CAT Pumps Unloader Brass, Model 7542, Min. Flow 1 GPM-Max. Flow 21 GPM, Min Pressure 800 PSI-Max. Pressure 4000 PSI


Model: 7542

This Pressure Sensitive Regulating Unloader is designed for single or multiple pump, weep or multi-nozzle systems. This unloader maintains set system pressure and goes into by-pass with the release of the trigger or an obstruction downstream. Pressure is held in the line during by-pass with full pressure when the gun is opened or the obstruction cleared and minimal pressure fluctuation with the alternating use of multiple guns. 5-10% by-pass is necessary for optimum performance (blue spring).


• Provides system pressure control and protection for single or multiple gun applications.
• Maintains full system pressure while running in bypass with minimal load on pump.
• Minimum pressure fluctuations with alternating use of multiple guns.
• Optional handles permits easy adjustment of pressure.
• Color coded spring aids in easy identification and can be quickly transferred from one model to another.
• Unloader comes standard with NBR O-rings. Alternative O-ring materials are available for higher temperatures or chemical compatibility.


Technical Specifications
Max Flow 21 gpm / 80 lpm
Min Flow 1 gpm / 3.8 lpm
Max Pressure 4000 psi
Inlet Port Size 1/2″ NPT(F)
Discharge Port Size 1/2″ NPT(F)
Accessory Type Unloaders
Material Brass
By-Pass Port 1/2″ NPT(F)


CAT Unloader Model 7542 Data Sheet


Cat Pumps Limited Warranty