How to solve the air consumption problem of NORDSON solenoid valve
When the NORDSON solenoid valve does not require scheduling, block the gas source. When adjustment is needed, open the solenoid valve and connect the gas source for scheduling. After blocking the gas source for a period of time (usually more than half an hour), the orientation of the electric gate valve will not change due to a certain air pressure inside the cylinder. But over time, the orientation of the valve will deviate from the required orientation.
At this point, the NORDSON solenoid valve must be adjusted from the beginning to the desired orientation. The action of the solenoid valve is controlled by the computer through valve position signals. In this way, the air consumption of electric gate valves significantly decreases. The working environment temperature of electric gate valves should be between -30 and+60, with a relative humidity not exceeding 95% and 95%.
The front and rear positions of NORDSON solenoid valves should have straight pipe sections with a length not less than 10 times the diameter of the pipeline (10D) to prevent the valve's straight pipe section from being too short and affecting flow characteristics.
The installation position of NORDSON solenoid valve requires a certain height from the ground, and there should be a certain space above and below the valve for disassembly and repair. Regarding electric gate valves equipped with pneumatic valve positioners and handwheels, it is necessary to ensure easy operation, observation, and adjustment.
NORDSON solenoid valves should be installed on horizontal pipelines, perpendicular to the pipeline, and generally supported under the valve to ensure stability. For special occasions where electric gate valves need to be installed horizontally on vertical pipelines, they should also be supported (with small-diameter electric gate valves outside). During installation, it is necessary to prevent additional stress on the electric gate valve.
1. Due to structural constraints, this structure is not suitable for vacuum butterfly valves with diameters below DN200. The reason is that the entire structure of the vacuum butterfly valve plate is too thick, resulting in high flow resistance.
2. The sealing surface between the NORDSON solenoid valve plate and the vacuum butterfly valve seat is sealed by the torque of the transmission equipment to press the vacuum butterfly valve plate against the vacuum butterfly valve seat. In the case of positive flow, the higher the medium pressure, the tighter the sealing and kneading. When the medium in the flow channel flows backwards and the unit positive pressure between the vacuum butterfly valve plate and the vacuum butterfly valve seat increases with the increase of medium pressure, the seal will initially leak when it is less than the medium pressure.
3. Due to the multi-layer soft and hard stacked sealing ring fixed on the valve plate, when the valve plate is normally open, the medium will cause a positive flushing on its sealing surface. After the soft sealing tape in the metal interlayer is flushed, it directly affects the sealing function.
4. The high-performance ventilation vacuum butterfly valve is characterized in that the valve seat sealing ring is composed of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring.
The sealing surface of the NORDSON solenoid valve seat is a slanted cone structure, and a heat-resistant and corrosion-resistant alloy material is welded onto the slanted cone surface of the vacuum butterfly valve plate; The structure in which the spring fixed between the scheduling ring pressure plates is installed together with the scheduling bolts on the pressure plates. This structure effectively compensates for the elastic deformation of the joint between the shaft sleeve and the valve body, as well as the valve stem under medium pressure, and solves the sealing problem of vacuum butterfly valves during bidirectional communication medium transportation.
The NORDSON solenoid valve uses a soft T-shaped multi-layer stainless steel sheet on both sides to form a sealing ring, which has two layers of metal hard seal and soft seal. It has zero leakage sealing function regardless of low temperature or high temperature.
Experimental results have shown that when the flow direction of the medium is the same as the rolling direction of the butterfly valve, the pressure on the sealing surface is affected by the torque of the transmission equipment and the pressure of the medium on the vacuum butterfly valve plate. When the positive medium pressure increases, the more tightly the inclined conical surface of the vacuum butterfly valve plate and the sealing surface of the vacuum butterfly valve seat are kneaded, the better the sealing effect.
When there is a reverse flow situation, the sealing between NORDSON solenoid valves relies on the torque of the driving equipment to press the vacuum butterfly valve plate against the vacuum butterfly valve seat. With the increase of reverse medium pressure, when the unit positive pressure between the vacuum butterfly valve plate and the vacuum butterfly valve seat is less than the medium pressure, the deformation energy stored by the spring of the dispatch ring after being loaded can compensate for the tight pressure of the sealing surface between the vacuum butterfly valve plate and the vacuum butterfly valve seat, playing an active compensation effect.
Therefore, the NORDSON solenoid valve in this utility model is not installed with multiple layers of soft and hard sealing rings on the valve plate as in the existing technology, but directly installed on the valve body. Adding a scheduling ring to the pressure plate and vacuum butterfly valve seat is a very desirable bi-directional hard sealing method.
It is a rotary ball valve with a 90 ° angle, good sealing function, large flow capacity, low flow resistance coefficient, simple structure, easy repair, long service life, and the valve body channel and connecting pipe diameter are equal and form one diameter. The medium can flow through almost without loss. Can be equipped with dual effect or single effect actuators. Pneumatic ball valves are generally used in applications with strict sealing requirements. In addition to controlling gas, liquid, and steam media, they are also suitable for controlling sewage and media containing fibrous impurities. They are widely used in the fields of petroleum, chemical, metallurgical, light industry, papermaking, power plants, refrigeration, and other work areas.
NORDSON solenoid valve is an important type of valve that is widely used in industries such as petrochemicals and long-distance pipelines.
The closure of NORDSON solenoid valve is a ball (or partial ball) with a hole, and the NORDSON solenoid valve stem rolls to complete the opening or closing of the valve.
NORDSON solenoid valve can be fully closed and opened by rotating 90 °. Compared with gate valves and globe valves of the same standard, ball valves have smaller volume and lighter weight, making them easier to install in pipelines.
Brief repair and handling of NORDSON solenoid valve:
Having a long service life and repair free period will rely on the following factors: normal working conditions, adherence to a harmonious temperature/pressure ratio, and reasonable corrosion data. Attention:
1. When the ball valve is in a closed state, there is still pressurized fluid inside the valve body
2. Before repair, relieve the pipeline pressure and place the valve in the open position
3. Before repair, disconnect the power or gas source
4. Before repair, detach the actuator from the bracket and reassemble it
1. Clean and inspect the disassembled parts, replace their valve seats, valve cover gaskets, and other sealing components.
2. Assemble in the reverse order of disassembly.
3. Use the specified torque to cross lock the flange connection bolts.
4. Tighten the valve stem nut with the specified torque.
5. After installing the actuator of the NORDSON solenoid valve, input the corresponding signal to drive the valve core to rotate by rotating the valve stem, causing the valve to reach the open and closed positions.
6. If possible, please perform pressure seal testing and testing on the valve according to relevant standards before reinstalling the pipeline.