• GVY75AA GVY75AA GVY75AA GVY75AA GVY75AA GVY75AA GVY75AA
    GVY75AA

 GVY75AA

    - Optimized efficiency.
    - Refrigerant Type: R134a  
    - Cooling Capacity: 205W.

​For quotation please contact : "' nadhvi@waltonbd.com '" 
Mobile/ WhatsApp/ Imo/ Viber/ Line: +8801678861146
Phone: +8801678861146; +8801794399957
WeChat: Nadhvi_2400
    
 For more details please

 
 General Features
 Type  Hermetic reciprocating compressor
 Refrigerant  R-134a
 Nominal voltage and frequency  220 / 50 [ V / Hz ]
 Application type  Low Back Pressure (LBP)
 Condensing temperature  55 [°C]
 Evaporating temperature  -23.3 [°C]
 Ambient temperature  32 [°C]
 Maximum winding temperature  130 [°C]
 Expansion device  Capillary tube
 Compressor cooling  Static
 Normal Performance
 Test standard  ASHRAE/ ISO/ IEC
 Noise dB (A)  36
 Cooling Capacity (W)  With Capacitor: 205
​ Without Capacitor: 205
 Power consumption (W)  With Capacitor: 144
​ Without Capacitor:154
 COP (W/W)  With Capacitor: 1.42
​ Without Capacitor: 1.33
 Rated Current (A)  With Capacitor: 0.83
​ Without Capacitor: 1.19
 Mechanical Data
 Displacement volume  7.52 [cm³]
 Net weight  8.6 [kg]
 Oil type  Ester
 Oil charge  180[cc]
 Oil viscosity  15 [@ 400C] [cSt]
 Suction muffler  Semi Direct
 Length, L  184.5 [mm]
 Width, W  150 [mm]
 Height, H  169.5 [mm]


Metrology Lab:
Height gauge: Accuracy- (1.1+0.6L/600) µm.
Vision measuring system: Accuracy- (1.9+L/100)
 µm,1D and (2.9+L/100) µm.
CNC CMM: Accuracy- (1.8+L/300) µm.
Surface roughness and Contour machine: Accuracy- Roughness 0.25 µm and Contour 0.50 µm.
Roundness machine: Accuracy 0.25 µm.

 

Materials Testing and Analysis Lab:
 Wire Testing Facilities
 Hardness Testing Facilities
 Macro and Micro Analysis facilities
 Spring Testing Facilities
 Gasket Thickness Measurement Machine

And also contains versatile testing machines for checking different raw materials characteristics

 

Performance Test Lab: 
 Calorimeter: Accuracy – 0.5% Repeatability
 Overload Test Machine
 Quick Test Machine
 Locked Rotor Test Machine
 OLP Test Machine

 

Noise Testing Chamber:
 Testing facilities for the measurement of Noise, Vibration and Gas pulsation
 Background Noise Level < 10dB
 Standard : ISO 3744

 

Life Testing Machine:
 28 benches are dedicated to perform Wear, High Temperature and ON/OFF Test
 Standard: CECOMAF GT4

 

 

"We are extremely confident on best quality, so everything remains exposed."
 

 


 
Piston
Piston is a crucial part of reciprocating compressor. The Piston of our Compressor is made of Sintered Iron. Its main purpose is to transfer the highly compressed superheated refrigerator into the compressor discharge line through discharge valve at high pressure. Our piston is very modern and very low frictional in design, robust in construction. Its leak proof capability is up to 25 bar.
 
Property:
  • Tensile strength (R): >140N/mm²
  • Breaking elongation (A): >1% sintered
  • Hardness: HRB 50-90, according DIN EN ISO 4498
  • Leakage: tight against pressure till 25bar
  • Roughness: Indication of surface texture DIN ISO 1302
  • Material:  Sinter Iron: C<0.4%, S<0.3%, MnS <0.5%, others<1.5%, rest Fe
  • Water steam treated, layer thickness 2-8 μm
  • Smooth, clean, no cracks, no cavities, no spots (dark blue), no rust, not oiled.
  • Water steam treated, low friction and light weight design with high lubricity.
  • Roughness and Cylindricity maintained up to 2.0µm, roundness is about 1.6 µm, and maximum precision level maintained about 1.50µm.
 
Connecting Rod
In a reciprocating compressor Connecting Rod transfers rotary motion from crankshaft as a reciprocating motion to piston. The connecting rod of our compressor is made of Sintered Iron. It can withstand force up to 240 MPa. Its damping capability is also very good.
 
