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6SD/6SG
DMZL
As a leading OEM manufacturer with over 30 years of experience in refrigeration technology, ZheJiang DaMing Refrigeration Technology Co., Ltd. specializes in semi-hermetic reciprocating compressors optimized for R22, R404A, R134A, and R507A refrigerants. Our products blend energy efficiency, durability, and compact design to address critical cooling needs across industries—from food preservation to manufacturing. Backed by a 50,000-square-meter modern factory, CNC machining centers, and an advanced testing center, we deliver reliable solutions that minimize downtime and lower operational costs.

Our semi-hermetic reciprocating compressors are not just components—they are integrated solutions designed to solve industry-specific cooling challenges.
For cold chain logistics, meat processing plants, and fruit/vegetable warehouses, temperature stability is non-negotiable. Our compressors (e.g., 6S251D, 6S351G) maintain consistent evaporating temperatures from -45℃ to 7.5℃, preventing spoilage and extending shelf life. With low power consumption (as low as 8.75kW at -35℃ evaporating temperature for 6S251D), they reduce energy costs while ensuring compliance with global food safety standards.
Supermarkets, catering facilities, and pharmaceutical cold rooms require compressors that handle variable cooling demands. Our wide product lineup (25HP to 50HP) ensures compatibility with small-scale walk-in freezers and large industrial cold rooms alike. The forced-lubrication system guarantees smooth operation even under fluctuating loads, making them ideal for 24/7 continuous use—critical for businesses that can’t afford cooling interruptions.
In electronics, plastic injection molding, and chemical production, precise temperature control protects expensive equipment and improves product quality. Our compressors (e.g., 6S401D, 6S501G) deliver stable cooling capacity (up to 184,400W for 6S501G at 30℃ condensing temperature) to cool machinery, preventing overheating and ensuring consistent production output. This reliability helps manufacturers reduce waste and meet tight production deadlines.
We prioritize long-term reliability in every design choice, using high-quality materials and advanced engineering to withstand harsh industrial environments.
• Forced-Lubrication System: Reduces friction between moving parts (e.g., crankshaft, cylinders) to extend component life and minimize maintenance frequency—critical for industries relying on non-stop operation.
• Crankcase Heater (220V, 140W): Prevents refrigerant condensation in the oil sump during shutdowns, avoiding oil dilution and potential compressor damage that could lead to costly repairs.
• Precision Machining: CNC-machined cylinders and valves (exhaust valve diameter up to Φ42mm, suction valve Φ54mm) ensure airtightness and efficient refrigerant compression, maintaining cooling performance over time.
• Compressor Body: Cast iron (Fe) construction provides excellent corrosion resistance and structural strength, making it suitable for high-pressure refrigeration cycles common in industrial settings.
• Valve Components: Wear-resistant alloy materials (e.g., stainless steel) withstand frequent opening/closing, reducing refrigerant leakage and preserving cooling efficiency even after years of use.
• Lubricants: Refrigerant-specific oils (compatible with R22, R404A, R134A, R507A) ensure optimal lubrication while avoiding chemical reactions that could degrade system performance.
We go beyond manufacturing to ensure your cooling system operates at peak performance throughout its entire lifecycle.
Our team of refrigeration experts provides personalized recommendations tailored to your project’s unique needs:
• Analyze cold room size, target temperature ranges, and refrigerant type to match you with the most efficient compressor model.
• Conduct cooling capacity simulations to validate performance before purchase, ensuring the solution aligns with your operational goals.
• Offer guidance on system integration, helping you avoid compatibility issues with existing refrigeration infrastructure.
• 24/7 Technical Hotline: Our engineers are available around the clock to troubleshoot issues, minimizing downtime for critical operations.
• Maintenance Services: Scheduled maintenance visits to inspect components (e.g., valves, lubrication systems) and optimize performance, extending the compressor’s service life.
• Spare Parts Supply: Fast access to genuine replacement parts (e.g., valves, crankcase heaters) from our inventory, ensuring quick repairs when needed.
• Training Programs: On-site or virtual training for your team to operate and maintain the compressors, reducing human error and improving safety.
