The valve is in a fluid system, to be used to control the direction of the fluid, pressure, flow apparatus. The valve is to make the pipe and the equipment within the medium (liquid, gas, powder) flow or stop, and can control the flow apparatus.Range Valve
The valve is a control means in the pipeline fluid delivery system, which is used to change the passage cross-section and the direction of medium flow, having a deflector, cutoff, throttled non-return, shunt, or overflow relief function. For fluid control valves, shut-off valve from the most simple to the highly complex automatic control system used in a variety of valves, many varieties and specifications, the valve nominal diameter to pass from tiny instrument valve diameter of 10m, industrial piping with valves. Work pressure valve can be used to control various types of fluid flowing water, steam, oil, gas, mud, and a variety of corrosive media, liquid metal and radioactive fluids, valves 0.0013MPa to 1000MPa ultra high pressure, working temperature -300 ℃ from the ultra-low temperature to a high temperature of 1430 ℃. Control of the valve can be used a variety of transmission, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, dynamic, electromagnetic hydraulic, electric hydraulic, pneumatic and hydraulic, spur gear, bevel gear drive, etc.; pressure, temperature or other forms of sensor signals, according to the predetermined requirements of operation, or does not rely on the sensor signal and simple open or closed, valves rely on the driver or automatic mechanism of the opening and closing member for lifting, sliding, swing or rotary movement, thus changing the size of the area of the flow channel to achieve its control function.hot Water Heater Gas Control Valve
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2013年4月16日星期二
2013年4月15日星期一
A one-way valve introduced
Check valve: check valve, also known as the one-way valve or check valve, and its role is to prevent the media back in the line. Pump water off the bottom valve is a check valve class. Opening and closing pieces by medium flow and force itself on or off, to prevent the media back valve called a check valve. Check valves are automatic valves, main pipeline for way flow of media, and allows the media to flow in one direction only, in order to prevent accidents.
Check valve structure is divided into lift check valve, swing check valve, butterfly valve three. Lift check valve can be divided into vertical and horizontal. Swing check valve is divided into the univalve, double valve type and Orange Peel-three. Butterfly valve straight through the above types of check valves in connection formally can be divided into the threaded connection, flange connection and welding of three. The one-way valve is a stream can only flow in one direction but not the reverse direction of the flow control valve. Works with hydraulic check valve. Compressed air from the inlet to enter, and to overcome the spring force and the frictional force so that the one-way valve port open, check valve is applied to a reverse flow of occasions allowed airflow, such as air compressors to the pneumatic cylinders in the compressor and gas the tank is provided between a one-way valve prevents the tank, the compressed air is returned to the air compressor when the air compressor stops working. Check valve is also often combined with the throttle valve, sequence valve into a one-way throttle valves use it to replace a one-way order.Safety Valve Burner Valve
Closing valves, also called the sectional door, is the most widely used as a valve reason it popular, is the friction between the sealing surface due to the process of opening and closing is small, relatively durable, opening height is small, easy to manufacture, maintenance convenience, applies not only to the low pressure, but also suitable for high pressure. The shut-off valve is closed principle, relying on the valve bar pressure, the sealing surface of the valve seat sealing surface to fit closely to prevent media circulation. Media shut-off valve can only unidirectional flow directional installation. The date of the length of the structure of the valve is greater than the gate, while the fluid flow resistance is large, the long-term operation, the sealing reliability is not strong.Valve Burner
Check valve structure is divided into lift check valve, swing check valve, butterfly valve three. Lift check valve can be divided into vertical and horizontal. Swing check valve is divided into the univalve, double valve type and Orange Peel-three. Butterfly valve straight through the above types of check valves in connection formally can be divided into the threaded connection, flange connection and welding of three. The one-way valve is a stream can only flow in one direction but not the reverse direction of the flow control valve. Works with hydraulic check valve. Compressed air from the inlet to enter, and to overcome the spring force and the frictional force so that the one-way valve port open, check valve is applied to a reverse flow of occasions allowed airflow, such as air compressors to the pneumatic cylinders in the compressor and gas the tank is provided between a one-way valve prevents the tank, the compressed air is returned to the air compressor when the air compressor stops working. Check valve is also often combined with the throttle valve, sequence valve into a one-way throttle valves use it to replace a one-way order.Safety Valve Burner Valve
