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Differential pressure control valve working principle：

The differential pressure control valve does not need any external energy. It can automatically adjust by relying on the pressure change of the regulated medium itself, automatically eliminate the flow change caused by the residual pressure head and pressure fluctuation of the pipe network, and keep the pressure difference between the user's inlet and outlet constant. It is especially suitable for household metering or automatic control system, which is conducive to stable system operation.

The differential pressure control valve is of double disc structure, with small unbalanced force and compact structure. It is used in the heating (air conditioning) water system to keep the differential pressure of the controlled system constant. According to the differential pressure control valve working principle, users who install the differential pressure control valve do not install the automatic control device. Under the minimum working pressure difference, when the selected pipe diameter is too large and the resistance is reduced, the flow will be too large, which will inevitably cause the hydraulic imbalance of the external network and increase the energy consumption.

The differential pressure control valve is composed of valve body, valve cover, valve core spring, control conduit and pressure regulator.

The valve is installed on the return pipe of the heating pipeline, and the working chamber on the valve is connected with the water supply pipe through the control pipe. Eliminate the flow deviation caused by the pressure fluctuation of the external network. When the water supply pressure P1 increases, the water supply pressure difference P1-P3 increases. The pressure sensing membrane drives the valve core down to close the small valve port, so that P2 increases, thus maintaining the constant P1-P2. When the water supply pressure P1 decreases, the pressure sensing membrane drives the valve core to move up and P2 decreases, so that P1-P2 is constant. No matter how the pressure changes in the pipeline, the dynamic differential pressure balance valve can maintain the constant pressure and flow applied to the controlled object.

Self-operated Differential Pressure Control Valve Working Principle：

After the process medium is throttled by the valve, it enters the controlled equipment, and the differential pressure of the controlled equipment is respectively introduced into the upper and lower membrane chambers of the valve, generating thrust in the upper and lower membrane chambers, and balancing with the spring reaction force, so as to determine the relative position of the valve core and the valve seat, while the relative position of the valve core and the valve seat determines the size of the differential pressure value. When the controlled differential pressure changes, the balance of the force is destroyed, which drives the movement of the valve core, and the movement of the valve core changes the resistance coefficient of the valve, that is, the controlled differential pressure value is controlled as the set value. This is the working principle of the differential pressure control valve. When the differential pressure setting value needs to be changed, the adjusting nut can be adjusted.

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Classification of Control Valves

Balanced trim control valves are usually divided into static balance valves, dynamic flow balance valves and dynamic differential pressure balance valves.

A. Static balancing valves are also called manual balancing valves, digital locking balancing valves, and butterfly balancing valves and so on. They change the opening of the valve core and seat to change the flow resistance of the valve in order to achieve the purpose of regulating the flow. Their function is to balance the flow of water according to the designed proportion, increase and decrease the branches at the same time in proportion, and still meet the current climate needs of part of the load flow. Quantity demand plays a role of heat balance.

B. Dynamic flow balance valve is also called self-operated flow control valve, self-operated balance valve, constant flow valve, automatic balance valve, etc. The self-operated flow control valve automatically changes the resistance coefficient according to the change of system working condition. Within a certain range of pressure difference, it can effectively control the flow through and maintain a constant value. That is, when the pressure difference between the front and the back of the valve increases, that the flow through the action of small automatic closure of the valve can keep the flow constant. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow remains constant. However, when the pressure difference is smaller or larger than the normal working range of the valve, it can not provide additional pressure head after all. At this time, the flow of the valve to the full open or closed position is still lower or higher than the set flow.

C. Dynamic differential pressure balancing valve, also known as self-operated differential pressure control valve, differential pressure controller, voltage regulator synchronizer, differential pressure balancing valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. Its principle is within a certain flow rate range, and it can be effective. Controlling the pressure difference of the controlled system is constant, that is, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases through the automatic closing action of the valve. On the contrary, when the pressure difference decreases, the valve opens automatically and the pressure difference remains constant.

