Spirovent VJP125TM Air Eliminators, 1-1/4 in, Press, 150 psi, 270 deg F, Brass

Spirotherm® Spirovent® VJP125TM Press Connection Air Eliminator – Technical Product Information

The Spirotherm® Spirovent® VJP125TM Air Eliminator is a precision-engineered component designed for continuous air separation in closed-loop hydronic heating and cooling systems. Utilizing the patented Spirotube® coalescing medium, this model efficiently extracts entrained air and microbubbles from circulating fluids under low-velocity, low-turbulence conditions. The unit’s solid brass construction, press-fit connections, and integrated automatic air release mechanism make it suitable for both residential and light commercial hydronic applications where long-term reliability and consistent performance are critical.

Technical Specifications

• Model Number: VJP125TM
• Manufacturer: Spirotherm® Inc.
• Series: Spirovent® Junior (VJP Series – Press Fit)
• Product Type: Air Eliminator for Hydronic Systems
• Connection Type: 1-1/4" Press Fit
• Material: Solid Brass Body
• Internal Design: Patented Spirotube® Coalescing Medium
• Flow Configuration: Straight In-Line, Full Flow
• Operating Pressure: 150 PSI (Standard Model)
• Maximum Operating Temperature: 270°F (Standard) / 360°F (HT Model for Solar Applications)
• Installation Orientation: Horizontal (Standard)
• Air Vent Type: Integral Automatic Air Release Assembly
• Applicable Fluids: Water or Water/Glycol Solutions (Closed Hydronic Systems)
• Connection Compatibility: Press-Fit System (Copper/Press Tool-Compatible)
• Applicable Pipe Sizes: Available from 3/4" to 2" (Junior Series)
• Body Finish: Machined Brass, Unplated
• Maintenance: Maintenance-free under normal operation
• Warranty: 20-Year Limited Manufacturer Warranty
• Certifications: Designed and manufactured to meet industry hydronic performance standards

Design and Performance Features

• Employs patented Spirotube® coalescing medium for continuous microbubble and air separation
• Full-flow in-line design ensures minimal pressure loss and unrestricted fluid circulation
• Automatic air release mechanism eliminates the need for manual venting
• Solid brass construction provides mechanical durability and corrosion resistance
• Press-fit connection allows for rapid, reliable installation using industry-standard press tools
• Operates effectively under low velocity and low turbulence conditions
• Reduces noise, cavitation, and corrosion in hydronic systems by maintaining air-free operation
• Optional HT model available for high-temperature solar and thermal applications up to 360°F

Professional Summary

The Spirotherm® Spirovent® VJP125TM 1-1/4" Press Connection Air Eliminator provides hydronic system professionals with a proven, maintenance-free solution for continuous air removal in closed-loop heating and cooling circuits. Featuring the patented Spirotube® coalescing medium and an integral automatic venting assembly, the unit ensures stable system performance, protects components from air-related wear, and enhances heat transfer efficiency. Built from solid brass with press-fit installation compatibility, the VJP125TM combines mechanical integrity, rapid install capability, and long service life, backed by a 20-year manufacturer warranty.