As a trunnion ball valve supplier who has spent the last decade working closely with industrial manufacturers across high-stakes sectors, I get asked this question at least once a month: Can a trunnion ball valve be used in aerospace industries? At first glance, it might seem like a mismatch. Aerospace engineering relies on precision, light weight, and resistance to extreme conditions—all factors people often assume push traditional trunnion ball valves out of the running. But after working on projects for satellite propulsion systems, commercial jet fuel lines, and even lunar lander test rigs, I can tell you the answer is a resounding yes—if you tailor the valve design to meet the unique demands of aerospace applications. Trunnion Ball Valve
Let’s start with what makes a trunnion ball valve different from other ball valve types. Unlike a floating ball valve, where the sphere is held in place by the upstream and downstream pressure, a trunnion design has a trunnion pin that supports both ends of the ball. That means the load from process pressure is distributed across the trunnions, not just the seats. This gives trunnion valves two key advantages: they handle extremely high pressure and differential pressure reliably, and they seal better even in harsh, fluctuating operating conditions. Those aren’t just generic benefits—they’re exactly the features aerospace engineers need, but only if we solve the aerospace-specific pain points that have held trunnion valves back in the past.
First, let’s talk about pressure and fuel systems, one of the most common aerospace uses for valves. Commercial aircraft jet fuel systems operate at pressures ranging from 150 PSI on takeoff to just 20 PSI at cruising altitude, and they’re exposed to thousands of thermal cycles a year—temperatures swinging from -65°F at 35,000 feet to 180°F on the tarmac. A trunnion ball valve, when made with the right materials, can handle that. Last year, we supplied trunnion ball valves to a major jet engine manufacturer for their fuel bypass lines; during testing, the valves withstood 1,200 PSI of test pressure, zero leakage across 10,000 thermal cycles, and remained fully functional after being submerged in jet fuel for 1,000 hours. That’s not a fluke—it’s the trunnion design’s ability to maintain seat loading even when system pressure drops. Floating ball valves, by contrast, tend to lose seat seal at low pressures because the ball isn’t held rigidly, leading to leaks. For aerospace, where even a tiny fuel leak is a safety hazard, that’s a non-negotiable.
Then there’s satellite and spacecraft applications, which are where trunnion valves really shine. Satellite propulsion systems use hypergolic fuels—highly reactive, toxic chemicals like hydrazine and nitrogen tetroxide—that require hermetic sealing to prevent any leakage, even in the vacuum of space. I’ve worked on a program for a small lunar communication satellite that needed a valve for its attitude control thruster system. The team initially tested a floating ball valve, but it leaked when exposed to vacuum because the seats expanded at different rates than the ball. We redesigned a trunnion ball valve with a titanium alloy ball and Inconel trunnion pins, which have almost matched thermal expansion rates, and PTFE-based seats modified with carbon fiber to resist outgassing in vacuum. The valve passed NASA’s strict outgassing test (ASTM E595) with total mass loss under 0.1%—well below the 1% limit—and zero leakage under 1,000 PSI differential pressure. That’s the kind of performance only a trunnion design can deliver for space applications.
But here’s the catch: traditional trunnion ball valves are heavy, and aerospace is obsessed with weight reduction. Every pound of extra hardware adds to launch costs—literally, each pound costs thousands of dollars to put into orbit—so we can’t use standard carbon steel trunnion valves for aerospace. That’s where our engineering team has focused most of our innovation over the last five years. Instead of bulky carbon steel bodies, we use high-strength, lightweight alloys like 17-4 PH stainless steel or titanium, which are half the weight of standard valve bodies but maintain 90% of the tensile strength. We machine the trunnion pins from solid Inconel 718, a superalloy that resists corrosion and extreme temperatures, and optimize the valve’s stem design to eliminate excess material. Last year, we delivered a 2-inch trunnion ball valve for a satellite fuel system that weighed just 2.1 pounds—compared to a standard 2-inch trunnion valve, which would weigh 7 pounds. That weight savings isn’t just a number; it meant the satellite team could either add more fuel to extend its mission life or reduce launch costs by $15,000 per valve. It’s those small, targeted design changes that make trunnion valves viable for aerospace, not just industrial applications.
Another big consideration for aerospace is reliability under extreme operating conditions. Commercial jets and spacecraft don’t have the luxury of shutting down to perform maintenance, so valves need a 30+ year service life with zero downtime. Trunnion ball valves are inherently more reliable than other valve types for long-term use because their load distribution reduces wear on the seats and trunnion pins. We did a test last year where we cycled a trunnion ball valve 100,000 times—equivalent to 30 years of jet fuel system operation—with no change in seal performance. A gate valve, which is another common option for fuel systems, would typically start leaking after 10,000 cycles because of seat galling. Even needle valves, which are often used in small aerospace systems, can suffer from stem wear at high cycle counts. For mission-critical aerospace applications, that kind of durability is irreplaceable.
