Graco Pneumatic Electric Lube Sentry Valve User Manual

Pneumatic/Electric
Lube Sentry Valve

PNEUMATIC LUBE SENTRY VALVE

OPERATION: Initiate lubricant flow from the lube pump serving the

divider valve or pump to point system (until flow has been established,
the electric or pneumatic circuit to the Lube Sentry must be bypassed).
Lubricant passing through the hydraulic section of the valve (See Figure
1 or 2) from port (1) to port (2) moves to piston (3) in the direction of the
arrow. The actuator rod (4) is attached to piston (3) and simultaneously
moves in the same direction allowing the directional spool (5) in the air
valve of the Pneumatic Lube Sentry (See Figure 1) to permit air to flow
between port “A” and port “C” or tripping the microswitch(es). (See Figure
2 Note 2 on the Electric Lube Sentry.) The Lube Sentry is now in a flow
position.

When lubricant flow stops, spring (6) returns piston (3) in the opposite
direction, closing the porting to the lube outlet (7). The lubricant ahead
of piston (3) is forced back through the adjustable needle valve (8) at a
controlled rate. As piston (3) returns to the right, the attached actuator rod
(4) moves the Pneumatic Lube Sentry directional spool (5) permitting air
to now flow between port “A” and port “B” (See Figure 1), or changing the
position of the microswitch(es) (See Figure 2 Note 2) on the Electric Lube
Sentry. The Lube Sentry is now in a no-flow condition. Figure 1 shows a
typical no-flow position.

Adjusting needle valve (8) clockwise increases shutdown time. A
counterclockwise adjustment decreases the shutdown time.

Note 1: Pneumatic Valve Operation (During Lubricant Flow)

ELECTRIC LUBE SENTRY VALVE

Flow - Green Light - ON; Red Light - OFF

No-Flow - Red Light - ON; Green Light - OFF

Operation Port “A” Port “B” Port “C”

Norm. Open Air In Plugged Air Out

Norm. Closed Air Out Air In Plugged

Figure 1. Pneumatic Lube Sentry Valve Figure 2. Electric Lube Sentry Valve

Note 2:

FLOW CONDITION :

For Closed Contact: Use Red and Blue Wires (Red Common)
For Open Contact: Use Red and White Wires (Red Common)

NO-FLOW CONDITION:
For Open Contact: Use Red and Blue Wires (Red Common)
For Closed Contact: Use Red and White Wires (Red Common)

CAUTION: If only two of the three wires are used, tape un-used wire.

Manzel® Pneumatic/Electric Lube Sentry Valve

INSTALLATION

General Lube Line Connection

The Lube Sentry Valve should be located in the lube line 1.
downstream of pump, filters, and controls, but ahead of the
master divider valve. (A high-pressure line filter placed after
the pump is insurance against system plugging due to oil-born
dirt.)

A pressure rupture assembly (Disk Relief Type) must be located 2.
in the main lube line between the pump and the line filter.

Always install Lube Sentry with “LUBE OUT” port up, to permit 3.
natural air purging of the device.

General Shutdown Reaction Adjustment

See graphs for minimum flow rates, with various viscosity oils, 1.
and shutdown time recommendations.

Start with the adjustment screw (Figures 1 & 2, Item 8) 2.
flush with end of housing. Turn on lube system with pump
discharging oil at normal flow rate and pressure.

45425

NOTE: Do not use below minimum recommended

flow rates or inconsistent shutdown times occur.

Graph 1. Minimum Flow Rate

Slowly rotate adjustment screw clockwise until the electric 3.
switch/air valve changes mode (flow condition).

Stop oil flow and note time for electric switch air valve to 4.
change mode (no-flow condition).

Start normal flow of oil and note that the electric switch/air 5.
valve changes mode (flow condition) within two minutes and
remains in this mode as long as normal oil flow continues.

For positive shutdown indication on the Electric Lube Sentry, 6.
an ohmmeter or continuity meter should be connected to
wiring as follows: No flow condition – continuity between red
and white wires. Flow condition – continuity between red and
blue wires. Caution – In an explosive atmosphere, use only
approved device for checking continuity

This is the minimum shutdown time attainable for the 7.
application. The shutdown time can be increased by continuing
to turn the adjustment screw clockwise. Caution – Do not
adjust shutdown time greater than shown on graphs or
inconsistent shutdown time will result.

Pneumatic Lube Sentry Valve Installation

Pneumatic Connections

Series Type (in-line) Safety Control Pneumatic CircuitsA. (See

Figure 3)

Trace pneumatic safety circuits from the source of its take-off 1.
air supply through the various safety devices used on the
engine and compressor to the entrance of the pilot air port
(bonnet port) on the safety control valve or gas shut-off valve.

Select the most convenient location to break into the air circuit, 2.
either between two other safety devices or between the last
safety device and the bonnet port of the safety control valve.