Closing valves, also called the sectional door, is the most widely used as a valve reason it popular, is the friction between the sealing surface due to the process of opening and closing is small, relatively durable, opening height is small, easy to manufacture, maintenance convenience, applies not only to the low pressure, but also suitable for high pressure. The shut-off valve is closed principle, relying on the valve bar pressure, the sealing surface of the valve seat sealing surface to fit closely to prevent media circulation. Media shut-off valve can only unidirectional flow directional installation. The date of the length of the structure of the valve is greater than the gate, while the fluid flow resistance is large, the long-term operation, the sealing reliability is not strong.Valve Burner
2013年4月14日星期日
Valve installation and maintenance can not be underestimated
Valve installation and maintenance should note the following: handwheel, handle and drive mechanism does not allow for lifting use, and non-collision. Gate Valve should be mounted vertically (ie the stem in a vertical position, the hand wheel at the top). Gate valve with bypass valve in the open before you open the bypass valve (opening force to balance imports and exports and reduce the pressure). With the drive mechanism of the valve, according to product instructions required to install. If the valve is turned on and off frequently use monthly lubrication at least once. Valve is used as a cut-off media, direct in the fully open the entire circulation of the media running minimal pressure loss. Valve usually do not need to open and close frequently, and keep the gate fully open or fully closed condition. Does not apply to a regulator or throttling. In the local conditions can cause vibration of the gate for the high-speed flow of medium, ram, vibration may damage the gate and seat sealing surface the throttle damper will suffer erosion of media. From the structural form, the main difference is that the sealing element in the form of. Sealing element in the form of the gate valve is often divided into several different types: wedge gate valves, parallel gate valve, parallel Gate Valve, Wedge double plate gate, etc.. The most commonly used form of wedge gate valve and parallel gate valve.Gas Oven Valve
The role of this type of valve is only allow the medium to flow in one direction, and stop the flow direction. Usually the valve is automatically work in a direction of flow of fluid under pressure, the valve opens; fluid flow in opposite directions, from the coincidence of the valve role of fluid pressure and the valve on the valve seat, thereby cutting off the flow. Check them belonging to this type of valve, which includes a swing check valve and lift check valves. Swing Check Valve ordinary hinge, like there is a door flap valve against the seat tilt surface. In order to ensure that the valve every time to reach the appropriate location of the seat surface, the valve design in the hinge mechanism, so that the valve has sufficient swing space, and a real flap valve, full contact with the valve seat. All valve can be made of metal, leather, rubber, can also be embedded in the metal or synthetic cover, depending on the use of performance requirements. Swing check valve in the fully open position, virtually unimpeded fluid pressure is relatively small, so the pressure drop through the valve. Lift check valve valve seat sealing surface located in the body. This valve, in addition to the valve is free to lift, like the rest of the shut-off valve as the fluid pressure valve seat sealing surface lift the medium return valve seat valve down and cut off the flow.Stove Valve
The role of this type of valve is only allow the medium to flow in one direction, and stop the flow direction. Usually the valve is automatically work in a direction of flow of fluid under pressure, the valve opens; fluid flow in opposite directions, from the coincidence of the valve role of fluid pressure and the valve on the valve seat, thereby cutting off the flow. Check them belonging to this type of valve, which includes a swing check valve and lift check valves. Swing Check Valve ordinary hinge, like there is a door flap valve against the seat tilt surface. In order to ensure that the valve every time to reach the appropriate location of the seat surface, the valve design in the hinge mechanism, so that the valve has sufficient swing space, and a real flap valve, full contact with the valve seat. All valve can be made of metal, leather, rubber, can also be embedded in the metal or synthetic cover, depending on the use of performance requirements. Swing check valve in the fully open position, virtually unimpeded fluid pressure is relatively small, so the pressure drop through the valve. Lift check valve valve seat sealing surface located in the body. This valve, in addition to the valve is free to lift, like the rest of the shut-off valve as the fluid pressure valve seat sealing surface lift the medium return valve seat valve down and cut off the flow.Stove Valve
2013年4月12日星期五
Balancing valve in the heating water system
Heating and hot water system was going through the necessary hydraulic balance, but if the lack of quantitative regulation still appear hydraulic imbalance, leading to overheating of the room temperature Enthusiasm proximal end too cold, the phenomenon is quite common in the district heating network.
