Changing the Ball Seat and Clapper Seal on an Oasis Valve

The process for replacing the ball seat and clapper seal on your Oasis Hydrant Assist Valve is easy!  

Tools Needed:  

  • 1/8” Allen Wrench 

  • 3/32” Allen Wrench 

  • 5/32” Allen Wrench 

  • Pointed seal pick 

  • 1.25” Combination Wrench or Crescent Wrench 

  • Light Grease 

Changing the Ball Seat: 

  1. Using your 1/8” allen wrench, back out the set screw that retains the outlet. his screw will have blue Loctite on it, so it may be difficult to turn at first. Put the set screw aside. 

  1. Once that outlet is free to swivel, unthread it all the way and set it aside. You can use a spanner wrench to remove this outlet if needed. 

  1. Using a seal pick, pry out the old seat and discard it. 

  1. Apply a light layer of grease where the seal will sit on valve body. 

  1. Install the new seat and make sure it is seated all the way around. The seat installs with the flat face toward the inside of the valve. 

  1. Apply a light layer of grease over the seat. 

  1. Rethread the outlet and thread in until it is tight. Then, back it off until the lockout screw faces near the top of the valve. 

  1. Turn appliance on its side and and line up the internal dimples with the threaded set screw hole. 

  1. Use a dab of blue Loctite on the set screw and thread in until flush. Do not tighten it against the outlet.  

  1. Operate the ball once or twice to make sure the operation is smooth.  


Changing the Clapper Seal: 

Please note, you will keep all parts during this procedure except the rubber seals. 

  1. Remove the To Fire outlet labelled on the front of your valve by removing the set screw using a 1/8” allen wrench. Put the set screw to the side. 

  1. Unthread the outlet and set it aside. This outlet is sealed by an O-Ring. Sometimes the O-Ring will come away with the outlet and other times it will stay inside the valve. 

  1. Remove the clapper indicator by backing out the set screw using a 3/32” allen wrench.  

  1. Use a 1.25” wrench to crack the nut out on the top. This nut does use Blue Loctite and may require some force. It is also sealed with an O-ring so there may be some tension against it.  

  1. From the To Fire side of the valve, hold onto the clapper and remove the pin. 

  1. Remove the clapper by fitting it through the two machined notches inside the valve. 

  1. Set the valve aside.  

  1. Using 5/32” Allen wrench, remove the four button head screws from the clapper. These screws use Red Loctite and will be somewhat difficult.  

  1. Remove the two long screws from the oval seal side. This will allow the circle seal to come loose from the clapper.  

  1. Place the clapper on a surface in front of you with the shaft receptacle to your left side and the notch facing away from you. The oval seal goes against the side now facing up with its raised face toward you. The stainless-steel disc goes on top. 

  1. Take the round seal plate and place it on the metal backer plate. Place the stainless-steel disc on top of the seal plate. 

  1. Using the short screws, apply red Loctite liberally and install the stainless plate to the rubber seal and into the backer plate. Tighten both screws. 

  1. Using the long bolts, install them into the oval side and push all the way through. Once through, liberally apply red Loctite to the threads and align these with the two open holes on the circular backer plate. Tighten. 

  1. Replace the clapper inside your valve. The clapper can only go in one way and operate properly. The notch end must be facing up. Line the clapper up with the two cutouts in the opening and push in. 

  1. Reinstall shaft with the egg-shaped end first. Apply a small amount of grease to the bottom prior to installation. The tThe top of the shaft has a roll pin that will fit into the groove on the clapper. 

  1. Two O-rings on the retaining nut go over the shaft, one outer and one inner. Apply a light coat of grease but keep the threads as clean as you can.  

  1. Once greased, put a bit of blue Loctite on the threads, hold the clapper up, and press over the shaft and thread that on. 

  1. Use your wrench to tighten until tight.  

  1. Press the clapper against the From Relay Pump side and reinstall your indicator with a small amount of blue Loctite on the set screw that retains it. Thread in until the indicator no longer wobbles. 

  1. Grab your outlet and make sure there is a light coat of grease on the O-ring that is either on the outlet or back in the casting.  

  1. Re-install the outlet paying attention to the drilled holes and dimples to align with the set screw. 

  1. Apply blue Loctite on the set screw, align the dimple with the set screw hole and thread set screw in until just flush. 


Do you still have questions or need help? Contact our support team today