Car Wash

Car Wash Air Filters, Regulators, Lubricators and Diaphragm Pumps

A car wash runs on compressed air as much as on water. Air drives the spray nozzles, dryers, robotic arms, pumps and automated controls, and all of it works in a bay full of water, road grime and wash chemicals. The ARO equipment on this page keeps that air supply clean, dry and at the right pressure: ARO-Flo filters, regulators, lubricators, piggyback filter-regulators and FRL combination units from 1/4" to 1", Compact Series 1/2" diaphragm pumps for moving wash chemicals, and in-line valves for setting airflow and cylinder speed.

Why Compressed Air Preparation Matters in a Car Wash

Untreated compressed air carries condensed water, compressor oil and debris from the piping. In a car wash, where moisture, dirt and chemicals are everywhere, that contamination wears seals, sticks valves and shortens the life of every pneumatic component downstream. Pressure that drifts causes its own problems: too low and the dryers lose power, too high and equipment that touches the vehicle can do damage. Air preparation at each point of use deals with both.

• Filters take water, dirt and oil out of the air before they reach valves, cylinders and air motors
• Regulators hold each line at a steady pressure, so dryers keep their drying power and spray equipment performs the same on every vehicle
• Lubricators meter a fine oil mist into equipment that needs it, cutting friction and wear
• Metal filter bowls with automatic drains empty collected water without anyone opening a valve
• Clean, regulated air lowers the risk of burst hoses and damaged components, which keeps the wash safer for staff

Choosing the Right Air Preparation Component

Each component does one job. Most wash systems need a filter and a regulator at every point of use, a lubricator only where the equipment calls for oil, and a coalescing stage where oil aerosols would cause trouble.

Size by Flow, Not by Pipe Size

An undersized unit starves the equipment behind it, however well it filters. Work from the air flow your equipment draws in SCFM, then pick the series that covers it with room to spare. The four ARO-Flo series on this page cover point-of-use stations through to main air headers:

Diaphragm Pumps for Car Wash Chemicals

ARO Compact Series 1/2" air-operated double diaphragm (AODD) pumps run on the same compressed air as the rest of the wash. They are self-priming, have no mechanical seals to leak, and pass solids up to 3/32", which suits drawing presoaks, detergents, waxes and drying agents from drums and totes. They handle the chemical side of the wash, so they work alongside a high pressure water pump for car wash rinse and spray stages rather than replacing it. Every model below has a polypropylene body, 1/2" NPTF fluid ports and a 100 psi maximum discharge pressure. What changes is the diaphragm and check ball material, and that is what has to match your chemical. Models starting 666053 use a 3-piece manifold, models starting 66605J a 1-piece manifold.

Flow Control, Needle and Check Valves

ARO In-Line Composite valves fit straight into the air line to fine-tune what happens after the FRL.

• Flow control valves Adjust airflow to set the speed of cylinders and actuators on wash equipment. Five sizes from 1/8" to 3/4", part numbers 104104-F01 to F06.
• Needle valves Meter air precisely where a small, steady flow is needed. Uni-directional, from 28 SCFM at 1/4" to 100 SCFM at 3/4", plus a 1/4" version with a stainless steel needle and inserts (104104-NS2).
• Check valves Let air flow one way and block it from flowing back. Four sizes from 1/8" to 1/2", with the 3/8" 104104-C03 rated at 58 SCFM.
• Shared ratings All in-line valves on this page have composite bodies, NPT ports and a 200 psi maximum inlet pressure.

Winterizing the Car Wash Air System

Cold weather is hardest on the air system. Water that collects in air lines, filter bowls and valves can freeze, block flow and crack components, often overnight. The fix is to get the water out before it settles: particulate filtration at each point of use, working automatic drains, and regular checks of filter elements and bowls through the season.

Frequently Asked Questions

Clean, Dry Air for Every Wash Bay

Car wash equipment is built to handle water and chemicals on the outside. The air feeding it needs the opposite: clean, dry and held at the right pressure, shift after shift and through the winter. Matching filters, regulators, lubricators and pumps to each point of use is what keeps nozzles, dryers and controls working the way they were designed to.

Order the car wash range above, or browse the complete ARO lines of filters, regulators, lubricators, piggybacks, combination units, diaphragm pumps, flow control and needle valves and parts and kits. For more background, see ARO's guide to FRLs in car wash systems.