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 shut-
down 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 fur-
ther oil flow.
The simple and unique Thumb-Valve is non-
clogging 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, provid-
ing immediate level compensation. At FULL
position, the float holds the valve closed. If the
clean oil supply is depleted and oil level contin-
ues 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
0
05
10
15
20
25
0
Flow:
USGPM
Head Pressure–Feet of Oil
Head Pressure–psi
0 psi
9.73 psi
0.2500 0.5000
COM.
N.O.
Low Level
Switch
LR857
Case
Float
Action
Oil Inlet
Thumb-Valve™
FULL
LOW
N.C.
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
