How much does the vacuum degree of the vacuum valve reach, and the air is replenished

Ultimate vacuum—, working vacuum—0,085—, the level of vacuum has a certain relationship with water temperature.

Including vacuum pumps, vacuum instruments, vacuum valves, vacuum pipes and various interfaces, with these devices can form a complete vacuum unit.

Start the system, the main vacuum pump group starts to work, until the vacuum degree in the vacuum tank reaches the upper limit of the set value, the vacuum pump automatically stops running, and the vacuum in the vacuum system is automatically cut off by the vacuum check valve on the pipeline and maintained. If the vacuum level in the vacuum tank drops and is lower than the set lower limit due to work requirements, the standby vacuum pump unit will be automatically started. In this way, the vacuum level of the vacuum system can maintain a stable vacuum source to meet the requirements of production.

Which is the best manufacturer of valves in Shanghai? There are many valve manufacturers in Shanghai, specifically which one is the best, in fact, it is very difficult, this depends on where you can evaluate it conveniently, each manufacturer produces different valve products, and the fields involved are also very different, for example, some are doing water systems, some are doing industrial systems, and industrial systems are divided into many fields, such as: electric power, chemical industry, petroleum, pharmaceuticals and many other fields.

Here is a brief introduction to a few companies, Shanghai Qizhong valve in the field of water system, Suzhou Neway valve, Shanghai Guanlong valve this unit is not bad, industrial valve field can also be.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be one of the top brands in the valve industry: water system valves and industrial valves The following more influential first-line brands can be used as a reference, and the following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only:

Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Suyan, 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.

The vacuum pump can be controlled to set the required vacuum level according to the specific usage environment.

After the pressure of the cooling system rises, the pressure valve is opened to relieve pressure to prevent the cooling system from being damaged because the pressure is too high, after the ignition is turned off, the temperature of the cooling system drops, and the pressure decreases, so as to produce a vacuum, the vacuum degree reaches a certain level, the vacuum valve is opened, and the antifreeze in the auxiliary water tank is sucked into the cooling system.

Vacuum drying oven operation method:

1) Put the items that need to be dried into the Baoyuantong vacuum drying oven, close the door of the box, close the air release valve, open the vacuum valve, turn on the vacuum pump power supply and start pumping, so that when the vacuum degree in the box reaches PA, close the vacuum valve, and then turn off the vacuum pump power supply.

2) Turn the power switch of the vacuum drying oven to the "on", select the desired set temperature, the temperature in the box begins to rise, when the temperature in the box is close to the set temperature, the heating indicator light flashes on and off, repeats many times, generally within 120min can enter the constant temperature state.

3) When the required working temperature is low, the second setting method can be adopted, such as the required temperature 60, the first time can be set to 50, and the second time to set 60 after the temperature overshoot begins to fall.

4) According to the humidity of different items, choose different drying times, such as the drying time is longer, the vacuum degree drops, and it is necessary to pump air again to restore the vacuum degree, the vacuum pump power supply should be turned on first, and then the vacuum valve should be opened.

5) After drying, the power supply of the drying oven should be turned off, the air release valve should be opened, the vacuum state in the box should be lifted, and then the door of the box should be opened to take out the items. (After the vacuum is lifted, if the sealing ring and the glass door are tightly deformed, it is not easy to open the door immediately, and after a period of time, the door can be easily opened after the sealing ring returns to its original shape.) ）

1. The imported ultra-low humidity drying oven is placed on the dry ground and work surface indoors, and the carbon dioxide incubator does not need to use other fixed devices.

2. A gate knife or air switch should be installed in the power supply line for the exclusive use of this box, and a wire twice the thickness of the cross-sectional area of the power line should be used as the grounding wire.

3. Before powering on, check the electrical function of the box, and pay attention to whether there is an open circuit or leakage.

4. When everything is ready, you can put in the sample, close the door of the box, and open the exhaust valve if necessary, and the open space is about 10mm.

5. In the water-isolated incubator, the distilled water or deionized water is connected to the water inlet in a constant temperature water bath, and the water is added to the overflow to stop.

Application after power-on:

6. After connecting the power supply, the heating switch can be opened, and the drying oven will dial the temperature setting dial to the required working temperature value. The water bath shaker constant temperature incubator and the water-isolated incubator put the temperature "setting-measurement" switch to "setting", adjust the temperature setting knob to the required working temperature, and then put the "setting-measurement" switch to "measurement", at this time, the temperature in the box begins to rise, and the green light is on (intelligent or special requirements, the manual is attached).

7. When the temperature rises to the required working temperature, adjust to the green light to subside, and then fine-tune until the green light turns on, the indicator light replaces the light and off place is the constant temperature point, at this time, you can fine-tune the knob to the green light to calm down to make it constant temperature (it is likely that the temperature will continue to rise at the constant temperature, which is the influence of residual heat, and this phenomenon will be stable for about half an hour). When the temperature in the room is stable (the so-called "thermostatic condition"), the thermostat can be adjusted slightly to improve the temperature control, and any operating temperature can be selected with this method.

8. When the drying oven is at constant temperature, the electric constant temperature blast drying oven should be closed with a high temperature switch, leaving only a group of electric heaters to work, so as not to have too much power and affect the constant temperature accuracy, when the working temperature is less than 150, only a group of heaters need to work, and the high temperature switch should be closed.

9. After the temperature arrives, according to the needs of the experiment, it can be kept at a constant temperature (the working time of the W type can be set), and in this process, the super constant temperature water bath can be automatically controlled by the thermostat without adding manual management.

