Dwyer Instruments MPR1, MPR2, MPR1-0, MPR2-0, MPR1-1 Installation, Operation And Maintenance Instructions

Dwyer Instruments, Inc.

Michigan City, IND. 46361
Phone [phone]
Fax [phone]

MPR1 / MPR2

Installation, Operation and
Maintenance Instructions

STOCKED MODELS

Ranges

0-5 psi

0-15 psi

0-30 psi

0-60 psi

0-100 psi

Accessories

Panel Mounting Nut

Mounting Bracket

SPECIFICATIONS

No. Part Description Material

1 Knob Acetal

2 Bonnet Acetal

3 Adjusting Screw Zinc-plated Steel

4 Adjusting Nut Zinc-plated Steel

5 Range Spring Zinc-plated Steel

Diaphragm Assembly*

7 Supply Seat* Acetal

8 Supply Seat O-Ring* Nitrile

9 Pintle* Aluminum/Nitrile

10 Pintle Spring* 300 Stainless Steel

11a Body (air) Zinc Alloy

11b Body (water) Electroless Nickel-plated

12 Pipe Plugs Steel

Items marked with an asterisk (*) are included in the repair kit.

Model Numbers

Relieving

MPR1-0

MPR1-1

MPR1-2

MPR1-3

MPR1-4

Non-Relieving

MPR2-0

MPR2-1

MPR2-2

MPR2-3

MPR2-4

Miniature P

ressure Regulator

Service: Compressed Air or Water

Maximum Inlet Pressure Standard Relieving: 250 psig

Maximum Inlet Pressure Non-Relieving: 150 ps

Temperature Range: 0 to 150° F

Inlet and Outlet: (2) 1/4" female NPT; (2) 1/8"

ig

female NPT gauge ports

Materials of Construction:

6 a, b

Acetal/Nitrile (relieving or non-relieving)

Dwyer Instruments MPR1/MPR2 Miniature Regulator

REPAIR KITS

Relieving Regulators

Non-relieving Regulators

INSTALLATION

1. System piping should be the same pipe size as regulator ports. Locate regulator as close as possible to the device
using regulated air/water. If cycling devices and/or lubricators are used in the piping system, install the regulator
upstream of these devices. A filter installed upstream of the regulator is recommended to maximize service life.

2. The arrow on the regulator body indicates direction of air/water flow. Connect piping to proper ports using pipe
sealant on male threads only. Do not allow sealant to enter interior of regulator. Regulator can be installed at any angle.

3. Two 1/8" NPT gauge ports are provided to allow for the connection of an outlet pressure gauge or as additional out­lets for regulated air/water. Plug unused gauge ports. Panel-mounted units require a 1-3/16" diameter hole with a
maximum panel thickness of 1/4".

ADJUSTMENT

1. Before turning on system air/water pressure, turn regulator knob counter-clockwise just until knob stops. Pull knob
outward to unlock and adjust pressure setting. Turn on system air/water pressure. Turn regulator knob clockwise
until outlet pressure reaches desired setting.

2. When changing pressure setting, always approach the desired pressure from a lower setting. For example, lowering
the outlet pressure from 80 psi to 60 psi is best accomplished by dropping the outlet pressure to 50 psi, then adjust­ing up to 60 psi.

3. Push knob inward to lock pressure setting.

MAINTENANCE

Air/water pressure must be shut off before attempting to install or disassemble regulator for servicing.

1. If air/water is kept clean, regulator should provide long periods of uninterrupted service. If erratic performance
occurs, it is likely that parts in the regulator need to be cleaned or replaced. See Repair Kits for the part number of
repair kits that can be ordered from Dwyer Instruments.

2. TO DISASSEMBLE: Reduce pressure in inlet and outlet lines to zero. Regulator can be serviced without removal
from line. Pull knob out to disengage lock, and turn knob counter-clockwise until it stops. This will remove any load on
the range spring. Unscrew bonnet. Adjusting screw and nut are not retained, and may fall out. Remove range spring
and diaphragm assembly. Unscrew supply seat (hex socket size is 9/16"), and remove pintle and pintle spring.

3. CLEANING: Clean parts in warm water and soap, then dry. Replace any damaged parts . Blow out the body pas­sages using clean, dry compressed air.

4. TO REASSEMBLE: Use exploded view on front page as a guide for the orientation and assembly of parts. Lubricate
O-ring on supply seat with quality O-ring grease. Tighten supply seat into body. Make sure pintle slides up and
down freely after tightening supply seat. Tighten bonnet onto body. Do not over-tighten, as it could strip bonnet

threads.

WARNING

1. Do not use these products where pressures and temperatures can exceed those listed under Specifications.

2. In relieving-type regulators, excess pressure is vented out of the regulator when there is an increase in downstream
pressure above the pressure setting. However, relief capacity is limited. If a sudden increase in downstream pressure
could rupture or malfunction downstream equipment, install a pressure-relief device downstream of the regulator.
The capacity of the relief device must satisfy the system requirements.

3. In non-relieving regulators, downstream pressure above the pressure setting does not relieve to atmosphere.
Another means of relieving must be provided, if necessary.

4. Before using these products with fluids other than air/water, for non-industrial applications, life-support systems, or
other applications not within published specifications, please consult Dwyer Instruments.

WARNING

Dwyer Instruments MPR1/MPR2 Miniature Regulator

541-622-054 5/17/17