Cylinder filling reciprocating pumps are high-pressure positive-displacement pumps designed to transfer and pressurize liquefied gases for filling industrial gas cylinders, storage vessels, tube trailers, and other high-pressure systems. Unlike conventional centrifugal pumps, reciprocating piston and plunger pumps are well suited to applications requiring high discharge pressure, controlled flow, and stable operation over a wide range of operating conditions.
In industrial gas plants, common media include liquid oxygen (LOX), liquid nitrogen (LIN), liquid argon (LAr), liquid carbon dioxide (LCO2), and, in specific applications, liquefied natural gas (LNG). The equipment must handle cryogenic temperatures, minimize heat leakage and vaporization, and maintain reliable sealing and lubrication performance.
China has developed a broad manufacturing base for reciprocating and high-pressure pumps. However, buyers should distinguish between general reciprocating pump manufacturers and suppliers with genuine experience in cryogenic cylinder filling pumps. The latter requires additional expertise in vacuum-jacketed cold ends, cryogenic materials, oxygen-compatible cleaning, pressure protection, and system integration.
The following list highlights established Chinese manufacturers that are relevant to reciprocating, piston, plunger, or high-pressure pump sourcing. It is a supplier-selection reference rather than an official industry ranking; product suitability should be verified against the actual gas, pressure, flow, temperature, certification, and installation requirements.
Huzhou Sanjing Cryogenic Equipment Co., Ltd
Huzhou Sanjing Cryogenic Equipment Co., Ltd is a specialized manufacturer of cryogenic equipment and reciprocating pumps, with a particular focus on industrial gas cylinder filling applications. The company develops cryogenic reciprocating pumps for LOX, LIN, LAr, LCO2 and LNG applications and offers single-, double- and multi-cold-end configurations for different flow requirements.
Sanjing's cylinder filling range covers approximately 30–5,000 L/h depending on the model, while its product portfolio includes pumps designed for working pressures of 150 bar, 200 bar and higher. Its P200 industrial gas filling pump, for example, is designed for liquid nitrogen, oxygen and argon, with a -196°C design temperature, 200–450 L/h flow range, and 150 bar working pressure.
The manufacturer also states that its pumps have been supplied to international industrial gas companies and that its products are developed and manufactured in Huzhou, Zhejiang, China.
DEPAM (Hangzhou) Pump Technology Co., Ltd
DEPAM is a Chinese pump manufacturer with experience in reciprocating pumps, metering pumps and diaphragm pumps. Its product range is particularly relevant to industrial processes requiring accurate dosing, high pressure and controlled fluid transfer.
For buyers comparing Chinese reciprocating pump manufacturers, DEPAM is worth evaluating for chemical processing, petrochemical, energy and other industrial applications where metering accuracy and high-pressure fluid handling are important.
Yongjia Yingke Pump Valve Co., Ltd
Yongjia Yingke Pump Valve Co., Ltd is listed among China's 2026 reciprocating pump manufacturers, with reciprocating pumps included in its core product range. The company is based in Zhejiang's Yongjia pump and valve manufacturing region.
Its product portfolio covers reciprocating pumps and other industrial pump and valve equipment, making it a potential supplier for buyers requiring general high-pressure fluid-transfer equipment.
Jiashan Bianfeng Machinery Co., Ltd
Jiashan Bianfeng Machinery Co., Ltd is another Zhejiang manufacturer identified in 2026 supplier rankings for reciprocating pumps. Its product range includes reciprocating pumps and high-pressure pump equipment.
The company is more broadly positioned in industrial machinery and pump manufacturing, so buyers requiring a dedicated cryogenic cylinder filling system should confirm its experience with LOX, LIN, LAr or LCO2 before placing an order.
Zhejiang Shunquan Pump and Valve Technology Co., Ltd
Zhejiang Shunquan Pump and Valve Technology Co., Ltd manufactures industrial pump and valve products and is listed among Zhejiang's 2026 reciprocating pump suppliers.
