Quincy Compressor QSVI Series

Questions and Answers

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Brian WalkerNov 25, 2025
Why is my Quincy Compressor Water Pump showing poor process pressure?
- H
  hmorseNov 25, 2025
  Poor process pressure in your Quincy Compressor Water Pump can stem from various factors: * Leaks: Perform a leak check of the system and compare it to the original rate of rise pressure test. Look for damaged gaskets and leaks in check/isolation valves, the inlet valve, and piping to the airend. * Cold pump: Allow sufficient warm-up time for the pump to reach its operating temperature. * Low fluid level: Replenish the fluid reservoir to the correct level. * Fluid contamination or condensation: Replace the pump fluid. * Shaft seal leak: Replace the shaft seal. * Drive motor RPM too low: Check and replace the motor if needed. * Excessive back pressure/separator clogged: Replace the separator element and ensure the exhaust remains at atmospheric pressure. * Increasing system...
S
smithlisaNov 27, 2025
What causes frequent air/fluid separator clogging in my Quincy Compressor?
- R
  Robert AlvarezNov 27, 2025
  Frequent air/fluid separator clogging in your Quincy Compressor can arise from: * A faulty inlet filter or one that's inadequate for the environment: Replace faulty inlet filter elements. * A faulty fluid filter: Replace the fluid filter element. * Fluid breakdown: Address this by following the instructions in the “Fluid Breakdown” section of the troubleshooting guide. * Using an incorrect fluid separator element: Only use genuine Quincy replacement elements. * Extreme operating conditions: Ensure the vacuum pump operates at the recommended reservoir pressure and air discharge temperature. * Fluid contamination: Change the fluid and promptly service the inlet filter element and fluid filter according to the recommended maintenance schedule. * Too high fluid level in the rese...
H
heatherwilliamsDec 1, 2025
What causes poor pumping speed in my Quincy Compressor Water Pump?
- R
  Ricky VazquezDec 1, 2025
  Poor pumping speed (capacity) in your Quincy Compressor Water Pump can be attributed to: * Clogged inlet filter: Replace the inlet filter element. * Narrow or restricted intake line: Re-plumb any narrow sections or sections with sharp turns in the intake line. Maintain the pump inlet diameter as far into the process as possible and check for obstructions. * Lubrication system problem: Check for adequate fluid flow rate and any restrictions in the fluid piping. * Excessive back pressure/separator clogged: Replace the separator element and keep the exhaust at atmospheric pressure. * Low fluid level: Fill the fluid reservoir to the proper level. * Condensation or contamination in fluid: Replace the pump fluid. * Cold pump: Allow adequate warm-up time for the pump to reach opera...
G
Gary BerryDec 1, 2025
What to do if the inlet valve on my Quincy Compressor QSVI Water Pump isn't opening or closing correctly?
- J
  Joseph JeffersonDec 1, 2025
  If the inlet valve on your Quincy Compressor Water Pump isn't opening or closing in relation to system demand: * Check and adjust the vacuum pressure switch to the proper setting, or replace it if faulty. * Inspect the inlet valve piston and cylinder bore; repair or replace as needed. * Inspect the air inlet valve bushing and shaft; also, check the piston and cylinder bore. Repair or replace components as necessary. * Repair or replace the faulty differential pilot valve, solenoid valve, or shuttle valve as needed. * Replace a broken spring in the air inlet valve. * Check and tighten wiring terminals at the solenoid valve/pressure switch if they are loose. * Adjust the pressure switch to the proper setting if the vacuum switch setting is incorrect. * Replace the switch if ...

Quincy Compressor QSVI Series Specifications

General

Brand	Quincy Compressor
Model	QSVI Series
Category	Water Pump
Language	English

Summary

Standard Warranty

Safety Hazard Symbols

DANGER

Immediate hazards resulting in severe personal injury or death.

WARNING

Hazards or unsafe practices resulting in personal injury or death.

CAUTION

Hazards or unsafe practices resulting in minor personal injury, product, or property damage.

