fluid-regulators

Fluid Pressure Regulators

Providing a combination of high-flow performance, easy maintenance, and precise adjustment, ARO Fluid Regulators are recognized to be the premier regulators in the industry. Their reliable performance and innovative design features make them the preferred choice among fluid handling operators and material dispensing specialists. 

The ARO I.D.L.® Fluid Regulator features smooth, consistent pressure regulation with easy-turn adjustment.
  • Multiple materials of construction
  • Standard / High capacity options
  • Floating seat design
  • Remote models
  • Pressure gauge and riser tube included
  • “Easy-flush” mode

Fluid Regulator Brochure


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Fluid Regulator Features

Seat-Plug

Easy-access Seat Plug 

Removable seat plug allows for quick access to the ball and seat of the fluid regulator for immediate seat access. The feature reduces downtime for cleaning or replacing the seat, if needed. It also allows users to switch to different ball and seat sizes to achieve different flow rates.

Large-Adjustment-Spring

Larger Adjustment Spring

A large diameter counter-spring is used to ensure a consistent pressure output and wide pressure range capabilities. Models are configurable with different spring range options to provide enhanced performance and improved regulator life-span.

Tamper-resistant-Screw

Tamper-resistant Spring Adjust

ARO’s industrial downstream regulator models have a recessed hex-head fitting allowing pressure adjustment using the same 3/8” wrench (included) that removes the housing. This screw is recessed, which helps avoid any accidental or unauthorized adjustment changes.

Dual-Diaphragm

Dual Diaphragm

ARO industrial fluid regulators utilize a diaphragm-to- ball check design. This dual diaphragm arrangement stands up to abrasive materials, prevents “caking” and allows for easier flushing. The diaphragm-to-seat ratio allows for consistent regulator performance, where pump “trip-over” and multiple application demands exist.

Floating-Seat-and-Ball

“Floating” Seat and Ball Arrangement

A large diameter counter-spring is used to ensure a consistent pressure output and wide pressure range capabilities. Models are configurable with different spring range options to provide enhanced performance and improved regulator life-span.

Needle-Bearing

Smooth-Turn Needle Bearing

A needle bearing has been incorporated to permit a smoother, easier adjustment – rather than relying on just spring adjustment – and can even be done while the regulator is on-line and operating.

“Easy-Flush” Mode

ARO’s industrial downstream regulator models have a unique flush-out mode, where by simply turning a key (provided) clockwise, the entire center spindle moves downward, forcing the ball off the seat and purging the entire regulator of particle build-up.

Base Housing Material Choices

Low-pressure regulator bases are available in 300 series stainless steel or zinc/aluminum. High-pressure bases are available in 300 series stainless steel or Electroless Nickel-plated carbon steel for wide material compatibility. All regulator seals are constructed of PTFE for maximum chemical compatibility.

Easy-Access Housing Fasteners

Our industrial regulators can be opened for maintenance or inspection by removing four, easy to reach hex-head screws. There’s no need to remove the regulator from the line while doing this, either. The upper housing is constructed of corrosion-resistant zinc aluminum for a sleek, clean appearance and a long, rust-free life.

Typical Applications


Back-pressure fluid regulators are typically used in recirculating or closed loop systems, allowing them to maintain fluid pressure of the system either upstream of the fluid regulator or downstream of the dispensing device. Back-pressure fluid regulators help maintain fluid pressure regardless of changing flow demand triggered by multiple operators or dispense points.

Fluid Pressure Regulator Applications

Dead End System

Fluid Pressure Regulator Dead End Applications

Recirculating System

Fluid Pressure Regulator Recirculation Applications

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1/4” Port Downstream Models

Materials of Construction
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar)* Maximum Inlet Pressure psi (bar)
27520-000 1/4" Stainless Steel Tungsten Carbide 5 - 125 (0.3 - 8.5) 750 (51.7)
27520-100 1/4" Stainless Steel Tungsten Carbide 0 - 50 (0 - 3.4) 750 (51.7)
27520-200 1/4" Stainless Steel Tungsten Carbide 10 - 250 (0.6 - 17.1) 750 (51.7)
27520-400 1/4" Stainless Steel Tungsten Carbide 0 - 30 (0 - 2.0) 750 (51.7)

3/8” Port Downstream Models

Standard Flow Capacity - Flow Rates** to 3 gpm (11.4 l)