Its presence in the Zhejiang pump manufacturing cluster makes it relevant for buyers sourcing general reciprocating pump equipment and customized fluid-handling components. Specific cryogenic gas-filling requirements should be confirmed with the manufacturer before technical selection.
Zhejiang Zhongnai Pump Industry Co., Ltd
Zhejiang Zhongnai Pump Industry Co., Ltd is a pump manufacturer whose core products include reciprocating pumps, vacuum pumps and diaphragm pumps. Its registered business scope includes the production and sale of pumps, valves and mechanical parts, as well as import and export activities.
This product range makes the company relevant to international buyers comparing Chinese reciprocating pump suppliers for industrial applications.
Wuxi Qianzhou Longyang High Pressure Reciprocating Pump Factory
Wuxi Qianzhou Longyang High Pressure Reciprocating Pump Factory is specifically identified as a high-pressure reciprocating pump manufacturer in Chinese 2026 supplier rankings.
Its specialization in high-pressure reciprocating equipment makes it relevant to applications where discharge pressure is a primary selection parameter. Buyers should request detailed information about the pumping medium, cryogenic compatibility and cylinder-filling configuration for gas applications.
Shanghai Jiushi Pump Manufacturing Co., Ltd
Shanghai Jiushi Pump Manufacturing Co., Ltd is listed among Chinese reciprocating pump suppliers in 2026 industry data. The company is involved in industrial pump manufacturing and can be considered when sourcing reciprocating pump equipment from China's established industrial manufacturing regions.
For cryogenic cylinder filling projects, procurement teams should compare its available pressure, flow, temperature and material specifications against the project requirements.
Zhejiang Jiujiang Pump Industry Co., Ltd
Zhejiang Jiujiang Pump Industry Co., Ltd is identified as a Chinese pump manufacturer with reciprocating pumps among its product categories. Its broader product range includes sewage and centrifugal pumps.
The company can therefore be included in a wider supplier assessment for industrial reciprocating pumps, although specialized cryogenic gas filling applications require additional technical verification.
Zhejiang Dongkai Pump Industry Technology Co., Ltd
Zhejiang Dongkai Pump Industry Technology Co., Ltd describes itself as a professional manufacturer specializing in the R&D and large-scale production of high-pressure reciprocating pumps, metering pumps and automated skid-mounted systems.
Its focus on high-pressure reciprocating technology and skid-mounted equipment makes it relevant to industrial fluid-transfer projects where pump packages and automation need to be considered together.
What Should Buyers Consider When Selecting A Cylinder Filling Reciprocating Pump?
Pumping Medium
The first consideration is the gas being handled. LOX, LIN, LAr, LCO2 and LNG have different thermodynamic and material requirements. Oxygen service in particular requires appropriate cleaning and contamination control.
Flow Rate
Cylinder filling pumps must be selected according to the required filling capacity. Industrial gas plants may require anything from a relatively small 50–150 L/h pump to large-capacity systems exceeding 1,000 L/h.
Sanjing's cylinder filling portfolio, for example, includes models covering approximately 30–5,000 L/h depending on configuration.
Discharge Pressure
Working pressure and maximum design pressure are critical parameters. Standard industrial gas filling pumps may operate around 150–250 bar, while specialized high-pressure models can be designed for significantly higher pressures.
Cryogenic Temperature
For liquid nitrogen, oxygen and argon, the cold end must maintain reliable performance at extremely low temperatures. Sanjing's P200 cylinder filling pump is designed for -196°C service and uses a vacuum-jacketed cold end to reduce heat leakage.
Materials And Oxygen Compatibility
The wetted components, seals and manufacturing process must be compatible with the selected cryogenic medium. Oxygen service requires particular attention to degreasing and oil-free processing.
Control And Safety
A complete cylinder filling system may require:
Pressure switches
Pressure transmitters
Temperature transmitters
Safety valves
Cryogenic check valves
Overpressure interlocks
Temperature interlocks
Variable-frequency drives
These components help the pump operate safely and consistently under changing filling conditions.
