GRACO 25T478 – Medium Pressure Fluid Back Pressure Regulator, 1000 Max psi, 5 gpm Max flow rate,

GRACO 25T478 – Medium Pressure Fluid Back Pressure Regulator, 1000 Max psi, 5 gpm Max flow rate, SST, Pneumatic, 3/8″ NPT

Medium pressure pneumatic back pressure regulator designed to maintain upstream fluid pressure regardless of flow demand, enabling precise finishing process control. Maintains consistent fluid control crucial for quality finishing processes while allowing operators to trigger guns, valves and other flow controls without affecting system pressure.

Improve finishing process control with this medium pressure, pneumatic back pressure regulator (BPR).

Additional Specifications

Flow Rate: 0-5 gpm

Thread: 3/8 in. NPT

Type: Pneumatic

Dimensions A: 4.84 in. (123 mm)

Dimensions B: 2.38 in. (60 mm)

Max Fluid Inlet Pressure: 3000 PSI (20.7 MPa, 207 bar)

Max Air Working Pressure: 100 PSI (0.7 MPa, 7.0 bar)

Approvals: CE, Ex h IIB T6 Gb, 0°C to 50°C

Protection Type: constructional safety ‘c’

Flow Type: Lower Flow

Specifications

Compatible Material	Waterborne, Solventborne
Gauge Port Size (in)	1/4
Gauge Port Type	NPT
Inlet Size (in)	0.375
Inlet Thread Type	NPT
Maximum Air Inlet Pressure (psi)	100
Maximum Flow Rate (GPM)	5
Maximum Operating Temperature (°F)	122
Maximum Regulated Pressure (psi)	1000
Maximum Viscosity (cP)	250
Maximum Working Pressure (psi)	3000
Minimum Operating Temperature (°F)	32
Minimum Regulated Pressure (psi)	100
Outlet Size (in)	0.375
Outlet Thread Type	NPT
Type	Back Pressure Regulator
Wetted Material	Stainless Steel, Tungsten Carbide, PTFE, Acetal Homopolymer

Features

Maintains upstream fluid pressure regardless of flow demand

Interfaces with GRACO’s Intelligent Paint Kitchen (IPK) for automated control

Better resolution than other brands for more accurate pressure control

Pneumatic operation for precise control

Wet parts made of stainless steel, tungsten carbide, PTFE, and acetal homopolymer

Applications

Finishing process control

Paint spray systems

Industrial coating applications

Systems requiring consistent fluid pressure control

Compatible Equipment

GRACO’s Intelligent Paint Kitchen (IPK)

Spray guns and valves

Flow control systems

Related Parts

25T477 – Medium Pressure Fluid Back Pressure Regulator, 2000 Max psi, 5 gpm Max flow rate, SST, Pneumatic, 3000 PSI, 3/8″ NPT

25R490 – Medium Pressure Fluid Back Pressure Regulator, 3000 Max psi, 5 gpm Max flow rate, SST, Pneumatic, 3/8″ NPT

25R491 – Medium Pressure Fluid Back Pressure Regulator, 3000 Max psi, 5 gpm Max flow rate, SST, Mechanical w/ locking nut, 3/8″ NPT

105770 – Pressure Gauge, 0-1000 PSI, Stainless, Bottom Mount, 1/4″ NPT(M)

17L706 – Pressure Gauge, 0-3000 PSI, Stainless, Bottom Mount, 1/4″ NPT(M)

Part of GRACO’s medium pressure BPR family with three pneumatic options (1000 PSI, 2000 PSI, 3000 PSI) and one mechanical option. Installation and operation instructions available in manual 3A7681. Regulated range is 2501000 PSI (1.77 MPa, 1770 bar) above 3 gpm (11 lpm). Type of Protection ‘d’ applied is constructional safety ‘c’. Part of the Lower Flow Medium Pressure BPR pneumatic series. The diagram shows the assembly structure with numbered components 1-14, but specific part breakdowns are not provided for individual model variations.

Reference Manuals

345174 (Page 2) Medium Pressure BPRs

3A7681 (Page 2) Medium Pressure Back Pressure Regulators