How to choose the self operated control valve? Looking for guidance?

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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.

The self-operated control valve is used to regulate the process parameters such as medium flow, pressure, temperature, and liquid level in the field of industrial automation process control. According to the control signal in the automation system, the opening of the valve is automatically adjusted, so as to realize the adjustment of medium flow, pressure, temperature and liquid level.

The flow area between the spool and seat is reduced, and the flow resistance is increased, so that P2 is reduced to the set value. In the same way, when the post-valve pressure P2 is reduced, the direction of action is opposite to the above, which is the working principle of the self-operated (post-valve) pressure regulating valve. This type of valve should generally be installed horizontally in the pipeline.

When it is necessary to change the set value of the pressure p2 behind the valve, the adjusting nut can be adjusted.

Post-valve pressure control:

After the valve pressure P1 of the working medium passes through the throttle behind the valve core and the valve seat, it becomes the pressure behind the valve and is input into the lower membrane chamber of the actuator through the control pipeline and acts on the top plate, and the resulting force is balanced with the reaction force of the spring, which determines the relative position of the valve core and the valve seat, and controls the pressure behind the valve.

When the pressure p2 increases behind the valve, the force exerted by p2 on the top plate also increases. At this point, the force acting on the top plate is greater than the reaction force of the spring, so that the spool closes to the position of the valve seat until the force acting on the top plate is balanced with the reaction force of the spring.

Automatic adjustment, such as adjusting the outlet pressure to 2 kg, after installing the valve, adjust the nut on the spring until the outlet pressure stabilizes to 2 kg, and the rest If the pressure fluctuates, the flow fluctuation will automatically adjust to 2 kg.

For example, if you want to control the pressure of the oil pipe at 5 kg, then there is an impulse pipe on the top of the self-operated valve that is connected to the pipeline, if the pressure behind the valve is higher than 5 kg, the pressure in the impulse pipe will press the valve down to close the valve small, if the pressure behind the valve is lower than 5 kg, then the pressure of the impulse pipe is lower than 5 kg, then the spring will open the valve up. The force of the spring is adjusted to 5 kg. The spring is that if you are weak, it will be strong, and if you are strong, it will be weak.

Summary. 1. The self-operated pressure regulating valve itself can only adjust the pressure, although the flow rate can be changed by changing the pressure parameters under certain conditions, but this is the result of the influence of the equipment flow, rather than the function of the self-operated pressure regulating valve. The self-acting pressure regulating valve itself does not have a flow regulation function.

2. The self-operated pressure regulating valve is divided into two types of adjustment: before and after the valve, which can only adjust the pressure before or behind the valve, that is, no matter how the pressure fluctuates before the valve, the pressure before the valve can be adjusted to remain stable; The same post-valve type only manages the valve behind the valve and does not care about the valve front.

How to adjust the pressure of the self-operated pressure regulating valve.

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1. The self-operated pressure regulating valve itself can only adjust the pressure, although the flow rate can be changed by changing the pressure parameters under certain conditions, but this is the result of the influence of the equipment flow, rather than the function of the self-operated pressure regulating valve. The self-acting pressure regulating valve mold does not have a flow regulation function. 2. The self-operated pressure regulating valve is divided into two types of adjustment: before and after the valve, which can only adjust the pressure before or behind the valve, that is, the pressure before the valve can be adjusted regardless of how the pressure behind the valve fluctuates, and the pressure before the valve is adjusted to remain stable; The same valve after the Dan brother type only after the valve does not care about the front of the valve.

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Dear users, self-operated pressure regulating valves and proportional valves are both pressure control valves, but their working principles and application scenarios are different. Self-operated pressure regulating valve is a mechanical pressure control valve, which controls the pressure of the medium by adjusting the tension of the spring to keep it within a set range. Self-operated pressure regulators are commonly used for fluid control in the low pressure range, such as water supply systems, air conditioning systems, etc.

The proportional valve is an electronic pressure control valve, which controls the opening of the valve through electronic signals, so as to achieve accurate control of the flow of the medium. Proportional valves are typically used for high-precision, high-pressure fluid control, such as hydraulics, pneumatics, etc. In general, self-operated pressure regulators are suitable for fluid control in the low precision and low pressure range, while proportional valves are suitable for fluid control in the high precision and high pressure range.

Hello, self-acting pressure regulating valves and proportional valves are both valves used to control fluid pressure, but their working principles and application scenarios are different. A self-actuated pressure regulator is a mechanical valve that controls the pressure of a fluid by adjusting the spring force and the position of the spool. When the fluid pressure exceeds the set value, the spool will automatically close, preventing the fluid from continuing to enter the system, so as to achieve the purpose of adjusting the pressure.

The self-operated blind pressure regulating valve is suitable for occasions with low requirements for pressure changes, such as water supply systems, air conditioning systems, etc. A proportional valve is an electro-hydraulic control valve that regulates the pressure of the fluid by controlling the position of the spool by means of an electromagnet. The proportional valve can accurately adjust the fluid pressure according to the size of the input signal, and is suitable for applications with high requirements for pressure changes, such as machine tool hydraulics, aerospace, etc.

In short, self-operated pressure regulating valves and proportional valves have their own advantages and disadvantages and applicable occasions, and it is necessary to select the appropriate valve according to the specific work requirements.

