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B548 Miniature Series Integral Filter / Regulator

IS-B548

Service

Caution: Disconnect or shut off air supply and exhaust the

primary and secondary pressures before servicing unit.
Turning the adjusting knob counterclockwise does not vent
downstream pressure on non-relieving regulators. Downstream
pressure must be vented before servicing regulator.

Caution: Grease packets are supplied with kits for lubrication

of seals. Use only mineral based grease or oils. Do not use
synthetic oils such as esters. Do not use silicones.

Note: After servicing unit, turn on air supply and adjust regulator

to the desired downstream pressure. Check unit for leaks. If
leakage occurs, do not operate - conduct repairs and retest.

Servicing Filter Element -

(Refer to Figure 1)

1. Unscrew and remove Bowl.
2. Unscrew the Element Retainer from Body and then remove Element.
3. Clean all internal parts and bowl before reassembling.
4. Install new element. IMPORTANT: The Filter / Regulator will not

operate properly if the Deflector is not installed properly. The
Deflector must be installed between the Element Retainer and
the Filter Body.

5. Attach Element Retainer and finger tighten firmly.
6. Replace Bowl Seal. Lightly lubricate new seal to assist with

retaining it in position.

7. Install Bowl into Body and tighten; hand tight, plus 1/4 turn.

Servicing Regulator -

(Refer to Figure 1)

1. Disengage the Adjusting Knob by pulling upward. Turn Adjusting

Knob counterclockwise until the compression is released from
the Pressure Control Spring.

2. Remove the Bonnet and Bowl assemblies by unscrewing the

Bonnet and Bowl from the body.

3. Remove Diaphragm Assembly from Bonnet Assembly.
4. Remove Element Retainer, Filter Element, Poppet Assembly,

Poppet Return Spring.

5. Clean and carefully inspect parts for wear or damage. Wipe

parts, clean with soapy water or denatured alcohol

but do not

use denatured alcohol on plastic bowl or sight gauge

. If

using compressed air to blow dry, be sure to wear appropriate
eye protection. If replacement is necessary, use parts from service
kits. Clean Bowl.

6. Lubricate O-rings with grease found in service kits.
7. Install Filter Element onto the Element Retainer and firmly tighten.
8. Install Poppet Return Spring, Poppet Assembly, and Element

Retainer. IMPORTANT: The Filter / Regulator will not operate
properly if the Defector is not installed properly. The Deflector
must be installed between the Element Retainer and Filter Body.

9. Install Diaphragm Assembly into Body Assembly. Assemble

Bonnet Assembly onto Body and tighten per Figure 1.

10. Install Bowl into Body and tighten, hand tight, plus 1/4 turn.

5. Install Filter / Regulator vertically with the bowl drain mechanism

at the bottom. Free moisture will thus drain into the sump (“quiet
zone”) at the bottom of the bowl.

6. Gauge ports are located on both sides of the Filter / Regulator

body for your convenience. It is necessary to install a gauge or
socket pipe plugs into each port during installation.

Operation

1. Both free moisture and solids are removed automatically by the

filter.

2. Manual drain filters must be drained regularly before the separated

moisture and oil reaches the bottom of the Baffle or End Cap.

3. The Filter Element should be removed and replaced when

pressure differential across the filter is 69 kPa (10 PSIG).

4. Before turning on the air supply, disengage the Adjusting Knob

by pulling upward. Turn Adjusting Knob counterclockwise until
the compression is released from the Pressure Control Spring.

5. Then turn Knob clockwise and adjust regulator to desired

downstream pressure. This permits pressure to build up slowly
in the downstream line.

6. To decrease regulated pressure settings, always reset from a

pressure lower than the final setting required. Example, lowering
the secondary pressure from 550 to 410 kPa (80 to 60 PSIG) is
best accomplished by dropping the secondary pressure to 350
kPa (50 PSIG), then adjusting upward to 410 kPa (60 PSIG).

7. When desired secondary pressure setting has been reached,

push the Knob down to lock this pressure setting.

Figure 1

Lightly grease with provided lubricant.

Inspect for nicks, scratches, and surface imperfections.
If present, reduced service life is probable and
future replacement should be planned.

Clean with lint-free cloth.

Knob

Spring Cage (Bonnet) - Torque:
4.5 to 5.6 Nm (40 to 50 in. lb.)

Adjusting Screw Assembly

Control Spring

Spring, Return

Diaphragm Assembly
(Includes Upper Diaphragm Plate
& Lower Diaphragm Button