Product Overview: DW Series Refrigerant Compressors
The DW series refrigerant compressor is a two-column horizontal opposed-balance reciprocating piston compressor for large-scale industrial refrigeration applications using ammonia (NH₃ / R717), propylene (R1270), propane (R290), and subcritical CO₂. It covers 25–260 m³/min of refrigerant gas flow at 0.80–1.20 MPa discharge in 11 standard models from 90 to 1,600 kW, serving cold storage plants, food processing facilities, brewery refrigeration systems, petrochemical refrigeration, and chemical plant process cooling across Russia and the CIS.
The opposed-balance two-column frame is the engineering characteristic that distinguishes the DW from simpler L-type and single-column refrigerant compressors at comparable power levels. Refrigerant systems — particularly large NH₃ cold storage installations — operate continuously for 20–30 years with the compressor connected by rigid insulated pipework to condensers and evaporators bolted to the building structure. In this configuration, sustained vibration from a non-balanced compressor at 250–1,600 kW transmits directly to pipe joints, expansion valve connections, and evaporator tube sheets, progressively fatiguing threaded connections and gasket faces. The DW frame cancels the primary alternating inertia force that causes this vibration at source, reducing dynamic loading on the refrigerant circuit to a small fraction of the unbalanced equivalent and extending maintenance-free service intervals from years to decades in long-service cold storage installations.
Ammonia (NH₃) is the primary design refrigerant for the DW series — it is the dominant industrial refrigerant in Russia and CIS cold storage and food processing, preferred for its high thermodynamic efficiency, zero ozone depletion potential, zero global warming potential, and low cost relative to synthetic fluorinated refrigerants. The DW series uses ammonia-compatible materials throughout: grey cast iron cylinders, steel crankcase, carbon steel refrigerant pipework connections, and ammonia-rated shaft sealing. Propylene and propane variants share the same frame with adjusted cylinder bore and valve sizing for the different molecular weight and vapour pressure of these hydrocarbon refrigerants. All models are GOST-R certified and manufactured at our production facility in Russia.
Technical Specifications — Standard Refrigeration Range (0.80 MPa Discharge)
Two-column two-stage and four-column configurations for cold storage refrigeration, food processing cooling, and industrial process refrigeration at −25°C to −5°C evaporating temperature with NH₃ or propylene. Discharge pressure 0.80 MPa corresponds to NH₃ condensing temperature of approximately +30°C.
| Model |
Config |
Flow (m³/min) |
Discharge (MPa) |
Dimensions L×W×H (mm) |
Weight (t) |
Power (kW) |
Voltage |
| DW-60/8 |
2-col 2-stage |
60 |
0.80 |
5000×1800×1450 |
6.00 |
350 |
6K/10K |
| DW-75/8 |
2-col 2-stage |
75 |
0.80 |
5456×3518×2535 |
13.00 |
450 |
6K/10K |
| DW-85/8 |
2-col 2-stage |
85 |
0.80 |
5456×3518×2535 |
13.00 |
500 |
6K/10K |
| DW-100/8 |
2-col 2-stage |
100 |
0.80 |
5456×3518×2535 |
13.00 |
600 |
6K/10K |
| DW-120/8 |
2-col 2-stage |
120 |
0.80 |
5800×3518×2535 |
15.00 |
710 |
6K/10K |
| DW-130/8 |
2-col 2-stage |
130 |
0.80 |
6000×3640×3000 |
18.00 |
800 |
6K/10K |
| DW-150/8 |
2-col 2-stage |
150 |
0.80 |
6000×3640×3000 |
19.00 |
900 |
6K/10K |
| DW-200/8 |
4-col 2-stage |
200 |
0.80 |
5456×6000×2535 |
26.00 |
1,200 |
6K/10K |
| DW-260/8 |
4-col 2-stage |
260 |
0.80 |
6000×6000×3000 |
35.00 |
1,600 |
6K/10K |
0.80 MPa discharge corresponds to NH₃ condensing temperature approximately +30°C. Flow rated at suction conditions. 4-col variants (DW-200/8, DW-260/8) use a four-column frame for higher flow. All dimensions L×W×H in mm.
