Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Development Zone, Heze City. With a registered capital of 50 million yuan and total assets of 500 million yuan, the company has 7 business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters. The main workshop spans 83,000 square meters. The company currently employs 710 people, including 247 engineering and technical personnel and 82 intermediate-level technicians. In December 2016, it was recognized as a "High-tech Enterprise" by the Science and Technology Department. In June 2021, it was identified as a "Specialized and New Enterprise in Shandong Province" by the Department of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Proper installation of the liquid oxygen tank safety valve is a crucial step in ensuring the safe operation of the tank. Here are the installation steps for the liquid oxygen tank safety valve:
Select the appropriate safety valve: Choose a safety valve that meets the design pressure and flow requirements of the liquid oxygen storage tank. Ensure the rated pressure and flow of the safety valve align with the tank's specifications and comply with relevant safety standards and regulations.
Valve Installation Location: Select a suitable location for the safety valve installation. Typically, the safety valve should be mounted on the top or side of the liquid oxygen storage tank to allow for timely pressure release in the event of overpressure.
Preparation for installation interfaces: Prepare the corresponding interfaces based on the connection method of the safety valve. This may include welding interfaces, threaded interfaces, or flange interfaces, etc. Ensure the sealing and firmness of the connections.
Install the safety valve: Mount the safety valve onto the prepared interface. Follow the installation instructions for the safety valve to ensure proper connection and tightening.
Adjustment and Testing: After installation, adjust and test according to the requirements of the safety valve. Ensure the opening and closing pressures of the safety valve meet the design specifications, and conduct a leak test to ensure its sealing.
Identification and Record: Label the safety valve with relevant information such as rated pressure, flow rate, and installation date. Additionally, record the installation details and test results of the safety valve for future reference and maintenance.
When installing the liquid oxygen storage tank safety valve, it is imperative to follow the relevant safety regulations and operational guidelines. If you lack the necessary experience and knowledge, it is advisable to seek assistance and guidance from experts to ensure the correct installation and reliable operation of the safety valve.

Liquid nitrogen tanks are equipment used for storing liquid nitrogen and are widely applied in the following fields: 1. Frozen Food and Refrigerated Logistics: Liquid nitrogen tanks are used in the frozen food and refrigerated logistics industry to freeze or refrigerate food and other perishable items, extending their shelf life and maintaining freshness. The low temperature of liquid nitrogen can quickly freeze food, preventing bacterial growth and spoilage. 2. Biological Sample Storage: Liquid nitrogen tanks are extensively used for the storage of biological samples, cells, tissues, and more. The low temperature of liquid nitrogen effectively preserves the integrity and viability of biological materials, used in medical research, biomedical engineering, and transplantation fields. 3. Laboratory Research: In scientific research and laboratories, liquid nitrogen tanks provide liquid nitrogen as a coolant and freezing medium. The low temperature of liquid nitrogen can be used for cooling laboratory equipment, material research, superconducting electronics, and low-temperature physics. 4. Metal Processing and Welding: Liquid nitrogen tanks are used in metal processing and welding to cool and control metal temperatures. Liquid nitrogen can rapidly cool metals, improve their hardness and strength, and reduce deformation and stress. 5. Gas Storage and Supply: Liquid nitrogen tanks are also used for storing and supplying nitrogen gas. Liquid nitrogen can be evaporated into gaseous nitrogen for applications such as gas shielded welding, gas fire suppression systems, gas analysis, and laboratory gas supply. In summary, liquid nitrogen tanks are widely used in the fields of frozen food, laboratory research, metal processing, and gas supply, providing storage and supply functions for liquid nitrogen at application sites.

The filling process for liquid nitrogen storage tanks generally includes the following steps:
Preparation: Ensure that the storage tank and filling equipment are in good condition with no damage or leaks. Check that the insulation layer of the tank is intact and undamaged.
Safety Inspection: Check the tank and its surrounding environment for safety. Ensure there are no flammable materials or other hazardous items around the tank.
Connect equipment: Link the filling equipment to the tank. Ensure the connection is secure and leak-free.
Prepare Liquid Nitrogen: Provide liquid nitrogen supply ensuring the quality and purity meet the requirements.
Turn on valves: Follow the operational instructions of the filling equipment to gradually open the corresponding valves, allowing liquid nitrogen to flow from the source to the storage tank.
Regulate Flow: Adjust the flow control valve of the filling equipment as needed to control the inflow speed of liquid nitrogen. Ensure the flow rate is moderate, avoiding too fast or too slow.
Monitor Liquid Level: Continuously monitor the liquid nitrogen level in the storage tank through a liquid level gauge or other level monitoring devices, ensuring the level remains within a safe range.
Cease Refilling: Close the valve of the refilling equipment once the liquid nitrogen is filled to the storage tank or reaches the desired level, halting the inflow of liquid nitrogen.
Disconnect: Disconnect the filling equipment from the storage tank and ensure there are no leaks at the connection point.
Safety Inspection: Recheck the tank and its surrounding environment for safety, ensuring there are no leaks or other potential hazards.
Please note that the process described here is for general reference only, and the actual filling process may vary depending on the specific type of tank and filling equipment. When performing filling operations for liquid nitrogen tanks, please adhere to the relevant operational specifications and safety requirements, and ensure that the operators are properly trained and skilled in safety matters.

To safely utilize liquid oxygen storage tanks, attention should be paid to the following aspects:
Training: Operators of liquid oxygen tanks must undergo training to understand the properties of liquid oxygen, safety operating procedures, and emergency response measures. Only trained personnel are authorized to operate liquid oxygen tanks.
Safety Operating Procedures: Establish and adhere to the safety operating procedures for liquid oxygen tanks, including proper operational procedures, protective measures, and emergency response plans. Ensure operators follow the procedures to minimize accident risks.
Equipment Inspection and Maintenance: Regularly inspect the condition of liquid oxygen tanks and related equipment, including valves, pipelines, pressure gauges, etc. Ensure that the equipment is in perfect condition without any damage, and promptly repair or replace any damaged parts.
Leakage Control: Equipped with leak detection and alarm systems to promptly identify and control leaks in liquid oxygen storage tanks. Upon detection of a leak, immediate action should be taken to contain the source of the leak and initiate repairs.
Fire Prevention Measures: Liquid oxygen contains a high oxygen concentration, which is prone to causing fires. To prevent and contain fires, firewalls and fire-resistant coatings are set up around the liquid oxygen storage tanks.
Electrostatic Protection: Electrostatic buildup in liquid oxygen tanks can cause sparks, increasing the risk of fire. Measures such as using electrostatic conductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Ventilation Requirements: Ensure adequate ventilation within the enclosed space of the liquid oxygen storage tank to expel gases produced by the evaporation of liquid oxygen. Avoid excessive oxygen concentration and minimize
Our company attaches great importance to technological innovation and R&D design. We have one municipal-level enterprise technology center in Heze City, equipped with testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and more. We have over 600 types of equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, and more. Our key products such as temperature and pressure vessel welding, biomass boiler emissions reduction, and waste heat recovery have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have accumulated 27 authorized utility model patents, 16 authorized invention patents, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. Our technical team, in collaboration with Professor Li Yajiang of Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + wire filling argon arc welding (PAW-GTAW) technology. The provincial-level scientific and technological achievement identification has confirmed that our technology level in deep cryogenic container manufacturing has reached an international standard. Choose Zhongjie Special Equipment, and let's create brilliance together!