Materials of Construction
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max. Inlet Pressure psi (bar) Working Pressure w/ Gauge psi (bar) Gauge Model No. (included) Gauge Pressure Range psi
651790-A1B-B 3/8" Zinc/Aluminum Tungsten Carbide 0 - 30 (0 - 2) 800 (55) 120 (8.1) 93656-1 0 - 60
651790-A1C-B 3/8" Zinc/Aluminum Tungsten Carbide 20 - 60 (1.3 - 4.1) 800 (55) 120 (8.1) 93656-1 0 - 60
651790-A1D-B 3/8" Zinc/Aluminum Tungsten Carbide 50 - 200 (3.4 - 14) 800 (55) 600 (40) 93887 0 - 300
651790-A3B-B 3/8" Stainless Steel Tungsten Carbide 0 - 30 (0 - 2) 800 (55) 120 (8.1) 93657-1 0 - 60
651790-A3C-B 3/8" Stainless Steel Tungsten Carbide 20 - 60 (1.3 - 4.1) 800 (55) 120 (8.1) 93657-1 0 - 60
651790-A3D-B 3/8" Stainless Steel Tungsten Carbide 50 - 200 (3.4 - 14) 800 (55) 600 (40) 93888 0 - 300
651790-A4B-B 3/8" Stainless Steel 300 Stainless Steel 0 - 30 (0 - 2) 800 (55) 120 (8.1) 93657-1 0 - 60
651790-A4C-B 3/8" Stainless Steel 300 Stainless Steel 20 - 60 (1.3 - 4.1) 800 (55) 120 (8.1) 93657-1 0 - 60
651790-A4D-B 3/8" Stainless Steel 300 Stainless Steel 50 - 200 (3.4 - 14) 800 (55) 600 (40) 93888 0 - 300

* Without Gauge
** Flow rates tested in 30 wt. oil


3/8” Port Models

High Flow Capacity - Flow Rates** to 6 gpm (22.7 l)

Materials of Construction
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max.InletPressure psi (bar) Working Pressure w/ Gaugepsi (bar) Gauge Model No. (included) Gauge Pressure Range psi
651790-B1D-B 3/8" Zinc/Aluminum Tungsten Carbide 30 - 200 (2 - 14) 1250 (86) 600 (40) 93887 0 - 300
651790-B1E-B 3/8" Zinc/Aluminum Tungsten Carbide 100 - 800 (7 - 55) 1250 (86) 1250 (86) 93503-1 0 - 1000
651790-B2E-B 3/8" Stainless Steel 400 Stainless Steel 100 - 800 (7 - 55) 1250 (86) 1250 (86) 93504-1 0 - 1000
651790-B3D-B 3/8" Stainless Steel Tungsten Carbide 30 - 200 (2 - 14) 1250 (86) 600 (40) 93888 0 - 300
651790-B3E-B 3/8" Stainless Steel Tungsten Carbide 100 - 800 (7 - 55) 1250 (86) 1250 (86) 93504-1 0 - 1000
651790-B4D-B 3/8" Stainless Steel 300 Stainless Steel 30 - 200 (2 - 14) 1250 (86) 600 (40) 93888 0 - 300
651783 3/8" Stainless Steel 400 Stainless Steel 100 - 500 (7 - 35) 1250 (86) N/A N/A N/A

* Without Gauge


3/8” Port Remote Models

Standard Flow Capacity - Flow Rates** to 3 gpm (11.4 l)

Materials of Construction
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max. Inlet Pressure psi (bar) Working Pressure w/ Gauge psi (bar) Gauge Model No. (included) Gauge Pressure Range psi
651790-A1R-B 3/8" Zinc/Aluminum Tungsten Carbide 30 - 200 (2 - 14) 500 (34) N/A N/A N/A
651790-A3R-B 3/8" Stainless Steel Tungsten Carbide 30 - 200 (2 - 14) 500 (34) N/A N/A N/A
651790-A4R-B 3/8" Stainless Steel 300 Stainless Steel 30 - 200 (2 - 14) 500 (34) N/A N/A N/A

* Without Gauge


3/8” Port Remote Models

High Flow Capacity - Flow Rates** to 6 gpm (22.7 l)

Materials of Construction
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max. Inlet Pressure psi (bar) Working Pressure w/ Gauge psi (bar) Gauge Model No. (included) Gauge Pressure Range psi
651790-B4R-B 3/8" Stainless Steel 300 Stainless Steel 30 - 200 (2 - 14) 500 (34) N/A N/A N/A
651782 3/8" Stainless Steel Tungsten Carbide 100 - 800 (7 - 55) 1250 (86) N/A N/A N/A

* Without Gauge
** Flow rates tested in 55 CPS material.