Summary. 1.The self-operated pressure regulating valve is a portal valve that regulates the fluid from the high pressure area to the low pressure area or from the low pressure area to the high pressure area, it can automatically adjust the flow rate according to the change of pressure, but its flow rate does not change within the set range.

2.Proportional valves, on the other hand, can regulate the flow rate based on the input signal, usually in both one and both directions. It enables more precise flow regulation, and it can adjust the flow rate in real time within a set range.

3.In addition, the self-acting pressure regulator has a very precise pressure regulation capability and can be adapted to a wide range of flow requirements. Proportional valves, on the other hand, are able to meet the requirements of more precise flow regulation.

Self-operated pressure regulators and proportional valves are common flow and body control valves, and they are widely used to control flow sheds, pressure, and temperature. Find out the following areas for you.

1.Self-operated pressure regulating valve is a kind of gate valve, which can adjust the fluid from the high pressure area to the low pressure area or from the low pressure area to the high pressure area, it can automatically adjust the flow according to the change of pressure, but its flow rate will not change in the set range. 2.

Proportional valves, on the other hand, can regulate the flow rate based on the input signal, usually in both one and both directions. It enables more precise flow regulation, and it can adjust the flow rate in real time within a set range. 3.

In addition, the self-acting pressure regulating valve has the ability to regulate the pressure accurately without loose and can be well adapted to a variety of different flow requirements. Proportional valves, on the other hand, are able to meet the requirements of more precise flow regulation.

Self-operated pressure regulating valve installation instructions.

The self-operated pressure regulating valve does not need other external energy such as power supply and air source, and only relies on the medium's own energy to drive, which is energy-saving and environmentally friendly, easy to use, and can be put into automatic operation after the installation is completed.

Self-operated pressure regulating valve, whether it is properly installed, has a vital role in the future service life, and even if it is not installed properly, it will also cause damage to the self-operated pressure regulating valve. The detailed installation steps of VTON self-operated control valve are for reference.

1. It is very important and necessary to read the product manual of VTON self-operated control valve, check whether the product meets your own requirements, and if all parameters are consistent with what you want, you can prepare for installation.

2. Before taking over, it is necessary to clean the pipeline under a certain pressure, generally around the right, to ensure that there is no rust slag, metal powder and sealing material residue in the pipeline.

3. If there are impurities in the medium, and the impurities affect the work of the valve, it is necessary to install a filter screen in the pipeline.

4. When taking over the sealing material, it is necessary to pay attention not to use it excessively, as the excessive sealing material may enter the working cavity of the valve, which will affect the normal operation of the self-operated pressure regulating valve.

5. The installation environment of VTON self-operated pressure regulating valve should be as spacious as possible, so as to facilitate later maintenance and replacement.

6. Special precautions for VTON self-operated pressure regulating valve when used for steam:

The self-operated pressure regulating valve valve is used on the steam pipeline, and it has only been put into use for just one or two months, and the user has reported for repair. When I went to the scene, a large amount of steam was discharged from the exhaust hole of the membrane head of the regulating valve, and the noise was extremely loud and amazing. The cause of the accident was obviously that the steam did not condense, and directly entered the membrane head, burning out the diaphragm.

For steam pipeline self-operated pressure regulating valve, a condensing tank must be added between the actuator and the pipeline during installation, and the steam cannot be allowed to enter the actuator membrane head, the regulating valve must be installed head down, and the condensation tank should be higher than the membrane head.

Look at the on-site installation method, ask the on-site instrument personnel, these are all right, so what causes it? It's puzzling. Later, I carefully questioned an operator, and I accidentally found out:

After the valve was installed and put into use, the copper pipe joint between the condensate tank and the membrane head has been leaking intermittently. It turned out that the water leakage caused the water in the condensate tank to slowly leak, and the steam entered the membrane head and burned out the diaphragm.

Self-operated control valve installation method:

1. The general regulations for the installation of self-operated control valves are: before installation, the model and specifications should be carefully checked to see if they meet the design requirements.

2. Check whether the valve stem and valve disc are flexible, and whether there is jamming and skewing. The disc of the self-acting control valve must be closed strictly. The strength and tightness of the valve shall be tested, and the unqualified shall not be installed. When installing, it should be installed according to the design requirements.

3. Installation** is as follows:

ZZYP self-operated pressure regulating valve is composed of valve body, valve seat, valve core, balance spring and other components, which is a kind of valve that does not require external energy and uses the pressure change of the regulated medium itself to automatically adjust, and is an energy-saving product that introduces the controlled medium into the actuator to produce force according to the mechanical principle, and controls the up and down displacement of the valve core elements to achieve automatic adjustment, and the constant pressure or pressure reduction in front of or after the valve. The biggest feature of this product is that it can work in places without electricity and gas, and the pressure setting value can be adjusted at will during operation. It adopts the characteristics of fast opening flow, sensitive action and good sealing performance, and is widely used in the automatic control of gas, liquid, steam and other medium pressure in various industrial equipment such as petroleum, chemical industry, power station, light industry, printing and dyeing.

There are two kinds of actuators for this series of products: film type and piston type; The forms of action are: pressure adjustment before the valve (pressure relief and pressure holding type), pressure adjustment after the valve (pressure reduction and stabilization type); Comes with an insulated condensate tank that can be used at 350 temperatures.

According to different working conditions, different spool structure types and different actuators can be selected to achieve the best control effect.

You can consult Shanghai Kelida Valve Factory, specializing in the production of control valves, with self-operated control valves as the main products.