Wilkerson H12 User Manual

Englewood, CO 80110

Installation and Service Instructions:
83-957-000

1/4" & 3/8"
H12 Pilot Controlled Regulator

ISSUED: September, 2002
Supersedes: November, 2001

ECN020442, Rev.2

WARNING

!

To avoid unpredictable system behavior that can cause personal
injury and property damage:

• Disconnect electrical supply (when necessary) before installation,
servicing, or conversion.

• Disconnect air supply and depressurize all air lines connected to
this product before installation, servicing, or conversion.

• Operate within the manufacturer’s specified pressure, temperature,
and other conditions listed in these instructions.

• Medium must be moisture-free if ambient temperature is below
freezing.

• Service according to procedures listed in these instructions.

• Installation, service, and conversion of these products must be
performed by knowledgeable personnel who understand how
pneumatic products are to be applied.

• After installation, servicing, or conversion, air and electrical
supplies (when necessary) should be connected and the product
tested for proper function and leakage. If audible leakage is present,
or the product does not operate properly, do not put into use.

• Warnings and specifications on the product should not be covered
by paint, etc. If masking is not possible, contact your local
representative for replacement labels.

Introduction:

Follow these instructions when installing, operating, or servicing
the product.

Application Limits

These products are intended for use in general purpose
compressed air systems only.

Operating Pressure:

Maximum Inlet Pressure 1734 250 17.3

Ambient Temperature Range: 0°C to 80°C (32°F to 175°F)

kPa PSIG bar

Symbols

4. For protection against rust, pipe scale and other foreign
matter, install a filter on the upstream (high pressure) side
as close to the regulator as possible.

Operation

1. Before turning on the air supply, turn the adjusting knob on
the pilot (master) regulator until compression is released
from the pressure control spring. Turn on air supply to the
master regulator and the pilot controlled regulator. Adjust
the downstream pressure by turning adjusting knob on the
master regulator until the desired downstream pressure is
obtained.

2. To decrease regulated pressure setting, always reset from
a pressure lower than the final setting required. Example,
lowering the secondary pressure from 80 PSIG to 60 PSIG
is best accomplished by dropping the secondary pressure
to 50 PSIG, then adjusting upward to 60 PSIG.

Service

CAUTION: SHUT OFF AIR SUPPLY and depressurize the

!

unit. Turn the adjusting knob on the master regulator until
pilot pressure is relieved on the pilot controlled regulator.

A. Use the following procedure to service the regulator

piston:

1. Unscrew the threaded collar and remove the bonnet assembly.

2. Disassemble, clean and carefully inspect parts for wear or
damage. If replacement is necessary, use parts from the
service kits.

3. Lubricate bonnet bore with grease found in kit. Carefully
install piston seals as shown in assembly drawing. The V
side of each seal must be installed facing the end of the
piston. Install vent seal if repairing a relieving regulator. Install
piston assembly into bonnet

4. Assemble bonnet assembly to body and tighten threaded
collar per Figure 1.

Relieving Non-Relieving

Installation

1. The regulator should be installed with reasonable
accessibility for service whenever possible – repair service
kits are available. Keep pipe or tubing lengths to a minimum
with inside clean and free of dirt and chips. Pipe joint
compound should be used sparingly and applied only to
the male pipe – never into the female port. Do not use
PTFE tape to seal pipe joints – pieces have a tendency to
break off and lodge inside the unit, possibly causing
malfunction.

2. Install regulator so that air flow is in the direction of arrow.
Installation must be on the upstream (high pressure) side
and as close to the devices it is to service (lubricator,
valve, cylinder or tool). Mounting may be in any position.

3. Gauge ports are located on both sides of the regulator
body for your convenience. It is necessary to install a
gauge or socket pipe plug into each port during installation.

WARNING

!

FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF
THE PRODUCTS AND/OR SYSTEMS DESCRIBED HEREIN OR
RELATED ITEMS CAN CAUSE DEATH, PERSONAL INJURY AND
PROPERTY DAMAGE.

This document and other information from The Company, its
subsidiaries and authorized distributors provide product and/or system
options for further investigation by users having technical expertise. It
is important that you analyze all aspects of your application, including
consequences of any failure and review the information concerning
the product or systems in the current product catalog. Due to the
variety of operating conditions and applications for these products or
systems, the user, through its own analysis and testing, is solely
responsible for making the final selection of the products and systems
and assuring that all performance, safety and warning requirements
of the application are met.

The products described herein, including without limitation, product
features, specifications, designs, availability and pricing, are subject
to change by The Company and its subsidiaries at any time without
notice.

EXTRA COPIES OF THESE INSTRUCTIONS ARE AVAILABLE FOR
INCLUSION IN EQUIPMENT / MAINTENANCE MANUALS THAT UTILIZE
THESE PRODUCTS. CONTACT YOUR LOCAL REPRESENTATIVE.

1/4" & 3/8" H12 Pilot Controlled Regulator 83-957-000

B. Servicing the Valve Assembly-

Service Kits Available

1. Exhaust system air pressure as previously described. Then
remove bottom cap by unscrewing it from body. Next,
remove valve assembly, o-ring, cap o-ring and valve return
spring.

2. Next, disassemble, clean, and carefully inspect parts for
wear and/or damage. If replacement is necessary, use
parts from service kits.

3. Lubricate o-ring and sliding surfaces using grease supplied
with service kit.

4. Install parts as shown in Figure 1.

5. Lubricate cap o-ring and install it in o-ring groove on cap.
Then screw cap into body until the cap bottoms out in
body (See Figure 1).

6. Turn on air supply and adjust to desired secondary pressure
as described in the Operation section.

Gauges:

Non-Relieving
Regulator Repair Kit*

Relieving Regulator
Repair Kit*

* Grease in kit is silicone free.

Description 1/4", & 3/8"

Low Pressure RRP-96-664
0 to 414 kPa (0 to 60 PSIG)

Low Pressure
0 to 207 kPa (0 to 30 PSIG)

Standard Pressure
0 to 1103 kPa (0 to 160 psig)

H12 Pilot Controlled Regulator

RRP-96-663

RRP-96-665

RRP-96-309

RRP-96-310

Turn on air pressure and check regulator for leakage. If leakage
occurs, DO NOT OPERATE — conduct repairs again.

If you have questions concerning how to service this unit,
contact your local authorized dealer or your customer service
representative.

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.

Collar
(Hand tight
plus 1/4 turn)

Bonnet

O-Ring

Piston

O-Ring,
Vent Seal

Body

Valve
Assembly

O-Ring,
Bottom Cap

Spring,
Valve Return

Figure 1

Bottom Cap
Torque:

2.3 to 2.8 Nm
(20 to 25 in. lb.)