LR-7225B
Revised 03-05
Catalog Section 15
(00-02-0063)
Maintain Lube Level
Model LR857
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Eliminates Under/OverFill Due to
“Human Error”
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■
■
■
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Simple Installation
Automatically Maintains Lube Level
Low Level Switch
Models to Fit Varied Applications
™
Positive Sealing Thumb-Valve
**
LR857
Description
Specifications
Simplified Drawing of
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.
Inlet Connection: 5/8 in. (16 mm) I.D. hose
Thumb-Valve Operation
Outlet Connection: 3/8 NPT
Thumb-Valve™
Snap-switch: SPDT rating 10 A @ 125 VAC;
FULL
Oil Inlet
0.5 A @ 125 VDC; 10 A @ 30 VDC.
Float
Conduit Connection: 1/2 NPT
Case: Die cast aluminum
Lens: Polycarbonate
Float: Brass
Action
LR857
Case
LOW
COM.
N.O.
N.C.
Low Level
Switch
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.
Flow Rates (see chart below):
Oil with 0.9 specific gravity @ 70°F (21°C)
9.73 psi
25
Fittings Kit: 15000420
The 15000420 kit is sold separately. It includes
the following items.
20
15
How the LR857
Maintains Levels
Quantity
Description
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.
1
1/4 in. (6 mm) O.D copper cane
10
tube (vent connection)
05
1
1
1/4 in. (6 mm) tube x 1/4 male
pipe fitting
Flow:
USGPM
0
0 psi
0
0.2500
0.5000
1/2 in. (13 mm) I.D. hose fitting
(outlet connection)
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.
Warranty
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.
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
**Products covered by this bulletin comply with EMC Council directive 89/336/EEC regarding electromagnetic compatibility except as noted.
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