravity, one end of the lever is pulled down, and the lever is in an inclined state, and a gap appears in the contact part between the lever and the exhaust hole, and the air is discharged from the exhaust hole through this gap. With the discharge of air, the water level rises, the pontoon floats upwards under the action of water buoyancy, and the sealing end face on the lever gradually presses on the exhaust hole until the entire exhaust hole is completely blocked, and the exhaust valve is completely closed at this time, which is the working principle of the complete exhaust valve.

Here are some of the well-known brands recognized in the exhaust valve industry that are widely recognized and have a great reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be among the top brands in the valve industry: Water System Valves and Industrial ValvesThe following more influential first-line brands can be used as a reference, but are for reference only:

Suzhou Neway Valve, Shanghai Qizhong Valve, Shanghai Guanlong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Working principle: When the system is filled with water, the gas in the water continues to escape to the highest place due to temperature and pressure changes, when the gas pressure is greater than the system pressure, the float will fall and drive the valve stem to move downward, the valve port is opened, and the gas is continuously discharged.

When the gas pressure is lower than the system pressure, the float rises and drives the valve stem to move upward, and the valve port is closed. This is how the automatic exhaust valve works in a continuous cycle.

During the operation of HVAC system and HVAC system, many adverse effects of gases such as hydrogen and oxygen released when water is heated will damage the system and reduce the thermal effect, and these gases will have many adverse consequences if they are not discharged in time.

AnswerWhen there is gas generated in the system, because the density of gas is smaller than that of water, the gas will go up the pipe and eventually gather at the high point of the system, so the automatic exhaust valve is generally installed at the high point of the system, where the automatic exhaust valve has the highest exhaust efficiency.

When the gas enters the cavity of the automatic exhaust valve and gathers in the upper part of the automatic exhaust valve, the gas pressure rises as the gas in the valve increases. When the gas pressure is greater than the system pressure, the gas will make the water surface in the cavity drop, the buoy will drop with the water level, and the exhaust port will open and start exhausting; As the gas is discharged, the air pressure decreases, the water level rises, the pontoon rises with it, and the exhaust port closes.

Oral < 1 >, < 2 >, < 3 >.

1> is connected to the air source, < 2 > is connected to the actuator, and the <3 > is connected to the atmosphere. When there is compressed air input in <1 >, push the valve core to move to the right, <1> and <2 > communication, and supply air to the actuator; When there is no compressed air input > <1, the gas of the actuator moves the valve core down through the <2> blocking the <1><2> channel, and at the same time opening the <2><3> channel, and the gas is quickly discharged through the <3>.

The quick exhaust valve is often installed between the reversing valve and the cylinder, so that the exhaust of the cylinder does not need to be discharged quickly through the reversing valve. Thus speeding up the reciprocating motion of the cylinder and shortening the working cycle.

In general, the quick exhaust valve is installed directly on the cylinder or should be installed close to the cylinder.

The principle of the exhaust valve is as follows:

1. When the exhaust state is exhausted, the pontoon pulls down one end of the lever due to the action of positive and old gravity, and the lever is in an inclined state at this time;

2. There is a gap in the contact part between the lever and the exhaust hole, and the air is discharged from the exhaust hole through this gap;

3. With the discharge of air, the water level rises, the pontoon floats upwards under the buoyancy of the water, and the sealing end face on the ridge lever gradually lifts the upper exhaust hole until the entire exhaust hole is completely blocked; The exhaust valve is now completely closed.

The working principle of the quick exhaust valve is as follows:

The cylinder quick exhaust valve is a full-pressure high-speed exhaust valve composed of the lower valve body, the middle valve body, the float, the pontoon rod, the pontoon rod, the valve core, the cover plate, the piston rod, the diaphragm and the valve cover, etc., which is characterized by the pontoon rod hinged by the pin shaft and the pontoon can rotate around the main shaft, and thereby realizes the lifting and opening and closing of the valve core through the lifting and lowering of the pontoon.

That is, when the pontoon goes down (the valve body is full of gas and no excitation), the valve core rises, opens the small valve open mouth, and closes the exhaust port on the small exhaust cap, so that the gas enters the hydraulic tank through the conduit, and when the pontoon rises under the action of buoyancy, the valve core descends and closes the small valve port.

At the same time, open the exhaust port on the exhaust cap, so that the hydraulic tank through the conduit, straight to the atmosphere to relieve pressure, and when the pontoon is lowered and the hydraulic cylinder is filled with gas, the large exhaust port on the valve is automatically closed. When the pump is stopped, the water in the pipe is excited to detect the backflow or when the negative pressure in the pipe is generated, the air is inhaled to ensure the safety of the pipeline.

Scope of application

Fast exhaust valves (large-diameter exhaust valves) are used in independent heating systems, central heating systems, heating boilers, air conditioners, floor heating and solar heating systems.

Because there is usually a certain amount of air dissolved in water, and the solubility of air decreases with the increase of temperature, so that the gas is gradually separated from the water in the process of water circulation, and gradually gathers together to form large bubbles or even air columns, because there is a supplement of water, so there are often gases produced. For this reason, the term exhaust valve was born, and many problems have been solved in daily life.