Technical Specifications — Small-to-Medium Range (0.80–1.20 MPa)
Smaller opposed-balance models for medium-scale cold storage, brewery refrigeration, and process cooling. 380 V models cover direct installation on standard Russian three-phase supply.
| Model |
Config |
Flow (m³/min) |
Discharge (MPa) |
Dimensions L×W×H (mm) |
Weight (t) |
Power (kW) |
Voltage |
| DW-20/8 |
2-col 2-stage |
20 |
0.80 |
4000×1700×1800 |
5.00 |
90 |
380 |
| DW-25/12 |
2-col 2-stage |
25 |
1.20 |
4000×1700×1800 |
4.50 |
90 |
380 |
| DW-40/12 |
2-col 2-stage |
40 |
1.20 |
4500×1700×2100 |
6.50 |
160 |
380/6K/10K |
DW-20/8 and DW-25/12 at 380 V for direct connection to standard Russian industrial supply. DW-25/12 and DW-40/12: 1.20 MPa discharge suits NH₃ condensing at higher ambient temperatures (+40°C to +45°C) or higher-pressure propylene service. All dimensions L×W×H in mm.
General Series Parameters
| Parameter |
DW Series Refrigerant Compressor |
| Refrigerant Media |
NH₃ (ammonia / R717); propylene (R1270); propane (R290); subcritical CO₂ |
| Discharge Pressure |
0.80–1.20 MPa (8–12 bar) |
| Refrigerant Gas Flow |
20–260 m³/min at suction conditions |
| Motor Power |
90–1,600 kW |
| Drive Voltage |
380 V (small models); 6 kV or 10 kV (larger models above 350 kW) |
| Frame Configuration |
2-column or 4-column horizontal opposed-balance; 2-stage compression |
| Dynamic Balance |
Primary inertia force cancelled — opposed-balance standard on all models |
| Lubrication |
Oil-lubricated (ammonia-compatible mineral oil); separate oil pump and filter |
| Capacity Control |
Suction valve unloading (step-wise 25%–50%–75%–100%) standard; VFD option |
| Cooling |
Water-cooled intercoolers and interstage oil cooler; liquid refrigerant injection option |
| Design Standard |
GB/T 10079 (reciprocating refrigerant compressors); GOST-R (Russia / CIS) |
| Certification |
ISO 9001:2015, GOST-R, Pressure Vessel License |
Working Principle: Opposed-Balance Refrigeration Compression
The DW series operates on the two-stage opposed-balance reciprocating compression principle. Refrigerant gas — typically NH₃ vapour from the evaporators — enters the first-stage cylinder at suction pressure (typically 0.07–0.35 MPa for NH₃ at −40°C to −5°C evaporating temperature), is compressed to an intermediate pressure (typically 0.30–0.55 MPa), cooled in a water-cooled intercooler that also condenses and returns any liquid refrigerant carried over from the evaporators, and then enters the second stage for compression to final discharge pressure (0.80–1.20 MPa). The two-stage cycle is required for large temperature lifts — compressing NH₃ directly from −35°C evaporation (0.096 MPa) to +40°C condensation (1.55 MPa) in a single stage would produce excessively high discharge temperatures and poor volumetric efficiency.
The opposed-balance crankshaft arrangement positions the two cylinder columns at 180 degrees to each other, so their pistons move in opposing directions simultaneously. The inertia forces generated by one piston at any point in the stroke are cancelled by the equal and opposite inertia force from the opposing piston at the same crank angle. The net primary force transmitted to the frame, foundation, and connected pipework is near zero throughout the operating cycle. In a large NH₃ cold storage installation where the compressor pipework is rigidly connected to the building structure and the evaporator coils through dozens of pipe hangers and supports, this near-zero dynamic force is the difference between a refrigerant pipework system that requires hanger inspection every 2–3 years and one that runs maintenance-free for 10–15 years between structural inspections.
