Lingxiazhu · Jindong · Jinhua
Vocke · refrigeration compressors and cold-storage engineering
Zhejiang Vocke Refrigeration Equipment Co., Ltd. (浙江沃克制冷设备有限公司) dates its establishment to 1997. It combines compressor research, design, manufacturing and sales with refrigeration engineering design and installation work.
The published range is semi-hermetic piston and semi-hermetic screw refrigeration compressors. Food processing/storage, pharmaceutical storage and refrigerated transport are the manufacturer's stated application fields.
For a cold-room project, begin with the refrigeration load and operating temperatures. For a replacement, begin with the full model, motor suffix and system interfaces.
V11 and V21 · single-stage screw
Read the full suffix before comparing the ratings
The maker's notation distinguishes K: single-stage high-temperature, N: single-stage low-temperature and a separate S: two-stage low-temperature route. The “21” family name does not mean two-stage compression.
V11 · 84/101 m³/h displacement at 50/60 Hz
| V11K84-30 | Max current: 52 A Max power: 33 kW Weight: 170 kg |
|---|---|
| V11N84-20 | Max current: 48 A Max power: 29 kW Weight: 166 kg |
V21 · 140/168 m³/h displacement at 50/60 Hz
| V21K140-50 | Max current: 79 A Max power: 50 kW Weight: 238 kg |
|---|---|
| V21N140-40 | Max current: 65 A Max power: 40 kW Weight: 234 kg |
VKXS4A · reciprocating route
Same envelope dimensions, different motor/application suffix
VKXS4A uses splash lubrication with manufacturer-described motor-temperature/oil-level protection. Its A bore code is 41 mm; S denotes a medium/low-temperature motor and H a medium/high-temperature motor.
| VKXS4A-3S | 437 × 296 × 364 mm 71 kg 3 HP motor notation |
|---|---|
| VKXS4A-5H | 437 × 296 × 364 mm 74 kg 5 HP motor notation |
| Suction / discharge | 22 mm (7/8 inch) 16 mm (5/8 inch) |
Envelope dimensions alone do not establish replacement compatibility. Check mounting positions, valves, motor, protection/control and refrigerant/oil. The HP suffix does not specify refrigeration capacity.
VKXS4A replacement and duty checklist →Manufacture, engineering and inspection
Connect the factory's design work to the delivered model
Vocke describes an independent R&D institution, a compressor-design team and a pre-sales engineering team. Its original equipment gallery includes coordinate-measurement work with a rotor and compressor casing.
For the order, request the offered model's dimensional checks, leak/pressure tests, performance conditions, protective-function verification and serial traceability. Agree any witness inspection and the records supplied at handover.
A machine photograph identifies equipment; it does not establish a particular tolerance or testing coverage. Request those details against the selected compressor and project.
Separate the compressor from the complete refrigeration system
Compressor selection
Exact suffix, refrigerant/oil, capacity/input at the selection point, envelope, electrical supply, valves/mounting and protection. Vocke lists motor/PTC discharge-temperature protection and an internal discharge check valve for its screw route.
System equipment
Specify condenser/evaporator, receiver, oil separation/return, controls, defrost and redundancy. The screw range describes an external-economizer route; determine its design, included components and selection assumptions in the quotation.
Engineering and handover
The company describes cold-storage design and site installation/commissioning guidance. Agree actual destination scope, site responsibilities, travel, language, startup procedures, service provider and parts arrangements.
Published refrigerant diagrams must be matched to the full model and operating point. Confirm the proposed refrigerant and oil against destination requirements and the current offer.
A brief the engineering team can select from
Send temperatures and load conditions with the enquiry
Cold-room duty
Room temperature, storage volume, product/throughput, entering product temperature, loading pattern and pull-down time; ambient, defrost and redundancy. Ask for the load calculation and selection point.
Refrigeration point
Refrigerant, load in kW, evaporating/condensing temperatures, superheat, subcooling, frequency and load profile. Agree cooling-capacity and input measurement conditions.
Replacement interfaces
Existing nameplate/model/serial, refrigerant/oil, dimensions and mounting, suction/discharge connections, motor/winding and starter/protection/controller information.
Supply and acceptance
Bare compressor, unit or system; included auxiliaries/controls, current drawings, tests and applicable model documents, commissioning scope and parts.
Vocke selection questions
Is V21 a two-stage compressor?
The current V21 record is in the single-stage screw category. K/N designate its high-/low-temperature single-stage models; the catalogue assigns S to a separate two-stage low-temperature route.
Does 140 m³/h mean a 140 kW refrigeration load?
No. It is V21's 50 Hz displacement entry. Refrigeration output depends on the exact model, refrigerant and selection conditions. Request cooling capacity and actual input at the proposed duty.
Can VKXS4A-3S be substituted for VKXS4A-5H because the dimensions match?
The table gives the same envelope but different motor/application suffix and weight. Review operating envelope, capacity, electrical/control and all mounting/valve interfaces before selecting a replacement.
Is the economizer supplied with every V11 or V21?
The manufacturer describes an external-economizer route. Agree the included hardware, system design, controls and performance assumptions; a connection provision alone does not define the supplied package.