3/8” Back-pressure Models

High Flow Capacity - Flow Rates** to 6 gpm (22.7 l)

Materials of Construction
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max. Inlet Pressure psi (bar) Gauge Model No. (included) Gauge Pressure Range psi
651791-B1D-B 3/8" Zinc/Aluminum Tungsten Carbide 0 - 200 (0 - 14) 200 (14) 93887 0 - 300
651791-B1E-B 3/8" Zinc/Aluminum Tungsten Carbide 0 - 800 (0 - 55) 800 (55) 93503-1 0 - 1000
651791-B3D-B 3/8" Stainless Steel Tungsten Carbide 0 - 200 (0 - 14) 200 (14) 93888 0 - 300
651791-B3E-B 3/8" Stainless Steel Tungsten Carbide 0 - 800 (0 - 55) 800 (55) 93504-1 0 - 1000
651791-B4D-B 3/8" Stainless Steel 300 Stainless Steel 0 - 200 (0 - 14) 200 (14) 93888 0 - 300

1-1/4” Back-pressure Models

System Flow Capacity - Flow Rates** to 18.5 gpm (70.1 l)

Materials of Construction
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max. Inlet Pressure psi (bar) Gauge Model No. (included) Gauge Pressure Range psi
651791-C3D-B 1-1/4" Stainless Steel Tungsten Carbide 0 - 200 (0 - 14) 200 (14) 93888 0 - 300
651791-C4D-B 1-1/4" Stainless Steel 300 Stainless Steel 0 - 200 (0 - 14) 200 (14) 93888 0 - 300

** Flow rates tested in 55 CPS material.

3/8” Port Models

Standard Flow Capacity - Flow Rates** to 3 gpm (11.4 l)

  Materials of Construction  
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar)* Maximum Inlet Pressure psi (bar)
651780-A1A-B 3/8" Carbon Steel Tungsten Carbide 100 - 1250 (7 - 86) 3000 (207)
651780-A1B-B 3/8" Carbon Steel Tungsten Carbide 1000 - 3000 (69 - 207) 6000 (414)
651780-A3A-B 3/8" Stainless Steel Tungsten Carbide 100 - 1250 (7 - 86) 3000 (207)
651780-A3B-B 3/8" Stainless Steel Tungsten Carbide 1000 - 3000 (69 - 207) 6000 (414)

3/8” Port Models

High Flow Capacity - Flow Rates** to 6 gpm (22.7 l)

  Materials of Construction  
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar)* Maximum Inlet Pressure psi (bar)
651780-B1A-B 3/8" Carbon Steel Tungsten Carbide 400 - 1250 (28 - 86) 3000 (207)
651780-B1B-B 3/8" Carbon Steel Tungsten Carbide 1000 - 3000 (69 - 207) 6000 (414)
651780-B3A-B 3/8" Stainless Steel Tungsten Carbide 400 - 1250 (28 - 86) 3000 (207)
651780-B3B-B 3/8" Stainless Steel Tungsten Carbide 1000 - 3000 (69 - 207) 6000 (414)
651784 3/8" Carbon Steel Tungsten Carbide 400 - 1125 (28 - 78) 3000 (207)
651785 3/8" Carbon Steel Tungsten Carbide 75 - 450 (5 - 31) 3000 (207)
651786 3/8" Carbon Steel Tungsten Carbide 150 - 1200 (10 - 83) 6000 (414)

3/8” Port Back-pressure Models

High Flow Capacity - Flow Rates** to 6 gpm (22.7 l)

  Materials of Construction  
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar)* Maximum Inlet Pressure psi (bar)
651781-B1B-B 3/8" Carbon Steel Tungsten Carbide 100 - 3000 (7 - 207) 3000 (207)
651781-B3B-B 3/8" Stainless Steel Tungsten Carbide 100 - 3000 (7 - 207) 3000 (207)

