Murphy LR857 User Manual

Model LR857

■

Eliminates Under/OverFill Due to
“Human Error”

■

Simple Installation

■

Automatically Maintains Lube Level

■

Low Level Switch

■

Models to Fit Varied Applications

■

Positive Sealing Thumb-Valve

™

LR857

Description

Murphy LR857 Lube Level Regulator maintains
the crankcase oil level of an engine, pump or
compressor. Adjusted to the correct running-oil-
level, the LR857 will replenish oil as it is used. An
integral, low-level switch will alarm and/or shut­down the equipment if supply oil is lost and the
equipment continues to use oil.

Application

The LR857 maintains oil level on any size engine,
but is recommended for small to medium volume
applications and installations that require a 3-wire,
snap-action switch.

How the LR857
Maintains Levels

As crankcase oil level drops, the LR857 float also
drops and opens the Thumb-Valve.™ This allows
oil to flow from the supply tank, through the
LR857, and into the crankcase. When proper
level is attained in the crankcase, the LR857 float
rises, causing the Thumb-Valve to close off fur­ther oil flow.

The simple and unique Thumb-Valve is non­clogging and provides a positive, leak-free seal.

Flow rate through the 1/8 inch (3 mm) orifice is
significant to allow crankcase refill through
the LR857.

Specifications

Inlet Connection: 5/8 in. (16 mm) I.D. hose

Outlet Connection: 3/8 NPT

Snap-switch: SPDT rating 10 A @ 125 VAC;

0.5 A @ 125 VDC; 10 A @ 30 VDC.

Conduit Connection: 1/2 NPT

Case: Die cast aluminum

Lens: Polycarbonate

Float: Brass

Flow Rates (see chart below):

Oil with 0.9 specific gravity @ 70°F (21°C)

Thumb-Valve Operation

As the equipment uses oil, the float falls, provid­ing immediate level compensation. At FULL
position, the float holds the valve closed. If the
clean oil supply is depleted and oil level contin­ues to fall, the low level switch will operate an
alarm or equipment shutdown.

Fittings Kit: 15000420

The 15000420 kit is sold separately. It includes
the following items.

Quantity Description

1 1/4 in. (6 mm) O.D copper cane

tube (vent connection)

1 1/4 in. (6 mm) tube x 1/4 male

pipe fitting

1 1/2 in. (13 mm) I.D. hose fitting

(outlet connection)

Warranty

A limited warranty on materials and workmanship is
given with this FW Murphy product. A copy of the
warranty may be viewed or printed by going to
www.fwmurphy.com/support/warranty.htm

Simplified Drawing of
Thumb-Valve Operation

**Products covered by this bulletin comply with EMC Council directive 89/336/EEC regarding electromagnetic compatibility except as noted.

**

LR-7225B

Revised 03-05

Catalog Section 15

(00-02-0063)

Maintain Lube Level

9.73 psi

0 psi

25

20

15

10

Head Pressure–psi

05

Head Pressure–Feet of Oil

0

0

Thumb-Valve™

FULL

Float

Action

LOW

COM.

N.O.
N.C.

Flow:
USGPM

0.2500 0.5000

LR857
Case

Low Level
Switch

Oil Inlet

LR857 Typical
Installation

4.50 in.

)

5.20 in.

(132 mm)

.

(

)

(

.

1/4-20 NC

2 places

.

(

)

2 places

How to Order

Specify model LR857

Accessories (Specify part number)

Description Part Number

Fittings Kit 15000420
Pipe Bracket Kit 15000238
Universal Flange Kit 15010224

Replacement Parts (Specify part number)

Inlet Valve Assembly 15000159
Glass and Switch Ass'y 15000100
Lid Assembly 15000161
Float Assembly (Brass-std) 15000941

LR857 Shipping Dimensions: 9 x 5-1/2 x 6 in. (229 x 140 x 152 mm).

LR857 Shipping Weight: 3 lbs. 6 oz. (1.5 kg).

Mounting Brackets with Hardware

Murphy offers two mounting brackets for the LR857. The 15000238 Pipe
Bracket Kit fits a 7/8 in. (22 mm) diameter pipe (see typical installation
below). The 15010224 universal Flange Kit allows various mounting methods.

Dimensions

15000238

Pipe Bracket Kit

15010224

Universal Flange Kit

Additional Hardware Supplied

(2) 1/4-20 x 7/8 inch

(22 mm) screws

(2) 1/4-20 x 1 inch

(25 mm) screws

(4) 1/4-20 hex nuts
(4) 1/4 inch (6 mm)

dia. split washer

Additional Hardware Supplied

(2) 1/4-20 x 1-1/4 inch

(32 mm) bolts

(4) 1/4 dia. flat washer
(2) 1/4-20 hex nuts
(2) 5/16-18 x 1-1/4 inch

(32 mm) bolts

(4) 5/16 dia. flat washer
(2) 5/16-18 hex nuts

LR-7225B page 2 of 2

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]
e-mail [e-mail]

MURPHY DE MEXICO, S.A. DE C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
[phone] fax [phone]
Villahermosa Office [phone]
e-mail [e-mail]
www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [e-mail]
www.fwmurphy.co.uk

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.

FW Murphy

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone] fax [phone]
e-mail [e-mail]

www.fwmurphy.com

Printed in U.S.A. 850740B

4-15/16 in.

(125 mm)

1/2 NPT
Electrical
Conduit
Connection

3/8 NPT
Outlet
Connection

Test

Knob

4-1/2 in.
(114 mm)
Mounting Holes

2-25/32 in.

(71 mm)

1/4 NPT

4-13/16 in.

(122 mm)

Plug



1/2 NPT

5/8 in. (16 mm)
I.D. Inlet Hose
Connection
1/4 NPT Internal
Threads

9/32 in. (7 mm)
Diameter Holes
2 places

Plug
3/8 NPT

(114 mm

.376 in

10 mm
minimum
bottom surface

Hole .88 in.

22 mm) dia

Slot, .390 in. (10 mm)
x 2 in. (51 mm)
4 places

Slot, .390 in. (10 mm)
x 4.71 in. (120 mm)
3 places

(114 mm)

5.19 in.

(132 mm)

2.50 in
64 mm

4.50 in.

6.69 in.

(170 mm)

1.75 in.

(44 mm)

7.50 in.
(191 mm)

For vented crankcase use the
cane vent. For sealed
systems, vent must be
piped back to crankcase,
above oil level.

LR857

Electrical

Conduit
Wire to
switch
circuits

Oil Outlet

CLEAN Oil Supply Tank.
Height above LR recommended
2 ft. (0.6 m) minimum and
25 ft. (7.7 m) maximum

Shutoff
Valve

Crankcase

Oil
Inlet

NOTE: LR857 shown mounted
using a pipe bracket.