(320) 796-0851

Castair

100% DUTY CYCLE 

The most user friendly rotary screw compressors to install, operate, and maintain. As simple as power in, air out.

*2 year warranty on air end, electric motor & tank*.

OPERATION 

  • One solenoid operates AIR END, no computers.
  • Easy to read pressure and temperature gauges standard.
  • High pressure and dual high temperature shut down standard.
  • Factory filled with 4000 hours or one year synthetic lubricant.
  • Can be ordered with three pressure ranges – 135, 150 or 175 psi. (135 psi standard.)
  • 10 minute shut down timer standard, saves electricity when air is not required.
  • No lockout codes – like competition brands

MAINTENANCE

  • Built in air/oil separator with spin on filter.
  • Hour meter standard, for easy record keeping.
  • Off shelf V-belts with adjustable belt tightener standard.
  • Spin on oil filter, automotive type paper element air filter.
  • Air/oil lines are off shelf copper piping.
  • Air cooled aftercooler/oil cooler standard, can easily be
    removed for cleaning.
  • Heavy duty off shelf Industrial 1725RPM motors, with
    full 15% service factor.
  • Heavy duty off shelf Industrial 1725RPM motors, with full 15% service factor or higher.
  • 2-year warranty on air end, electric motor & tank.

INSTALLATION

  • Quality name brand off the shelf magnetic starter & controls, mounted and wired, just connect power.
  • Self contained on a USA made ASME Tank, eliminates a water separator and plumbing to a tank.
The Castair R7318VP75 is a heavy-duty rotary screw industrial air compressor, engineered by Castair, a family-owned Minnesota company since 1991, for continuous, high-performance operation in demanding dairy operations, large equipment maintenance shops, and industrial settings requiring a reliable, high-volume air supply. Designed for a 100% duty cycle, this compressor combines user-friendly installation, operation, and maintenance with energy-efficient features, making it ideal for dairy farms, agricultural equipment repair, and heavy machinery applications. It delivers approximately 30 CFM at 135 PSI (standard, with options for 150 or 175 PSI), powered by a 7.5 HP, 208-230/460V, 3-phase industrial motor running at 1725 RPM with a full 15% service factor. The 80-gallon vertical ASME-certified, powder-coated tank ensures safety, corrosion resistance, and ample air storage, perfect for powering pneumatic tools used in dairy operations, such as milking systems, barn ventilation equipment, and heavy machinery maintenance tools like impact wrenches and pneumatic lifts. Equipped with automotive-type paper element air filters and spin-on oil filters, the R7318VP75 maintains clean air intake and simplifies maintenance. A built-in air/oil separator with a spin-on filter and air-cooled aftercooler/oil cooler (removable for cleaning) enhances efficiency and durability. The compressor features a 10-minute shutdown timer to save electricity when air is not required, high-pressure and dual high-temperature shutdowns for safety, and off-shelf V-belts with an adjustable belt tightener for reliable operation. Easy-to-read pressure and temperature gauges, an hour meter, and off-shelf copper piping for air/oil lines further simplify monitoring and maintenance. Key features include a single solenoid for air end operation (no computers), factory-filled 4000-hour/one-year synthetic lubricant, and a 2-year warranty on the air end, electric motor, and tank. The slow RPM, oil-lubricated cast iron pump ensures quiet operation and extended service life, while precision steel connecting rods, tapered roller bearings, and disc/spring valves enhance reliability and efficiency. Measuring approximately 33" L x 24" W x 72" H and weighing around 695 lbs, the R7318VP75 is built for stationary use in dairy barns or equipment shops, with pre-mounted quality name-brand magnetic starters for easy setup. For dairy and large equipment applications, the rotary screw design ensures continuous air supply for milking machines, pneumatic actuators, and heavy-duty tools, while the energy-saving shutdown timer reduces costs during idle periods. All Castair compressors are built to order, allowing customization. For inquiries or to tailor features, heavy-duty rotary screw air compressor for dairy farms, Castair R7318VP75 80-gallon vertical tank compressor, industrial air compressor with 100% duty cycle Minnesota, ASME-certified rotary screw compressor for milking systems, quiet operation air compressor 30 CFM 135 PSI, Baldor motor air compressor for agricultural equipment maintenance, durable cast iron pump compressor for barn ventilation, Minnesota-manufactured air compressor for large machinery repair, energy-efficient rotary screw compressor for dairy pneumatic tools, industrial air compressor for farm equipment shops and heavy-duty applications.

