Types of pressure reducing valves and installation matters

The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through adjustment, and relies on the energy of the medium itself to automatically keep the outlet pressure stable. From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of decompression. Then rely on the adjustment of the control and adjustment system to balance the fluctuation of the pressure behind the valve with the spring force, so that the pressure behind the valve remains constant within a certain error range. The types of pressure reducing valves can be divided into membrane type, spring membrane type, piston type, lever type and bellows type according to the structure. According to the number of valve seats, it can be single-seat and double-seat. According to the position of the valve disc, it can be divided into positive-action type and reverse-action type. According to the medium used, it can be divided into steam pressure reducing valve, air pressure reducing valve, gas pressure reducing valve, etc. The type of pressure reducing valve and the pressure regulating accuracy are selected according to the requirements of use, and then the diameter is selected according to the required maximum output flow. When determining the air source pressure of the valve, it should be greater than the maximum output pressure of 0.1MPa. The pressure reducing valve is generally installed after the water separator and before the lubricator or the setter, and be careful not to reverse its inlet and outlet; the knob should be loosened when the valve is not in use, so as to avoid the diaphragm often being affected by pressure deformation its performance. 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. When installing, pay attention to make the flow direction of the medium in the pipeline consistent with the direction of the arrow shown on the valve. 3. In order to prevent overpressure behind the valve, a pressure reducing valve should be installed not less than 4M away from the valve outlet. 4. Pressure regulation range: The pressure regulation range refers to the range within which the output pressure P2 of the pressure reducing valve can be adjusted and controlled, and the specified accuracy is required to be achieved within this adjustable range. The pressure regulating range is mainly related to the stiffness of the pressure regulating spring. 5. Pressure characteristics: pressure characteristics refer to the characteristics of output pressure fluctuations caused by input pressure fluctuations when the flow g is a fixed value. The smaller the output pressure fluctuation, the better the performance of the pressure reducing valve. The output pressure must be lower than the input pressure - a fixed value that basically does not change with the input pressure. 6. Flow characteristics: The flow characteristics refer to the persistence of the input pressure - timing, and the output pressure changing with the change of the output flow g. When the flow rate g changes, the smaller the change in output pressure, the better. Generally, the lower the output pressure, the less it fluctuates with the output flow.
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