Servicing of Imperial Diaphragm Manifolds

To service an Imperial® Diaphragm Manifold you will need the following tools:

  • Imperial Overhaul Hit 600R
  • Adjustable Wrench
  • Clean Crease (Optional)
  • Torque Wrench
  • Long Nose Pliers
  • Clean Rags
  • Methylated Spirits or Rubbing Alcohol

Safety is important

  • Ensure work area is clean and well lit
  • Ensure there are no hazards or obstructions
  • Ensure you have safety glasses and put them on NOW
  • Check the manifold is not damaged
  • Check gauges are tight
  • Ensure the sightless (if fitted) has no damage.


Step 1 – Remove the handles

  • Using long-nose pliers gently prise off the knobs and place them in a safe convenient location
  • Check for any damage and replace if cracked


Step 2 – Remove Piston Assemblies

  • Remove all large brass nuts from the manifold
  • Gently pierce the large white diaphragm and remove it
  • Remove the spring and piston which is now removed

Step 3 – Remove All Components from Manifold

  • Your manifold should now be looking like this.
  • Check inside the cutout for the diaphragm seals, ensure there are not scratches or damage inside where the valve seats

Step 4 – Clean Valve Seat

  • Using a lint-free rag soaked in methylated spirits (or rubbing alcohol) clean the valve seat assembly
  • Leave to dry and ensure all alcohol has evaporated


Step 5 – Clean Brass Components

  • Next, disassemble the piston assembly and seal
  • Using a lint-free cloth soaked in a little alcohol clean all the brass components
  • Do this for all remaining piston assemblies
  • Using light crease lubricate the thread of the piston. Do this for all remaining pistons
  • You should end up with all pistons cleaned, brass nuts clean and all parts ready for assembly


Step 6 – Open the Repair Kit

  • Open the 600R kit and remove the components
  • Divide into 2, each kit does 2 valves
  • You should have
    – 2 Diaphragms (1 Thick 1 Thin)
    – A Brass Spacer
    – A Spring
    – A Small Nylon Spring Cap

Step 7 – Start Re-Assembly

  • Place the Spring (Large End Down) into the receptacle in the valve seat
  • Place spring cap on top

Step 8 – Valve Assembly

  • (Optional) Place a small amount of grease onto the edge of 1 face of the thick seal. Place Grease side down into the housing.

Step 9 – Valve Re-assembly

  • Place the thin seal into the receptacle
  • Place the spacer on top of this


  • Next, lightly grease screw thread of piston and insert into large brass nut

  • Ensure piston is fully restricted into the brass nut
  • Place assembly into valve seat and gently hand tighten the large nut


  • Tighten brass nut to 125 inch-pounds with a torque wrench
  • Repeat seal and piston installation and torque all remaining valve port assemblies
  • Check torque again after 24 hours


Last Step – Complete Re-Assembly

  • Finally, replace all knobs back onto piston shafts
  • Gently tighten fully and then loosen pistons
  • Perform cleanup of any excess grease

Related Posts

News & Updates

Donec rutrum congue leo eget malesuada. Nulla quis lorem ut libero malesuada feugiat. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur non nulla sit amet nisl tempus convallis quis ac lectus.  Vestibulum ante ipsum primis in faucibus