NOTE: At minimum flow rate, the shutdown time is not
adjustable. Times indicated are approximate results when
the attached procedure is followed. Attempting to increase
the shutdown time will result in inconsistent shutdown time.

Graph 2. Minimum Shutdown Time

Break the air circuit at the selected point and tube the Lube 3.
Sentry Valve into the circuit with air flow entering port “A” and
leaving port “C” (See Figure 1). If gas is used as the control
medium rather than air, tube the exhaust port “B” into a
suitable vent line.

CAUTION – Never plug port in series type shutdown circuits.

To test device for operation, start engine to initiate flow in the 4.
divider valve system. Operation of the air valve within the Lube
Sentry will be observed as the tripping out of the reset latch
(manual override) lever on the safety control valve (see Figure

3), and the continued operation of the engine.

After a short interval of running during which the engine and
compressor receive sufficient lubrication and all other safety
devices move to the RUN position, dump the output of the
pumps serving the divider valve systems by removing the
pump blowout disc or a pipe plug from the pump manifold
assembly. When the flow to the distribution system stops,
the Lube Sentry should operate to dump the pressure in the
pneumatic safety circuit, dropping out the safety control valve
to stop the engine. (If shutdown action is sluggish, reduce the
setting of the adjustable orifice through which air for the safety
circuit passes.

Page 2

Manzel

®

Pneumatic/Electric Lube Sentry Valve

45425

The Lube Sentry is provided with a 1/8” air valve. If the control orifice for
the safety system is too large, air will be supplied to the Lube Sentry too
quickly to permit it to dump properly.)

A pneumatic relay may be operated by the Lube Sentry (see Figure 4).

Parallel Type Safety Control Pneumatic CircuitsB. (See Figure 5)

Parallel type safety circuits rely on their devices to dump the 1.
pilot control pressure on the safety control valve in case of
trouble. This control pressure is supplied to the pilot (bonnet)
port of the safety shutdown valve through an adjustable orifice
which permits enough air to enter the circuit to maintain
pressure on the port. When any safety device operates, the
pilot pressure is dumped, with the control orifice preventing
sufficient air to enter the system to maintain pressure.

The Lube Sentry should be teed in to the line serving the pilot 2.
port of the safety shutdown valve.

Connect port “B” into the safety circuit.3.

Plug port “C”.4.

Port “A” (exhaust) may be connected to a vent line if necessary.5.

To test device for operation see item 4 under Series Type.6.

Electric Lube Sentry Valve Installation

Electric Switch Adjustment and Replacement

The electrical end of the Lube Sentry has been adjusted correctly at the
factory. If the electric switch assembly is replaced, repairs required or
adjustment necessary, proceed as follows:

housing, consisting of conduit elbow and cap, nipple, and
adaptor by loosening and removing the adaptor, (Figure 7, Item

31) from the switch housing.

Loosen setscrew (Item 26) located on bottom of switch body.3.

Actuating piston must be completely extended (Item 15).4.

Rotate switch enclosure screw (Item 23) clockwise until switch 5.
just actuates. (Continuity is obtained between red and white
wires.) Rotate additonal 1/4 turn after switch actuates.

Tighten setscrew (Item 26) to lock nylon ball (Item 25) against 6.
switch enclosure screw.

If microswitch is defective, replace.7.

Re-adjust switch. 8.

Figure 3. Typical Series Installation of

Pneumatic Engine Shutdown Circuit

Warning: Never remove the Lube Sentry Electric Switch Assembly from

the Actuator Assembly or make any adjustments to the Electric Switch
without first being sure there is NO Electricity Present at the Lube
Sentry.

To Replace Electric Switch Assembly

After determining there is no electricity to the Lube Sentry, 1.
remove the switch assembly from the actuator assembly
by removing the four-socket head screws holding the two
assemblies together, being careful not to scratch the mating
surfaces.

Be sure no corrosion or dirt is present. In a no-flow condition, 2.
the actuator rod should extend approx. 5/32 inches beyond the
actuator rod housing.

Replace electric switch assembly. 3. Caution: Do not reassemble
if scratches, dirt, or corrosion are present on mating surfaces
of switch and actuator assembly.

To Adjust Electric Switch Assembly

With no lubricant flowing, Lube Sentry should be in shutdown 1.
or warning position (switch actuated). You should show
continuity between red and white wires, if not, the microswitch
is misadjusted or broken.

If adjustment is required, remove the electrical connection 2.

Figure 4. Typical Installation with

Pneumatic Indicating Relay

NOTE: Installation of the Pneumatic Lube Sentry as shown on

the drawing provides automatic signalling of cylinder lubrication
trouble. No flow caused by pump failure, broken line or low
oil supply will cause the Lube Sentry to operate, removing air
pressure from the fuel valve and stopping the engine.

Figure 5. Typical Parallel Gas Engine Installation of Lubriquip

Pneumatic Lube Sentry with Fulton-Sylphon No. 530

Pneumatic Pilot Valve

Page 3

Ordering Information

Description Part No. Old Part No.