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The automatic flow valve is a kind of valve that controls the flow rate of the throttle by changing the hydraulic resistance of the throttle under a certain pressure difference so as to regulate the movement speed of the actuator (hydraulic cylinder or hydraulic motor). It mainly includes throttle valve, speed regulating valve, overflow throttle valve and diversion collector valve. Installation form is horizontal installation.

Product features of automatic flow regulating valve:

Automatic flow control valve is a kind of multi-function valve which adopts high precision pilot mode to control flow. It is suitable for pipes with flow and pressure to be controlled in distribution pipes, keeping the predetermined flow unchanged, limiting the excessive flow to a predetermined value, and reducing the upstream high pressure appropriately. Even if the upstream pressure of the main valve changes, it will not affect the downstream flow of the main valve.

Flow control valve selection: can be selected according to pipeline diameter. It can be selected according to the maximum flow rate and the flow range of the valve.

The working principle of automatic flow control valve:

The structure of the digital flow control valve is composed of an automatic spool, a manual spool and a display. The display part is composed of flow valve core, sensor transmitter and electronic calculator display.

Its work is extremely complex. The measured water flow passes through the valve, impacts the impeller in the flow core, rotates the impeller and senses the transmitter, so that the sensor sends out a signal proportional to the flow. The flow signal is sent to the electronic calculator through the wire. After calculator calculation and microprocessor treatment, the flow value is displayed.

Manual spool is used to regulate the flow, according to the display value to set the required flow value. Automatic spool is used to maintain constant flow, that is, when the pressure of the pipe network changes, the automatic spool will automatically open a large fire and close a small valve to maintain the set flow value unchanged under the action of pressure.

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Double Regulating Valve Working Principle

Balance valve is a dynamic and static balancing valve under hydraulic conditions. Such as static balance valve, dynamic balance valve.Valve body material: cast iron, cast steel,Work pressure is 0.6-4.0 MPA.The working temperature is - 5 C - 350 C.Valve caliber DN15-DN300,Connection mode: flange, internal thread,Driving mode: manual and electric.Manufacturing standard: national standard.

How do balancing valves work?

Balancing valve is a special balancing valve function. It has good flow characteristics. Besides, it has valve opening index, opening locking device and pressure measuring valve for flow measurement. By using special intelligent instrument, the flow value flowing through the balance valve can be directly displayed by inputting the valve type and opening value according to the measured pressure difference signal. As long as the balance valve with appropriate specifications is installed in each branch and user's entrance and debugged once with the special intelligent instrument, the flow rate of each user can reach the set value.Static balancing valves are also called balancing valves, manual balancing valves, digital locking balancing valves, double-position regulating valves, etc. It is through changing the clearance between the spool and the seat (opening), to change the flow resistance through the valve in order to achieve the purpose of regulating flow. Its object of action is the resistance of the system, which can distribute the new water in proportion to the design calculation, increase and decrease the branches in proportion at the same time, still meet the flow demand of part of the load under the current climate needs, and play the role of heat balance. Dynamic balancing valves are divided into dynamic flow balancing valves, dynamic differential pressure balancing valves, self-operated differential pressure control valves and so on.Dynamic flow balance valve is also called self-operated flow control valve, self balancing valve, constant flow valve, automatic balance valve, etc. It automatically changes the drag coefficient according to the change of system working condition (differential pressure). In a certain range of pressure difference, the flow through can be effectively controlled to maintain a constant value, that is, when the pressure difference before and after the valve increases, the flow through the valve can be maintained by the action of automatic closing small. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow rate remains constant. However, when the pressure difference is smaller or larger than the normal working range of the valve, it can not provide additional pressure head after all. At this time, the flow rate of the valve to the full open or closed position is still lower or higher than the set flow rate can not be controlled.Dynamic differential pressure balancing valve, also known as self-operated differential pressure control valve, differential pressure controller, constant voltage variable synchronizer, differential pressure balancing valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. The valve working principle is that in a certain flow range, it can effectively control the constant pressure difference of the controlled system, that is, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases by automatically closing the valve. When the pressure difference decreases, the valve opens automatically, and the pressure difference remains constant. The self-operated pressure difference control valve has an automatic plug closing state within the control range. The pressure difference between the two ends of the valve exceeds the preset value. The plug opens automatically and adjusts the opening automatically under the action of the pressure sensitive film to keep the pressure difference between the two ends of the valve relatively constant.