3/8” Remote Models

High Flow Capacity - Flow Rates** to 6 gpm (22.7 l)

  Materials of Construction  
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max.
Inlet
Pressure psi (bar)
651780-B1R-B 3/8" Carbon Steel Tungsten Carbide 400 - 5000 (28 - 345) 6000 (414)
651780-B3R-B 3/8" Stainless Steel Tungsten Carbide 400 - 5000 (28 - 345) 6000 (414)

3/4” Downstream Models

Mastic Flow Capacity - Flow Rates** to 20 gpm (75.7 l)

  Materials of Construction  
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max.
Inlet
Pressure psi (bar)
651780-C1B-B 3/4" Carbon Steel Tungsten Carbide 750 - 2500 (52 - 172) 6000 (414)
651780-C1C-B 3/4" Carbon Steel Tungsten Carbide 2000 - 5000 (138 - 345) 6000 (414)
651780-C1R-B 3/4" Carbon Steel Tungsten Carbide 750 - 5000 (52 - 345) 6000 (414)
651780-C3B-B 3/4" Stainless Steel Tungsten Carbide 750 - 2500 (52 - 172) 6000 (414)

3/4” Back-pressure Models

Mastic Flow Capacity - Flow Rates** to 20 gpm (75.7 l)

  Materials of Construction  
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max.
Inlet
Pressure psi (bar)
651781-C1B-B 3/4" Carbon Steel Tungsten Carbide 100 - 3000 (7 - 207) 3000 (207)
651781-C3B-B 3/4" Stainless Steel Tungsten Carbide 100 - 3000 (7 - 207) 3000 (207)

3/4” Remote Models

Mastic Flow Capacity - Flow Rates** to 20 gpm (75.7 l)

  Materials of Construction  
Model Number Port Size (NPTF) Base Housing Seat Regulated Pressure Range psi (bar) Max.
Inlet
Pressure psi (bar)
651781-C1B-B 3/4" Carbon Steel Tungsten Carbide 750 - 2500 (52 - 172) 3000 (207)
651781-C3B-B 3/4" Stainless Steel Tungsten Carbide 750 - 2500 (52 - 172) 3000 (207)
Regulator Model Repair Kit
651790-A1B-B 637219-2A1-B
651790-A1C-B 637219-2A1-B
651790-A1D-B 637219-2A1-B
651790-A3B-B 637219-2A1-B
651790-A3C-B 637219-2A1-B
651790-A3D-B 637219-2A1-B
651790-A4B-B 637219-2A4-B
651790-A4C-B 637219-2A4-B
651790-A4D-B 637219-2A4-B
651790-B1D-B 637219-2B1-B
651790-B1E-B 637219-2B1-B
651790-B2E-B 637219-2B2-B
651790-B3D-B 637219-2B1-B
651790-B3E-B 637219-2B1-B
651790-B4D-B 637219-2B4-B
651783 637219-2B1-B
651790-A1R-B 637219-2A1-B
651790-A3R-B 637219-2A1-B
651790-A4R-B 637219-2A4-B
651790-B4R-B 637219-2A4-B
651782 61962-1
651791-B1D-B 637219-3B1-B
651791-B1E-B 637219-3B1-B
651791-B3D-B 637219-3B1-B
651791-B3E-B 637219-3B1-B
651791-B4D-B 637219-3B4-B
651791-C3D-B 637219-3C1-B
651791-C4D-B 637219-3C4-B
651780-A1A-B 637219-0A1-B
651780-A1B-B 637219-0A1-B
651780-A3A-B 637219-0A1-B
651780-A3B-B 637219-0A1-B
651780-B1A-B 637219-0B1-B
651780-B1B-B 637219-0B1-B
651780-B3A-B 637219-0B1-B
651780-B3B-B 637219-0B1-B
651784 637219-01B-B
651785 61962-1
651786 61962-1
651781-B1B-B 637219-1B1-B
651781-B3B-B 637219-1B1-B
651780-B1R-B 637219-0B1-B
651780-B3R-B 637219-0B1-B
651780-C1B-B 637219-0C1-B
651780-C1C-B 637219-0C1-B
651780-C3B-B 637219-0C1-B
651781-C1B-B 637219-1C1-B
651781-C3B-B 637219-1C1-B
651780-C1R-B 637219-0C1-B
651780-C3R-B 637219-1C1-B