Two-Stage NH₃ Compression
First-stage cylinder compresses suction gas to intermediate pressure; intercooler removes heat of compression and carries condensate back to the flash vessel; second-stage cylinder compresses to condensing pressure. Two-stage operation reduces discharge temperature at the second-stage outlet to below 120°C, preventing mineral oil carbonisation.
Opposed-Balance Crankshaft
Forged 42CrMo crankshaft with two opposed crank throws. Primary inertia force from the pistons, connecting rods, and crossheads is cancelled by the opposing motion of the second column. Net alternating force to the foundation and pipework is near zero at all crank angles.
NH₃-Compatible Materials
Grey cast iron cylinders, forged steel crankshaft and connecting rods, carbon steel refrigerant pipework connections. No copper, copper alloys, or zinc in any NH₃-wetted component — these metals are corroded by ammonia and produce contamination that accelerates valve wear and blocks oil separators.
Step-Wise Suction Valve Unloading
Suction valve unloaders on each cylinder position allow step-wise capacity reduction to 75%, 50%, or 25% of rated flow without stopping the motor. Essential for cold storage systems where refrigeration demand varies with ambient temperature, door openings, and product loading cycles.
Application Scenarios
❄Large Cold Storage and Food Freezing — NH₃ Refrigeration
Cold storage facilities with 10,000–100,000 m³ of refrigerated volume require compressor capacity from 350 to 1,600 kW to maintain −18°C to −25°C in frozen food stores and 0°C to +4°C in chilled product stores. The DW-85/8 through DW-260/8 cover this capacity range in single-machine configurations with NH₃ as the primary refrigerant. NH₃ is the preferred refrigerant for Russian cold storage due to its low cost (approximately 10 times lower per kilogram than HFC refrigerants), zero GWP, high thermodynamic efficiency (highest coefficient of performance of any common refrigerant at these temperature conditions), and established service network in Russia. The opposed-balance DW frame is preferred over single-column alternatives at this power range for the low-vibration pipework benefit described above.
🍾Food Processing — Blast Freezing, Ice Cream, Fish Processing
Blast freezing of meat, fish, and prepared food requires high-capacity refrigeration at −35°C to −40°C evaporating temperature — lower than conventional cold storage and at a point where two-stage NH₃ compression is essential. The DW-60/8, DW-75/8, and DW-85/8 are commonly specified for medium-scale blast freezing tunnels and spiral freezers. Ice cream and dairy processing plants require precise temperature control between −5°C and −30°C — the step-wise capacity control of the DW suction valve unloading system allows the compressor to match exactly the variable cooling duty as product throughput changes across the production shift. Russian fish processing plants in the Far East and Arctic coastal facilities account for a significant share of DW refrigerant compressor installations in CIS territory.
⚙️Petrochemical Refrigeration — Propylene and Propane Separation
Ethylene and propylene separation in petrochemical complexes uses propylene refrigeration at −20°C to −45°C to condense propylene product from the fractionation column overhead. Propylene as both the process product and the refrigerant means the DW refrigerant compressor is handling a flammable gas — the opposed-balance low-vibration characteristic is therefore important not only for mechanical longevity but for safety: reduced dynamic loading at flanged refrigerant line connections reduces the leak probability in a flammable gas service. Russian petrochemical complexes at Tobolsk, Salavat, and Novokuibyshevsk have operated DW-series refrigerant compressors in propylene service for multiple decades.