ZECO is a professional control valve manufacturers china, we provide gate valve, butterfly valve,control valve,water valve and etc. Want to know more, please contact us.

Balancing Valve Types

1.Static Balance Valve: It is also called Balance Valve, Manual Balance Valve, Digital Lock Balance Valve, Double Position Regulating Valve, etc. It changes the flow resistance through the valve by changing the clearance (opening) between the spool and the seat to achieve the purpose of regulating the flow rate. Its object of action is the resistance of the system, which can distribute the new water in proportion to the design calculation. Each branch increases or decreases in proportion at the same time, and still meets the flow demand of part of the current load.2.Dynamic flow balance valve: It is also called self-operated flow control valve, self-operated balance valve, constant flow valve, automatic balance valve, etc. It automatically changes resistance coefficient according to the change of system working condition (pressure difference). In a certain range of pressure difference, the flow through can be effectively controlled to maintain a constant value, that is, when the pressure difference before and after the valve increases, the flow through the valve can be maintained by the action of automatic closing small. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow rate remains constant.3.Self-operated differential pressure control valve: it is also known as dynamic differential pressure balance valve, differential pressure controller, stabilized variable synchronizer, differential pressure balance valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. Its principle is that it can effectively control the constant pressure difference of the controlled system within a certain flow range. That is to say, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases through the automatic closing of the valve. On the contrary, when the pressure difference decreases, the valve opens automatically and the pressure difference remains constant.

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As one of the primary regulation methods of hot water heating system, the return water temperature regulation method of hot water heating system is suitable for the pipeline network without regulating valves. When the balance valve is not installed at the user's entrance of the pipe network, or when the pressure gauges at both ends of the ordinary control valve are not complete at the entrance, or even when the pipe network entrance only has the ordinary valve, the return water temperature regulation method can be used to adjust.

Chinese Name: Backwater Temperature Regulation Method for Hot Water Heating System Foreign Name: the return water temperature regulation of hot water heating system Purpose: To adjust the operating flow of thermal users to the ideal flow rate.Field: Heating Regulation Characteristic: Suitable for pipeline network without regulating valve Regulation theory

When the heating system runs in a stable state, if the loss along the pipeline network is not considered, the heat supplied by the heat medium to the indoor heat dissipation equipment should be equal to the heat dissipation of the heat dissipation equipment and the heat load of the heating user. The heat supplied by the pipe network to the indoor heat dissipation equipment is equal to the product of its flow rate, the temperature difference between supply and return water and the specific heat of hot water. When the actual flow rate is larger than the design flow rate, the temperature difference between supply and return water decreases and the return water temperature is higher than the specified value. When the actual flow rate is less than the design flow rate, the temperature difference between supply and return water increases, and the temperature of return water is lower than the stable value.

Therefore, as long as the return water temperature of each user is equal (when the water supply temperature is equal) or the temperature difference between the supply and return water is equal (the insulation effect of the pipeline is poor, the water supply temperature is slightly different), the heat users can get the heat corresponding to the heat load and achieve the goal of uniform regulation.This method is the simplest, primitive and time-consuming one. It can be used in any heating system. It does not require the type of valves, pressure gauges and thermometers. It only needs an infrared thermometer or a digital surface thermometer.

(1) Determination of regulating temperatureWhen the heat supply of the heat source is greater than or equal to the user's heat load and the flow rate of the circulating pump is greater than the design flow rate, considering the energy-saving operation of the circulating pump, the user's return water temperature should be adjusted to the return water temperature corresponding to the temperature regulation curve. When the heat supply of heat source is greater than or equal to the user's heat load and the flow of circulating pump is less than the designed flow rate, the average temperature of supply and return water should be adjusted to the average temperature of supply and return water corresponding to the temperature regulation curve. When the heat supply of heat source is less than the user's heat load, the user's return water temperature should be adjusted to a little lower than the total return water temperature.

