If you’ve ever stood on a job site, mid-pipe installation, when a supervisor stops you to ask, “Wait—what size check valve do we need for this line?” you know how critical that question is. As a supplier of other check valves—meaning the non-return valves that aren’t the swing, lift, or ball varieties you’ll find in every industrial catalog—I get that question at least a dozen times a week. Today, I’m pulling back the curtain on the size range our standard other check valves cover, because it’s not a one-size-fits-all number, and getting it wrong can lead to leaks, downtime, or even safety hazards on a job. Other Check Valve
First, let’s clarify what we mean by “other check valves” here. If you’re familiar with the common types: swing check valves (the flapper that swings open and closed), lift check valves (the disc that lifts off a seat with flow), and ball check valves (the metal or ceramic ball that seals when flow reverses), “other check valves” covers the specialized ones that fill gaps those three can’t. Think of silent check valves (also called inline check valves, designed to eliminate the clanging of swing valves in high-flow systems), dual plate check valves (thin, lightweight discs for tight piping spaces), wafer check valves (flat, slim bodies that fit between flanges), and nozzle check valves (shaped like a nozzle for high-pressure, high-velocity flow). These are the workhorses for everything from municipal water treatment and HVAC systems to oil and gas pipelines and food processing plants, and their size ranges are tailored exactly to the needs of those industries.
Let’s start with the most popular standard other check valve in our catalog right now: the wafer silent check valve. This is the one we sell most often, because it’s versatile enough for small residential plumbing projects and large municipal wastewater lines. Our standard wafer silent check valves range from ½-inch (DN15) all the way up to 48-inch (DN1200). Wait, I know what you’re thinking: ½-inch is tiny, perfect for a sink drain or a small HVAC line, and 48-inch is massive—you’d use that for a main water trunk line that serves an entire neighborhood. The sweet spot for most commercial and industrial jobs falls between 2-inch (DN50) and 12-inch (DN300), though we keep extra stock of the 6-inch (DN150) and 8-inch (DN200) because those are the go-to sizes for HVAC chilled water systems and process piping in food factories. What’s important here is that these sizes aren’t arbitrary: the ½-inch model is rated for low-flow domestic applications, while the 48-inch is engineered to handle 10,000 gallons per minute of flow at 150 PSI, so the size matches the pressure and flow rate it’s designed for.
Next up, dual plate check valves—another top-selling standard other check valve, loved for their slim profile that saves space in crowded piping skids. Unlike wafer valves, dual plate valves are designed with two hinged discs that close almost instantly when flow reverses, making them ideal for systems where water hammer is a concern. Our standard dual plate check valves have a slightly different size range than silent wafer valves: they start at 1-inch (DN25) to 36-inch (DN900). Why no ½-inch? For that tiny line, a swing check valve works just as well, and dual plate valves have a bit more internal mechanism that doesn’t make sense for such small diameters. The 1-inch (DN25) is used for small process lines in pharmaceutical manufacturing, while the 36-inch (DN900) model is built for power plant cooling systems, where every inch of space on the pipe rack is precious. We’ve found that most engineering teams prefer dual plate valves between 3-inch (DN80) and 16-inch (DN400) because that range balances their compact size with the high flow capacity industrial jobs need.
Now, if you work with high-pressure or high-velocity systems, you’re probably familiar with nozzle check valves, which fall squarely in the “other check valve” category. These aren’t for low-pressure plumbing—they’re built for oil and gas pipelines, refineries, and marine engine systems, where flow can hit 15,000 PSI or more. Our standard nozzle check valve size range is narrower than the other two I mentioned, starting at 2-inch (DN50) and going up to 20-inch (DN500). That’s because nozzle valves need to maintain a precise seal around their conical nozzle shape, and scaling them smaller than 2-inch creates too much pressure drop that would damage the valve or the piping. The 6-inch (DN150) nozzle check valve is a workhorse for offshore oil rig pipelines, where it needs to stop backflow of crude oil without failing under extreme pressure. We do make custom sizes beyond that range for specialized jobs, but our standard stock only covers that 2-inch to 20-inch range for nozzle valves.
Wait, I should also mention one more key other check valve: the inline silent check valve, which is often confused with the wafer silent valve but is designed to be installed in a straight pipe run, not between flanges. These are popular for municipal water treatment plants that need to replace old swing valves without reworking their entire piping system. Our standard inline silent check valves have the same size range as our wafer silent valves: ½-inch to 48-inch, but they’re built with a longer body to fit into straight pipe sections. I recently supplied a 30-inch (DN750) inline silent check valve to a water treatment plant in Ohio that was replacing 20-year-old swing valves in their main effluent line—this size was perfect for their flow rate of 8,000 gallons per minute, and it eliminated the constant clanging that was bothering nearby residents.
