Danfoss has rolled out its brand-new OFB tight oil-free shut-off ball valve range, a landmark ball valve innovation that extends the brand’s EXO (Extended Oil-Free) product line, specifically engineered for oil-free chillers and heat pumps fitted with Turbocor® compressors. This multi-functional ball valve addresses long-standing suction-side pain points for oil-free cooling systems, delivering upgraded safety and stability for mission-critical HVAC and refrigeration applications such as data centers and premium high-performance HVAC installations.
As a dual-purpose ball valve installed on unit suction lines, the OFB ball valve acts as both a standard service isolation valve and an active anti-refrigerant liquid migration valve when paired with electric actuators. Conventional ball valves often fail to balance low pressure drop and reliable shut-off for oil-free centrifugal compressor systems, risking liquid refrigerant backflow during shutdown or startup that damages high-value Turbocor® compressors. Danfoss resolves this industry-wide flaw with its proprietary three-in-one integrated ball valve architecture, merging three core functions into a single valve body: streamlined suction-cone fluid transition, zero-leak tight shut-off ball valve core, and full motorization compatibility.
The optimized suction cone inside the ball valve maintains superior inlet flow efficiency with near-negligible pressure loss to preserve system energy performance, while the precision ball valve seal completely blocks refrigerant migration across all operating states. This all-in-one ball valve design eliminates the need for multiple separate piping components, simplifying system layout, cutting assembly costs and lowering potential leakage points for OEM manufacturers.
Built on a fully modular platform, the OFB ball valve boasts universal compatibility with all Danfoss Turbocor® TGx and TTx compressors. Engineers can select from 12 inlet flange configurations covering 3-inch, 4-inch and 5-inch sizes, with compliance to global mainstream piping standards including ANSI, ASTM, DIN and EN. The heavy-duty ball valve body delivers consistent performance across an extreme operating temperature window of -40 °C to +100 °C, enabling reliable deployment in all climate zones for both new-build chiller projects and existing equipment retrofits.
For automated control, the OFB ball valve supports four compact MQT electrical actuators equipped with brushless motor technology, delivering a rapid 10-second full-stroke actuation response. The ball valve incorporates an enhanced reinforced stem sealing assembly, paired with heavy-duty guide bearings and top-mounted structural supports to prevent shaft misalignment and minimize internal wear under continuous high-load operation. A standout technical advantage of this ball valve is its ultra-low breakaway torque requirement, allowing matching with compact, low-stress actuators to reduce mechanical fatigue across the full valve-actuator assembly.
Rigorous endurance validation backs the ball valve’s long service life: every complete OFB ball valve and actuator combination undergoes 100,000 full open-close cycle testing without seal degradation or functional drift, guaranteeing stable low-maintenance operation throughout the entire lifecycle of oil-free cooling equipment.
Industry analysts note that oil-free centrifugal compressor technology is accelerating adoption globally to meet energy efficiency and low-GWP refrigerant targets, creating surging market demand for specialized oil-free ball valves. Traditional general-purpose ball valves lack the sealing precision and flow geometry required for oil-free suction circuits, making the Danfoss OFB ball valve a purpose-built solution filling a critical product gap in the refrigeration component market.
“The OFB ball valve redefines what suction-side flow control can achieve for oil-free systems,” a Danfoss product development lead commented. “We reimagined the standard ball valve design from the ground up to solve two core industry challenges simultaneously: eliminating refrigerant migration risks while preserving maximum flow efficiency. This single ball valve cuts system complexity for OEMs and delivers unrivaled compressor protection for end users operating data centers and high-capacity heat pump plants.”
Key Ball Valve Product Highlights
Core product: OFB tight oil-free shut-off ball valve, part of Danfoss EXO oil-free series
Three-in-one ball valve design: suction flow optimization, tight isolation shut-off, full motorization
Compatible with all Turbocor® TGx / TTx oil-free compressors
12 flange sizes (3”,4”,5”) compliant with ANSI, ASTM, DIN, EN standards
Operating temperature range: -40°C ~ +100°C
MQT brushless actuators, 10-second fast response; 100,000-cycle endurance tested
Primary applications: data center chillers, high-end oil-free heat pumps, industrial HVAC
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