Of course, there are challenges we still have to address to make trunnion ball valves a more widespread choice in aerospace. The first is certification. Aerospace components have to meet strict standards from agencies like NASA, the FAA, and EASA, and many of those standards were written decades ago when trunnion valves were not commonly used in aerospace. That means we have to work closely with clients to test and certify every valve for their specific application, which takes time and investment. But over the last three years, we’ve successfully certified our trunnion ball valves for multiple NASA satellite programs and two commercial jet engine programs, and we’re working to update our certification processes to make them faster for future projects.
The second challenge is precision manufacturing. Aerospace valves need tolerances measured in thousandths of an inch—tighter than most industrial valves. The ball, trunnion pins, and seats have to be machined to exact specifications to ensure consistent seal performance. That’s why we invested $2 million in a new CNC machining facility two years ago, specifically for aerospace-grade trunnion valves, with precision inspection equipment that checks every part against aerospace standards. A floating ball valve can have slightly looser tolerances because the pressure helps push the ball against the seats, but trunnion valves rely on the trunnion and ball alignment to seal, so precision is non-negotiable. We’ve cut our error rate to less than 0.5% over the last two years, which is on par with the best aerospace valve manufacturers in the industry.
I’ve seen first-hand how trunnion ball valves have evolved from being a industrial workhorse to a viable, high-performance option for aerospace. But I also know that many aerospace engineers still default to gate or needle valves because they’re more familiar with them, or they assume trunnion valves are too heavy or too expensive. Let’s be clear: they are more expensive than standard industrial valves, but when you factor in the weight savings, longer service life, and lower failure risk, the total cost of ownership is lower than many alternative valve types for aerospace applications. For satellite programs, where a single launch can cost $100 million, spending an extra $5,000 on a valve that eliminates the risk of a fuel leak in space is a no-brainer. For commercial jets, where downtime can cost an airline $100,000 an hour, a trunnion valve that lasts for the life of the aircraft reduces maintenance costs dramatically.
Last year, we had a client come to us for a satellite propulsion system valve. They’d tested three different valve types—needle, gate, and a competing floating ball valve—and all failed either the vacuum leak test, the thermal cycle test, or the weight requirement. Our trunnion ball valve passed every test, and they ended up using 12 of them across their constellation of 20 satellites. That’s the kind of win that makes all the late nights in the machining facility worth it.
So, to circle back to the original question: Can a trunnion ball valve be used in aerospace industries? The answer is a qualified yes—when designed, manufactured, and certified specifically for aerospace applications. It’s not a one-size-fits-all solution, and it can’t be a standard off-the-shelf valve. But when you work with a supplier who understands both the trunnion valve design and the unique demands of aerospace, it’s a reliable, cost-effective option that solves many of the sealing, pressure, and durability problems that other valve types struggle with.
If you’re an aerospace engineer, program manager, or procurement lead who’s been evaluating valves for a fuel system, propulsion system, or any other mission-critical application, and you’ve been curious about trunnion ball valves but worried about their fit for aerospace, I’d encourage you to reach out. We work directly with clients to customize trunnion valve designs for their specific requirements, from material selection to weight optimization to certification support. We’ve spent the last decade adapting our trunnion valve technology for high-stakes, high-precision applications, and we’re ready to bring that expertise to your next aerospace project. Whether you’re working on a commercial jet, a satellite, a lunar lander, or any other aerospace system, let’s talk about how a trunnion ball valve can meet your needs.
Butterfly Valve References
ASTM E595, Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in Space Environment, American Society for Testing and Materials
SAE AS8800, Aerospace Specification for Valves, Society of Automotive Engineers
NASA Goddard Space Flight Center, Propulsion System Valve Design and Qualification Guidelines, 2021
FAA AC 25.1430-1, Fuel System Components Certification, Federal Aviation Administration, 2019
Zhejiang Sunawei Valve Co., Ltd.
As one of the most professional trunnion ball valve manufacturers and suppliers in China, we offer a wide range of valves with superior quality. Please feel free to wholesale high quality trunnion ball valve at competitive price from our factory. We also accept customized orders.
Address: Anfeng Industrial, Oubei Town, Wenzhou City, Zhejiang, China
E-mail: snv@sunawevalve.com
WebSite: https://www.sunay-valves.com/