Now, let’s talk about what goes into defining these standard size ranges, because it’s not just pulling numbers out of a hat. All of our standard other check valves are manufactured to match industry standards set by groups like the American Water Works Association (AWWA), the American Society of Mechanical Engineers (ASME), and the International Organization for Standardization (ISO). AWWA C506, for example, sets the size and performance requirements for check valves used in water and wastewater applications, so our ½-inch to 48-inch wafer silent valves meet those exact specs, which is why water treatment plants trust them. ASME B16.10 covers the face-to-face dimensions of valves, so we make sure every size we offer fits the standard piping flanges on the market—no custom machining needed for installation. That’s a big deal for customers, because it means they can pull a valve off our shelf and install it that day, instead of waiting weeks for a custom part.
I also get asked all the time: what if I need a size outside those ranges? Maybe a 50-inch check valve for a new pipeline, or a ¼-inch for a tiny medical device line. For our standard line, we stick to the ranges I mentioned, but we do offer custom other check valves for those special cases. Just last month, we built a 42-inch custom dual plate check valve for a petrochemical plant in Texas that was expanding their pipeline, and a ⅜-inch nozzle check valve for a medical device manufacturer that needed to control flow in a dialysis machine. But the key here is that standard sizes are designed for the 90% of jobs that don’t need a custom part—they’re reliable, in stock, and priced lower than custom alternatives because we produce them in high volume.
Let me also share a real-life example that shows why getting the size range right matters. A couple of years ago, we got a call from a heating contractor in Chicago who had installed a 1-inch swing check valve in a ½-inch hot water line for a commercial building’s boiler system. Within a week, the valve was leaking—too much backflow was building up, and the 1-inch valve couldn’t seal properly. He’d grabbed the wrong valve because he thought check valves were all the same size range, not realizing that “other check valves” like silent or dual plate valves have different sizing, and swing valves have their own. We sent him a ½-inch wafer silent check valve the same day, and it fixed the problem immediately. That’s why I always tell customers to double-check the valve type and size range before ordering—saving that 10 minutes of research can save you hours of downtime and thousands of dollars in repairs.
Another point to note about our standard size ranges: they’re tailored to the most common pressure ratings. For example, our ½-inch to 12-inch wafer silent valves are rated for 150 PSI, which is perfect for HVAC and domestic plumbing, while our 14-inch to 48-inch models are rated for 125 PSI, ideal for low-pressure water mains. Our dual plate check valves come in three pressure ratings: 150, 300, and 600 PSI, with standard sizes from 1-inch to 36-inch. That means if you need a dual plate valve for a high-pressure process line (600 PSI), you can get that in standard sizes up to 36-inch, no custom order needed. The nozzle check valves, as I mentioned, are all built for high pressure, with our standard 2-inch to 20-inch models rated for 900 PSI, which is standard for oil and gas applications.
I know a lot of suppliers will try to sell you only a narrow range of sizes, like just 2-inch to 10-inch, because that’s what they sell most. But as a supplier who works with all kinds of industries, I know that a small bakery might need a ¾-inch check valve for their process line, while a power plant needs a 30-inch valve for their cooling system. That’s why we’ve expanded our standard other check valve size ranges to cover those needs, without making customers pay a premium for parts that are in stock.
If you’re planning a project and you’re not sure what size other check valve you need, don’t guess. Reach out to our team—we can help you match your flow rate, pressure, and piping specifications to the right standard size. We’ve worked on projects ranging from small residential additions to large industrial pipelines, and we know the ins and outs of check valve sizing. Whether you need a ½-inch silent valve for a sink drain or a 48-inch dual plate valve for a main water line, we have the standard size you need, ready to ship.
Stop wasting time and money on parts that don’t fit or don’t work. Let’s talk about your check valve needs today. Contact our team to get a quote, ask about sizing recommendations, or learn more about our standard other check valve lines.
Actuator Ball Valve References:
American Water Works Association. (2020). AWWA C506-20: Standard for Check Valves.
American Society of Mechanical Engineers. (2021). ASME B16.10-2021: Face-to-Face and End-to-End Dimensions of Valves.
International Organization for Standardization. (2019). ISO 10806:2019: Industrial Valves — Check Valves.
Wenzhou Zhenshun Valve Co., Ltd.
As one of the most professional other check valve manufacturers and suppliers in China, we’re featured by quality products and low price. Please rest assured to buy cheap other check valve made in China here from our factory. Also, quotation is available.
Address: Heyi Industrial Zone, Oubei Street, Yongjia County Wenzhou, Zhejiang China
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