With certifications including CE, CCC, and ISO9001, our semi-hermetic reciprocating compressors meet global quality standards—making them a trusted choice for businesses worldwide. Whether you need a solution for food storage, commercial cold rooms, or manufacturing, DaMing Refrigeration delivers reliability you can count on.
| Model | Nominal PowerHP/KW | Displacementm³/h @50Hz | Number ofCylinders×Diameter×Stoke | Exhaust & Suction Valve mm/IN | Oil Volume(L) | Power V/φ/Hz | Electrical Parameter | Crankcase Heater(220V)W | Oil Supply Method | Weight(Including Oil)Kg | ||
| DL Exhaust Valve | SL Suction Valve | Max Operating Current(A) | Starting/ Locked Current(A) | |||||||||
| 6S251D | 25/18.5 | 110.5 | 6×φ70×55 | Φ35 | Φ54 | 4.75 | 380-420/3/50 440-480/3/60 | 45 | 116/193 | 140 | Forced-lubrication | 224 |
| 6S351G | 35/25.5 | 110.5 | 6×φ70×55 | Φ42 | Φ54 | 4.75 | 61 | 147/262 | 140 | 235 | ||
| 6S321D | 30/22 | 126.8 | 6×φ75×55 | Φ42 | Φ54 | 4.75 | 53 | 135/220 | 140 | 228 | ||
| 6S401G | 40/30 | 126.8 | 6×φ75×55 | Φ42 | Φ54 | 4.75 | 78 | 180/323 | 140 | 238 | ||
| 6S401D | 40/30 | 151.6 | 6×φ82×55 | Φ42 | Φ54 | 4.75 | 78 | 180/323 | 140 | 239 | ||
| 6S501G | 50/37 | 151.6 | 6×φ82×55 | Φ42 | Φ54 | 4.75 | 92 | 226/404 | 140 | 241 | ||
Refrigerating Performance – Cooling Capacity with R404a/R507a
| Model | Condensing Temperature℃ | Cooling Capacity Qo(W) Power Consumption Pe(kW) | ||||||||||||
| Evaporating Temperature ℃ | ||||||||||||||
| 7.5 | 5 | 0 | -5 | -10 | -15 | -20 | -25 | -30 | -35 | -40 | -45 | |||
| 6S251D | 30 | Qo | 87900 | 72500 | 59300 | 47800 | 38000 | 29700 | 22650 | 16740 | 11850 | |||
| Pe | 23.50 | 22.15 | 20.58 | 18.83 | 16.94 | 14.95 | 12.89 | 10.81 | 8.75 | |||||
| 40 | Qo | 74700 | 61600 | 50200 | 40400 | 31900 | 24700 | 18590 | 13440 | 9130 | ||||
| Pe | 27.20 | 25.18 | 23.00 | 20.68 | 18.28 | 15.82 | 13.36 | 10.92 | 8.54 | |||||
| 50 | Qo | 50500 | 41150 | 33000 | 25950 | 19920 | 14760 | 10390 | ||||||
| Pe | 27.78 | 25.02 | 22.18 | 19.31 | 16.43 | 13.59 | 10.93 | |||||||
| 6S351G | 30 | Qo | 136000 | 124800 | 104500 | 86900 | 71600 | 58400 | 47000 | 37200 | 28800 | 21700 | 15720 | |
| Pe | 25.11 | 24.84 | 24.07 | 23.04 | 21.77 | 20.29 | 28.64 | 16.83 | 14.91 | 12.89 | 10.81 | |||
| 40 | Qo | 116300 | 106600 | 89300 | 74100 | 60900 | 49450 | 39600 | 31100 | 23800 | 17670 | 12480 | ||
| Pe | 29.81 | 29.20 | 27.79 | 26.14 | 24.30 | 22.29 | 20.14 | 17.88 | 15.53 | 13.13 | 10.71 | |||
| 50 | Qo | 96600 | 88600 | 74100 | 61400 | 50400 | 40700 | 32400 | 25250 | 19160 | 14000 | 9670 | ||
| Pe | 34.17 | 33.23 | 31.19 | 28.96 | 26.56 | 24.04 | 21.41 | 18.71 | 15.96 | 13.20 | 10.45 | |||
| 6S321D | 30 | Qo | 98300 | 81200 | 66400 | 53600 | 42700 | 33350 | 25400 | 18760 | 13210 | |||
| Pe | 26.77 | 2.507 | 23.21 | 21.20 | 19.08 | 16.84 | 14.54 | 12.17 | 9.76 | |||||
| 40 | Qo | 84000 | 69300 | 56600 | 45550 | 36050 | 27900 | 21000 | 15130 | 10210 | ||||