Property:
  • Minimum breaking load between both eyes 1550N to 2450N
  • Resistance to tension: min. 240 N/mm²,
  • Breaking Elongation: min 1%
  • Hardness: HRB 40-75, according DIN EN ISO 4498
  • Material: Sinter Iron; C = 0.3-0.6%, Cu = 2.5-3.5%, Mn < 0.08%, S=0.3-0.5%, others < 0.5%, Fe = rest
  • Sinter Density: 6.8 ±0.2 g/cm³
  • Water steam treated, low friction and light weight design with high lubricity.
  • Roughness and Cylindricity maintained up to 3.5µm, roundness is about 2.50 µm, and maximum precision level maintained about 0.7µm.
 
Crankcase
Crankcase is the heavy, rugged part that has integrated cylinder block and four inch discharge line, especially designed to dampen the pressure fluctuation of the discharged gas. It works as the base on which all the rotating parts; valve group and cylinder head are mounted. This is casted from Grey cast iron undergoing special heat treatment to improve its machining process.
 
Property:
  • Material before annealing: Grey cast iron EN-GJL-200 according DIN EN 1561
  • Annealing process is to change the structure from essentially pearlitic one to essentially ferritic one with effect of change of mechanical properties
  • Casting microstructure according EN ISO 945 shall be essentially ferritic
  • Mechanical properties after annealing: Hardness measured on component: 135-185HB 5/750
  • Surface: Sand blasted, no sharp casting burr, No burr of parting line shifting and gating, smooth, clean, no cracks, no cavities, no pores, no blisters, free of scale and loose particles (like molding sand), oiled for rust protection.
  • Highly robust and specially designed for controlling noise and high volumetric efficiency.
 
Crankshaft
Crankshaft performs a conversion between reciprocating motion and rotational motion. It converts the rotational motion from the Rotor into the reciprocating motion of the Piston through connecting rod. It’s a robust part casted from Grey cast iron having integrated oil pump and long main bearing.
 
Property:
  • Structure of material EN-GJL-250 according EN ISO 945, Min. 60% of graphite.
  • Casting microstructure shall be essentially pearlitic with max. 10% of ferrite.
  • Mechanical Properties: Hardness of material EN-GJL-250: 230-260HB 5/750
  • Optimum design for reduced vibration with integrated oil pump.
 
Cylinder head
In a hermetic compressor the cylinder head (often informally abbreviated to just head) sits above the cylinders on top of the cylinder block. It closes in the top of the cylinder, forming the pressure chamber. This joint is sealed by a head gasket. In most compressors, the head also provides space for the passages that feed gas to the cylinder, and that allow the pressurized gas to escape.

​It forms the pressure chamber that creates spaces for passages of the feed gas to the cylinder, and that allow the pressurized gas to escape.

 
Property:
  • Material before annealing: Grey cast iron EN-GJL-200 according DIN EN 1561
  • Casting microstructure according ÖN EN ISO 945 shall be essentially ferritic
  • Mechanical properties after annealing: Hardness measured on component: 135 - 185 HB 5/750.
  • Specially designed to reducing pressure pulsation
 
Flange Bearing
Bearings with a flange on the outer ring are known as flange bearing. The housing for such bearings consist of a through-hole of uniform diameter, but the entry face of the housing (which may be either the outer or inner face) must be machined truly normal to the hole axis. However such flanges are very expensive to manufacture.
 
Property:
  • Material: Cast iron EN-GJL-200 according DIN EN 1561. Casting microstructure according EN ISO 945 shall be essentially pearlitic, under eutectical, max 0.5% phosphorus.
  • Mechanical properties: Hardness 180 - 250 HB 5/750
  • Surface: Sand blasted, no sharp casting burrs allowed, burr of parting line shifting and gating removed, smooth, clean, no cracks, no cavities, no pores, no blisters, free of scale and loose particles.
  • Robust design to prevent shaft deflection.
 
Stator
Stator is the main power house of the compressor. It creates magnetic field that induces on rotor and then in fundamental rule of electromagnetic induction-torque generation; the rotor gets the driving torque to rotate. Our Stator has 24 slots with high graded enamel coated copper wire. Its insulation can sustain up to 200 degree Celsius temperature which is far enough to sustain a harsh condition. The laminations used in the stator are the highest graded silicon steel around the world. Its slot fill factor is almost 0.91 with an overall efficiency of 86%. Together it is one of the most iconic low power consumption designs of the world.
 
Property:
  • Stator is the main power house of the compressor.
  • The laminations used in the stator are the higher graded silicon steel around the world. (<1.9w/kg loss)
  • Its slot fill factor is almost 0.83 with an overall efficiency of 86%.
  • It has 24 slots with Round wires made of copper, insulated with Polyester or Polyesterimide Enamel and coat satisfy the class G2 – 200 °C conditions when tested according to EN 60317-0-1 and EN 60317-0-3.
  • Especially heat treated design for reducing hysteresis and Eddy current loss.​
 
Rotor
A rotor is the central part of an electric motor. Our rotor is engineered to get maximum possible starting torque and efficiency. To get maximum combined efficiency, we use highest graded aluminum with a purity of 99.7% to cast our rotor. We use world famous THT (USA) and Bühlar (Switzerland) machines to cast our rotor, which gives us micron level precision in the final product. We select 28 slots in rotor stack, together with stator that give almost zero vibration in rotor rotation. For this our compressor has very low vibration and therefore the noise.
 
