SND Launches New DN25 External Thread Safety Valve with Lever, Optimizing Safety Protection for Small Pressure Vessels
Recently, SND Valve has rolled out its brand-new DN25 spring low-lift safety valve with lever and external thread design. Developed to fill the market gap of dedicated pressure relief valves for small-bore pressure-bearing equipment, this product has received bulk pre-inquiries from engineering procurement teams and machinery OEMs thanks to its compact build, easy installation and consistent pressure relief performance.
Developed to Resolve Real Pain Points in Industrial Sites
Through long-term communication with machinery manufacturers and pipeline installation contractors, our R&D team identified two common flaws of most small-size safety valves available on the market. Flanged valves are usually bulky and hard to fit inside compact air storage tanks and miniature heat-conducting oil units with limited mounting space. Meanwhile, fully enclosed safety valves lack manual test structures, making it impossible for maintenance crews to check valve responsiveness during routine inspections, which creates hidden safety hazards in continuous production lines.
This DN25 externally threaded safety valve is engineered to address both issues perfectly:
- External thread inlet connection: No extra flange gaskets or flanged fittings are required. The valve can be directly screwed onto threaded equipment ports, cutting down installation space occupation significantly. Clear cast markings of DN25 nominal diameter, PN16 pressure rating and medium flow arrow on the valve body help field technicians avoid reverse installation without repeatedly checking construction drawings.
- Integrated side test lever: Maintenance staff can manually lift the lever to test valve opening without disassembly during daily patrols. This simple design effectively prevents safety risks caused by stuck or failed valves that sit idle for months without regular function checks, especially ideal for non-stop production equipment with no downtime for full disassembly maintenance.
- One-piece cast WCB carbon steel body: Seamless casting eliminates leakage risks and delivers stable compatibility with compressed air, water, low-temperature heat transfer oil and other common industrial media. The blue coated top bonnet resists rust in humid workshops and outdoor exposed environments, extending the valve's overall service life.
- Low-lift pressure relief structure: The valve disc features a small opening stroke once set pressure is reached. It releases pressure gently instead of massive sudden medium ejection, stabilizing pipeline pressure while cutting unnecessary medium loss, perfectly matching medium and small pipeline systems that require mild pressure discharge.
Rigorous Factory Testing Compliant with Universal Industrial Standards
Before mass release, the product went through tens of thousands of open-close cycle durability tests in SND's in-house testing lab. Under PN16 rated working pressure, the deviation of popping pressure is controlled within ±5%, and zero leakage is guaranteed after the valve reseats itself. Alternating high and low temperature tests ranging from -20℃ to 180℃ prove the internal spring maintains stable elasticity, suitable for low-temperature northern workshops and high-temperature miniature boiler working conditions.
Every single valve is individually pressure-calibrated before delivery and comes with official inspection certification, fully meeting acceptance standards for machinery manufacturing, HVAC, food processing and air compressor supporting industries. Clients can mount 
the valve directly on equipment without secondary third-party inspection after procurement.
Wide Industry Compatibility & Ready Stock to Shorten Lead Time
According to SND's sales management team, this DN25 safety valve has entered full mass production, with all standard pressure specifications kept in ready stock. It is widely compatible with miniature air storage tanks, vertical small boilers, lab pressure reaction vessels, small hydraulic pressure pipelines, and supporting equipment for light industrial machinery.
Compared with conventional flanged safety valves of the same caliber, this threaded lever-type model cuts installation time by nearly half and lowers auxiliary fitting procurement costs for end clients. For bulk order buyers such as equipment manufacturers and engineering contractors, SND offers customized marking and fast batch delivery to match tight project schedules.
SND's new small-bore safety valve series further completes the brand's pressure protection valve product line. Moving forward, the company will keep upgrading valve products targeting segmented industrial scenarios, providing reliable, cost-effective fluid control solutions for global industrial clients.