The circulating pump is most unfavorable loop configuration, the rest of the loop pressure drop is relatively small, called "enabling loop. As each loop pressure drop, the runtime system will automatically assign the flow parallel loop voltage drop, resulting in the most unfavorable loop outside the loop overcurrent water system is run in the large flow of small temperature difference. As achieve the static hydraulic balance of each loop, the range of the economy than the friction maximize favorable loop flow rate and pressure drop with the most unfavorable loop pressure drop difference is reduced outdoor pipe network in order to achieve balance. Loop voltage drop when the difference exceeds 15%, the regulations should set the hydraulic balancing device. In recent years, hydraulic balancing valve as hydraulic balancing device is widely used. Hydraulic balancing valve is divided into static and dynamic two.Heater Gas Valve
(1) static balance valve with manual control valve opening degree readings cursor locking device and flow characteristics known, with the function of shut-off valves. Installation of such valves can no longer set the shut-off valve. When the initial adjustment of the system, according to the design of the controlled object to the desired flow, pressure drop, more precisely by manually the spool adjustment to the desired degree of opening and can be locked, so that the voltage drop across the parallel loop to adjust to the most adverse loop voltage drop value so that the water flows parallel loop device assigned to design rated.
Project, due to the theoretical calculation of the value of the heating water system design is often associated with the actual error, different equipment pressure drop values of the pressure drop and design of the on-site installation of equipment, and the installation often according to the site of the pipeline appropriate modifications. Regulating valve according to the design flow pressure drop, its accuracy deviation, which requires a lot of tedious repeated debugging in order to make the system tends coupling of hydraulic balance in engineering practice, which is more difficult. Set static balancing valve and set the traditional flow characteristics of a good cut-off valve, throttle compared to a clear advantage in the debugging process.
(2) dynamic balancing valve. Can be divided into self-Flow Control Valves and self-pressure balancing valve. Operated flow balancing valve is a self-regulating device over the flow area changes with the change of valve pressure at both ends. Valve pressure at both ends of its range of operating pressure differential spool opening degree will change with the role in the differential pressure across the valve and change the flow of the valve is always the same. If the pressure is less than the minimum working pressure or greater than the maximum operating pressure, the valve dynamic components not action. The valve is equivalent to a restriction orifice flow and increase or decrease with changes in the pressure at both ends. Operated flow balancing valves can be used in the constant flow loop, riser, horizontal piping systems and equipment should not be located in the variable flow of the pipeline.
Self-pressure balancing valve should be set in the variable flow system. Able to rely on external or charged object flow change the valve spring force to change the spool position to independently regulate the controlled object for the return water pressure constant. Differential pressure setting can be changed by adjusting the valve spring preload. Pressure balancing valve in variable flow systems are often located in between the buildings of district heating supply and return pipes, manifolds between.Gas Valve
Although the self-pressure balancing valve with electric control valve is an ideal balance of measures to be adjusted with the set of end equipment load, but the current price is still too high pressure balancing valve, so set what hydraulic balancing device and what regulation The program should be based on project investment and fluctuations in room temperature to allow the requirements of a reasonable choice, which not only satisfy the comfort requirements of both energy efficiency and economic rationality.
Reasonable, as long as the design of the water system automatically adjusts the device is properly configured and after careful debugging Practice has proved that the operation of the heating system can meet the design requirements.
The circulating pump is most unfavorable loop configuration, the rest of the loop pressure drop is relatively small, called "enabling loop. As each loop pressure drop, the runtime system will automatically assign the flow parallel loop voltage drop, resulting in the most unfavorable loop outside the loop overcurrent water system is run in the large flow of small temperature difference. As achieve the static hydraulic balance of each loop, the range of the economy than the friction maximize favorable loop flow rate and pressure drop with the most unfavorable loop pressure drop difference is reduced outdoor pipe network in order to achieve balance. Loop voltage drop when the difference exceeds 15%, the regulations should set the hydraulic balancing device. In recent years, hydraulic balancing valve as hydraulic balancing device is widely used. Hydraulic balancing valve is divided into static and dynamic two.Heater Gas Valve
(1) static balance valve with manual control valve opening degree readings cursor locking device and flow characteristics known, with the function of shut-off valves. Installation of such valves can no longer set the shut-off valve. When the initial adjustment of the system, according to the design of the controlled object to the desired flow, pressure drop, more precisely by manually the spool adjustment to the desired degree of opening and can be locked, so that the voltage drop across the parallel loop to adjust to the most adverse loop voltage drop value so that the water flows parallel loop device assigned to design rated.
