Allows you to understand the common valve model selection and application wall mounted electric valve control box structure instructions

Allows you to understand the common valve model selection and application wall mounted electric valve control box structure instructions

The use of gate valve is up to the medium application, in the whole open all commodity circulation, then the medium operation of small pressure loss. Gate valves are generally applicable without often opening and closing, and maintain the working condition of gate valves open or fully closed. Not very suitable for adjusting or throttle applications. The center line of the globe valve seat is vertical with the seat surface. With short seat opening and closing travel arrangements and a reliable break position, these valves are particularly suited for medium break or adjust and throttle applications.
General valve type selection and application
1. The model selection of gate valve is to apply the gate valve to the medium, and the flow of all commodities is direct in the whole opening and falling. At this time, the pressure loss of medium operation is small. Gate valves are generally applicable without often opening and closing, and maintain the working condition of gate valves open or fully closed. Not very suitable for adjusting or throttle applications. For fast-flowing media, gate valves are easy to cause gate vibration when partially opened, and vibration may damage the gate valve and valve seat surface, and the throttle valve will let the gate valve by media abrasion. From the type of construction, the key difference is the way the seals are used. According to the way of sealing parts, gate valves are often divided into several different types, such as: wedge gate valve, parallel gate valve, parallel double gate valve, wedge double gate gate, etc. The common methods are wedge gate valves and parallel gate valves.
Two, the type of the globe valve selection
The center line of the globe valve seat is vertical with the seat surface. With short seat opening and closing travel arrangements and a reliable break position, these valves are particularly suited for medium break or adjust and throttle applications.
Once the piston valve of the globe valve is open, its seat and the piston valve face in the middle is no longer in contact, this type of valve is particularly suitable for disconnection or adjustment of the medium and throttle application.
Once the globe valve is in the open situation, its seat and piston valve face in the middle will not touch, so it is relatively small surface wear, because the vast majority of the globe valve seat and piston valve is easy to repair the replacement of new seals do not need to unload the whole valve from the pipeline, door and pipeline welding into one place is very suitable. Medium according to the fluid orientation of the valve after the change, the force is greater than other valves.
Common stop valves have the following points:
1) angular globe valve; In angular globe valves, the liquid orientation is changed only once so that the gas pressure through the valve is less than that of the basic globe valve.
2) DC electric stop valve; In DC and Y-shaped globe valves, the gate of the oil circuit plate forms a slash with the main flow path. The damage level of this flow condition is lower than that of the basic globe valve, so the pressure loss of the valve is also correspondingly smaller.
3) Plunger pump globe valve: this way of the globe valve is a deformation of the basic globe valve. In this valve, the piston valve and seat are usually customized according to the basic principles of the plunger pump. The piston valve is polished to connect the plunger pump to the seat, and the tightness is achieved through two elastic sealing rings sucked into the plunger pump.
A clasp separates and compacts the seal ring around the plunger pump by increasing the load in the single flow valve through the single flow valve nuts.
With a wide variety of materials, the valve is mainly used to “open” or “close”, but equipped with a specially made plunger pump or special buckle, can also be used to adjust the valve.
Three, the type of gate valve selection and application
Gate valves are developed through plug valves. It has the same rotation 90 degree lift position, except that the cock body is a round ball and has annular buried-hole or safety channel using its center line. The ratio of surface and safety channel is such that the ball rotates 90℃, in the inlet and outlet should all show the surface, and then disconnect the flow.
Gate valve only needs to rotate more than 90 degrees to control the minimal torque to turn off the tight. The completely fair inner wall of the oil circuit plate brings little friction resistance to the medium and direct passage. Gate valves are generally considered suitable for direct opening and closing applications, but recent trends have designed gate valves for throttle and total flow control. The main feature of the gate valve is that its structure is simple, easy to operate and maintain, water, organic solvents, so that the valve and the cut-off valve flow resistance 2 elastic sealing ring with acid and natural gas and other general work and has a very reliable break off elastic sealing ring can be replaced.
The control box is basically suitable for computer PLC control, external input 24V or passive signal, if there are requirements can be improved into an adjustable control box to support DCS automatic control system control, can also be purely plus 4-20mA data signal feedback. Adjustable power supply is selected for control loop, reliable operation, accurate marking of opening degree and reliable use. The shell adopts standardized instrument panel main case, small size and light weight, which is conducive to installation on the control cabinet. Valve electrical control cabinet Performance parameters 1.1 Switching power supply: 380V, 50Hz, three-phase four-wire 1.2 Operating temperature: -20 ~ 40℃1.
Structure description of wall mounted electric valve control box
Basically for mechanical equipment opening degree table, if there are provisions can make data screen.
The control box is basically suitable for computer PLC control, external input 24V or passive signal, if there are requirements can be improved into an adjustable control box to support DCS automatic control system control, can also be purely plus 4-20mA data signal feedback.
Note: Due to the simple structure of the parts cabinet control box, the above function can not be added for lack of space.
Structural characteristics of wall mounted electric valve control box
1. Adjustable power supply is selected for control loop, reliable operation, accurate marking of opening degree and reliable use.
2. The shell adopts standardized instrument panel main case, small size and light weight, which is conducive to installation on the control cabinet.
3 electric valve torque when the voice control switch report, conducive to immediate fault detection.
Main parameters of wall mounted electric valve control box:
1. Valve electrical control cabinet Performance parameters 1.1 Switching power supply: 380V, 50Hz, three-phase four-wire 1.2 Operating temperature: -20 ~ 40℃1.
3 Air humidity: 20±5℃ when not more than 80%
2. Electrical drawings of valve electrical control cabinet
3. Electrical component table of valve electrical control cabinet
4. Valve electrical control cabinet terminal wiring diagram
Note: Please give me the terminal number matching the enterprise electric device in the dotted box
5. Size drawing of valve electrical control cabinet