（一）review
Pressure-relief devices are the company's product design, manufacturing experience for many years, and absorb foreign advanced product structure, the technology optimization design of pressure-relief devices.
（二）Design parameters
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system
composition
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parameters
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Reduced pressure parts
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1.Imported steam pressure
：P1≤ 3.82 Mpa
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Pressure reducing valve
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2.Imported steam temperature
：T1≤ 450 ℃
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The throttling orifice plate
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3.Export steam flow
：30%Q~100%Q
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4. The outlet steam pressure: export regulation of steam pressure P2 precision is not lower than 2.5
level
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Security section
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5. Noise: when the equipment normal operation, in the downstream one meter, the temperature and pressure-releasing valve an meters measuring the noise from the wall at the same time, the step is not greater than 85 db noise
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Spring loaded safety valve
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Pilot operated the main safety valve
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The main safety valve and impulse safety valve
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The basic design
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Instrument parts
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Design criteria
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《NB/T47033-2013》Desuperheating decompression device
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Pressure gauge
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Pressure transmitter
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Design pressure
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According to the actual design pressure
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Connection part
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Design temperature
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Design temperature
≤ 450 ℃
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Connection accessories, flanges, fasteners, etc
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Design size
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Steam outlet
DN200 to DN700 (8" to 28")
Or according to customer's requirement
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Drive way
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Electric actuators
，Pneumatic actuators
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installation
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Horizontal installation
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The connection method
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Flange, welding
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（三）Structural characteristics of
1. The pressure relief system adopts double seat valve structure, unbalanced force is small, the adjusting range is big, smooth movement, no jam phenomenon.
2. Compact structure, easy to use, suitable for most of the working condition of reduced pressure.
3. The pressure reducing valve with various diameters and different flow coefficient Cv value selection, make the pressure regulation system to adjust the sensitivity and accuracy is greatly increased.
4. The pressure reducing valve with straight travel actuators, in addition to the traditional levers hinge mechanism, reduce the intermediate links of idle motion and improve the sensitivity and accuracy of the adjustment system.
5. Pressure reducing valve with pneumatic diaphragm actuator, meet customers' special needs, has made full use of the advantages of energy.
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