Section 1 - General

Safety Precautions

Essential safety precautions for operating vacuum pumps and systems.

Installation Hints for Vacuum Service

Guidelines for properly installing QSVI vacuum pumps to ensure optimal performance.

Section 2 - Description

QSVI Vacuum Pumps

Overview of QSVI rotary screw vacuum pumps, their design, and components.

Principles of Vacuum Pump Operation

Explanation of how QSVI vacuum pumps function to create vacuum.

Air Flow

Describes the path and process of air through the vacuum pump system.

Fluid Flow & Cooling System

Details the circulation of fluid for lubrication, sealing, and cooling in the pump.

Fluid Coolers

Explains the function and types of heat exchangers used for fluid cooling.

Air;Fluid Reservoir & Air;Fluid Separator Element

Describes the reservoir and separator element's role in fluid management.

Auto Dual With Modulation

Explains the dual control mode for pump operation and modulation.

Auto Demand-Optional

Details the optional Auto/Demand control feature for multiple pump systems.

Electrical System

Overview of the pump's electrical components, wiring, and voltage considerations.

Indicators & Gauges

Explains the purpose and function of various indicators and gauges on the pump.

Section 3 - Installation

Receiving

Procedures for inspecting the vacuum pump upon delivery for damage.

Moving the Unit to the Installation Site

Guidelines for safely moving the vacuum pump unit.

Location

Recommendations for selecting an appropriate installation site for the pump.

Piping Connections

Proper methods for connecting piping to the vacuum pump system.

Piping Fit Up

Instructions for ensuring piping alignment and preventing strain on connections.

Pressure Relief Valves

Importance of correctly sized pressure relief valves for system safety.

Electrical

Requirements for electrical supply, wiring, and grounding during installation.

Pneumatic Circuit Breakers or Velocity Fuses

Notes on pneumatic circuit breakers or velocity fuses for protection.

Guards

Emphasizes the need for guards to be in place for safety.

Water Piping

Guidelines for water piping size and flow for cooling systems.

Cooling Water

Recommendations for water quality and maintenance for water-cooled units.

Safety Labels;Decals

Importance of maintaining safety labels and decals for hazard awareness.

Instruction Manual

The necessity of keeping the instruction manual accessible and up-to-date.

Induction System

Guidance on selecting and installing proper inlet filtration systems.

Fluid Level

Procedures for checking and maintaining the correct fluid level in the reservoir.

Vacuum Pump Rotation

How to check and ensure correct rotational direction of the vacuum pump.

Phase Monitor

Explanation of the optional phase monitor for electrical protection.

Section 4 - Procedures

Prior to Starting

Checklist of essential steps before starting the vacuum pump unit.

Starting the Vacuum Pump

Steps for safely starting the vacuum pump and initial checks.

Stopping the Vacuum Pump- Normal Operations

Procedure for normal shutdown of the vacuum pump unit.

Stopping the Vacuum Pump- Emergency Operation

How to perform an emergency shutdown of the vacuum pump.

Section 5 - Maintenance or Service Preparation

Preparing for Maintenance or Service

Procedures for safely preparing the pump for maintenance or service.

Section 6 - Servicing

Safety

Critical safety procedures for personnel performing service on vacuum pumps.

Lubrication

Details on the type of fluid used and its lubrication properties.

Fluid Specifications

Recommended fluid type and specifications for Quincy QSVI pumps.

Fluid Life

Information on the expected lifespan of the fluid and analysis services.

Understanding the Analysis Report

How to interpret fluid analysis reports for pump health monitoring.

Vacuum Pump Fluid Filter

Maintenance and replacement procedures for the fluid filter.

Vacuum Pump Air;Fluid Separator Element

Guidelines for changing the air/fluid separator element.

Fluid Scavenging System

Proper operation and maintenance of the fluid scavenging system.

Inlet Air Filter

Servicing and replacement of the inlet air filtration system.