Property:
  • A rotor is the rotating part of an electric motor.
  • Our rotor is engineered to get maximum possible starting torque and efficiency.
  • To get maximum combined efficiency, we use higher graded aluminum with a purity of 99.7% to cast our rotor.
  • We select 28 slots in rotor stack, together with stator that give almost zero vibration in rotor rotation. For this our compressor has very low vibration and therefore the noise.
  • Vertical die casted for superior casting quality and heat treated for better startability.​
 
Suction muffler
Its main function is to separate oil from the circulating gas. In addition its design is so matched that, it absorbs noise that creates inside of the compressor.
 
Property:
  • Material: Celanex 3300, Valox VX4029, Ultradur B4300 G6
  • Surface: Complete molded, free of die casting residues, constant (no spots), no burrs, no pores, no cracks, no blisters, no impurities
  • To get maximum combined efficiency, we use higher graded aluminum with a purity of 99.7% to cast our rotor.
  • We select 28 slots in rotor stack, together with stator that give almost zero vibration in rotor rotation. For this our compressor has very low vibration and therefore the noise.
  • Perfectly engineered flow-system for absorbing noise.​
 
Terminal board assembly
This item is actually a combination of overload protector (OLP) and positive temperature co-efficient relay (PTC). OLP protects the compressor from overload situation from reverse rotation; and PTC works as a starting device, for this our compressor is completely safe in highly load shedding zone.
 
Property:
  • Easy to assemble
  • OLP used for motor protection.
  • Low power consumption design.
  • Class 1 protection used for electric shock.
  • Electro-Magnetic starter for hermetic compressor.
  • Ensuring overload protection and safety on reverse rotation.
 
Internal Discharge Tube
Its main function is to reduce noise, vibration and control the flow of gas.
 
Property:
  • Brazed gas proof up to 16 bar pressure.
  • Tensile strength: 285 N/mm2
  • No cracks, free of scale, free of flaking, free of blur, hard soldered seam, smooth, free of oxides, complete copper plated, no copper concentration
  • Yield Strength: 170 N/mm2
  • Vibration less, smooth flow with optimum pressure loss
 
Valveplate
Valve plates provide operators with a comprehensive range of both metallic and non-metallic plate valve assemblies and internal components, manufactured to the highest quality. Achieving the optimum performance and reliability which are keys to most operators to deliver valve plates across the broad spectrum of applications and operating conditions required. Our valve plates are machined with highest grade steel.
 
Property:
  • Very smooth surface finishing is maintained.
  • The roughness value is about 0.2 µm.
  • Highly precision machining to ensure surface roughness below 0.2 µm.
 

 
Low Noise:
Customer’s expectation and demand are the prime concerns of our product design. Our skilled design team works relentlessly on noise reduction to make our compressor quieter with maximum efficiency. We are offering a portfolio of modern and compact compressors that come with very low noise profile.


 
Wide Operating Voltage Range:
To minimize the effect of voltage fluctuation, expert R&D engineering team continuously works on the development of starting technology for the Compressor functioning at both low and high operating voltages. As a result, we are able to offer a spectrum of products that come with wide ranges of operating voltage, which can meet your demands accordingly.

 
Optimized Efficiency:
Energy efficiency is the prime concern while developing all kinds of products in Walton. Skilled R&D engineers are continuously researching on the development of Compressor to make it more efficient, quieter and more ecological. Thus, by our relentless dedication we are offering a full product range that offers compressors of standard efficiency.
 


 
Why should you choose it?
Walton innovates to build a more advanced, sustainable and environment friendly society through the combination of sophisticated technologies and expertise. Walton does not compromise with the quality issues of the products. We’ve built in-house advanced laboratory facilities from the best testing equipment manufacturers all over the world to ensure high quality products, strictly following the International Standards.
Features and Benefits:

- Optimum efficiency
- Very low Noise level.
- Wide ranges of Cooling Capacity.
- Units available for R134a & R600a.
- 100% factory tested.
- Corrosion resistant materials.
- Reverse Rotation Protection.
- Helium filled leak detection system ensures leak rate <7.6×10-8 mbar.l/sec for 100% compressor.
-All machined parts are checked by high precision lab machines. As example, for CMM the accuracy is 1.8 μ & for Roundness-Roughness measuring machines, the accuracy is 0.25 μ.
- High pressure, High temperature & 500000 cycles ON/OFF tests ensure great longevity of compressor life
- Electrical safety is maintained by following IEC 60335-2-34 International Standard