🍺Brewery and Beverage Refrigeration
Brewery fermentation requires precise glycol or NH₃ refrigeration at −2°C to −5°C for lagering and −8°C to −15°C for fermentation temperature control. Large Russian and CIS breweries producing above 5 million litres per year require DW-20/8 to DW-60/8 compressor capacity. NH₃ refrigeration is preferred in breweries over HFC systems on the grounds of energy efficiency (the NH₃ thermodynamic advantage at these relatively moderate temperature differences over ambient is approximately 15–20% better COP than R404A systems), and it allows the brewery to operate without the fluorinated gas quotas and phase-down constraints that are becoming progressively more restrictive for HFC refrigerants in Russia and EEU.
Core Advantages
⚖
Opposed-Balance — 20–30 Year Pipework Service Life
Primary force cancellation reduces dynamic loading on NH₃ refrigerant pipework, flanged connections, and expansion valves. Cold storage installations where the compressor operates continuously for 25–30 years benefit disproportionately from this reduced vibration: a single pipe joint fatigue failure in an NH₃ system requires emergency shutdown, refrigerant recovery, and building ventilation before repair.
🌀
NH₃ — Zero GWP, Lowest Running Cost
Ammonia (R717) has zero global warming potential and zero ozone depletion potential. Refrigerant cost for a 500 kW NH₃ system is approximately one-tenth of an equivalent HFC system. No fluorinated gas quotas, no phase-down timeline concerns, no refrigerant supply disruption risk. NH₃ system energy efficiency (COP) at cold storage temperatures exceeds HFC alternatives by 10–20% in well-maintained systems.
📈
Step-Wise Capacity Control — 25% to 100%
Suction valve unloaders on each cylinder column provide four-step capacity control: 100%, 75%, 50%, and 25% of rated flow without motor shutdown. Cold storage systems with variable load profiles — product loading during the day, steady-state overnight, reduced load during weekend — operate the compressor at the correct capacity step for each period, saving energy compared to on-off cycling at full load.
📄
GOST-R and Pressure Vessel Certification
GOST-R certificate, technical passport, and pressure vessel certification for all interstage vessels, the oil separator, and the liquid refrigerant receiver — provided as standard for every DW refrigerant compressor delivered to Russia and EEU member states. All documentation in Russian. No import certification delays.
🌎
Russia-Based Spare Parts Supply
Gas valve elements, piston rings, piston rod packing, and shaft seal assemblies for all DW refrigerant models stocked in-house at our Russian facility. Dispatch within 24–72 hours. For cold storage facilities serving food supply chains, a compressor outage in summer has direct food safety consequences — local spare parts availability is a genuine operational requirement, not a preference.
🕑
3–6 Month Delivery
Standard delivery from confirmed purchase order is 3–6 months for DW refrigerant compressor models — faster than equivalent imported machines and without foreign currency exposure. For cold storage construction projects with a fixed commissioning date tied to the food supply season, confirmed domestic delivery is a practical project management advantage.
Material Specifications for NH₃ and Refrigerant Service
| Component |
NH₃ Service Specification |
Propylene / CO₂ Notes |
| Cylinders |
HT250 grey cast iron; no copper, zinc, or copper alloys |
Same; carbon steel option for high-pressure CO₂ |
| Piston Rings |
Cast iron or PTFE (oil-lubricated service); ammonia-compatible |
Material confirmed for each refrigerant |
| Piston Rods |
42CrMo; hard chrome plated; no copper-alloy guide rings |
Same |
| Gas Valves |
Carbon steel or stainless steel body; no brass seats or copper-alloy discs |
Stainless steel for CO₂ |
| Shaft Seal |
Carbon-face mechanical seal; ammonia-rated elastomers |
Elastomers confirmed per refrigerant |
| Refrigerant Connections |
Carbon steel flange connections — no copper tubing or fittings |
Same |
| Lubricating Oil |
NH₃-compatible refrigeration mineral oil (e.g. HL-NH3 grade); oil separator and return standard |
Grade selected per refrigerant and operating temperature |
DW vs. Alternative Refrigerant Compressor Types
Transparency Notice: Grasso, Mycom, and Howden are referenced for product category comparison only. We do not manufacture or claim affiliation with these brands. All DW refrigerant compressors are original designs. We do not sell counterfeit or unlicensed products.
