The power plant transformer pressure relief valve YSF9-70/130 is a key device to ensure the safe operation of oil-immersed transformers. Its core function is to quickly release pressure when the internal pressure is abnormal, and resist external environmental interference through multiple protection designs. This article analyzes the protection capabilities and technical characteristics of this type of pressure relief valve from the dimensions of dustproof, waterproof, and bird damage prevention.

I. Structure and protection design of pressure relief valve YSF9-70/130

The meaning of the pressure relief valve YSF9-70/130 model is: YSF represents pressure relief valve, 9 is the design serial number, 70 represents the opening pressure of 70kPa, and 130 is the injection diameter of 130mm. Its core components include springs, pressure diaphragm discs, sealing pads, signal rods and protective shells. The structural design takes into account functionality and environmental adaptability:

Dustproof design:

The signal rod and cover use double-layer sealing rings (made of fluororubber), with a protection level of IP65, which can block the intrusion of particles above PM10. The injection port is equipped with a stainless steel filter (aperture ≤1mm) to prevent foreign matter from blocking the flow channel.

Waterproof design:

The YSF9-70/130 junction box of the pressure relief valve adopts a cast aluminum shell and is filled with epoxy resin. The waterproof performance meets the IP67 requirements of the IEC 60529 standard and can withstand immersion in 1m water for 30 minutes. The contact surface between the diaphragm and the valve body adopts a stepped sealing structure, with a nitrile rubber gasket, and the leakage rate is less than 0.1mL/min at a pressure of 70kPa.

Anti-bird damage design:

The top cover is designed as an inclined arc surface to prevent birds from staying or nesting. After the signal rod is activated, it extends 30-46mm from the cover, and the surface is coated with a red reflective coating, which has both warning function and bird repellent effect.

II. Key protection performance verification

1. Dustproof capability test

According to GB/T 4208-2017 standard, the pressure relief valve YSF9-70/130 was subjected to dust test: it was continuously operated for 8 hours in a closed cabin with a dust concentration of 5g/m3, and no particulate matter deposition was detected inside. The filter blockage rate was less than 5%, and the injection flow rate remained above 95% of the rated value (130mm diameter corresponds to 200L/s).

2. Waterproof and sealing performance

Static water pressure test: at 1.2 times the opening pressure (84kPa), the valve body had no leakage, and the compression deformation of the sealing gasket was less than 0.2mm.

High temperature and high humidity test: placed in an environment of 85℃ and 95% relative humidity for 500 hours, the insulation resistance was greater than 100MΩ, and the electrical signal had no drift.

3. Anti-environmental interference design

Anti-corrosion coating: The shell adopts hot-dip zinc + polyester powder spraying, and the salt spray resistance test reaches 1000 hours (ISO 9227 standard).

Anti-vibration design: The mounting bracket can withstand 5-150Hz random vibration, with an amplitude of ≤0.5mm, to avoid mechanical loosening and seal failure.

III. Protection reinforcement measures in practical applications

Regular maintenance: Clean the fuel injection filter every 6 months and check the elasticity of the sealing rubber pad (replacement is required if the Shore hardness decreases by ≤10%). Test the action sensitivity of the signal rod every year to ensure that the stroke error is less than ±2mm.

Environmental adaptation transformation: Install a wind shield in windy and sandy areas to reduce the frequency of filter cleaning. Coastal power plants use the TH type tropical protection version to enhance the ability to prevent salt spray.

Intelligent monitoring upgrade: Install a 4-20mA pressure sensor to monitor the pressure changes inside the fuel tank in real time, and the warning threshold is set to 80% of the opening pressure (56kPa). The alarm signal is connected to the power plant DCS system through a wireless transmission module to achieve remote status monitoring.

The pressure relief valve YSF9-70/130 achieves effective protection against dust, water vapor, and biological invasion through sealing structure optimization, material upgrades, and intelligent monitoring. Its design takes into account both reliability and environmental adaptability, and can still ensure the safe operation of transformers under complex working conditions in power plants. Regular maintenance and targeted transformation can further improve protection efficiency and extend equipment life.

When looking for high-quality, reliable pressure relief valves, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

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