NLB water blasting units use positive displacement reciprocating pumps. This means that when they are on, they are constantly pumping water. Since shut-off-style lances and foot controls have no built-in means of dumping pressure, the safest way to use them is with an unloader valve. These are activated when an operator releases the trigger of the lance. This essentially shuts off the outlet for the water. When this happens, the unloader valve opens and dumps the water.
In automated applications, unloader valves can also be used to divert water back to the tank when the flow is shut off at the work site. NLB offers 25 gpm (UL-452) and 50 gpm (UL-904) models, both constructed of stainless steel for long life. Repair kits are available.
| Part Number | Max. Pressure | Max. Flow | Inlet Connection | Outlet Connection | |
|---|---|---|---|---|---|
| UL-452 | 10,000 psi max. (700 bar max.) | 25 gpm (95 lpm) | 1/2" NPT | 1/2" NPT | $1 Get a Quote |
| UL-904 | 10,000 psi max. (700 bar max.) | 50 gpm (190 lpm) | 1" NPT | 1" NPT | $1 Get a Quote |
Related Products
dry shut-off guns
Provides a means for completely stopping the flow of water the at the work site when an operator releases the trigger
dry shut-off foot controls
Stops the flow of water the at the work site when an operator steps off the foot pedal
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