CASTAIR Rotary Screw Compressor 100% duty cycle 135 PSI standard

HP  Phase  Tank  GAL/TYPE  CFM @  100 PSI  LxWxH  Dimension  Wt. (lbs)  Unit Model
5  1  80 vert.  20  34x26x70  480  R518VP75 
5  1  80 horiz.  20  64x32x44  480  R518HP75 
7.5  1  80 vert.  31  34x26x70  555  R718VP75 
7.5  1  80 horiz.  31  64x32x44  555  R718HP75 
10  1  80 vert.  40  34x26x70  565  R1018VP75 
10  1  80 horiz.  40  64x32x44  565  R1018HP75 
10  1  120 vert.  40  44x32x73  660  R10112VP75
10  1  120 horiz.  40  69x33x55  660  R10112HP75 
5  3  80 vert.  20  34x26x70  470  R538VP75 
5  3  80 horiz.  20  64x32x44  470  R538HP75 
7.5  3  80 vert.  31  34x26x70  546  R738VP75 
7.5  3  80 horiz.  31  64x32x44  546  R738HP75 
10  3  80 vert.  40  34x26x70  585  R1038VP75
10  3  80 horiz.  40  64x32x44  585  R1038HP75 
10  3  120 vert.  40  44x32x73  645  R10312VP75 
10  3  120 horiz.  40  69x33x55  645  R10312HP75 
15  3  120 vert.  52  44x32x73  765  R15312VP75 
15  3  120 horiz.  52  69x33x55  765  R15312HP75
15  3  120 vert.  58  44x32x73  930  R15312VG30 
15  3  120 horiz.  58  69x33x55  930  R15312HG30 
20  3  120 vert.  80  44x32x73  930  R20312VG30 
20  3  120 horiz.  80  69x33x55  930  R20312HG30 
25  3  120 vert.  105  44x32x73  1045  R25312VG30 
25  3  120 horiz.  105  69x33x55  1045  R25312HG30 
30  3  120 vert.  130  44x32x73  1065  R30312VG30 
30  3  120 horiz.  130  69x39x55  1065  R30312HG30 

Call for pricing on 40hp & above.

Options: Factory Mounted

5-30hp 230V standard  460V 
Electronic auto tank drain #SDV03M 
4”x4”x1” vibration pads (set of 4) #VP1004 

Ball valves full flow

HP  Part #  Dimension 
5 – 10  BV75  3/4” 
15 – 20  BV100  1” 
25 – 40  BV125  1.25” 
50 – 60  BV150  1.50” 

Metal flex hose all are 18” length

Part #  Dimension 
VA075  3/4”NPT x 18” 
VA100  1”NPT x 18” 
VA125  1.25” NPT x 18” 
VA150  1.50” NPT x 18” 

Preventative maintenance kits

You save 10% when purchased as a kit.

2-air filters, 4-oil filters, 1-separator filter, 5-gallons synthetic CAST-LUBE oil

Part #  Preventative maintenance Kit for:  HP 
MKP75P75 air end5-15
MKD3-4  D3, D31, & D4 air end  5 – 10 
MKD6  D6 air end  15 – 20 
MKD62  D62 air end  15 – 25 
MKG11  G11 air end  5 – 15 
MKG30R  G30 air end  15 – 30 
MKD10  D10 air end  25 – 40 
MKD16  D16 air end  50 – 60 

MAINTENANCE FILTERS

Part #Description
20DPAir filter P75
RAFD3-4  Air filter D3, D31 & D4 paper
(ID: 2 7/8”, OD: 4 5/8”, HGT: 2 7/16”) 
RAFD6-62  Air filter D6 & D62 paper
(ID: 4 3/4”, OD: 6 1/8”, HGT: 2 7/8”) 
RAFD10  Air filter D10 paper
(ID: 6 3/8”, OD: 9 1/2”, HGT: 5”) 
RAFD16  Air filter D16 paper
(ID: 6 3/8”, OD: 9 1/2”, HGT: 7 7/8”) 
RAFG11  Air filter G11 paper
(ID: 2 5/8”, OD: 3 7/8”, HGT: 3 1/8”) 
32DP  Air filter G30 paper
(ID: 5 3/4”, OD: 9 1/4”, HGT: 5 3/16”) 
ROFD3-4-G11  Oil filter D3, D31, D4, G11 spin on 
ROFD6  Oil filter D6 spin on 
ROFD62-P75  Oil filter D62/P75 spin on 
ROFD10  Oil filter D10 spin on 
ROFD16-G30  Oil filter D16, G30 spin on 
RSFD3-4-6-G11-P75  Separator filter D3, D31, D4 & D6, P75 & G11 spin on 
RSFD62  Separator filter D62 spin on 
RSFD10-16-G30  Separator filter D10, D16, G30 spin on