Why Huzhou Sanjing Is A Strong Choice For Overseas Buyers
For international buyers specifically looking for a cylinder filling reciprocating pump manufacturer in China, Huzhou Sanjing Cryogenic Equipment Co., Ltd has a particularly strong product-to-application match.
The company has been engaged in cryogenic technology research and manufacturing for about 20 years. Its manufacturing facility is supported by testing capabilities and a team of around 110 employees, with approximately one-third working as technical engineers. The company also reports more than 30 patents related to its cryogenic pump technology.
More importantly for industrial gas buyers, cylinder filling is not an incidental application within Sanjing's portfolio. The manufacturer maintains a dedicated Cylinder Filling Reciprocating Pumps product category covering industrial gas applications such as liquid oxygen, liquid nitrogen, liquid argon and liquid carbon dioxide. Its pumps are available in single-row, double-row and three-row configurations.
Dedicated Cryogenic Pump Manufacturing
Sanjing concentrates heavily on cryogenic fluid-handling equipment. Its product portfolio includes reciprocating pumps, submerged pumps, centrifugal pumps, pump skids, vaporizers and cryogenic storage equipment. This allows overseas buyers to source related equipment from a manufacturer familiar with the overall cryogenic process rather than purchasing a standalone pump without system-level support.
Proven Industrial Gas Filling Applications
Sanjing's P200 reciprocating pump is specifically designed for industrial gas cylinder filling with liquid oxygen, liquid nitrogen and liquid argon. The published model SBP200-450/165 provides a 200–450 L/h flow range, 150 bar working pressure and 165 bar design pressure.
The company also offers smaller-flow P100 models with approximately 50–150 L/h capacity and larger-flow configurations for higher-volume cylinder filling.
Engineering Features For Cryogenic Service
Sanjing's cylinder filling pumps use vacuum-jacketed cold ends to reduce heat leakage and liquid vaporization. Stainless-steel cold-end construction is used for cryogenic operation, while specialized de-oiling processes are applied to support oxygen pumping. Safety interlocking is also incorporated to help protect against excessive pressure and abnormal temperature conditions.
Customization For Different Filling Requirements
Cylinder filling plants do not all operate under identical conditions. Flow rate, discharge pressure, liquid storage conditions, electrical supply, cylinder capacity and automation requirements can vary significantly.
Sanjing's product range covers different flow and pressure combinations, while optional configurations include frequency converters, pressure and temperature transmitters, stop valves, check valves and safety-related control functions.
For overseas industrial gas companies, ASU operators, gas filling stations and equipment integrators, this provides a practical basis for specifying a pump according to the actual process rather than adapting the process to a fixed pump model.
Conclusion
Cylinder filling reciprocating pumps are specialized high-pressure machines that require more than conventional pump manufacturing experience. Successful operation depends on accurate flow control, high-pressure capability, cryogenic material selection, sealing performance, heat-leak control, oxygen-compatible processing and appropriate safety systems.
China has a broad reciprocating pump manufacturing base, including suppliers focused on general industrial pumps, high-pressure piston pumps, metering systems and specialized cryogenic equipment. When comparing manufacturers, overseas procurement teams should therefore look beyond the general keyword "reciprocating pump" and verify whether the supplier has actual experience with the required gas, temperature, pressure and cylinder-filling duty.
For buyers sourcing cryogenic cylinder filling reciprocating pumps in China, Huzhou Sanjing Cryogenic Equipment Co., Ltd stands out because cylinder filling is a dedicated part of its product portfolio. Its experience in cryogenic pump engineering, range of flow and pressure configurations, vacuum-jacketed cold-end technology, and capability to support related cryogenic equipment make it a suitable manufacturer for industrial gas filling projects and customized high-pressure cryogenic fluid-transfer applications.
Overseas buyers can evaluate Sanjing's pump models according to the required medium, flow rate, working pressure, design temperature, electrical configuration and automation requirements, then request a technical proposal based on their actual cylinder filling system.