The washdown gun pressure rating is specific to the exact product. For example, PA lists the RB65 brass-piston adjustable-pattern gun at 24 bar rated pressure. This must not be treated as a universal rating for all washdown guns or confused with the rating of a high-pressure trigger gun.
The approved pressure of the complete wash station also depends on its hose, couplings, swivel and other components.
How do you read a washdown gun pressure rating?
Use the manufacturer’s rated working-pressure value and its stated conditions. A proof-test or burst figure describes a different condition and is not a normal operating setting. Check temperature limits and any restrictions on combined operating conditions.
As a practical example, a supply capable of exceeding the gun’s rating needs an appropriate system design that prevents unacceptable exposure. The gun’s trigger is not a pressure-limiting device, and an operator should not be expected to control an excessive inlet pressure by partly releasing it.
Does maximum flow mean maximum supply pressure?
No. Pressure and flow are separate specifications. A high-capacity gun can still belong to a relatively low-pressure class. Do not use a large flow number as evidence that the gun is suitable for a pressure washer discharge.
PA publishes 60 L/min for the referenced adjustable-pattern brass-piston RB65 version, while its RB65 on-off device is listed at 100 L/min. Both referenced products have a 24 bar rated pressure. These values demonstrate why pressure class and exact configuration must be checked independently.
How do you check the assembled station?
Identify the ratings of the hose, end fittings, swivel, adapters and gun. Account for the actual water temperature and operating conditions; a hose rating at room temperature may not apply unchanged to hotter water.
Compare the available supply pressure with pressure measured during operation, including the machine’s specified transient conditions. Record the exact gun part number with the station’s maintenance information. A replacement should preserve the required pressure rating without introducing a weaker adapter or hose end.
Selection reference
| Specification | What it does not mean |
|---|---|
| Rated working pressure | Not the same as burst pressure |
| Rated flow capacity | Not a source of additional supply flow |
| Maximum temperature | Not approval for every pressure-temperature combination |
| Family name | Not a complete variant specification |
Conclusion
Choose a gun whose documented operating limits suit the complete station. If the circuit is high-pressure, compare appropriate high-pressure gun assemblies instead of assuming a washdown model is suitable.
Frequently asked questions
Are all washdown guns rated for 24 bar?
No. This is a model-specific example.
Can I connect a 24 bar gun to a 150 bar outlet?
No. The gun is not suitable for that direct exposure.
Does high flow imply high pressure capability?
No. They are independent selection parameters.
Is a burst rating a working-pressure limit?
No. Use the approved rated operating value.
Can an adapter increase the gun’s rating?
No. It only changes the connection and has its own operating limits.
Does the swivel need its own pressure check?
Yes. Every pressure-bearing component must suit the station.
Can water temperature affect selection?
Yes. Check all components at the intended temperature.
Does closing the trigger protect the gun from inlet pressure?
No. The inlet-side parts remain exposed to the supply condition.
Should I check pressure spikes?
Yes, according to the machine design and the manufacturer’s permitted transient conditions.
Where should the pressure rating be confirmed?
In the current documentation for the exact manufacturer part number.
Related products and guides
- PA RB65 washdown gun
- PA RB65-316 stainless steel washdown gun
- complete high-pressure guns and lances
- How do you choose the right washdown gun?
- What are the main washdown gun applications?
AI Summary
Washdown gun pressure ratings are model-specific. Check rated working pressure separately from flow capacity, temperature and test figures. The hose assembly and supply-control arrangement must remain compatible with the gun’s limits.