The Most Versatile & Cost-Effective Way to Test Straight Bodied Valves!

The CALDER HYDROPRO™ Universal Straight Valve (USV)  Tester is the most versatile and user-friendly tester in the industry, designed to clamp a wide variety of straight bodied valves. When paired with the HYDROPROConsole, the HYDROPROUSV is ideal for hydrostatic tests up to 9700 psi and low-pressure air tests up to 125 psi.


Rapid advance and retract for quickly widening or narrowing the gap between the patented Easy-Out Seal Plates to rapidly transition from smaller valves to larger valves. This greatly reduces overall test times, while most competitive systems use a hand wheel and acme screw which is significantly slower.

Unique valve tilting option makes it easy to find the best orientation for loading the valve and hydraulically tilts the clamp fixture 90 degrees from horizontal to vertical, ensuring removal of all air prior to pressurizing the system. This enables higher test accuracy and improved safety. Without tilting the valve, it is not possible to guarantee that all the air is removed. Most competitive systems use a vacuum for this process, which is not nearly as effective and reliable as our tilting approach.

Patented Easy-Out Seal Plates™ in the USV clamping fixture allows seal plates to be changed quickly and easily without the need to mess with special tools, bolts, etc. Nobody else offers this!

Quick-fill water circuit supports quick-fill water capability included with the HYDROPRO™ Console, allowing operators to fill valves up fast and reduce overall test time.

Field upgradable/expandable to evolve with your business and maximize your ROI. Our modular, common-platform design ensures that all equipment and accessories are plug-and-play compatible, so we can seamlessly upgrade or expand your system in the field at any time in the future to meet your changing business needs. This is by far the most flexible and cost-effective way to manage your valve testing program and maximize your return on investment over the life of the system.

Ability to test multiple valves concurrently when paired with the CALDER HYDROPRO™ Console. Use a USV clamping fixture to test on one port of the console while setting up the next test piece on the other port (using another USV clamping fixture, any other type of clamping fixture, or blind flanging). This minimizes downtime and maximizes your productivity. No other comparable tester can do this!

Quick-connect gauges can be easily removed for calibration or maintenance, to maximize the up-time of your tester.

Intuitive control panel layout makes performing a test procedure efficient and easy on the operator while reducing the chance of user errors.

Unique clamp box cut-outs are designed to accommodate valves with actuators. The newly enhanced and rigid design gives operators the ability to clamp and test more valves than any other system on the market.

Integrated carriage system so that the clamping system always glides straight and smooth while extending or retracting.

Single cylinder hydraulic clamping securely clamps both sides of the valve in one motion.

Combine the USV with the HYDROPRO™ Console and the SMARTEST™ intelligent data acquisition and analysis system (DAAS), or our SMARTEST PLUS™ data acquisition and control system (DACS) for programmable, automated control of your testing procedure. These systems help to boost productivity, reduce the learning curve and eliminate user errors. Built-in WiFi capability makes it easy to share data securely and keep records. The rugged industrial electronics and splash-proof (IP67) enclosure make the system ideal for use in industrial valve testing environments.

Extensive operating manual contains easy to follow tips and includes step-by-step setup instructions for various valve testing operations.

Only shop air and water needed for functionality.


The USV clamping fixture is physically separated from the test pressure controls so it can be placed in a separate room/enclosure or behind CALDER Test Barriers during testing, keeping the operator away from pressurized components.

Patent Pending Safety Interlock system is the best in the industry, with interlocking knobs and valve handles that will not release the clamp pressure until the test pressure valve is opened and internal test pressure is released.

Every component in the USV pressure circuit is certified by the component’s OEM to the maximum specified test pressure (allowable working pressure) of the system for increased safety, quality and durability. Most other OEMs skimp on quality by using components rated at only a fraction of the full test pressure. Check this carefully when investing in a valve testing system. Nothing but the best for our customers!

Heavy-duty console walls are built with 12-gage powder-coated steel to protect internal components from damage, making this tester rugged and durable for long life and reliable operation in industrial environments.

The USV clamping fixture’s body, clamping arms and mechanical system are designed to be far stronger than other comparable systems. We use sophisticated design techniques, including extensive finite element analysis, as well as comprehensive testing, the highest-quality components and materials, and state-of-the-art manufacturing to ensure our systems are rugged, strong and durable. We admit it: they’re over-engineered – in the best sense of the term! And our customers get the benefits: a stronger, safer and more capable system that will last a long time even in the harshest industrial environments. Whereas other OEM’s clamping arms and fixture bodies/components bend and distort to a significant (sometimes alarming!) degree during high-pressure testing, sometimes even to the point of failure, the CALDER USV fixture stays strong, stable and robust even at the maximum rated test pressure of the system.

ISO 9001 certified manufacturing ensures all CALDER products are built to the highest quality standards. Always ask for a copy of the manufacturer’s official ISO certificate when investing in a valve testing system. And ask whether your whole system – from the ground up – will be built in their ISO-certified factory, or if parts of the system are built outside by third parties (and are these third parties ISO certified too?).

CE certified and available world-wide! All CALDER products are available for sale world-wide, including in the European Union and other locations where CE certification is required. With regional offices and service centers in the USA, Germany, the United Kingdom, Dubai and Singapore, and sales people and authorized representatives covering the globe – France, Poland, Russia, Mexico and Japan to name but a few – we are ready to serve you wherever you are!

Standard 2-year warranty is the longest in the industry! Unlike many of our competitors, we don’t skimp on quality, so we can put our money where our mouth is. And – ask us how to extend your warranty out to 5 years . . .

All products are manufactured in the USA. Unlike most other providers, we don’t use cheaply-made components and materials from substandard suppliers and we don’t manufacture in so-called “low labor cost” places. Our ISO certified factory in Oregon has more than 50 years of manufacturing experience and a legendary reputation for quality!

CALDER test systems are more accurate than other comparable testers. Ask us to show you how we achieve this superior performance by design.

CALDER CARE™ Total Preventative Maintenance Programs give you hassle-free, worry-free system ownership and warranty coverage up to 5 years! Let our experts take care of you and your system.

World-wide reach and local service backed by the vast CLIMAX global support network, so you can always get expert support and field service for your CALDER test system. We are everywhere you are, with exactly what you need!

Custom system design services from the most experienced team of experts in the business. When you have unique or complex requirements for valve repair or testing, give us a call – there’s no job we can’t do!

THE CALDER VALVE INSTITUTE™ is standing by to train your people at one of our global training centers or at your own site, world-wide! CALDER offers consulting, applications engineering, training, installation and start-up support, and after-sale technical support.

Outrageously good customer service – we’re available 24/7!



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With vastly superior quality, safety, durability, flexibility, performance and support owning a CALDER Advanced Valve Testing System is by far the most flexible and cost-effective way to manage your valve testing program, reduce your total cost of ownership and maximize your return on investment over the life of the test system. End-to-end solutions – from products, consulting, custom design, training, start-up, after-sale service, spare parts, repair, and rentals – allow CALDER to deliver unmatched value in our industry, world-wide. No other major OEM can offer you all this. If they say they can, check the facts carefully, and then call us for the perfect solution.