4000 PSI Brass Unloader with Injector

The CAT Pumps 7860 pressure unloader is constructed from brass and has a 1/2" NPT inlet and a 3/8" NPT discharge port. Use this regulating device to maintain a consistent pressure to keep pumps and spray guns running properly without damage.

Specifications:

• Pressure Range: 700-4000 PSI
• Flow Range: 3-5 GPM
• Inlet Port: 1/2" NPTF
• Discharge Port: 3/8" NPTM
• Built-in channel bypass port

Features:

• Frequently used with 66DX30G1I, 66DX35G1I, and 66DX40G1I pumps.
• Provides system pressure setting and protection for single pump and non-weep gun installation.
  
• Built-in by-pass channel for safe low pressure by-pass when gun is shut off.
  
• Convenient flo-thru screws for easy direct mounting.
  
• Pressure sensitive feature permits immediate pressure when gun open.
  
• Handle permits easy adjustments of pressure.

Operation:

• Purge pump of air before commencing operation by allowing liquid to flow through the pump without discharge restriction. Removing trapped air will assure full system pressure can be obtained. Install a pressure gauge close to the manifold head of the pump to assist in setting system pressure and to periodically monitor system pressure. Setting and adjusting the unloader pressure must be done with the system turned on. Start the system with the unloader backed off to the lowest pressure setting (counterclockwise direction). Squeeze the trigger and read the pressure on the gauge at the pump. Do not read pressure at the gun or nozzle. If more pressure is desired, release the trigger, turn adjusting cap one quarter turn in a clockwise direction.  Squeeze the trigger and read the pressure. Repeat this process until the desired system pressure is reached. Thread locking nut up to adjusting cap and tighten set screw. All high pressure systems should have a secondary relief valve.  Set secondary relief valve 200-300 psi above the unloader setting.