Important differences between electric valves and solenoid valves – Standard for efficient sealing of medium-temperature oil char pumps and electric valves

Important differences between electric valves and solenoid valves – Standard for efficient sealing of medium-temperature oil char pumps and electric valves

Electric valve and solenoid valve is an important control component in industrial pipeline control, in various industries will have applications, the core differences are mainly the following: first, principle 1, solenoid valve: solenoid valve is through the magnet coil (solenoid valve) and the valve core and valve body, when the magnet coil plugged in or broken
Electric valve and solenoid valve are important control components in industrial pipeline control, in various industries will have applications, the core differences are mainly the following:
I. Principle
1, solenoid valve: solenoid valve is composed of magnet coil (solenoid valve) and valve core and valve body, when the magnet coil is plugged in or power off, push the valve core position, so that the liquid is disconnected according to the valve body or;
2, electric valve: electric valve is driven by the motor driver seat, the valve position, to achieve fluid according to or disconnect;
Two, valve type:
1. Solenoid valve:
1) Two-way solenoid valve: the valve body has a channel an inlet and outlet and pipeline connection, there are two main control methods normally open type (plug solenoid valve off, liquid is disconnected), normally open normally closed type (plug solenoid valve open, liquid according to the gate valve);
2) Three-way solenoid valve: three ports of the valve body are connected with the pipeline, and there are two holes, suitable for three control methods: Normally open and normally closed type (when the power is turned off, the working pressure port is turned off, and the outlet is transferred to the cylinder head, and when the power is plugged in, the working pressure port is connected to the cylinder head, and the outlet is turned off), normally open type (when the gate valve is turned off, the working pressure port is connected to the cylinder head, and the outlet is turned off, and the valve is plugged in, the working pressure port is turned off, and the cylinder head is connected to the outlet), Versatility (allow valves to be connected in either normally open or normally closed or open and closed positions);
3) Four-way solenoid valve: generally used with the actual operation of double function cylinder, there are four or five pipe interconnecting port, a working pressure port, two cylinder heads and one or more exhaust pipe (oil) port.
2. Electric valve:
1) Valve body and electric angular path actuator supporting electric valve: electric actuator rotating valve plate Angle of view to control and control valve closing and control pipeline platform flow, electric actuator input shaft rotation less than a week, that is, less than 360 degrees, generally 90 degrees to complete the valve opening and closing process management. Most of these electric valves are disc valves, gate valves, plug valves, etc.
2) Valve body and multi-rotary electric actuator (corner 360 degrees) supporting electric valve, multi-rotary electric actuator input shaft swing more than a week, that is, more than 360 degrees, generally need a single turn to achieve the valve opening and closing process management. Most of the electric valve doors are stop valves, stop valves, etc.;
3) The valve body and the straight process electric actuator (uniform linear motion) matching electric valve: the movement of part of the input shaft of the electric actuator is uniform linear motion, rather than rotation, to complete the opening and closing operation by adjusting the valve plate of the lifting valve. Most of these electric valve doors are regulating valves, single-seat regulating valves, double-seat regulating valves, etc.;
Three, control methods
1, the solenoid valve according to the electromagnetic coil drive, can only play the effect of opening or closing;
2, the electric valve to use the motor driver, open or close the whole process must be compared to the solenoid valve time, and according to the actuator input current, voltage signal to adjust the valve, the general control signal is: current signal (4 ~ 20mA, 0 ~ 10mA) or voltage signal (0 ~ 5V, 1 ~ 5V).
