Flow Safe F8000 Series

Questions and Answers

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Jamie LeonardAug 14, 2025
What to do if the Flow Safe F8000 main valve leaks through the outlet?
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  Micheal GrimesAug 14, 2025
  If the main valve on your Flow Safe Control Unit is leaking through the outlet, it could be due to: * Damage or contamination on the piston seat, main valve nozzle, piston seal/sealing surface, or lower liner seal/sealing surface. Disassemble the valve, remove the piston and liner, and examine the seat, seals, and sealing surfaces under magnification. Replace damaged parts or clean contaminated parts before reinstalling. * The dome is not loading properly through the pilot. See “The main valve does not close” for troubleshooting steps.
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Casey PruittAug 21, 2025
How to fix a Flow Safe F8000 Control Unit main valve that won't open?
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  Richard PonceAug 21, 2025
  If the main valve on your Flow Safe Control Unit isn't opening, consider the following: * The pilot valve inlet tubing might be plugged. Clean or unplug the line. * There may be contamination between the piston and liner. Disassemble the valve and examine the surfaces. Clean or replace parts as necessary, and determine the origin of the contamination within the system. Clean the system or provide filtration. * The inlet line could be blocked. Clear the blockage in a safe manner. * The outlet line might be blocked. Clear the blockage in a safe manner. * The pilot valve could be plugged. Disassemble and clean the pilot assembly. * The set pressure might be increased due to an auxiliary setter. Add the auxiliary setter differential to the set pressure.
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Elizabeth DavisAug 29, 2025
How to stop a Flow Safe Control Unit main valve from leaking around the cap?
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  Harold MooreAug 29, 2025
  If the main valve on your Flow Safe Control Unit is leaking around the cap, it could be due to: * Inadequate or uneven bolt torque. Retighten the cap bolts per Section 3.2. * A damaged sealing surface on the cap. Repair the defect or replace the cap. * A damaged, contaminated, or improperly seated upper liner seal. Replace damaged seals with new ones. If contaminated, clean and reinstall with light, even pressure in the groove.
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Harold TateNov 5, 2025
Why is my Flow Safe F8000 Control Unit main valve not closing?
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  Lindsay GutierrezNov 5, 2025
  The main valve on your Flow Safe Control Unit might not be closing due to several reasons: * There could be an obstruction in the pilot valve or tubing/filter from the main valve inlet. Try to clean or unplug it. * A field test connection or tube fitting could be leaking. Tighten the FTC jam nut and replace the seal, and tighten all fittings. * If you have an F200 pilot, the bushing might be too far into the body. Back it out and check for proper blowdown. * For an F300, the proportional band screw might be inserted too far, restricting dome pressurization. Back out the band screw until dome pressure is able to load through the pilot. * The pilot diaphragm could be leaking. Disassemble the pilot valve, remove and inspect the diaphragm, and replace it if needed. * The pickup tu...

Summary

Manual Overview and General Information

Valve Description, Operation, and Installation Guide

Description and Operation of the Relief Valve

Details the function, components, and operating principles of the pilot-operated relief valve.

Valve Service Envelope and Limitations

Specifies material compatibility, temperature, and pressure limits for valve operation.

Storage and Handling Procedures

Guidelines for proper storage and safe lifting procedures for the relief valve assembly.

Valve Installation Instructions

Instructions for correct valve installation, including orientation and piping considerations.

Remote Sense and Field Test Connection (FTC)

Explains the purpose and setup of remote sensing and field test connections.

Back Pressure Considerations for Set Pressure

Discusses the impact of back pressure on set pressure and valve operation.

Valve Startup Procedures

Procedures for safely starting up the relief valve after installation or maintenance.

Main Valve Maintenance Procedures

Main Valve Disassembly Guide

Step-by-step guide for safely taking apart the main valve assembly.

Main Valve Reassembly Guide

Detailed instructions for correctly reassembling the main valve after maintenance.

Pilot Valve Maintenance and Repair Procedures

F100 Pilot Valve Maintenance

Procedures for the disassembly and assembly of the F100 pilot valve.

F200 Pilot Valve Maintenance

Procedures for the disassembly and assembly of the F200 pilot valve.

F300 Diaphragm-Style Pilot Valve Maintenance

Disassembly and assembly steps for the F300 diaphragm-style pilot valve.

F300 Piston-Style Pilot Valve Maintenance

Disassembly and assembly steps for the F300 piston-style pilot valve.

F500 Pilot Valve Maintenance

Procedures for the disassembly and assembly of the F500 pilot valve.

Pilot Valve Set Pressure Adjustment and Testing

Definition of Set Pressure

Defines set pressure and industry standard tolerances for ASME and DOT applications.

Pressure Adjustment and Verification Methods

Methods for adjusting and verifying pilot valve set pressure using test equipment.

F100 Pilot Valve Set Pressure Adjustment

Specific steps for adjusting the set pressure of the F100 pilot valve.

F200 Pilot Valve Set Pressure Adjustment

Specific steps for adjusting set pressure and blowdown for the F200 pilot valve.

F300 Pilot Valve Set Pressure Adjustment

Steps for adjusting set pressure and modulation for the F300 pilot valve.

F500 Pilot Valve Set Pressure Adjustment

Procedure for adjusting set pressure for the F500 pilot valve.

Pilot Auxiliary Setter Adjustment

Instructions for adjusting set pressure using a pilot auxiliary setter.

Supplemental Testing and Accessories

Main Valve Subassembly Testing

Procedures for testing the main valve assembly for leakage and piston lift.

Final Assembly Testing

Final checks and testing of the complete pilot and main valve assembly.

F300 Pilot Valve Proportional Band Adjustment

Procedure to adjust the proportional band screw on the F300 pilot valve.

Inservice Testing with Field Test Connection (FTC)

How to perform in-service testing using the field test connection.

Harguard Clean Pilot Supply Tank Operation

Information on the Harguard clean pilot supply tank system and its operation.

Troubleshooting Guide for Valve Issues

Softgoods Kits and Part Identification

Main Valve Softgoods Kits

Lists part numbers and contents for main valve softgoods replacement kits.

Pilot Valve Softgoods Kits

Lists part numbers and contents for pilot valve softgoods replacement kits.