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SUCTION VALVE UNLOADER ASSEMBLIES

 

Description

 

The Quincy suction valve unloader assembly consists of unloading assemblies on the suction valves, having a plunger to contact the suction valve reed and an unloader pilot valve (110832 or 110998 series) to automatically regulate the passing of air tank pressure to the unloading arrangement.

Continuous Run Operation

 

Suction valve unloader assemblies are recommended for use on Quincy compressors where the compressor is to run continuously and a constant pressure is to be maintained. The purpose is to automatically unseat the suction valve of the compressor when the air supply is greater than the demand.

Unloading occurs when air tank pressure is sufficient to overcome pilot valve spring pressure. The check ball is then unseated, allowing air tank pressure to pass to the unloader assemblies. The compressor will run unloaded until the air tank pressure drops to a predetermined level. At this time, the action of the ball is reversed, shutting off air tank pressure to the unloader assemblies and venting the unloader to atmosphere. This allows the compressor to load. The drive, either electric motor or engine, runs continuously and must be started and stopped manually. 110832 series pilot valves feature a toggle
lever which can be flipped to provide manual unloading.

Dual Control Operation

 

Dual control operation is designed to provide a choice between "start/stop" or "continuous run"operation. The 110998 series pilot valve can be set for "start/stop" operation by turning the knurled knob at the end of the pilot valve (refer to illustration for 110998 series pilot valve)clockwise until it stops. Under these circumstances, a pressure switch is required to stop the motor. Failure to use a pressure switch, with the pilot valve locked out, will result in unsafe conditions.

Installation

 

The pilot valve is mounted directly into the air tank. Compressors in the field, not equipped with these controls, can be converted. Consult your local Quincy distributor for assistance with conversion procedures.

Service

 

If a change inpilot valve operation is detected, remove the pilot valve from the air tank and check the screen in the inlet of the pilot valve for obstructions. Clean the screen if necessary.

Adjustment

 

The unloading pressure is adjustable and is regulated by turning the unload adjustment hex nut (refer to pilot valve illustrations). Turn the hex nut clockwise to increase and counterclockwise to decrease the unloading pressure. The differential (difference between unloading and loading pressure) is set by turning the differential adjustment hex nut (refer to pilot valve illustrations). Increase the differential pressure by turning the hex nut clockwise - decrease by turning counterclockwise. Make all adjustments in small increments. Tighten the locknuts after adjustment.

 

DECALS

Decals

Item

#

Qty

 

Part

Number

Description

 

1 1       110831 serial number & nameplate
2 1 127889-A decal, CAUTION!, MANUAL
3 1 127889-B decal, DANGER!,"Air from this...."

 

                                      WARNING !

A pressure switch must be incorporated whenever 110998
series pilot valve is employed as part of the control system.

 

The compressor will operate in the continuous run
mode if the knurled knob is turned counterclockwise
until it stops.

 Overhaul Kit KQT5FB
  (for gas engine driven models)

Item #

Qty

Part

Number

Description
1 111200 piston ring set
1 111199 piston ring set
1 114097-002 gasket set
1 113946X006 valve plate assembly
1 110377E100 air filter element
1 110190-013 piston pin
1 110190-014 piston pin
1 111333 crankcase breather
1 113936-001 connecting rod assembly, LP
1 113936-003 connecting rod assembly, HP
2 111105-001 piston pin plug, .88 dia
2 111105-002 piston pin plug, .62 dia

 

Head Kit KQT5AB
(for models without head unloaders)

Item #

Qty

Part

Number
Description
1 114096-002 replacement valve assembly
1 111146E100 air filter element

 

Head Kit KQT5CB
(for models with head unloaders)

Item #

Qty

Part

Number
Description
1 114096-002 replacement valve assembly
1 110377E075 air filter element

 

Head Kit KQT5EB
(for gas engine driven models)

Item #

Qty

Part

Number
Description
1 114096-002 replacement valve assembly
1 110377E075 air filter element

 

Overhaul Kit KQT5BB
(for models without head unloaders)

Item #

Qty

Part

Number
Description
1 111200 piston ring set
1 111199 piston ring set
1 114097-002 gasket set
1 113946X006 valve plate assembly
1 111146E100 air filter element
1 110190-013 piston pin
1 110190-014 piston pin
1 111333 crankcase breather
1 113936-001 connecting rod assembly, LP
1 113936-003 connecting rod assembly, HP
2 111105-001 piston pin plug, .88 dia
2 111105-002 piston pin plug, .62 dia

 

Gasket Set 114097-002

Item #

Qty

Part

Number
Description
1 113618-003 gasket, valve plate to head
1 113617 gasket, cylinder to valve plate
1 113943 gasket, crankcase to cylinder
1 113755 gasket, bearing carrier
1 111106-001 oil seal
6 114440-L23 hex. screw, 3/8-16 unc x 3.50
6 110428N038 flatwasher, 3/8
1 50278-101 head bolt torque instructions

 

Overhaul Kit KQT5DB
(for models with head unloaders)

Item #

Qty

Part

Number
Description
1 111200 piston ring set
1 111199 piston ring set
1 114097-002 gasket set
1 113946X006 valve plate assembly
1 111146E100 air filter element
1 110190-013 piston pin
1 110190-014 piston pin
1 111333 crankcase breather
1 113936-001 connecting rod assembly, LP
1 113936-003 connecting rod assembly, HP
2 111105-001 piston pin plug, .88 dia
2 111105-002 piston pin plug, .62 dia

 

Recommended Spare Parts

Item #

Qty

Part

Number
Description
1 110377E100 air filter element, (fits
110377S100 and 110377S101
air filters; optional
or    
1 111146E100 air filter element, (fits
111146F100 filter; for plain
heads)
or    
1 110377E075 air filter element, (fits 111549
filter, standard)
1 114097-002 gasket set
1 114096-002 replacement valve assembly
...
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