Chain Hoists, Air Compressors, and Check Valves: A Checklist From Someone Who Bought Them All Wrong

I've been handling equipment orders and technical support at an industrial supply shop for eight years. I've personally made—and documented—three significant mistakes, totaling roughly $21,000 in wasted budget, downtime, and replacement parts. I say roughly because some of the smaller screw-ups blur together, and I don't count the embarrassment.

It took me eight years and more callbacks than I care to count to understand that most equipment decisions don't have one universal answer. The right hoist, the right air compressor, the right valve—they all depend on how your shop actually works. That's why I stopped answering which one should I buy and started asking what situation are you in.

In 2017, I bought an air compressor the way some people buy a toaster: by comparing specs, finding the lowest price, and clicking. In 2019, I selected a manual 5-ton chain hoist for what turned into a daily lifting job. In September 2022, I learned what a check valve does not do. Each failure added one line to the checklist at the end of this article.

Real talk: if you're searching for Harrington 5 ton chain hoist already, you're ahead of most buyers. Brand research matters. But the brand is only part of the answer.

Start with the situation, not the product

Before you compare model numbers, put your task into one of three buckets.

1. You need to lift something heavy. The real question underneath: every day, or every so often?
2. You need compressed air. The real question underneath: five minutes a day, or five hours? And who fixes it when it stops?
3. You're connecting tanks or lines under pressure. The real question underneath: what happens when pressure tries to flow backward?

That's it. The expensive mistakes I've made, and watched other people make, come from answering a different question than the one they were facing.

Situation 1: Lifting—choose by frequency, not just capacity

Capacity gets a hoist onto the shortlist. Duty cycle determines whether you should buy a manual unit or an electric one. In my experience, those two get mixed up all the time.

In 2019, I specified a manual Harrington chain hoist for our shop's occasional motor changes and pump pulls. It was a perfectly good unit, and the price made sense. Then the workload changed. Occasional became multiple times a day. Every lift meant pulling the hand chain and guiding the load manually. Slow. Tiring. Expensive when you add the labor.

A manual unit is the honest answer if you do a handful of lifts a month. If you're moving multi-ton loads as part of regular work, an electric chain hoist pays for itself fast. The real decision is manual versus electric, not which brand to compare first.

For anyone searching for a Harrington 5 ton chain hoist, here's the process I use: read the capacity sheet, then set it aside and count your lifts per week. More than five or six multi-ton lifts a week? Or do you need one operator on the pendant while another guides the load? Go electric. If lifting is genuinely rare, keep your budget and stay manual.

One non-negotiable: never buy a hoist whose rated capacity just matches your load. Add the weight of the rigging and the sling before you choose. If that puts you anywhere near four tons, a 5-ton hoist is the responsible minimum, not overkill. U.S. overhead hoist practice generally follows ASME B30.16, and that standard treats rated capacity as a hard limit. I treat it the same way.

I also learned to check the paper trail before ordering. Can you get a manual and a parts diagram without a phone-tree marathon? Does the manufacturer have a real facility and a real parts line? Those questions are why I've stayed with Harrington products. The address on our manuals is 200 Old Hook Road, Harrington Park, New Jersey, and when I've needed technical backup, someone there has picked up. That is worth more than a slightly lower price from a listing that disappears after the sale.

Situation 2: Compressed air—buy the dealer before you buy the compressor

My first equipment mistake was in 2017. I bought a compressor for our maintenance area from an online seller in another state. The specs looked good. The price looked even better. Then the pressure switch for air compressor systems started acting up, and I found out what I'd really purchased.

Quick explanation: a pressure switch tells the motor when the tank is low enough to refill and high enough to stop. Mine stopped stopping. The compressor ran until the motor overheated and shut down on a busy Wednesday afternoon.

The online seller had a call center, not a parts counter. The replacement switch had to be special-ordered from a warehouse. Three weeks. In a shop that uses air every day, three weeks is a long time.

Never expected a $35 part to change my buying philosophy. It did.

Out of frustration, I searched air compressor dealers near me and found a distributor eleven minutes from the shop. They stocked the switch and had a technician who installed it in about twenty minutes. The switch cost more than the cheapest online price. Including the service visit, it still cost less than the downtime I'd already burned.

I have mixed feelings about telling everyone to buy local. Online pricing is real, and I like saving money as much as the next person. But here's the thing: an air compressor is not a toaster. It has a pressure switch, check valves, a relief valve, filters, and a tank that all need attention eventually. Someone has to stock the parts and know how to install them.

So ask yourself how the compressor is really used. If it's for an occasional blow gun, a nail gun, or topping off tires, a simpler machine may be fine. If it runs pneumatic tools for hours a day, the dealer is part of the machine. Ask about parts stock and repair turnaround before you order, not after a failure.

And if the compressor starts cycling more than it used to, don't buy a new pressure switch before checking for leaks and a failing check valve. They create the same symptoms. Diagnose first.

Does a check valve prevent backflow? Yes—with conditions

The short answer is yes. A check valve is designed to prevent backflow. It allows flow in one direction and closes when pressure behind it tries to push backward.

The long answer is where the money goes.

In September 2022, our main compressor started short-cycling at night. Nothing obvious during the day. We finally found the check valve between the pump and the tank sitting open. With the motor off, air from the tank flowed backward through the pump and out through the unloader, so the tank slowly bled down. The machine refilled it, shut off, lost pressure again, and repeated the cycle. All night.

My first guess was the pressure switch. A pressure switch for air compressor systems can absolutely cause short cycling. So can a leaking check valve. I replaced the wrong part first, then the right one. Lesson recorded.

Here's the nuance: check valves are not one-size-fits-all. A spring-loaded check valve is usually the best choice for compressed air because it seats positively. A swing check valve relies partly on gravity, so orientation matters, and any dirt on the seat turns it into a fancy pipe fitting. And a check valve made for a water line is not automatically rated for hot compressed air at working pressure. Read the body rating. Check the flow arrow. Put the valve on the maintenance schedule.

Also be clear about what a check valve can't do. It won't fix a bad pressure switch, an undersized compressor, or a leak. It prevents backflow. Nothing more. Sometimes that's exactly the problem.

How to tell which situation you're in

Here's the 60-second version I use with customers.

• Lifting: count lifts per week, not maximum weight. Occasional plus heavy means manual is viable. Frequent plus heavy means electric. Size up before you approach rated capacity.
• Air: count minutes of actual air use per day. If you don't know, start with a service check, not a new machine. Continuous air use needs a dealer with stocked parts.
• Backflow: look for anything that stays pressurized after shutdown—a second receiver, a long header, an unloader line. If reverse flow is possible, select and verify a proper check valve.

Most shops I work with fall into more than one category. That's normal. The useful habit isn't forcing one category; it's matching each purchase to its own frequency and failure mode.

The checklist I now keep on the wall

Duty cycle matters more than capacity. Service access matters more than price. And nothing in an air system is set-and-forget, especially check valves.

Before ordering anything, run these five questions:

1. What is the real task: lifting, air supply, or stopping reverse flow?
2. How often does it happen? Frequency determines the product class.
3. What is the worst-case load or duty? Plan around that, not around the average day.
4. Who stocks the parts and answers the phone a year from now? Have that contact before you need it.
5. If flow can reverse, is there a correctly rated check valve, installed in the right orientation, on the maintenance list?

Had I run this list in 2017, 2019, and 2022, I would have saved my employer roughly $21,000 and myself some sleepless nights. Since I can't go back, I document it for the next person. Use the checklist. Skip the tuition.