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Liquid Controls PT Series - User Manual

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Installation, Operation
& Maintenance Manual
PT-Series Petroleum Pumps
For Refined Petroleum Products and Industrial Solvents
LIQUID CONTROLS GROUP
Model PT30
Model PT25 with optional air
operated valve (AOV) and strainer
Model PT20
Warning: (1) Periodic inspection and maintenance of Liquid Controls Group products is essential. (2) Inspection, maintenance and
installation of Liquid Controls Group products must be made only by experienced, trained and qualified personnel. (3) Maintenance,
use and installation of Liquid Controls Group products must comply with Liquid Controls Group instructions, applicable laws and safety
standards (such as NFPA Pamphlet 58 for LP-Gas and ANSI K61.1-1972 for Anhydrous Ammonia). (4) Transfer of toxic, dangerous,
flammable or explosive substances using Liquid Controls Group products is at user’s risk and equipment should be operated only by
qualified personnel according to applicable laws and safety standards.
ID108F

Table of Contents

Questions and Answers

  • M
    Michelle KramerAug 10, 2025
    Why is my Liquid Controls Water Pump so noisy?
    • E
      Elijah ConwayAug 10, 2025
      If your Liquid Controls Water Pump is noisy, it could be due to several reasons. One potential cause is cavitation due to poor suction conditions; you can address this by cleaning the inlet strainer or increasing the pipe size. Alternatively, the vanes might be sticking, requiring you to remove and clean them, checking the strainer for foreign material and replacing the vanes if they are swollen. Worn bearings could also be the culprit, necessitating replacement and monthly greasing. High differential pressure could be another cause, which can be resolved by checking for restrictions in the discharge line, ensuring the delivery hose isn't too small or long, and slowing down the pump. Lastly, PTO shaft vibration could be the issue, requiring inspection and repair of the driveline component.
  • W
    Whitney AnthonyAug 20, 2025
    What to do if my Liquid Controls Water Pump will not build pressure?
    • J
      Jason HoffmanAug 20, 2025
      If your Liquid Controls Water Pump will not build pressure, consider the following: Poor suction conditions may be the cause, so clean the inlet strainer and increase the pipe size. The internal bypass valve may be set too low or stuck open; check the valve or set it for higher pressure according to the instructions. Worn vanes and/or sideplates can also prevent pressure build-up; disassemble, inspect, and repair as necessary, and if the pump has been run dry, check for damage to the vanes and rotor-shaft assembly.
  • A
    Amy MayerAug 25, 2025
    Why does my Liquid Controls Water Pump run but have no flow?
    • J
      Jeffrey MurphyAug 26, 2025
      If your Liquid Controls Water Pump runs but there's no flow, several issues could be the cause. First, check the valves to ensure they are open, especially the tank valve, referring to the manufacturer’s instructions. A broken shaft could also be the problem, requiring you to disassemble and inspect the pump, repairing it if necessary. Lastly, a defective meter might be the cause, so service the meter.
  • J
    Jared VillaAug 29, 2025
    What to do if my Liquid Controls Water Pump will not turn or is locked up?
    • D
      Donald BrownAug 30, 2025
      If your Liquid Controls Water Pump is locked up and won't turn, it could be due to several reasons: Foreign matter might be inside the pump, so clean it out and check the strainer in the suction line. Broken vanes could also be the issue, requiring you to carefully clean out the pump and replace the vanes, also check for damage to the cam and rotor shaft assembly if the pump has been operated dry. A seized bearing could be the cause, so replace the pump bearings and grease them monthly using ball bearing grease manufactured for the intended service. Finally, moisture frozen in the pump can cause it to lock up, so let it thaw and break loose carefully.
  • T
    Tracy SimpsonSep 4, 2025
    Why is my Liquid Controls Water Pump leaking around the shaft?
    • C
      Christopher BoydSep 4, 2025
      If your Liquid Controls Water Pump is leaking around the shaft, it's likely due to a failed seal or O-rings. Inspect the seal assembly and replace it if necessary, ensuring the new seal is very clean during replacement. It's recommended to apply a light oil film on the O-rings. Also, if the pump has been run dry, check for damage to the vanes and rotor-shaft assembly.
  • D
    davidschmidtNov 13, 2025
    How to fix low capacity in my Liquid Controls Water Pump?
    • B
      Brent MartinezNov 13, 2025
      If your Liquid Controls Water Pump is experiencing low capacity, several factors could be responsible. The pump speed might be too slow, so check the engine speed and PTO ratio, consulting the pump performance curve and using a tachometer on the pump if the speed is questionable. Another possibility is a clogged strainer, which you should clean. The suction pipe might be too small or restricted, indicated by the pump inlet pressure dropping when the pump is started; remove any restrictions or modify the piping. Also, worn vanes can cause low capacity, so replace them if necessary. Check or replace sideplates if they are worn. Make sure angularity is within limits, yokes are parallel and slip-joint is greased. Check bearings. Lastly, vanes sticking can reduce capacity, so remove the vanes a...

Liquid Controls PT Series Specifications

General IconGeneral
TypePositive Displacement
Operating PressureUp to 150 PSI (10.3 bar)
Pressure Rating150 PSI (10.3 bar)
Materials of ConstructionAluminum, Stainless Steel
MaterialAluminum, Stainless Steel
Connection Typeflange