A, classification: according to the structure form can be divided into film type, spring film type, piston type, lever type and bellows type. According to the number of seat can be single seat and double seat. According to the position of the valve can be divided into positive and negative acting type. According to the use of medium can be divided into steam pressure reducing valve, air pressure reducing valve, gas pressure reducing valve, etc.
Two, selection: according to the use of requirements to select the type of pressure reducing valve and pressure regulating accuracy, and then according to the maximum output flow required to choose its size. Determine the air source pressure of the valve, should be greater than the maximum output pressure of 0.1mpa. The pressure reducing valve is generally installed after the water filter, before the oil mist or fixed value, and pay attention not to the inlet and outlet of the reverse; The knob should be relaxed when the valve is not in use, so as not to affect the performance of the diaphragm often under pressure deformation.
Three, the installation and maintenance of the pressure reducing valve should pay attention to the following matters: 1, for the convenience of operation and maintenance, the valve is generally installed upright on the horizontal pipeline. 2. During installation, attention should be paid to the flow direction of the pipeline medium and the direction of the arrow shown on the valve rest. 3. In order to prevent overpressure after the valve, a pressure reducing valve should be installed at a place not less than 4M away from the valve outlet.
Four, basic performance
(1) Voltage regulating range:
The pressure regulating range refers to the range within which the output pressure P2 of the pressure reducing valve can be adjusted and controlled. The specified accuracy is required within this adjustable range. The pressure regulating range is mainly related to the stiffness of the pressure regulating spring.
(2) Pressure characteristics:
Pressure characteristic refers to the characteristic of output pressure fluctuation due to input pressure fluctuation when the flow rate G is a constant value. The smaller the output pressure fluctuation, the better the characteristics of the pressure reducing valve. The output pressure must be lower than the input pressure to basically not change with the input pressure.
(3) Flow characteristics:
Flow characteristics refer to the stability of the output pressure when the input pressure changes with the output flow G. When the flow rate G changes, the smaller the change of output pressure, the better. Generally, the lower the output pressure, the less fluctuation it will have with the output flow rate.
Supply SMC pressure reducing valve price installation and use of fault and troubleshooting method SMC filter pressure reducing valve fault and troubleshooting method one, SMC filter pressure reducing valve failure phenomenon: does not reduce the pressure
SMC filter pressure reducing valve fault analysis:
1. The oil outlet is blocked; The discharge pipe is connected with the return pipe, and there is a return oil pressure
2. The main spool is stuck in the fully open position
SMC filter pressure reducing valve exclusion method:
1. The drain line must be separated from the return line and returned to the tank separately
2. Repair and replace parts. Check the oil
Two, SMC filter pressure reducing valve fault phenomenon: pressure fluctuation instability fault analysis:
1. The oil was mixed with air
2. Damping holes are sometimes blocked
3. The roundness of the inner hole of the slide valve and the body exceeds the regulation, so that the valve is stuck
4. The spring is deformed or stuck in the slide valve, making it difficult to move the slide valve or the spring is too soft
5. The ball is not round, the ball does not fit well with the seat or the poppet valve is not installed correctly
SMC filter pressure reducing valve SMC filter pressure reducing valve exclusion method:
1. Remove air from oil
2. Clean damping hole
3. Repair valve hole and slide valve
4. Replace the spring
5. Replace the ball or disassemble the poppet valve for adjustment
1. There is a gas storage tank: the gas will run away from the drain when it starts ventilation, but if you hold the drain by hand, after a while, when the pressure gauge has a certain value, release your hand, the exhaust port will not exhaust, can be used normally.
2. In the absence of air storage tanks: when ventilation begins, the air outlet is closed. The gas is removed from the filter pressure reducing valve, and the exhaust port is blocked by hand. When the pressure reaches a greater value, the gas will still be discharged from the exhaust port and cannot be used.
Filtration pressure-reducing valves High sensitivity pressure-reducing valves should generally be installed horizontally in the pipeline. Pneumatic control valve is an essential accessory, the main role is to reduce the pressure of the air source and stabilize to a fixed value, so that the regulator can obtain a stable air source power for regulation and control.
SMC filter pressure reducing valve can be selected according to the output pressure accuracy requirements of precision precision valve; In the process of use, after the compressed air through the two-stage three-stage filter to remove the oil, water, dust and other impurities in the compressed air, ** improves the service life of the pressure reducing valve diaphragm and the precision of pressure regulation; Due to the long service life of the filter element, it can be repaired separately on the maintenance of the filter element and the decompression element without overall replacement, thus saving cost.
Filter pressure reducing valve adopts rolling diaphragm, when the input pressure fluctuation, pressure reducing valve diaphragm automatically adjust, so that the pressure stable output, ensure pressure stability.
The pressure of the filter reducing valve in the operating medium is reduced, and the opening of the opening and closing parts is adjusted by the function of the valve after pressure, so that the valve after pressure is kept within a certain range. Under the condition of constant changes in the inlet pressure, the outlet pressure is kept within the set range, and the subsequent life and production appliances are protected.
SMC filter pressure reducing valve by regulating the inlet pressure to reduce to a required outlet pressure, when the inlet pressure and flow has changes, by the energy of the medium itself automatically maintain the outlet pressure in a certain range, but the inlet pressure and outlet pressure difference must be 0.2mpa /CM
SMC filter pressure reducing valve working principle
SMC FILTER pressure reducing valve is to reduce the inlet pressure to a required outlet pressure by throttling the opening and closing parts, and keep the outlet pressure stable. Pressure reducing valve factory, adjust the spring in the uncompressed state, at this time the main valve disc and pay a disc in the closed state, when used according to clockwise adjust screw, compression adjusting spring, make the membrane valve open move pay disc, medium by a hole by paying the seat to b holes into the piston above, piston under the action of medium pressure, leaving the move down to promote the main valve seat valve, Make the medium flow after the valve.
By c below the hole into the diaphragm at the same time, when the valve after pressure set more than pressure, push the diaphragm up regulating spring compression, pay the disc to close the direction, then reduce flow into the piston at the top of the medium, pressure drops, also at this time the main valve disc on the main valve disc spring force to push down, the clearance of the main valve disc and the main seat is reduced, the medium flow also is less, The pressure after the valve also drops to a new balance, on the contrary, when the pressure after the valve is lower than the set pressure, the gap between the main valve disc and the main valve seat increases, the medium flow also increases, so that the pressure after the valve also increases to a new balance.
SMC FILTER pressure reducing valve depends on the internal flow channel of the valve to adjust and control the flow, it can automatically adjust the pipeline water pressure, reduce the use of manpower. When using the steam pressure reducing valve, it is found that the working state has been unstable. What causes him to appear in this situation in use? What should the user do?
, Material problems
SMC filter pressure reducing valve in the manufacture of steam pressure reducing valve, in order to reduce the cost. Made sealing surface material, material commonly use can also meet the normal situations, but used in high temperature, high pressure state, such as erosion is very easy to happen, lead to use very unstable steam pressure reducing valve, even result in gate valve damage, so choose door way, not to pursue cheap, ignored the role of gate valve, affect the work is done.
Second, the flow is highly variable
Because of the unstable transfer flow rate, the steam pressure relief valve will also appear unstable. And in this environment for a long time, the door valve will cause great harm. The use of stable steam pressure reducing valve, in this case is generally used in parallel steam pressure reducing valve. One is selected based on the highest traffic and one is selected based on the lowest traffic. Then parallel case, when the flow changes, adjust. This can be used in harsh environments and can accomplish the work required for steam relief valves.
Post time: Sep-29-2022