(2) Regulation processBecause of the large thermal inertia of the heating system, the temperature changes obviously after the belt. After adjusting the flow rate of the system, the temperature of the system can not reflect the change of the flow rate in time, so the adjustment of the valve opening has a certain degree of experience. The measurement temperature should be adjusted by all users after a period of time. The interval time is related to the size of the system. When the total backwater temperature is stable at a certain value, the next round of adjustment can be made.

Firstly, the backwater temperature of each user is recorded and compared with the total backwater temperature. The higher the temperature, the smaller the valve closes. Under the same backwater temperature difference between users, the bigger the pipe diameter, the more closed it is. In the first round of adjustment, the proximal end user valve should close excessively. Record the number of valve closing cycles for each user.

After the first round of adjustment is completed, the user's return water temperature is recorded after the total return water temperature is stable and unchanged, and compared with that before adjustment, and then compared with the total return water temperature for the second round of adjustment. The interval between the first and second rounds should be more than twice the time required for the furthest user to return water to the heat source after the first adjustment. Estimates are made according to the flow rate of the network and the longest user pipe length, and so on.

ZECO is a professional control valve manufacturers in china, we provide gate valve, butterfly valve,hot water temperature regulations wa, control valve,water valve and etc. Want to know more, please contact us.

Balancing valve types

1.Static Balance Valve: It is also called Balance Valve, Manual Balance Valve, Digital Lock Balance Valve, Double Position Regulating Valve, etc. It changes the flow resistance through the valve by changing the clearance (opening) between the spool and the seat to achieve the purpose of regulating the flow rate. Its object of action is the resistance of the system, which can distribute the new water in proportion to the design calculation. Each branch increases or decreases in proportion at the same time, and still meets the flow demand of part of the current load.

2.Dynamic flow balance valve: It is also called self-operated flow control valve, self-operated balance valve, constant flow valve, automatic balance valve, etc. It automatically changes resistance coefficient according to the change of system working condition (pressure difference). In a certain range of pressure difference, the flow through can be effectively controlled to maintain a constant value, that is, when the pressure difference before and after the valve increases, the flow through the valve can be maintained by the action of automatic closing small. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow rate remains constant.

3.Self-operated differential pressure control valve: it is also known as dynamic differential pressure balance valve, differential pressure controller, stabilized variable synchronizer, differential pressure balance valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. Its principle is that it can effectively control the constant pressure difference of the controlled system within a certain flow range. That is to say, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases through the automatic closing of the valve. On the contrary, when the pressure difference decreases, the valve opens automatically and the pressure difference remains constant.

Zheng feng is one of the most professional water gate valve manufacturers in china. And we sincerely invite and welcome people from all around the world to invest and create more values together.

Balance valve is a dynamic and static balancing valve under hydraulic conditions. Such as static balance valve, dynamic balance valve.

Valve body material: cast iron, cast steel,

Work pressure is 0.6-4.0 MPA.

The working temperature is - 5 C - 350 C.

Valve caliber DN15-DN300,

Connection mode: flange, internal thread,

Driving mode: manual and electric.

Manufacturing standard: national standard.

How do balancing valves work?

Balancing valve is a special function valve. It has good flow characteristics. Besides, it has valve opening index, opening locking device and pressure measuring valve for flow measurement. By using special intelligent instrument, the flow value flowing through the balance valve can be directly displayed by inputting the valve type and opening value according to the measured pressure difference signal. As long as the balance valve with appropriate specifications is installed in each branch and user's entrance and debugged once with the special intelligent instrument, the flow rate of each user can reach the set value.

Static balancing valves are also called balancing valves, manual balancing valves, digital locking balancing valves, double-position regulating valves, etc. It is through changing the clearance between the spool and the seat (opening), to change the flow resistance through the valve in order to achieve the purpose of regulating flow. Its object of action is the resistance of the system, which can distribute the new water in proportion to the design calculation, increase and decrease the branches in proportion at the same time, still meet the flow demand of part of the load under the current climate needs, and play the role of heat balance. Dynamic balancing valves are divided into dynamic flow balancing valves, dynamic differential pressure balancing valves, self-operated differential pressure control valves and so on.