| Factor |
DW Reciprocating |
Screw Refrigerant
(Howden / Grasso) |
Large Reciprocating
(Mycom) |
| NH₃ efficiency (COP) |
Best at >5:1 ratio |
Good; slightly lower |
Equivalent |
| Opposed-balance |
✓ Standard |
N/A (rotary) |
Some models |
| Capital cost |
30–45% below import |
Medium-high |
Very high (JPY) |
| GOST-R standard |
✓ Included |
Case by case |
Case by case |
| Lead time |
3–6 months |
8–14 months |
12–18 months |
| Russia spare parts |
In-house; 24–72 h |
Import; weeks |
Import; weeks |
| Propylene / petrochem |
✓ Standard variant |
Available |
Available |
Factory run test — every DW series refrigerant compressor is operated at rated suction and discharge conditions, vibration levels measured at the main bearing housings confirming opposed-balance performance, and suction valve unloader response tested at all load steps before shipment from our Russian facility
Frequently Asked Questions — DW Series Refrigerant Compressors
Q1: Why is NH₃ (ammonia) preferred for large industrial refrigeration in Russia?
NH₃ (ammonia, R717) has been the dominant industrial refrigerant in Russia for over 80 years and remains so for several practical reasons. Its thermodynamic efficiency (coefficient of performance) at cold storage temperatures of −15°C to −35°C is approximately 10–20% better than HFC refrigerants such as R404A or R507 at the same conditions. Its refrigerant cost is around one-tenth of HFC refrigerants per kilogram, and because systems require less refrigerant mass per kilowatt of cooling than HFC systems, the cost advantage is further amplified. NH₃ has zero global warming potential — it contributes nothing to climate change when released — and zero ozone depletion potential. It is readily detectable at very low concentrations (around 5 ppm) by the human nose, and the standard GOST-R safety protocols for NH₃ machine rooms (ventilation, gas detectors, emergency shower, SCBA equipment) are well established in Russian cold chain facilities. These practical, cost, and regulatory advantages make NH₃ the natural choice for large Russian cold storage and food processing refrigeration, and the DW series is designed primarily around NH₃ service.
Q2: Why does the opposed-balance frame matter specifically for cold storage installations?
Cold storage installations are characterised by continuous operation (24 hours per day, 350+ days per year) and long service life expectations (25–40 years for the building structure and refrigeration system). The compressor is connected by rigid insulated steel pipework to the condensers and evaporators, which are in turn bolted to the building structure. In this configuration, any sustained vibration from the compressor transmits directly into the pipework and structure rather than being absorbed by flexible connections. Over decades of continuous operation, even small alternating forces at flange gaskets, threaded pipe connections, and expansion valve bodies advance fatigue failure. The opposed-balance DW frame cancels the primary alternating inertia force at source — the dynamic force at the machine feet is near zero, and nothing is transmitted to the pipework beyond the normal operating pressure pulsation that is inherent to any reciprocating machine and is managed by pulsation dampeners on the suction and discharge lines. This is the engineering reason that large Russian cold storage projects specify opposed-balance refrigerant compressors rather than single-column or non-balanced alternatives.
Q3: What is two-stage NH₃ compression and when is it required?
Two-stage compression is required when the overall compression ratio — the ratio of discharge pressure to suction pressure — exceeds approximately 6–8:1. For NH₃ at an evaporating temperature of −35°C (suction pressure 0.096 MPa) and condensing temperature of +40°C (discharge pressure 1.555 MPa), the compression ratio is 16:1 — far above the single-stage limit. Single-stage compression at this ratio would produce a discharge temperature of approximately 200–250°C, which carbonises the mineral lubricating oil, degrades the gas valve elements, and overheats the piston rings within hours of operation. Two-stage compression breaks this ratio into two steps of approximately 4:1 each, with the intermediate-pressure gas cooled in a water-cooled intercooler between the stages. The two-stage DW compressor handles evaporating temperatures from −5°C down to −40°C with discharge temperatures kept below 120°C at the second-stage outlet, within the safe operating envelope for the refrigerant, oil, and valve materials.