Vacuum Pump Shaft Fluid Seal

Information on the shaft seal, its function, and replacement.

Preparation for New Seal Installation

Steps to prepare for installing a new vacuum pump shaft seal.

Seal Installation

Procedures for correctly installing the shaft seal assembly.

Section 7 - Service Adjustments

Differential Pilot Valve

Adjusting the pilot valve for desired system modulation and vacuum levels.

Vacuum Switch

Setting the vacuum switch for pump load and unload points.

Water Temperature Regulating Valve

Adjusting the water regulating valve for optimal fluid temperature.

Coupling Alignment

Importance and procedure for checking and correcting motor-pump alignment.

Correcting Angular Misalignment

Steps to correct angular misalignment of the pump and motor.

Parallel Misalignment Viewed From the Side

Method for checking parallel misalignment from the side view.

Angular Misalignment Viewed From the Top

Method for checking angular misalignment from the top view.

Water-Cooled Heat Exchanger

Maintenance of water-cooled heat exchangers to prevent issues.

Section 8 - Trouble Shooting

FAILURE TO START

Common causes and solutions for the pump failing to start.

POOR PROCESS PRESSURE

Diagnosing and resolving issues related to poor process pressure.

POOR PUMPING SPEED (Capacity)

Identifying causes for reduced pumping speed and capacity.

HIGH DISCHARGE TEMPERATURE AND;OR HIGH FLUID TEMPERATURE

Troubleshooting high temperature issues in discharge or fluid.

FREQUENT AIR;FLUID SEPARATOR CLOGGING

Addressing recurring clogs in the air/fluid separator.

INLET VALVE NOT OPERATING OR CLOSING IN RELATION TO DEMAND

Issues with the inlet valve's response to system demand.

VACUUM PUMP DOES NOT LOAD WHEN VACUUM LINE PRESSURE RISES

Problems with the pump loading based on vacuum line pressure.

UNSCHEDULED SHUTDOWN

Troubleshooting steps for unexpected pump shutdowns.

THERMAL OVERLOADED RELAYS TRIPPING

Causes and solutions when thermal overload relays trip.

VACUUM PUMP WILL NOT TIME-OUT AND SHUT DOWN WHEN UNLOADED

Troubleshooting when the pump fails to time out and shut down.

TOO RAPID CYCLING BETWEEN LOAD AND UNLOAD

Identifying causes for frequent cycling between load and unload states.

FREQUENT FLUID FILTER CLOGGING

Addressing recurring clogs in the fluid filter.

UNIT OPERATING WITH HIGH DISCHARGE TEMPERATURES

Diagnosing and resolving high discharge temperatures during operation.

EXCESSIVE FLUID CONSUMPTION

Troubleshooting causes for high fluid consumption by the pump.

FLUID SURGES INTO VACUUM LINE AFTER SHUT-DOWN

Issues with fluid surging into the vacuum line post-shutdown.

FLUID IS CLOUDY AND PUMP RUNS HOT

Causes and solutions when pump fluid is cloudy and the pump runs hot.

O-RING FITTINGS

Installation Instructions (SAE Straight Thread O-Ring Fitting)

Step-by-step guide for installing SAE straight thread O-ring fittings.

Section 9 - MAINTENANCE SCHEDULE

Periodically;daily - 8 hours maximum

Daily checks including gauges, fluid level, leaks, noise, and safety valve.

Weekly

Weekly maintenance tasks like servicing the air filter.

Monthly

Monthly tasks such as cleaning fluid cooler fins and wiping the unit.

6 months or every 1000 hours

Semi-annual or 1000-hour maintenance including fluid filter, strainer, and bolt checks.

Periodically;Yearly

Annual tasks like changing the fluid separator, inlet filter, and lubricating motors.

6000 hours or as fluid analysis program directs

Maintenance based on fluid analysis, including fluid changes.

Two Years

Replacement of cooler hoses after two years.

Technical Data Sheet: QSVI 25

General Specifications

Key operational and physical characteristics of the QSVI 25 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 25 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 25.