This vacuum requirement is very low, it belongs to low vacuum, and generally domestic vacuum valves can be selected. In addition, it is guaranteed that there is no pressure relief for 12 hours, which cannot be fully achieved by any vacuum system. The leakage requirements of a vacuum system are generally expressed in terms of the pressure rise rate, that is, how many Pa the pressure rises per hour.

The premise of ensuring that the vacuum tank is not relieved is that the vacuum tank is well sealed, as long as the seal is good, the internal surface treatment is good, and there is no leakage, and the amount of air released is small, and the ordinary vacuum valve can meet the requirements. Vacuum angle valves will do.

High vacuum baffle valve, high vacuum plug valve.

It can be achieved, but I don't know the environment, caliber, and temperature you use, can you explain the specific situation clearly?

The 1151 capacitive tank metering system is composed of a pressure system, a sensor, a signal conversion interface circuit and a control computer. Capacitive differential pressure transmitter, mainly composed of measuring chamber, measurement.

The vacuum system refers to the vacuum of the generator, the vacuum formed by the operation of the air pump. The role of vacuum is to assist the braking system to achieve the best braking effect.

The main thing is that the oak uses the principle of engine inhalation to extract the real number, such as emptiness. For example, vacuum brake potato car power, after the engine extracts the air in the booster, you will feel very light when you step on the brakes.

A vacuum valve is a valve whose working pressure is lower than the standard atmospheric pressure.

First, the nature is different.

1. Safety valve: the opening and closing parts are in a normally closed state under the action of external force, when the medium pressure in the equipment or pipeline is higher than the specified value, the medium pressure in the pipeline or equipment can be prevented from exceeding the specified value by discharging the medium out of the system.

2. Vacuum valve: In the vacuum system, it is used to change the direction of the air flow, adjust the size of the air flow, cut off or connect the pipeline of the vacuum system.

Second, the role is different.

1. The function of the safety valve: the safety valve plays a role in safety protection in the system. When the system pressure exceeds the specified value, the safety valve is opened, and a part of the gas and liquid in the system is discharged into the atmosphere and pipeline, so that the system pressure does not exceed the allowable value, so as to ensure that the system is not due to excessive pressure.

2. Vacuum valve function:

1) Turn on and off the gas circuit and change the flow route of the air flow.

2) Control the size of the airflow and adjust the vacuum level.

3) When the plunger of the glass valve is quantitatively inflated, there is a small hole of a certain volume, and when the small hole is turned to the right and connected with the high-pressure cylinder, the small hole can be filled with high-pressure gas; When it turns to the left and connects with the vacuum vessel, it puts the volume of the high-pressure gas into the vessel, which acts as a quantitative inflation.

Third, the application is different.

1. Safety valve application: mainly used in boilers, pressure vessels and pipelines.

2. Vacuum valve application: The vacuum valve specially used to prevent oil return from the mechanical vacuum pump is installed at the oil inlet of the mechanical vacuum pump and opens and closes synchronously with the pump.

Vacuum valve: refers to a valve whose working pressure is lower than the standard atmospheric pressure.

Several common connection forms for vacuum valves.

1. Flange connection.

This is the most widely used form of connection in valves. According to the shape of the joint surface, it can be divided into the following types:

1) Smooth type: used for valves with low pressure. It is more convenient to process.

2) Concave and convex type: the working pressure is high, and the medium hard washer can be used.

3) Tongue and groove type: gasket with large plastic deformation can be used, which is widely used in corrosive media and has a good sealing effect.

4) Trapezoidal trough type: use an oval metal ring as a washer, which is used for valves with a working pressure of 64 kg square centimeters, or high-temperature valves.

5) Lens type: The gasket is a lens shape and is made of metal. For high-pressure valves with a working pressure of 100 kg cm², or high-temperature valves.

6) O-ring type: This is a relatively new form of flange connection, which was developed with the emergence of various rubber O-rings, and it is more reliable than the general flat gasket in terms of sealing effect.

2. Threaded connection.

This is an easy connection method and is often used for small valves. There are two more cases:

1) Direct sealing: the internal and external threads directly play a sealing role. In order to ensure that the connection does not leak, it is often filled with lead oil, thread hemp and PTFE raw tape; Among them, PTFE raw material belt is widely used; This material has good corrosion resistance, excellent sealing effect, easy to use and preserve, and when disassembled, it can be removed intact, because it is a non-sticky film, which is much superior to lead oil and thread hemp.

2) Indirect sealing: The force of thread tightening is transmitted to the gasket between the two planes, so that the gasket acts as a sealing safety valve.

A vacuum valve is a valve whose working pressure is lower than the standard atmospheric pressure. The safety valve is a special valve that is normally closed under the action of external force of the opening and closing parts, and when the medium pressure in the equipment or pipeline rises to exceed the specified value, the medium in the pipeline or equipment is discharged to the outside of the system to prevent the medium pressure from exceeding the specified value. Safety valves belong to the automatic valve category, which are mainly used in boilers, pressure vessels and pipelines, and the control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation.

Note: Safety valves must be pressure-tested before they can be used.

Vacuum valves are a classification of safety valves.

The purpose and characteristics of the two valves are different. The characteristic of vacuum valves is generally to isolate the vacuum environment and the atmospheric environment, so the valve should be able to withstand a large pressure difference. There are needle valves, angle valves, plug plate valves.

Valves used in high vacuum environments generally require particularly good sealing of the valves. The medium should only be used in a gaseous atmosphere.

Safety valves are generally valves that automatically turn on or off when the power is off or the equipment fails. The medium of the partition can be gas or liquid.