Q4: Can the DW refrigerant compressor handle propylene or propane in petrochemical service?
Yes. The DW frame is used for propylene (R1270) refrigeration in ethylene and propylene production plants and for propane (R290) refrigeration in LPG fractionation and small-scale LNG facilities. The cylinder bore and stroke are adjusted for the different molecular weight and vapour density of the hydrocarbon refrigerant compared to NH₃ — propylene at 42 g/mol and propane at 44 g/mol are approximately 2.5 times denser than NH₃ at 17 g/mol, so the cylinder swept volumes are smaller for the same pressure ratio. The opposed-balance frame is particularly important for hydrocarbon refrigerant service because propylene and propane are flammable — the low-vibration characteristic reduces the probability of a refrigerant leak at any flanged connection or valve body in the refrigerant circuit. Provide the refrigerant type, operating pressure range, and site classification (whether the installation is in an ATEX-classified area) at enquiry; the cylinder specification and shaft seal design are confirmed for the specific refrigerant in the technical proposal.
Q5: How does the step-wise capacity control work in practice?
In a DW refrigerant compressor with four cylinder positions (two per column), each cylinder position has its own suction valve unloader — a small actuator that holds the suction valve open during the suction and compression stroke. When all four unloaders are de-energised (normal operating state), all four cylinders are active and the machine operates at 100% capacity. When one cylinder unloader is energised, that cylinder compresses no refrigerant and the machine operates at 75% capacity. With two cylinders unloaded — one from each opposed pair to maintain balance — the machine operates at 50%. With three cylinders unloaded, output is 25%. Transitions between load steps take approximately 2–3 crankshaft revolutions — less than one second at rated speed. The PLC-based control system selects the load step automatically based on the suction pressure or cold store temperature setpoint, with configurable deadband settings to prevent rapid step-switching when the refrigeration load is close to a step threshold.
Q6: What maintenance schedule does the DW refrigerant compressor require?
Annual maintenance covers: crankcase oil change and oil filter element replacement (every 2,000–3,000 hours or annually); gas valve inspection and element replacement at 8,000–12,000 hours (determined by inspection); piston ring inspection at 6,000–8,000 hours and replacement if wear exceeds limit; shaft seal inspection and replacement at 8,000–10,000 hours; suction valve unloader actuator function test and solenoid valve service; and refrigerant oil separator coalescing element replacement. For cold storage installations, shutdown for maintenance is planned during cooler weather periods when the refrigeration load is lowest — typically late autumn or spring in Russian cold climates. The DW opposed-balance design has inherently low bearing loads because the primary inertia force is internally cancelled — main bearing and crankshaft journal wear rates are lower than comparable single-column machines, extending the time between major overhauls.
Q7: What GOST-R documentation is provided for DW refrigerant compressors delivered to Russia?
Every DW refrigerant compressor delivered to Russia or EEU member states is supplied with: GOST-R certificate of conformity for the compressor unit, technical passport documenting all rated operating conditions (suction and discharge pressure, refrigerant flow, motor power, refrigerant type), pressure vessel certification for the interstage cooler and liquid refrigerant separator (required under Russian pressure vessel regulations for vessels operating above 0.07 MPa with a hazardous refrigerant), factory run test report confirming two-stage performance and vibration levels at rated conditions, and Russian-language operating and maintenance instructions covering startup, normal operation, shutdown, and maintenance procedures. NH₃ refrigeration systems in Russia are subject to Rostechnadzor registration as hazardous production facilities due to the toxicity of ammonia. The documentation package is structured to support this registration. Dispatch 2–3 weeks before machine shipment.
