quality Unloading compressor

Release time:

Nov 14,2025

Source:

The unloading compressor is a critical component in many industrial settings, especially in systems requiring efficient air compression. This type of compressor is designed to automatically adjust the pressure within a system by unloading when it reaches a specified pressure threshold, reducing energy consumption and improving overall system efficiency

LPG Compressor

Working principle

This series of oil-free lubrication compressor is one of the first products produced by our factory in China. The product has low rotational speed, high strength of components and is characterized by smooth operation, long service life and easy maintenance. Among them, ZW series compressor is in the form of unit. It integrates compressor, gas-liquid separator, filter, two-position four-way valve, safety valve, check valve, explosion-proof motor and chassis. It is characterized by small volume, light weight, low noise, good sealing, easy installation and easy operation.

The product is mainly used for unloading, loading, dumping, residual gas recovery and residual liquid recovery of liquefied petroleum gas/carbon 4, propylene and liquid ammonia. It is widely used in gas, chemical, energy and other industries, and is the key equipment for gas, chemical, energy and other industries.

Note: In the process of unloading, the compressor pressurizes the gas from the storage tank and then presses it into the tanker through the gas-phase pipeline, and presses the liquid from the tanker to the storage tank through the pressure difference of the gas-phase in order to complete the unloading process. When the gas phase is pressurized, the temperature of the gas phase will rise, and at this time there is no need for forced cooling, because if the gas phase is compressed and then cooled, it is easy to liquefy, and it is difficult to build up the differential pressure of the gas phase, which is not conducive to the replacement of the gas phase with the liquid phase, in short, it will cause the unloading process to be prolonged. If residual gas recovery is required, during the residual gas recovery operation, a cooler can be selected to forcefully cool the gas phase so that the residual gas can be recovered as soon as possible.

The loading process is the opposite of the unloading process.

Main Specifications

Structural type	Vertical (Z), Angular (V)
Discharge pressure	1.6,2.4Mpa
Flow range	0.25~8M³/min
Motor power	4~110kw
Application	Mainly used for LPG/C4， propylene, liquid ammonia unloading, loading, tank pouring, residual gas recovery and residual liquid recovery. Widely used in gas, chemical, energy and other industries, is the key equipment of gas, chemical, energy and other industries.

LPG/Carbon 4 loading and unloading compressor

Serial No.	Model Number	Motor Power(kw)	Dimension(mm)	Loading and unloading(t/h)
1	ZW-0.25/10-16	4	1000x710×865	~5.5
2	ZW-0.4/10-16	5.5	1000×710x865	~9
3	ZW-0.5/10-16	7.5	1000×710x865	~11
4	ZW-0.6/10-16	7.5	1000x710×865	~13
5	ZW-0.8/10-16	11	1000x710x865	~17.5
6	ZW-1.1/10-16	15	1000x710×865	~24
7	ZW-1.35/10-16	18.5	1000x710×865	~30
8	ZW-1.6/10-16	22	1400x900x1180	~35
9	ZW-2.0/10-16	30	1400×900x1180	~45
10	ZW-2.5/10-16	37	1400×900×1180	~55
11	ZW-3.0/10-16	45	1400×900×1180	~65
12	ZW-4.0/10-16	55	1400×900x1180	~85
13	ZW-5.0/10-16	75	2000×1700×1400	~110
14	ZW-6.0/10-16	90	2000x1700x1400	~130
15	ZW-8.0/10-16	110	2000x1700x1400	~174
16	ZW-0.75/10-16	11	1450×800×1300	~16.3
17	ZW-1.5/10-16	22	1860×1680×930	~32.6

Inlet pressure:≤10MPa Discharge pressure:s16MPa

Differential pressure: 0.6MPa Instantaneous pressure ratio: ≤6 Cooling method: air-cooled

The unloading volume is calculated according to the feed pressure of 1.0MPa, discharge pressure of 1.6MPa, feed temperature of 40℃, and liquid density of liquefied gas of 582.5kg/m3, and it will be changed accordingly when the working brother changes.

The unloading volume will be changed accordingly, for reference only.

Compressor for loading and unloading of propylene

Serial No.	Model Number	Motor Power(kw)	Dimension(mm)	Loading and unloading (t/h)
1	ZW-0.6/16-24	11	1000x680x870	~15
2	ZW-0.8/16-24	15	1000×680×870	~20
3	ZW-1.0/16-24	18.5	1000×680×870	~25
4	ZW-1.5/16-24	30	1400×900×1180	~36
5	ZW-2.0/16-24	37	1400×900×1180	~50
6	ZW-2.5/16-24	45	1400×900x1180	~60
7	ZW-3.0/16-24	55	1600×1100×1250	~74
8	ZW-4.0/16-24	75	1600×1100×1250	~98
9	VW-6.0/16-24	132	2400x1700x1550	~147

Inlet pressure:≤10MPa Discharge pressure:s16MPa

Differential pressure: 0.6MPa Instantaneous pressure ratio: ≤6 Cooling method: air-cooled

The unloading volume is calculated according to the feed pressure of 1.0MPa, discharge pressure of 1.6MPa, feed temperature of 40℃, and liquid density of liquefied gas of 582.5kg/m3, and it will be changed accordingly when the working brother changes.

The unloading volume will be changed accordingly, for reference only.

LEQUID TRANSFER AND VAPOR RECOVERY PROCESS

The unloading compressor is a critical component in many industrial settings, especially in systems requiring efficient air compression. This type of compressor is designed to automatically adjust the pressure within a system by unloading when it reaches a specified pressure threshold, reducing energy consumption and improving overall system efficiency. Whether used in HVAC systems, refrigeration units, or heavy-duty manufacturing processes, an unloading compressor ensures the system operates smoothly, avoiding unnecessary strain on the compressor and minimizing wear and tear. With its ability to efficiently manage air compression cycles, the unloading compressor significantly enhances system reliability and performance.

One of the standout features of the unloading compressor is its ability to prevent overloads. By controlling the air pressure, it prevents the compressor from running continuously at full capacity, which not only saves energy but also extends the lifespan of the equipment. The unloading compressor is equipped with advanced control mechanisms that allow it to sense when air pressure is adequate and then unloads, reducing the load on the system. This function is especially beneficial in environments with fluctuating air demand, ensuring that the compressor operates at peak efficiency and does not waste energy.

In addition to its energy-saving benefits, the unloading compressor offers superior flexibility. It can be easily integrated into a wide range of systems, providing versatile performance across various industries. Whether in a small-scale operation or a large industrial plant, the unloading compressor adapts to different system requirements, ensuring optimal performance. It’s designed to work seamlessly with other components of the air compression system, enhancing the overall operational flow. Furthermore, its durability means that the unloading compressor can withstand harsh conditions, making it a reliable choice for even the most demanding industrial environments.

To summarize, the unloading compressor is an essential part of modern air compression systems, offering significant advantages in terms of energy efficiency, system reliability, and operational flexibility. By unloading when necessary, it ensures that compressors don’t run unnecessarily at full load, which reduces energy consumption and prolongs the life of the equipment. Whether you’re in the HVAC, refrigeration, or manufacturing industries, the unloading compressor is an invaluable tool that can optimize performance and reduce costs.

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