| Pe | 30.86 | 28.50 | 26.00 | 23.38 | 20.68 | 17.90 | 15.07 | 12.21 | 9.34 | |||||
| 50 | Qo | 57600 | 46900 | 37600 | 29550 | 22600 | 16720 | 11710 | ||||||
| Pe | 31.46 | 28.35 | 25.18 | 21.94 | 18.67 | 15.37 | 12.06 | |||||||
| 6S401G | 30 | Qo | 156100 | 143200 | 120000 | 99900 | 82500 | 67400 | 54300 | 43150 | 33600 | 25550 | 18730 | |
| Pe | 30.46 | 29.91 | 28.66 | 27.20 | 25.57 | 23.77 | 21.82 | 19.75 | 17.56 | 15.28 | 12.93 | |||
| 40 | Qo | 133400 | 122400 | 102700 | 85400 | 70300 | 57300 | 46000 | 36300 | 28000 | 20900 | 14940 | ||
| Pe | 35.49 | 34.61 | 32.70 | 30.62 | 28.38 | 26.02 | 23.54 | 20.96 | 18.30 | 15.57 | 12.80 | |||
| 50 | Qo | 110800 | 101800 | 85400 | 70900 | 58300 | 47350 | 37800 | 29550 | 22500 | 16450 | 11330 | ||
| Pe | 40.19 | 38.97 | 36.42 | 33.73 | 30.91 | 27.99 | 24.99 | 21.92 | 18.79 | 15.63 | 12.46 | |||
| 6S401D | 30 | Qo | 118800 | 98100 | 80100 | 64700 | 51400 | 40100 | 30500 | 22400 | 15600 | |||
| Pe | 31.46 | 29.74 | 27.69 | 25.37 | 22.84 | 20.14 | 17.34 | 14.49 | 11.63 | |||||
| 40 | Qo | 100900 | 83100 | 67600 | 54300 | 42800 | 32950 | 24600 | 17570 | 11680 | ||||
| Pe | 36.00 | 33.43 | 30.59 | 27.55 | 24.36 | 21.06 | 17.73 | 14.40 | 11.14 | |||||
| 50 | Qo | 68300 | 55300 | 44050 | 34300 | 26050 | 18990 | 13060 | ||||||
| Pe | 36.68 | 33.08 | 29.33 | 25.49 | 21.62 | 17.76 | 13.98 | |||||||
| 6S501G | 30 | Qo | 184400 | 169300 | 142200 | 118600 | 98100 | 80400 | 65200 | 52100 | 40900 | 31400 | 23450 | |
| Pe | 36.24 | 35.76 | 34.49 | 32.87 | 30.95 | 28.79 | 26.43 | 23.94 | 21.38 | 18.79 | 13.26 | |||
| 40 | Qo | 157900 | 145000 | 121700 | 101300 | 83600 | 68300 | 55000 | 43600 | 33850 | 25600 | 18620 | ||
| Pe | 43.13 | 42.10 | 39.80 | 37.22 | 34.43 | 31.47 | 28.40 | 25.28 | 22.15 | 19.09 | 16.14 | |||
| 50 | Qo | 131000 | 120200 | 100800 | 83800 | 68900 | 56000 | 44800 | 35150 | 26950 | 19960 | 14090 | ||
| Pe | 49.80 | 48.21 | 44.85 | 41.30 | 37.60 | 33.83 | 30.02 | 26.24 | 22.53 | 18.97 | 15.59 | |||
| Based on 20℃ suction gas temperature,50Hz,without liquid subcooling. | ||||||||||||||
| Additional cooling or limited suction gas temperature. | ||||||||||||||
| Additional cooling and CIC system. | ||||||||||||||
The compressors are optimized for R22, R404A, R134A, and R507A refrigerants, covering multiple industrial cooling needs.
The available models include 6S251D, 6S351G, 6S321D, 6S401G, 6S401D, and 6S501G, with nominal power ranging from 25HP to 50HP.
They are widely applied in three core fields:
• Food Storage & Preservation: Suitable for cold chain logistics, meat processing plants, and fruit/vegetable warehouses, maintaining evaporating temperatures from -45℃ to 7.5℃.
• Commercial Cold Rooms: Compatible with supermarkets, catering facilities, and pharmaceutical cold rooms, adapting to variable cooling loads for 24/7 continuous operation.
• Manufacturing Process Cooling: Used in electronics, plastic injection molding, and chemical production to cool machinery and ensure precise temperature control.