Classification, installation and maintenance of pressure reducing valve
Classification:
Release Time：2018-01-15
1. classification: according to the structure can be divided into film type, spring film type, piston type, lever type and bellows type. According to the number of seat can be divided into single seat type and double seat type. According to the position of the disc can be divided into positive and reaction type. According to the use of media can be divided into steam pressure reducing valve, air pressure reducing valve, gas pressure reducing valve and so on. 2. selection: according to the requirements of the use of selected pressure reducing valve type and pressure regulating accuracy, and then according to the maximum output flow required to select its diameter. When determining the air supply 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 separation filter and before the oil mist device or the constant value device, and pay attention not
1. classification:
According to the structure, it can be divided into film type, spring film type, piston type, lever type and bellows type. According to the number of seat can be divided into single seat type and double seat type. According to the position of the disc can be divided into positive and reaction type. According to the use of media can be divided into steam pressure reducing valve, air pressure reducing valve, gas pressure reducing valve and so on.
2. selection:
According to the requirements of the use of selected pressure reducing valve type and pressure regulation accuracy, and then according to the required maximum output flow to choose its diameter. When determining the air supply 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-separating air filter and before the oil mist device or the constant value device, and be careful not to connect its inlet and outlet in reverse. When the valve is not in use, the knob should be relaxed to avoid frequent pressure deformation of the diaphragm and affect its performance.
3. valve installation and maintenance should pay attention to the following matters:
1. In order to facilitate operation and maintenance, the valve is generally installed upright on a 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 after the valve, a pressure reducing valve should be installed at least 4M away from the valve outlet.
4. basic performance
(1) Pressure regulating range:
Pressure regulating range refers to the pressure reducing valve output pressure P2 can adjust the control range, in this adjustable range required to achieve the specified accuracy. The pressure regulating range is mainly related to the stiffness of the pressure regulating spring.
(2) Pressure characteristics:
The pressure characteristic refers to the characteristic of the output pressure fluctuation caused by the input pressure fluctuation when the flow rate g is a fixed 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-the fixed value is basically unchanged with the input pressure.
(3) Flow characteristics:
Flow characteristics refers to the input pressure-timing, the output pressure with the output flow g changes and the change of the holding. When the flow rate g changes, the smaller the change in the output pressure, the better. Generally, the lower the output pressure, the smaller the fluctuation with the change of the output flow.
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