Iv. Application Field:
1, the solenoid valve is promoted by the magnet coil, the driving force is small, it is easy to be destroyed by the impact of the current, generally suitable for specifications below DN50 pipeline, power switch posture time is short, and there are professional high frequency solenoid valve, very suitable for high posture frequency and the requirement of timing switch short pipeline application;
2, the promotion of electric valve is generally motor, more resistant to voltage impact, large driving force, can control the small-caliber valve body, and the electric valve can control the flow of the pipeline platform, very suitable for small-caliber pipeline or the need to control the total flow of the pipeline application;
3, the solenoid valve is generally off the power can be calibrated, electric valve calibration must be more calibration equipment;
4, the solenoid valve suitable material is relatively, sulfuric acid, caustic soda solution, water, gas, oil, vapor and other substances can be used, but for the medium viscosity, cleaning level is very high requirements, before the use of the solenoid valve to install the filter device, to ensure the normal operation of the solenoid valve, low leakage rate, high safety factor;
5, electric valve is not only suitable for the operation of the general fluid medium, and especially suitable for the operation of paper paddle, waste water, containing fibers and fine solid particles of material, the cleanliness of the medium is not too high, leakage rate to relative solenoid valve higher.
The high efficiency sealing standard of oil temperature coal coke oil pump and electric valve must be a means to take out the old disc root to replace the new disc root to use special tools, and with the tightening tool torque screw nut. In addition, you should always use standard safety equipment and follow relevant safety specifications. Before construction, first understand the following machines and equipment: automatic cutting machine to check the root ring, torque wrench or wrench correction, safety helmet, inside and outside brake disc, lubricants of fastener, rearview mirror, root removal device, etc. Cleaning and inspection. Slowly loosen the screw nut of the packing box, release every residual pressure in the disc parts, and remove all the old disc roots…
Standard for efficient sealing of medium temperature coal coke pumps and electric valves for fuel oils
1, must be a means to take out the old root to replace the new root to use special tools, and with the tightening torque cap nuts. In addition, you should always use standard safety equipment and follow relevant safety specifications. Before construction, first understand the following machines and equipment: automatic cutting machine to check the root ring, torque wrench or wrench correction, safety helmet, inside and outside brake disc, lubricants of fastener, rearview mirror, root removal device, etc.
2. Cleaning and inspection. Slowly loosen the screw nut of the stuffing box, release every residual pressure in the disc parts, remove all the old disc roots, and deeply clean the stuffing box of the shaft/rod; Check the shaft/rod for erosion, pitting, scratching or excessive damage; Check other parts whether there are burrs, cracks, damage, it will reduce the service life of the disc; Botebon checks whether there is too much gap in the stuffing box, and the axial force level of the shaft/bar; Disassemble and replace parts with certain deviation; Check the old root, as an important basis for failure description, to find the main reason for early failure of the root.
3, measurement and record. Record the diameter of the shaft/rod, the diameter and depth of the stuffing box, and record the spacing from the bottom to the top of the stuffing box when the edible oil seal ring is used.
4. Pick the root. Ensure that the selected root should meet the requirements of the system software and equipment operating conditions; According to the measurement records, calculate the cross-sectional area of the root and the total number of root rings; Test the root of the plate to ensure that it is flawless; Before the construction of fuel oil medium temperature coal coke pump, ensure that the equipment and root cleaning.
5. Prepare the root ring in advance. Winding the winding on the shaft of appropriate specifications, or using the corrected winding ring automatic cutting machine; Simply laser cut the disc into joint (square) or miter (30-45 degrees) as required, cut one ring at a time, and use the shaft or seat to test the specifications.
The disc is moulded to ensure that the ring specifications fit accurately with the shaft or seat. If necessary, laser cut packing rings are required according to the disc manufacturer’s operating instructions.
6. Assemble the tray. Carefully install a disc ring each time, and surround each ring around the shaft or seat. Before using the next ring, the fuel oil medium temperature coal coke pump should make sure that the ** ring has been completely in place in the stuffing box, and the next ring should be sorted separately with a minimum interval of 90 degrees, and the general requirement is 120 degrees. After the last ring is installed, tighten the nut with your hand and seal the lid evenly diastolic. If there is a skeleton seal ring, it should be checked and the spacing above the stuffing box is correct or not. And ensure that the shaft or seat can rotate freely.