Project, due to the theoretical calculation of the value of the heating water system design is often associated with the actual error, different equipment pressure drop values of the pressure drop and design of the on-site installation of equipment, and the installation often according to the site of the pipeline appropriate modifications. Regulating valve according to the design flow pressure drop, its accuracy deviation, which requires a lot of tedious repeated debugging in order to make the system tends coupling of hydraulic balance in engineering practice, which is more difficult. Set static balancing valve and set the traditional flow characteristics of a good cut-off valve, throttle compared to a clear advantage in the debugging process.
(2) dynamic balancing valve. Can be divided into self-Flow Control Valves and self-pressure balancing valve. Operated flow balancing valve is a self-regulating device over the flow area changes with the change of valve pressure at both ends. Valve pressure at both ends of its range of operating pressure differential spool opening degree will change with the role in the differential pressure across the valve and change the flow of the valve is always the same. If the pressure is less than the minimum working pressure or greater than the maximum operating pressure, the valve dynamic components not action. The valve is equivalent to a restriction orifice flow and increase or decrease with changes in the pressure at both ends. Operated flow balancing valves can be used in the constant flow loop, riser, horizontal piping systems and equipment should not be located in the variable flow of the pipeline.
Self-pressure balancing valve should be set in the variable flow system. Able to rely on external or charged object flow change the valve spring force to change the spool position to independently regulate the controlled object for the return water pressure constant. Differential pressure setting can be changed by adjusting the valve spring preload. Pressure balancing valve in variable flow systems are often located in between the buildings of district heating supply and return pipes, manifolds between.Gas Valve
Although the self-pressure balancing valve with electric control valve is an ideal balance of measures to be adjusted with the set of end equipment load, but the current price is still too high pressure balancing valve, so set what hydraulic balancing device and what regulation The program should be based on project investment and fluctuations in room temperature to allow the requirements of a reasonable choice, which not only satisfy the comfort requirements of both energy efficiency and economic rationality.
Reasonable, as long as the design of the water system automatically adjusts the device is properly configured and after careful debugging Practice has proved that the operation of the heating system can meet the design requirements.
2013年4月10日星期三
The pneumatic ball of principle Detailed
Pneumatic ball plug valves evolved. It has the same 90 degrees rotation action, the difference is that the cock body is a sphere, a circular through-hole or channel through its axis. Sphere and the ratio of openings should be so, that when the ball is rotated 90 degrees in the import and export of office should all rendered sphere, thereby cutting off the flow. The valve can be installed anywhere in the pipeline.Gas Heater Control Valve
Pneumatic ball valves just use the pneumatic actuator driven valve body for 90 degrees of rotation, can realize the function of truncated and opened for media traffic. And only need a small torque can be closed tightly. Complete equality of the body cavity of the media to provide a little resistance, and the straight-through flow channel. Usually considered the most suitable valve opening and closing done directly, but recent developments have sent the ball valve is designed so that it has a throttle and control the flow purposes. The main features of valve is its own compact, easy operation and maintenance, suitable for general working medium of water, solvents, acids, and natural gas, but also for the poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve can be a whole, it can be modular.magnet valve
2013年4月8日星期一
The introduction of the valve electric device
Type of structure
Denso type of structure can be divided into one and split two. Denso integrated the control the Denso run the control devices installed inside Denso Denso as a whole. Integrated Denso is divided into ordinary and intelligent. Domestic electric device manufacturers can manufacture. Split Denso is the control the Denso run the control devices installed in the separate control cabinet.Gas Burner Valves
Work
Denso's work is divided into the switch type and adjust the type. Switch type mainly refers to the the Denso motor number of starts is generally <600 beats / min. Switching Denso only apply to one-off valve on or off. Modulating mainly refers to the The Denso exchange to more frequent, the number of motor starters typically 1200 times / min. The adjustment type Denso to accept the 4 ~ 20mA analog signal 4 ~ 20mA analog signal and the feedback of valve position, to meet the need for closed-loop control.