Pneumatic Lube Sentry, Complete 563506 527-100-190

Pneumatic Valve 563503 527-100-150

Actuator 563502 527-100-130

Electric Lube Sentry, Complete 563505 527-100-180

Switch Assembly 563504 527-100-170

For more information on the Pneumatic or Electric Lube Sentry Valve consult Literature L15831

Figure 6. Actuator Assembly

Item Description Part No. Old Part No. Qty.

1 Lube Sentry Actuator Assembly 563502 527-100-130 1

2 Body (Matched Fit)• 560999 527-100-000 1

3 Piston (Matiched Fit)• 561000 527-100-010 1

4* Valve - Adjustment• 561005 527-100-062 1

5* Housing Adjustment Screw• 561004 527-100-052 1

6* O-Ring, Viton, 70 Duro• 556560 422-041-140 2

7* O-Ring, Viton, 70 Duro• 556551 422-040-060 1

8* Back-Up Ring• 557719 527-000-760 2

9* O-Ring• 556554 422-040-110 1

10* Setscrew, 1/4-20 x 1/4 Hex• 555531 417-060-020 1

11* Ball, 3/16, Steel• 556328 401-030-030 1

12* Spring-Piston Return• 557753 527-100-110 1

13* O-Ring• 556557 422-040-140 1

14* Spacer, O-Ring Retaining• 561009 527-100-100 1

15* Piston-Switch Actuating• 561002 527-100-030 1

16* Locking Screw, 3/8-24 x 3/16• 556470 416-700-780 1

17* Back-Up Ring• 556584 423-700-038 1

18* O-Ring• 556553 422-040-080 1

19 Screw - Piston Enclosure• 561003 527-100-040 1

20 Houseing - 5 W. Act. Piston• 561001 527-100-020 1

– Adjustment Screw & Housing Only 564405 527-100-370 1

* Actuator Assembly Repair Kit 564436 560-001-130 1

Figure 7. Switch Assembly for Electric Lube Sentry

Item Description Part No. Old Part No. Qty.

22 Switch Assembly - Electric Lube Sentry 563504 527-100-170 1

23* Switch Enclosure Screw• 557355 503-680-000 1

24* Microswitch Assembly• 557757 527-100-210 1

25* Nylon Ball, 5/32 in.• 555781 504-706-000 1

26* Setscrew, 10-32 x 3/8 in.• 556476 417-450-040 1

27* Round Head Screw• 555496 416-010-070 2

28* Int. Lockwasher• 555631 421-070-010 2

29* Socket Head Srew, 1/4-20 x 1-3/4• 556510 419-130-090 4

30 Switch Housing• 561008 527-100-090 1

31 Adapter• 557356 503-681-000 1

32 Conduit Elbow w/Nipple• 557384 507-912-000 1

* Electric Switch Assembly Repair Kit 563908 560-001-120 1

Figure 8. Valve Assembly for Pneumatic Lube Sentry

Item Description Part No. Old Part No. Qty.

22 Valve Assembly - Pneumatic Lube Senry 563503 527-100-150 1

23* O-Ring, 70 Duro• 555690 422-041-200 1

24* O-Ring, 70 Duro• 555685 422-040-220 1

25* Air Valve Spring• 557353 503-658-000 1

26* Valve Cartridge• 557354 503-659-000 1

27* Spring Guide• 561011 527-100-320 1

28* Socket Head Screw, 1/4-20 x 1-3/4• 556510 419-130-090 4

29 Air Valve Housing• 561006 527-100-070 1

30 Air Valve Enclosure Screw• 561007 527-100-080 1

* Pneumatic Lube Sentry Repair Kit 563907 560-001-110 1

Specifications

Material Steel

Max Pressure 6,000 psi (414 bar)

(1) Flow Rate (per day) 4 - 400 pints (1.89 - 189.2 liters)

Pressure Drop 250 psi (17 bar)

Seals Viton

(1) Lubricant Oil (450 - 2,000 SUS)

Net Weight 5 lb (2.265 kg)

All written and visual data contained in this document are based on the latest product information available at the time of publication. Graco reserves the right to make changes at any time without notice.

Operating Temperature -20ºF to 180ºF (-29ºC to 82ºC)

Max Air Pressure (Pneu.) 125 psi (8 bar)

Elecrical Rating 1) 5 amps @ 125/250 VAC

(1) Ref to Graph 1

2) A, B or C @ 28 VDC
(A) Inductive - 3 amp
(B) Resistive - 5 amp
(C) Max Inrush - 15 amp

Contact us today!

To receive product information or talk with a Graco representative,
call 800-533-9655 or visit us online at www.graco.com.

©2006-2009 Graco Inc. Form No. L45425 Rev. B 7/09 Printed in U.S.A. All other brand names or marks are used for identification purposes and are trademarks of their respective owners. All written and
visual data contained in this document are based on the latest product information available at the time of publication. Graco reserves the right to make changes at any time without notice.