Q8: What spare parts should be stocked on-site for a DW-100/8 or DW-130/8 cold storage compressor?
The recommended two-year on-site stock for a DW-100/8 or DW-130/8 includes: one complete set of piston rings for all four cylinder positions (first-stage bore and second-stage bore); one complete set of gas valve elements for all eight valve positions (suction and discharge at each of four cylinders); one set of shaft seal face components; crankcase oil for one complete oil change (approximately 20–30 litres); oil filter elements for two changes; suction valve unloader actuator seals and solenoid valves; and a set of pressure gauge and thermometer sensing elements for the instrumentation panel. For a cold storage facility serving a food supply chain, the gas valve elements are the highest-priority stock item — a valve failure causes a rapid loss of compression efficiency on that cylinder, raising suction temperature and reducing cooling capacity, and replacement takes 1–3 hours. All parts are available from our Russian facility within 24–72 hours of order.
Q9: How is the DW refrigerant compressor different from the DW gas compressor at the same model number?
The frame, crankshaft, and connecting rod assembly are shared. The differences are in every gas-contacting component. The refrigerant DW has cylinder bores sized for the refrigerant vapour density at the specific suction condition — NH₃ vapour at −25°C and 0.20 MPa has a density of approximately 1.6 kg/m³, while natural gas at the same pressure and temperature is approximately 1.4 kg/m³, so the bore sizes differ by roughly 7–10%. The gas valves use different lift heights and spring rates for refrigerant service. The shaft seal uses ammonia-rated elastomers rather than standard nitrile. The crankcase oil is NH₃-compatible refrigeration-grade mineral oil rather than general-purpose machine oil. The refrigerant compressor cylinders have no copper-alloy material anywhere in contact with the refrigerant. And the suction valve unloaders are designed for the refrigerant service pressure range rather than the gas compressor pressure range. A standard gas DW compressor cannot be converted to refrigerant service without replacing all cylinders, valves, shaft seal, and instrumentation.
Q10: What is the delivery time and what information is needed to prepare a proposal?
Standard delivery from confirmed purchase order is 3–6 months for DW refrigerant compressor models — faster than comparable imported machines. To prepare a technical and commercial proposal, provide: the refrigerant type (NH₃, propylene, propane, or CO₂); the required evaporating temperature or suction pressure; the required condensing temperature or discharge pressure; the required refrigeration capacity in kW of cooling (not just compressor power); the available electrical supply voltage; whether the installation requires Rostechnadzor registration (for NH₃ systems above the exemption threshold, registration is mandatory under Russian Federal Law 116-FZ); and the required delivery date. If the refrigeration capacity in kW is not known but the cold store volume and target temperature are, our engineering team can calculate the approximate required compressor size. Response within 48 hours of complete enquiry submission.
Request a Technical Proposal
Our engineering team supplies DW series refrigerant compressors to cold storage developers, food processing companies, petrochemical plants, and breweries across Russia and the CIS. Opposed-balance frame for long-service pipework reliability, NH₃ and propylene compatible materials, GOST-R and Rostechnadzor documentation included. Spare parts manufactured in Russia and dispatched within 24–72 hours.
DW Refrigerant Compressor — Engineering Enquiry
Discuss Your Cold Storage or Industrial Refrigeration Project
Refrigeration engineers respond to all enquiries. GOST-R and Rostechnadzor documentation included. Response within 48 hours.
Request a Technical Quote
Include in Your Enquiry
✓ Refrigerant type (NH₃ / propylene / other)
✓ Required cooling capacity (kW) or cold store volume (m³)
✓ Evaporating temperature (°C) or suction pressure (MPa)
✓ Condensing temperature (°C) or discharge pressure (MPa)
✓ Available voltage (380V / 6kV / 10kV)
✓ Site location and ambient temperature range
✓ GOST-R / Rostechnadzor requirement
✓ Required delivery date