Rotary ways
Denso rotary divided into transition and part of the transition. Transition Denso want to rotate the Multiturn to open or close the valve. Denso valve of this type have two transmission mechanism between. Part of the transition to rotated 90 ° Denso will be able to open or close the valve. Such Denso valve directly connected.Water Heater Gas Valve
Work environment
The work environment is divided into flameproof electrical equipment and common type. The flameproof means Denso with explosion-proof function in an explosive atmosphere. Common type is the environment outside the flammable and explosive environment.
Denso type of structure can be divided into one and split two. Denso integrated the control the Denso run the control devices installed inside Denso Denso as a whole. Integrated Denso is divided into ordinary and intelligent. Domestic electric device manufacturers can manufacture. Split Denso is the control the Denso run the control devices installed in the separate control cabinet.Gas Burner Valves
Work
Denso's work is divided into the switch type and adjust the type. Switch type mainly refers to the the Denso motor number of starts is generally <600 beats / min. Switching Denso only apply to one-off valve on or off. Modulating mainly refers to the The Denso exchange to more frequent, the number of motor starters typically 1200 times / min. The adjustment type Denso to accept the 4 ~ 20mA analog signal 4 ~ 20mA analog signal and the feedback of valve position, to meet the need for closed-loop control.
Rotary ways
Denso rotary divided into transition and part of the transition. Transition Denso want to rotate the Multiturn to open or close the valve. Denso valve of this type have two transmission mechanism between. Part of the transition to rotated 90 ° Denso will be able to open or close the valve. Such Denso valve directly connected.Water Heater Gas Valve
Work environment
The work environment is divided into flameproof electrical equipment and common type. The flameproof means Denso with explosion-proof function in an explosive atmosphere. Common type is the environment outside the flammable and explosive environment.
2013年4月7日星期日
What is your opinion about the classification of the gas valve
Gas Valve widely used, a wide range of classification more. The total can be divided into two categories:
The first automatic valve: to rely on the ability of the gas itself and the action of the valve. Check valve, control valve, pressure reducing valve.
Second class driver valve: valve with manual, electric, pneumatic maneuvers. Such as gate valves, globe valves, throttle valves, butterfly valves, ball valves, plug valves.
In addition, the classification of the valve the following ways:
Characteristics of the structure, the direction of movement relative to the valve seat can be divided according to the closure of parts:
1 cut-off door-shaped: the closure member is moved along the seat center.
2 gate-shaped: the closure member to move along the vertical seat center.
3 cocks and ball: shut down parts of the plunger or ball rotation around itself centerline.
Swing shape: Close-axis rotation of pieces around the outside of the seat.
5 coned disc: Close the disc member, rotating around the axis of the valve seat.
6 slide valve shape: off pieces sliding perpendicular to the direction of the channel.gas valve China Manufacturer
By structural Category:
Plug valves, gate valve, globe valve, ball - used to turn on or off the flow of gas pipeline. Check valve (bottom valve) - used to automatically prevent backflow of gas pipe.
The first automatic valve: to rely on the ability of the gas itself and the action of the valve. Check valve, control valve, pressure reducing valve.
Second class driver valve: valve with manual, electric, pneumatic maneuvers. Such as gate valves, globe valves, throttle valves, butterfly valves, ball valves, plug valves.
In addition, the classification of the valve the following ways:
Characteristics of the structure, the direction of movement relative to the valve seat can be divided according to the closure of parts:
1 cut-off door-shaped: the closure member is moved along the seat center.
2 gate-shaped: the closure member to move along the vertical seat center.
3 cocks and ball: shut down parts of the plunger or ball rotation around itself centerline.
Swing shape: Close-axis rotation of pieces around the outside of the seat.
5 coned disc: Close the disc member, rotating around the axis of the valve seat.
6 slide valve shape: off pieces sliding perpendicular to the direction of the channel.gas valve China Manufacturer
By structural Category:
Plug valves, gate valve, globe valve, ball - used to turn on or off the flow of gas pipeline. Check valve (bottom valve) - used to automatically prevent backflow of gas pipe.
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