Dynamic flow balance valve is also called self-operated flow control valve, self-operated balance valve, constant flow valve, automatic balance valve, etc. It automatically changes the drag coefficient according to the change of system working condition (differential pressure). In a certain range of pressure difference, the flow through can be effectively controlled to maintain a constant value, that is, when the pressure difference before and after the valve increases, the flow through the valve can be maintained by the action of automatic closing small. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow rate remains constant. However, when the pressure difference is smaller or larger than the normal working range of the valve, it can not provide additional pressure head after all. At this time, the flow rate of the valve to the full open or closed position is still lower or higher than the set flow rate can not be controlled.

Dynamic differential pressure balancing valve, also known as self-operated differential pressure control valve China, differential pressure controller, constant voltage variable synchronizer, differential pressure balancing valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. The differential pressure control valve working principle is that in a certain flow range, it can effectively control the constant pressure difference of the controlled system, that is, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases by automatically closing the valve. When the pressure difference decreases, the valve opens automatically, and the pressure difference remains constant. The self-operated pressure difference control valve has an automatic plug closing state within the control range. The pressure difference between the two ends of the valve exceeds the preset value. The plug opens automatically and adjusts the opening automatically under the action of the pressure sensitive film to keep the pressure difference between the two ends of the valve relatively constant.

Zheng feng brand is one of the most professional water gate valve manufacturers in china. And we sincerely invite and welcome people from all around the world to invest and create more values together.

The difference between the two balancing valves is that the thermostatic balancing valve

manually adjusts the opening degree of the thermostat valve, while the auto balancing valve automatically adjusts the opening degree of the thermostat valve by using temperature sensors.

Thermostatic balancing valve (referred to as constant temperature valve) is an energy-saving product. The principle is to control the temperature of the valve by using the temperature sensor in the temperature control valve head. When the room temperature rises, the temperature sensor expands due to thermal expansion and compresses the stem to make the valve close small. When the room temperature drops, the temperature sensor shrinks due to cooling, and the stem springs back to open the valve. Therefore, when the room has other auxiliary heat sources (sunlight, other heaters) and the room temperature is higher than the set temperature, the valve automatically closes down, the water intake of the radiator decreases, ultimately saving the heat of heating.

The setting temperature of the auto balancing valve can be adjusted artificially. The constant temperature valve will automatically control and adjust the water quantity of the radiator according to the set requirements, so as to achieve the purpose of controlling the indoor temperature. Temperature control in user's room is realized by constant temperature control valve of radiator. The constant temperature control valve of radiator is composed of a constant temperature controller, a flow regulating valve and a pair of connectors. The core component of the constant temperature controller is the sensor unit, namely the temperature package. The temperature chamber can induce the volume change caused by the change of ambient temperature, drive the valve core to produce displacement, and then adjust the water quantity of the radiator to change the heat dissipation of the radiator.

Zheng feng is one of the most professional check valve manufacturers china. And we sincerely invite and welcome people from all around the world to invest and create more values together.

The radiator thermostatic balancing valve is a self-operated constant temperature flow control valve mounted on the radiator. It is composed of a thermostatic valve body and a temperature regulating device for air temperature sensing. The principle of action is that the opening of the thermostatic valve body is automatically controlled to change the amount of hot water passing through the radiator. When the room temperature is lower than the set temperature value, the radiator balancing valve automatically opens (or gradually increases) the radiator to heat the room until the room temperature reaches the set value. When the temperature of the room rises, the temperature sensor pack expands, causing the valve to gradually close (or close), and the heat sink will reduce the heating speed (or stop heating). Simply put, the main function is energy saving and comfort. However, many ordinary customers only use ordinary temperature control valves without a temperature pack, which cannot be automatically turned on or off. It is recommended that everyone adjust the indoor temperature and ensure that the indoor temperature is always at the set temperature by adjusting the hot water flow into the radiator. This thing is necessary for today's energy-efficient buildings. Designing houses and public buildings is a form of radiator heating. At this stage, it is necessary to use a three-way connection with a temperature control valve.

Zheng feng brand is one of the most professional group valve manufacturers in china. And we sincerely invite and welcome people from all around the world to invest and create more values together.