556 SERIES BALANCED PRESSURE REGULATOR

Maximum Operating Pressure — 1500 psi
Maximum Operating Temperature — 180°F
Maximum flow Rate 7 GPM

Design Considerations

The 556 Series In Line Balanced Pressure Regulator is designed for carwash and pressure wash applications where a weep gun is used or bypass can be returned to the supply tank. The 556 Series In Line Regulator is available in three standard spring pressure ranges 2000 psi and can be used in systems with more than one outlet. The 556 Series In Line Regulator mounts to the pump outlet and is repairable. The 556 Series In Line Regulator is available with Buna-N, Ethylene Propylene and Fluoroelastomer (Viton®) seals for chemical compatibility.

Options

Material Options

Brass Body, Ends and Adjustment Cap, 316 Stainless Piston, 303 Stainless Seat 316 Stainless Piston, 303 Stainless Seat

Seal Options

Buna-N, Ethylene Propylene, Fluoroelastomer (Viton®)

Body Options

3/8 Female x 3/8 Female NPT, 3/8 Female x 3/8 Male NPT

Bypass End Options

3/8 Female NPT

Spring Options

Replacement Part Options

500 psi (Blue Spring) 1000 psi (Red Spring) 2000 psi (Gold Spring)	Part Numbers 5550140 5550130 5550120
Piston, 316 Stainless Quad Ring/Backing Ring Piston Seal Kit, Buna-N Quad Ring/Backing Ring Piston Seal Kit, Ethylene Propylene Quad Ring/Backing Ring Piston Seal Kit, Fluoroelastomer (Viton®) Seat/O-Ring Seal Kit, Buna-N Seat/O-Ring Seal Kit, Ethylene Propylene Seat/O-Ring Seal Kit, Fluoroelastomer (Viton®)	5790060 5550490 5551690 5551990 5550590 5552090 5552190

Example of how to order

Body
Brass

Body
3/8 MNPT x 3/8 FNPT

Bypass End
3/8 FNPT

Seal
Buna-N

Spring
1000 psi

SMC Part Number: BPR BRS 556-6M6F-B,1000 psi

SMC Part Numbers are a description of the regulator as read left to right, Inlet to Outlet.
Example: BPR BRS 555-6M6F-B,1000 psi = 3/8 MNPT Inlet x 3/8 FNPT Outlet