Water-Cooled Data

Specifications related to water cooling for the QSVI 25.

Sound Level

Noise levels for the QSVI 25 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 25 unit.

Technical Data Sheet: QSVI 40

General Specifications

Key operational and physical characteristics of the QSVI 40 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 40 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 40.

Water-Cooled Data

Specifications related to water cooling for the QSVI 40.

Sound Level

Noise levels for the QSVI 40 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 40 unit.

Technical Data Sheet: QSVI 50

General Specifications

Key operational and physical characteristics of the QSVI 50 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 50 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 50.

Water-Cooled Data

Specifications related to water cooling for the QSVI 50.

Sound Level

Noise levels for the QSVI 50 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 50 unit.

Technical Data Sheet: QSVI 75

General Specifications

Key operational and physical characteristics of the QSVI 75 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 75 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 75.

Water-Cooled Data

Specifications related to water cooling for the QSVI 75.

Sound Level

Noise levels for the QSVI 75 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 75 unit.

Technical Data Sheet: QSVI 100

General Specifications

Key operational and physical characteristics of the QSVI 100 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 100 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 100.

Water-Cooled Data

Specifications related to water cooling for the QSVI 100.

Sound Level

Noise levels for the QSVI 100 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 100 unit.

Technical Data Sheet: QSVI 200

General Specifications

Key operational and physical characteristics of the QSVI 200 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 200 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 200.

Water-Cooled Data

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Table of Contents

Questions and Answers

Quincy Compressor QSVI Series Specifications

Summary

Standard Warranty

Safety Hazard Symbols

DANGER

WARNING

CAUTION

Section 1 - General

Safety Precautions

Installation Hints for Vacuum Service

Section 2 - Description

QSVI Vacuum Pumps

Principles of Vacuum Pump Operation

Air Flow

Fluid Flow & Cooling System

Fluid Coolers

Air;Fluid Reservoir & Air;Fluid Separator Element

Auto Dual With Modulation

Auto Demand-Optional

Electrical System

Indicators & Gauges

Section 3 - Installation

Receiving

Moving the Unit to the Installation Site

Location

Piping Connections

Piping Fit Up

Pressure Relief Valves

Electrical

Pneumatic Circuit Breakers or Velocity Fuses

Guards

Water Piping

Cooling Water

Safety Labels;Decals

Instruction Manual

Induction System

Fluid Level

Vacuum Pump Rotation

Phase Monitor

Section 4 - Procedures

Prior to Starting

Starting the Vacuum Pump

Stopping the Vacuum Pump- Normal Operations

Stopping the Vacuum Pump- Emergency Operation

Section 5 - Maintenance or Service Preparation

Preparing for Maintenance or Service

Section 6 - Servicing

Safety

Lubrication

Fluid Specifications

Fluid Life

Understanding the Analysis Report

Vacuum Pump Fluid Filter

Vacuum Pump Air;Fluid Separator Element

Fluid Scavenging System

Inlet Air Filter

Vacuum Pump Shaft Fluid Seal

Preparation for New Seal Installation

Seal Installation

Section 7 - Service Adjustments

Differential Pilot Valve

Vacuum Switch

Water Temperature Regulating Valve

Coupling Alignment

Correcting Angular Misalignment

Parallel Misalignment Viewed From the Side

Angular Misalignment Viewed From the Top

Water-Cooled Heat Exchanger

Section 8 - Trouble Shooting

FAILURE TO START

POOR PROCESS PRESSURE

POOR PUMPING SPEED (Capacity)

HIGH DISCHARGE TEMPERATURE AND;OR HIGH FLUID TEMPERATURE

FREQUENT AIR;FLUID SEPARATOR CLOGGING

INLET VALVE NOT OPERATING OR CLOSING IN RELATION TO DEMAND

VACUUM PUMP DOES NOT LOAD WHEN VACUUM LINE PRESSURE RISES

UNSCHEDULED SHUTDOWN